/src/hostap/src/crypto/crypto_openssl.c

Source
/*
 * Wrapper functions for OpenSSL libcrypto
 * Copyright (c) 2004-2024, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"
#include <openssl/opensslv.h>
#include <openssl/err.h>
#include <openssl/des.h>
#include <openssl/aes.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/dh.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#ifdef CONFIG_ECC
#include <openssl/ec.h>
#include <openssl/x509.h>
#endif /* CONFIG_ECC */
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
#include <openssl/provider.h>
#include <openssl/core_names.h>
#include <openssl/param_build.h>
#include <openssl/encoder.h>
#include <openssl/decoder.h>
#else /* OpenSSL version >= 3.0 */
#include <openssl/cmac.h>
#endif /* OpenSSL version >= 3.0 */
#ifdef CONFIG_DPP3
#if OPENSSL_VERSION_NUMBER >= 0x30200000L
#include <openssl/hpke.h>
#endif
#endif /* CONFIG_DPP3 */

#include "common.h"
#include "utils/const_time.h"
#include "wpabuf.h"
#include "dh_group5.h"
#include "sha1.h"
#include "sha256.h"
#include "sha384.h"
#include "sha512.h"
#include "md5.h"
#include "aes_wrap.h"
#include "crypto.h"

#if OPENSSL_VERSION_NUMBER < 0x10100000L
/* Compatibility wrappers for older versions. */

static HMAC_CTX * HMAC_CTX_new(void)
{
  HMAC_CTX *ctx;

  ctx = os_zalloc(sizeof(*ctx));
  if (ctx)
    HMAC_CTX_init(ctx);
  return ctx;
}


static void HMAC_CTX_free(HMAC_CTX *ctx)
{
  if (!ctx)
    return;
  HMAC_CTX_cleanup(ctx);
  bin_clear_free(ctx, sizeof(*ctx));
}


static EVP_MD_CTX * EVP_MD_CTX_new(void)
{
  EVP_MD_CTX *ctx;

  ctx = os_zalloc(sizeof(*ctx));
  if (ctx)
    EVP_MD_CTX_init(ctx);
  return ctx;
}


static void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
{
  if (!ctx)
    return;
  EVP_MD_CTX_cleanup(ctx);
  bin_clear_free(ctx, sizeof(*ctx));
}


#ifdef CONFIG_ECC

static EC_KEY * EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)
{
  if (pkey->type != EVP_PKEY_EC)
    return NULL;
  return pkey->pkey.ec;
}


static int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
{
  sig->r = r;
  sig->s = s;
  return 1;
}


static void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr,
         const BIGNUM **ps)
{
  if (pr)
    *pr = sig->r;
  if (ps)
    *ps = sig->s;
}

#endif /* CONFIG_ECC */

static const unsigned char * ASN1_STRING_get0_data(const ASN1_STRING *x)
{
  return ASN1_STRING_data((ASN1_STRING *) x);
}


static const ASN1_TIME * X509_get0_notBefore(const X509 *x)
{
  return X509_get_notBefore(x);
}


static const ASN1_TIME * X509_get0_notAfter(const X509 *x)
{
  return X509_get_notAfter(x);
}

#endif /* OpenSSL version < 1.1.0 */


#if OPENSSL_VERSION_NUMBER < 0x10101000L || \
  (defined(LIBRESSL_VERSION_NUMBER) && \
   LIBRESSL_VERSION_NUMBER < 0x30400000L)

static int EC_POINT_get_affine_coordinates(const EC_GROUP *group,
             const EC_POINT *point, BIGNUM *x,
             BIGNUM *y, BN_CTX *ctx)
{
  return EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx);
}


static int EC_POINT_set_affine_coordinates(const EC_GROUP *group,
             EC_POINT *point, const BIGNUM *x,
             const BIGNUM *y, BN_CTX *ctx)
{
  return EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx);
}

#endif /* OpenSSL version < 1.1.1 */


#if OPENSSL_VERSION_NUMBER < 0x10101000L || \
  defined(OPENSSL_IS_BORINGSSL) || \
  (defined(LIBRESSL_VERSION_NUMBER) && \
   LIBRESSL_VERSION_NUMBER < 0x30400000L)

static int EC_POINT_set_compressed_coordinates(const EC_GROUP *group,
                 EC_POINT *point, const BIGNUM *x,
                 int y_bit, BN_CTX *ctx)
{
  return EC_POINT_set_compressed_coordinates_GFp(group, point, x, y_bit,
                   ctx);
}


static int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
            BIGNUM *b, BN_CTX *ctx)
{
  return EC_GROUP_get_curve_GFp(group, p, a, b, ctx);
}

#endif /* OpenSSL version < 1.1.1 */


static void openssl_disable_fips(void)
{
#ifndef CONFIG_FIPS
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  static bool done = false;

  if (done)
    return;
  done = true;

  if (!EVP_default_properties_is_fips_enabled(NULL))
    return; /* FIPS mode is not enabled */

  if (!EVP_default_properties_enable_fips(NULL, 0))
    wpa_printf(MSG_INFO,
         "OpenSSL: Failed to disable FIPS mode");
  else
    wpa_printf(MSG_DEBUG,
         "OpenSSL: Disabled FIPS mode to enable non-FIPS-compliant algorithms and parameters");
#endif /* OpenSSL version >= 3.0 */
#endif /* !CONFIG_FIPS */
}

#if OPENSSL_VERSION_NUMBER >= 0x30000000L
static OSSL_PROVIDER *openssl_legacy_provider = NULL;
static OSSL_PROVIDER *openssl_default_provider = NULL;
#endif /* OpenSSL version >= 3.0 */

void openssl_load_legacy_provider(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (openssl_legacy_provider)
    return;

  openssl_legacy_provider = OSSL_PROVIDER_try_load(NULL, "legacy", 1);
#endif /* OpenSSL version >= 3.0 */
}


static void openssl_unload_legacy_provider(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (openssl_legacy_provider) {
    OSSL_PROVIDER_unload(openssl_legacy_provider);
    openssl_legacy_provider = NULL;
  }
#endif /* OpenSSL version >= 3.0 */
}


static void openssl_load_default_provider_if_fips(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (openssl_default_provider)
    return;

  if (!OSSL_PROVIDER_available(NULL, "fips"))
    return;

  wpa_printf(MSG_DEBUG,
       "OpenSSL: Load default provider to replace fips provider when needed");
  openssl_default_provider = OSSL_PROVIDER_try_load(NULL, "default", 1);
  if (!openssl_default_provider)
    wpa_printf(MSG_DEBUG,
         "OpenSSL: Failed to load default provider");
#endif /* OpenSSL version >= 3.0 */
}


static void openssl_unload_default_provider(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (openssl_default_provider) {
    OSSL_PROVIDER_unload(openssl_default_provider);
    openssl_default_provider = NULL;
  }
#endif /* OpenSSL version >= 3.0 */
}


#if OPENSSL_VERSION_NUMBER < 0x30000000L

static BIGNUM * get_group5_prime(void)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
  return BN_get_rfc3526_prime_1536(NULL);
#elif !defined(OPENSSL_IS_BORINGSSL)
  return get_rfc3526_prime_1536(NULL);
#else
  static const unsigned char RFC3526_PRIME_1536[] = {
    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,
    0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,
    0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,0x02,0x0B,0xBE,0xA6,
    0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
    0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,
    0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,
    0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,0xF4,0x4C,0x42,0xE9,
    0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
    0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,
    0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,0xEC,0xE4,0x5B,0x3D,
    0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,0x98,0xDA,0x48,0x36,
    0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,0xFD,0x24,0xCF,0x5F,
    0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,0x1C,0x62,0xF3,0x56,
    0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,0x70,0x96,0x96,0x6D,
    0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,0xF1,0x74,0x6C,0x08,
    0xCA,0x23,0x73,0x27,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  };
        return BN_bin2bn(RFC3526_PRIME_1536, sizeof(RFC3526_PRIME_1536), NULL);
#endif
}


static BIGNUM * get_group5_order(void)
{
  static const unsigned char RFC3526_ORDER_1536[] = {
    0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xE4,0x87,0xED,0x51,
    0x10,0xB4,0x61,0x1A,0x62,0x63,0x31,0x45,0xC0,0x6E,0x0E,0x68,
    0x94,0x81,0x27,0x04,0x45,0x33,0xE6,0x3A,0x01,0x05,0xDF,0x53,
    0x1D,0x89,0xCD,0x91,0x28,0xA5,0x04,0x3C,0xC7,0x1A,0x02,0x6E,
    0xF7,0xCA,0x8C,0xD9,0xE6,0x9D,0x21,0x8D,0x98,0x15,0x85,0x36,
    0xF9,0x2F,0x8A,0x1B,0xA7,0xF0,0x9A,0xB6,0xB6,0xA8,0xE1,0x22,
    0xF2,0x42,0xDA,0xBB,0x31,0x2F,0x3F,0x63,0x7A,0x26,0x21,0x74,
    0xD3,0x1B,0xF6,0xB5,0x85,0xFF,0xAE,0x5B,0x7A,0x03,0x5B,0xF6,
    0xF7,0x1C,0x35,0xFD,0xAD,0x44,0xCF,0xD2,0xD7,0x4F,0x92,0x08,
    0xBE,0x25,0x8F,0xF3,0x24,0x94,0x33,0x28,0xF6,0x72,0x2D,0x9E,
    0xE1,0x00,0x3E,0x5C,0x50,0xB1,0xDF,0x82,0xCC,0x6D,0x24,0x1B,
    0x0E,0x2A,0xE9,0xCD,0x34,0x8B,0x1F,0xD4,0x7E,0x92,0x67,0xAF,
    0xC1,0xB2,0xAE,0x91,0xEE,0x51,0xD6,0xCB,0x0E,0x31,0x79,0xAB,
    0x10,0x42,0xA9,0x5D,0xCF,0x6A,0x94,0x83,0xB8,0x4B,0x4B,0x36,
    0xB3,0x86,0x1A,0xA7,0x25,0x5E,0x4C,0x02,0x78,0xBA,0x36,0x04,
    0x65,0x11,0xB9,0x93,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
  };
  return BN_bin2bn(RFC3526_ORDER_1536, sizeof(RFC3526_ORDER_1536), NULL);
}

#endif /* OpenSSL version < 3.0 */


#ifdef OPENSSL_NO_SHA256
#define NO_SHA256_WRAPPER
#endif
#ifdef OPENSSL_NO_SHA512
#define NO_SHA384_WRAPPER
#endif

static int openssl_digest_vector(const EVP_MD *type, size_t num_elem,
         const u8 *addr[], const size_t *len, u8 *mac)
{
  EVP_MD_CTX *ctx;
  size_t i;
  unsigned int mac_len;

  if (TEST_FAIL())
    return -1;

  ctx = EVP_MD_CTX_new();
  if (!ctx)
    return -1;
  if (!EVP_DigestInit_ex(ctx, type, NULL)) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestInit_ex failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    EVP_MD_CTX_free(ctx);
    return -1;
  }
  for (i = 0; i < num_elem; i++) {
    if (!EVP_DigestUpdate(ctx, addr[i], len[i])) {
      wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestUpdate "
           "failed: %s",
           ERR_error_string(ERR_get_error(), NULL));
      EVP_MD_CTX_free(ctx);
      return -1;
    }
  }
  if (!EVP_DigestFinal(ctx, mac, &mac_len)) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_DigestFinal failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    EVP_MD_CTX_free(ctx);
    return -1;
  }
  EVP_MD_CTX_free(ctx);

  return 0;
}


#ifndef CONFIG_FIPS

static void openssl_need_md5(void)
{
  openssl_disable_fips();
  openssl_load_default_provider_if_fips();
}


int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
  openssl_disable_fips();
  openssl_load_legacy_provider();
  return openssl_digest_vector(EVP_md4(), num_elem, addr, len, mac);
}


int des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
{
  u8 pkey[8], next, tmp;
  int i, plen, ret = -1;
  EVP_CIPHER_CTX *ctx;

  openssl_load_legacy_provider();

  /* Add parity bits to the key */
  next = 0;
  for (i = 0; i < 7; i++) {
    tmp = key[i];
    pkey[i] = (tmp >> i) | next | 1;
    next = tmp << (7 - i);
  }
  pkey[i] = next | 1;

  ctx = EVP_CIPHER_CTX_new();
  if (ctx &&
      EVP_EncryptInit_ex(ctx, EVP_des_ecb(), NULL, pkey, NULL) == 1 &&
      EVP_CIPHER_CTX_set_padding(ctx, 0) == 1 &&
      EVP_EncryptUpdate(ctx, cypher, &plen, clear, 8) == 1 &&
      EVP_EncryptFinal_ex(ctx, &cypher[plen], &plen) == 1)
    ret = 0;
  else
    wpa_printf(MSG_ERROR, "OpenSSL: DES encrypt failed");

  if (ctx)
    EVP_CIPHER_CTX_free(ctx);
  return ret;
}


#ifndef CONFIG_NO_RC4
int rc4_skip(const u8 *key, size_t keylen, size_t skip,
       u8 *data, size_t data_len)
{
#ifdef OPENSSL_NO_RC4
  return -1;
#else /* OPENSSL_NO_RC4 */
  EVP_CIPHER_CTX *ctx;
  int outl;
  int res = -1;
  unsigned char skip_buf[16] = { 0 };

  openssl_load_legacy_provider();

  ctx = EVP_CIPHER_CTX_new();
  if (!ctx ||
      !EVP_CipherInit_ex(ctx, EVP_rc4(), NULL, NULL, NULL, 1) ||
      !EVP_CIPHER_CTX_set_padding(ctx, 0) ||
      !EVP_CIPHER_CTX_set_key_length(ctx, keylen) ||
      !EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, 1))
    goto out;

  while (skip >= sizeof(skip_buf)) {
    size_t len = skip;
    if (len > sizeof(skip_buf))
      len = sizeof(skip_buf);
    if (!EVP_CipherUpdate(ctx, skip_buf, &outl, skip_buf, len))
      goto out;
    skip -= len;
  }

  if (EVP_CipherUpdate(ctx, data, &outl, data, data_len))
    res = 0;

out:
  if (ctx)
    EVP_CIPHER_CTX_free(ctx);
  return res;
#endif /* OPENSSL_NO_RC4 */
}
#endif /* CONFIG_NO_RC4 */


int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
  openssl_need_md5();
  return openssl_digest_vector(EVP_md5(), num_elem, addr, len, mac);
}

#endif /* CONFIG_FIPS */


int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_digest_vector(EVP_sha1(), num_elem, addr, len, mac);
}


#ifndef NO_SHA256_WRAPPER
int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
      u8 *mac)
{
  return openssl_digest_vector(EVP_sha256(), num_elem, addr, len, mac);
}
#endif /* NO_SHA256_WRAPPER */


#ifndef NO_SHA384_WRAPPER
int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
      u8 *mac)
{
  return openssl_digest_vector(EVP_sha384(), num_elem, addr, len, mac);
}
#endif /* NO_SHA384_WRAPPER */


#ifndef NO_SHA512_WRAPPER
int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len,
      u8 *mac)
{
  return openssl_digest_vector(EVP_sha512(), num_elem, addr, len, mac);
}
#endif /* NO_SHA512_WRAPPER */


static const EVP_CIPHER * aes_get_evp_cipher(size_t keylen)
{
  switch (keylen) {
  case 16:
    return EVP_aes_128_ecb();
  case 24:
    return EVP_aes_192_ecb();
  case 32:
    return EVP_aes_256_ecb();
  default:
    return NULL;
  }
}


void * aes_encrypt_init(const u8 *key, size_t len)
{
  EVP_CIPHER_CTX *ctx;
  const EVP_CIPHER *type;

  if (TEST_FAIL())
    return NULL;

  type = aes_get_evp_cipher(len);
  if (!type) {
    wpa_printf(MSG_INFO, "%s: Unsupported len=%u",
         __func__, (unsigned int) len);
    return NULL;
  }

  ctx = EVP_CIPHER_CTX_new();
  if (ctx == NULL)
    return NULL;
  if (EVP_EncryptInit_ex(ctx, type, NULL, key, NULL) != 1 ||
      EVP_CIPHER_CTX_set_padding(ctx, 0) != 1) {
    EVP_CIPHER_CTX_free(ctx);
    return NULL;
  }
  return ctx;
}


int aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
  EVP_CIPHER_CTX *c = ctx;
  int clen = 16;
  if (EVP_EncryptUpdate(c, crypt, &clen, plain, 16) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptUpdate failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    return -1;
  }
  return 0;
}


void aes_encrypt_deinit(void *ctx)
{
  EVP_CIPHER_CTX *c = ctx;
  u8 buf[16];
  int len = sizeof(buf);
  if (EVP_EncryptFinal_ex(c, buf, &len) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptFinal_ex failed: "
         "%s", ERR_error_string(ERR_get_error(), NULL));
  }
  if (len != 0) {
    wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
         "in AES encrypt", len);
  }
  EVP_CIPHER_CTX_free(c);
}


void * aes_decrypt_init(const u8 *key, size_t len)
{
  EVP_CIPHER_CTX *ctx;
  const EVP_CIPHER *type;

  if (TEST_FAIL())
    return NULL;

  type = aes_get_evp_cipher(len);
  if (!type) {
    wpa_printf(MSG_INFO, "%s: Unsupported len=%u",
         __func__, (unsigned int) len);
    return NULL;
  }

  ctx = EVP_CIPHER_CTX_new();
  if (ctx == NULL)
    return NULL;
  if (EVP_DecryptInit_ex(ctx, type, NULL, key, NULL) != 1 ||
      EVP_CIPHER_CTX_set_padding(ctx, 0) != 1) {
    EVP_CIPHER_CTX_free(ctx);
    return NULL;
  }
  return ctx;
}


int aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
  EVP_CIPHER_CTX *c = ctx;
  int plen = 16;
  if (EVP_DecryptUpdate(c, plain, &plen, crypt, 16) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptUpdate failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    return -1;
  }
  return 0;
}


void aes_decrypt_deinit(void *ctx)
{
  EVP_CIPHER_CTX *c = ctx;
  u8 buf[16];
  int len = sizeof(buf);
  if (EVP_DecryptFinal_ex(c, buf, &len) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptFinal_ex failed: "
         "%s", ERR_error_string(ERR_get_error(), NULL));
  }
  if (len != 0) {
    wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
         "in AES decrypt", len);
  }
  EVP_CIPHER_CTX_free(c);
}


#ifndef CONFIG_FIPS
#ifndef CONFIG_OPENSSL_INTERNAL_AES_WRAP

#if OPENSSL_VERSION_NUMBER >= 0x30000000L
static const EVP_CIPHER * aes_get_evp_wrap_cipher(size_t keylen)
{
  switch (keylen) {
  case 16:
    return EVP_aes_128_wrap();
  case 24:
    return EVP_aes_192_wrap();
  case 32:
    return EVP_aes_256_wrap();
  default:
    return NULL;
  }
}
#endif /* OpenSSL version >= 3.0 */


int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_CIPHER_CTX *ctx;
  const EVP_CIPHER *type;
  int ret = -1, len;
  u8 buf[16];

  if (TEST_FAIL())
    return -1;

  type = aes_get_evp_wrap_cipher(kek_len);
  if (!type)
    return -1;

  ctx = EVP_CIPHER_CTX_new();
  if (!ctx)
    return -1;

  if (EVP_EncryptInit_ex(ctx, type, NULL, kek, NULL) == 1 &&
      EVP_CIPHER_CTX_set_padding(ctx, 0) == 1 &&
      EVP_EncryptUpdate(ctx, cipher, &len, plain, n * 8) == 1 &&
      len == (n + 1) * 8 &&
      EVP_EncryptFinal_ex(ctx, buf, &len) == 1)
    ret = 0;

  EVP_CIPHER_CTX_free(ctx);
  return ret;
#else /* OpenSSL version >= 3.0 */
  AES_KEY actx;
  int res;

  if (TEST_FAIL())
    return -1;
  if (AES_set_encrypt_key(kek, kek_len << 3, &actx))
    return -1;
  res = AES_wrap_key(&actx, NULL, cipher, plain, n * 8);
  OPENSSL_cleanse(&actx, sizeof(actx));
  return res <= 0 ? -1 : 0;
#endif /* OpenSSL version >= 3.0 */
}


int aes_unwrap(const u8 *kek, size_t kek_len, int n, const u8 *cipher,
         u8 *plain)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_CIPHER_CTX *ctx;
  const EVP_CIPHER *type;
  int ret = -1, len;
  u8 buf[16];

  if (TEST_FAIL())
    return -1;

  type = aes_get_evp_wrap_cipher(kek_len);
  if (!type)
    return -1;

  ctx = EVP_CIPHER_CTX_new();
  if (!ctx)
    return -1;

  if (EVP_DecryptInit_ex(ctx, type, NULL, kek, NULL) == 1 &&
      EVP_CIPHER_CTX_set_padding(ctx, 0) == 1 &&
      EVP_DecryptUpdate(ctx, plain, &len, cipher, (n + 1) * 8) == 1 &&
      len == n * 8 &&
      EVP_DecryptFinal_ex(ctx, buf, &len) == 1)
    ret = 0;

  EVP_CIPHER_CTX_free(ctx);
  return ret;
#else /* OpenSSL version >= 3.0 */
  AES_KEY actx;
  int res;

  if (TEST_FAIL())
    return -1;
  if (AES_set_decrypt_key(kek, kek_len << 3, &actx))
    return -1;
  res = AES_unwrap_key(&actx, NULL, plain, cipher, (n + 1) * 8);
  OPENSSL_cleanse(&actx, sizeof(actx));
  return res <= 0 ? -1 : 0;
#endif /* OpenSSL version >= 3.0 */
}

#endif /* CONFIG_OPENSSL_INTERNAL_AES_WRAP */
#endif /* CONFIG_FIPS */


int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
{
  EVP_CIPHER_CTX *ctx;
  int clen, len;
  u8 buf[16];
  int res = -1;

  if (TEST_FAIL())
    return -1;

  ctx = EVP_CIPHER_CTX_new();
  if (!ctx)
    return -1;
  clen = data_len;
  len = sizeof(buf);
  if (EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv) == 1 &&
      EVP_CIPHER_CTX_set_padding(ctx, 0) == 1 &&
      EVP_EncryptUpdate(ctx, data, &clen, data, data_len) == 1 &&
      clen == (int) data_len &&
      EVP_EncryptFinal_ex(ctx, buf, &len) == 1 && len == 0)
    res = 0;
  EVP_CIPHER_CTX_free(ctx);

  return res;
}


int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
{
  EVP_CIPHER_CTX *ctx;
  int plen, len;
  u8 buf[16];
  int res = -1;

  if (TEST_FAIL())
    return -1;

  ctx = EVP_CIPHER_CTX_new();
  if (!ctx)
    return -1;
  plen = data_len;
  len = sizeof(buf);
  if (EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv) == 1 &&
      EVP_CIPHER_CTX_set_padding(ctx, 0) == 1 &&
      EVP_DecryptUpdate(ctx, data, &plen, data, data_len) == 1 &&
      plen == (int) data_len &&
      EVP_DecryptFinal_ex(ctx, buf, &len) == 1 && len == 0)
    res = 0;
  EVP_CIPHER_CTX_free(ctx);

  return res;

}


int crypto_dh_init(u8 generator, const u8 *prime, size_t prime_len, u8 *privkey,
       u8 *pubkey)
{
  size_t pubkey_len, pad;

  if (os_get_random(privkey, prime_len) < 0)
    return -1;
  if (os_memcmp(privkey, prime, prime_len) > 0) {
    /* Make sure private value is smaller than prime */
    privkey[0] = 0;
  }

  pubkey_len = prime_len;
  if (crypto_mod_exp(&generator, 1, privkey, prime_len, prime, prime_len,
         pubkey, &pubkey_len) < 0)
    return -1;
  if (pubkey_len < prime_len) {
    pad = prime_len - pubkey_len;
    os_memmove(pubkey + pad, pubkey, pubkey_len);
    os_memset(pubkey, 0, pad);
  }

  return 0;
}


int crypto_dh_derive_secret(u8 generator, const u8 *prime, size_t prime_len,
          const u8 *order, size_t order_len,
          const u8 *privkey, size_t privkey_len,
          const u8 *pubkey, size_t pubkey_len,
          u8 *secret, size_t *len)
{
  BIGNUM *pub, *p;
  int res = -1;

  pub = BN_bin2bn(pubkey, pubkey_len, NULL);
  p = BN_bin2bn(prime, prime_len, NULL);
  if (!pub || !p || BN_is_zero(pub) || BN_is_one(pub) ||
      BN_cmp(pub, p) >= 0)
    goto fail;

  if (order) {
    BN_CTX *ctx;
    BIGNUM *q, *tmp;
    int failed;

    /* verify: pubkey^q == 1 mod p */
    q = BN_bin2bn(order, order_len, NULL);
    ctx = BN_CTX_new();
    tmp = BN_new();
    failed = !q || !ctx || !tmp ||
      !BN_mod_exp(tmp, pub, q, p, ctx) ||
      !BN_is_one(tmp);
    BN_clear_free(q);
    BN_clear_free(tmp);
    BN_CTX_free(ctx);
    if (failed)
      goto fail;
  }

  res = crypto_mod_exp(pubkey, pubkey_len, privkey, privkey_len,
           prime, prime_len, secret, len);
fail:
  BN_clear_free(pub);
  BN_clear_free(p);
  return res;
}


int crypto_mod_exp(const u8 *base, size_t base_len,
       const u8 *power, size_t power_len,
       const u8 *modulus, size_t modulus_len,
       u8 *result, size_t *result_len)
{
  BIGNUM *bn_base, *bn_exp, *bn_modulus, *bn_result;
  int ret = -1;
  BN_CTX *ctx;

  ctx = BN_CTX_new();
  if (ctx == NULL)
    return -1;

  bn_base = BN_bin2bn(base, base_len, NULL);
  bn_exp = BN_bin2bn(power, power_len, NULL);
  bn_modulus = BN_bin2bn(modulus, modulus_len, NULL);
  bn_result = BN_new();

  if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
      bn_result == NULL)
    goto error;

  if (BN_mod_exp_mont_consttime(bn_result, bn_base, bn_exp, bn_modulus,
              ctx, NULL) != 1)
    goto error;

  *result_len = BN_bn2bin(bn_result, result);
  ret = 0;

error:
  BN_clear_free(bn_base);
  BN_clear_free(bn_exp);
  BN_clear_free(bn_modulus);
  BN_clear_free(bn_result);
  BN_CTX_free(ctx);
  return ret;
}


struct crypto_cipher {
  EVP_CIPHER_CTX *enc;
  EVP_CIPHER_CTX *dec;
};


struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
            const u8 *iv, const u8 *key,
            size_t key_len)
{
  struct crypto_cipher *ctx;
  const EVP_CIPHER *cipher;

  ctx = os_zalloc(sizeof(*ctx));
  if (ctx == NULL)
    return NULL;

  switch (alg) {
#ifndef CONFIG_NO_RC4
#ifndef OPENSSL_NO_RC4
  case CRYPTO_CIPHER_ALG_RC4:
    cipher = EVP_rc4();
    break;
#endif /* OPENSSL_NO_RC4 */
#endif /* CONFIG_NO_RC4 */
#ifndef OPENSSL_NO_AES
  case CRYPTO_CIPHER_ALG_AES:
    switch (key_len) {
    case 16:
      cipher = EVP_aes_128_cbc();
      break;
#ifndef OPENSSL_IS_BORINGSSL
    case 24:
      cipher = EVP_aes_192_cbc();
      break;
#endif /* OPENSSL_IS_BORINGSSL */
    case 32:
      cipher = EVP_aes_256_cbc();
      break;
    default:
      os_free(ctx);
      return NULL;
    }
    break;
#endif /* OPENSSL_NO_AES */
#ifndef OPENSSL_NO_DES
  case CRYPTO_CIPHER_ALG_3DES:
    cipher = EVP_des_ede3_cbc();
    break;
  case CRYPTO_CIPHER_ALG_DES:
    cipher = EVP_des_cbc();
    break;
#endif /* OPENSSL_NO_DES */
#ifndef OPENSSL_NO_NULL
  case CRYPTO_CIPHER_NULL:
    cipher = EVP_enc_null();
    break;
#endif /* OPENSSL_NO_NULL */
  default:
    os_free(ctx);
    return NULL;
  }

  if (!(ctx->enc = EVP_CIPHER_CTX_new()) ||
      !EVP_EncryptInit_ex(ctx->enc, cipher, NULL, NULL, NULL) ||
      !EVP_CIPHER_CTX_set_padding(ctx->enc, 0) ||
      !EVP_CIPHER_CTX_set_key_length(ctx->enc, key_len) ||
      !EVP_EncryptInit_ex(ctx->enc, NULL, NULL, key, iv)) {
    if (ctx->enc)
      EVP_CIPHER_CTX_free(ctx->enc);
    os_free(ctx);
    return NULL;
  }

  if (!(ctx->dec = EVP_CIPHER_CTX_new()) ||
      !EVP_DecryptInit_ex(ctx->dec, cipher, NULL, NULL, NULL) ||
      !EVP_CIPHER_CTX_set_padding(ctx->dec, 0) ||
      !EVP_CIPHER_CTX_set_key_length(ctx->dec, key_len) ||
      !EVP_DecryptInit_ex(ctx->dec, NULL, NULL, key, iv)) {
    EVP_CIPHER_CTX_free(ctx->enc);
    if (ctx->dec)
      EVP_CIPHER_CTX_free(ctx->dec);
    os_free(ctx);
    return NULL;
  }

  return ctx;
}


int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
        u8 *crypt, size_t len)
{
  int outl;
  if (!EVP_EncryptUpdate(ctx->enc, crypt, &outl, plain, len))
    return -1;
  return 0;
}


int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
        u8 *plain, size_t len)
{
  int outl;
  outl = len;
  if (!EVP_DecryptUpdate(ctx->dec, plain, &outl, crypt, len))
    return -1;
  return 0;
}


void crypto_cipher_deinit(struct crypto_cipher *ctx)
{
  EVP_CIPHER_CTX_free(ctx->enc);
  EVP_CIPHER_CTX_free(ctx->dec);
  os_free(ctx);
}


void * dh5_init(struct wpabuf **priv, struct wpabuf **publ)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L
  DH *dh;
  struct wpabuf *pubkey = NULL, *privkey = NULL;
  size_t publen, privlen;

  *priv = NULL;
  wpabuf_free(*publ);
  *publ = NULL;

  dh = DH_new();
  if (dh == NULL)
    return NULL;

  dh->g = BN_new();
  if (dh->g == NULL || BN_set_word(dh->g, 2) != 1)
    goto err;

  dh->p = get_group5_prime();
  if (dh->p == NULL)
    goto err;

  dh->q = get_group5_order();
  if (!dh->q)
    goto err;

  if (DH_generate_key(dh) != 1)
    goto err;

  publen = BN_num_bytes(dh->pub_key);
  pubkey = wpabuf_alloc(publen);
  if (pubkey == NULL)
    goto err;
  privlen = BN_num_bytes(dh->priv_key);
  privkey = wpabuf_alloc(privlen);
  if (privkey == NULL)
    goto err;

  BN_bn2bin(dh->pub_key, wpabuf_put(pubkey, publen));
  BN_bn2bin(dh->priv_key, wpabuf_put(privkey, privlen));

  *priv = privkey;
  *publ = pubkey;
  return dh;

err:
  wpabuf_clear_free(pubkey);
  wpabuf_clear_free(privkey);
  DH_free(dh);
  return NULL;
#elif OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *pkey = NULL;
  OSSL_PARAM params[2];
  size_t pub_len = OSSL_PARAM_UNMODIFIED;
  size_t priv_len;
  struct wpabuf *pubkey = NULL, *privkey = NULL;
  BIGNUM *priv_bn = NULL;
  EVP_PKEY_CTX *gctx;
  const char *propquery = NULL;

  *priv = NULL;
  wpabuf_free(*publ);
  *publ = NULL;

  if (OSSL_PROVIDER_available(NULL, "fips")) {
    openssl_disable_fips();
    openssl_load_default_provider_if_fips();
    propquery = "provider!=fips";
  }

  params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                 "modp_1536", 0);
  params[1] = OSSL_PARAM_construct_end();

  gctx = EVP_PKEY_CTX_new_from_name(NULL, "DH", propquery);
  if (!gctx ||
      EVP_PKEY_keygen_init(gctx) != 1 ||
      EVP_PKEY_CTX_set_params(gctx, params) != 1 ||
      EVP_PKEY_generate(gctx, &pkey) != 1 ||
      EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PRIV_KEY,
          &priv_bn) != 1 ||
      EVP_PKEY_get_octet_string_param(pkey,
              OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY,
              NULL, 0, &pub_len) < 0 ||
      pub_len == OSSL_PARAM_UNMODIFIED ||
      (priv_len = BN_num_bytes(priv_bn)) == 0 ||
      !(pubkey = wpabuf_alloc(pub_len)) ||
      !(privkey = wpabuf_alloc(priv_len)) ||
      EVP_PKEY_get_octet_string_param(pkey,
              OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY,
              wpabuf_put(pubkey, pub_len),
              pub_len, NULL) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    wpabuf_free(pubkey);
    wpabuf_clear_free(privkey);
    EVP_PKEY_free(pkey);
    pkey = NULL;
  } else {
    BN_bn2bin(priv_bn, wpabuf_put(privkey, priv_len));

    *priv = privkey;
    *publ = pubkey;
  }

  BN_clear_free(priv_bn);
  EVP_PKEY_CTX_free(gctx);
  return pkey;
#else
  DH *dh;
  struct wpabuf *pubkey = NULL, *privkey = NULL;
  size_t publen, privlen;
  BIGNUM *p, *g, *q;
  const BIGNUM *priv_key = NULL, *pub_key = NULL;

  *priv = NULL;
  wpabuf_free(*publ);
  *publ = NULL;

  dh = DH_new();
  if (dh == NULL)
    return NULL;

  g = BN_new();
  p = get_group5_prime();
  q = get_group5_order();
  if (!g || BN_set_word(g, 2) != 1 || !p || !q ||
      DH_set0_pqg(dh, p, q, g) != 1)
    goto err;
  p = NULL;
  q = NULL;
  g = NULL;

  if (DH_generate_key(dh) != 1)
    goto err;

  DH_get0_key(dh, &pub_key, &priv_key);
  publen = BN_num_bytes(pub_key);
  pubkey = wpabuf_alloc(publen);
  if (!pubkey)
    goto err;
  privlen = BN_num_bytes(priv_key);
  privkey = wpabuf_alloc(privlen);
  if (!privkey)
    goto err;

  BN_bn2bin(pub_key, wpabuf_put(pubkey, publen));
  BN_bn2bin(priv_key, wpabuf_put(privkey, privlen));

  *priv = privkey;
  *publ = pubkey;
  return dh;

err:
  BN_free(p);
  BN_free(q);
  BN_free(g);
  wpabuf_clear_free(pubkey);
  wpabuf_clear_free(privkey);
  DH_free(dh);
  return NULL;
#endif
}


void * dh5_init_fixed(const struct wpabuf *priv, const struct wpabuf *publ)
{
#if OPENSSL_VERSION_NUMBER < 0x10100000L
  DH *dh;

  dh = DH_new();
  if (dh == NULL)
    return NULL;

  dh->g = BN_new();
  if (dh->g == NULL || BN_set_word(dh->g, 2) != 1)
    goto err;

  dh->p = get_group5_prime();
  if (dh->p == NULL)
    goto err;

  dh->priv_key = BN_bin2bn(wpabuf_head(priv), wpabuf_len(priv), NULL);
  if (dh->priv_key == NULL)
    goto err;

  dh->pub_key = BN_bin2bn(wpabuf_head(publ), wpabuf_len(publ), NULL);
  if (dh->pub_key == NULL)
    goto err;

  if (DH_generate_key(dh) != 1)
    goto err;

  return dh;

err:
  DH_free(dh);
  return NULL;
#elif OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *pkey = NULL;
  OSSL_PARAM_BLD *bld;
  OSSL_PARAM *params = NULL;
  BIGNUM *priv_key, *pub_key;
  EVP_PKEY_CTX *fctx;

  fctx = EVP_PKEY_CTX_new_from_name(NULL, "DH", NULL);
  priv_key = BN_bin2bn(wpabuf_head(priv), wpabuf_len(priv), NULL);
  pub_key = BN_bin2bn(wpabuf_head(publ), wpabuf_len(publ), NULL);
  bld = OSSL_PARAM_BLD_new();
  if (!fctx || !priv_key || !pub_key || !bld ||
      OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_GROUP_NAME,
              "modp_1536", 0) != 1 ||
      OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PRIV_KEY,
           priv_key) != 1 ||
      OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_PUB_KEY,
           pub_key) != 1 ||
      !(params = OSSL_PARAM_BLD_to_param(bld)) ||
      EVP_PKEY_fromdata_init(fctx) != 1 ||
      EVP_PKEY_fromdata(fctx, &pkey, EVP_PKEY_KEYPAIR, params) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: EVP_PKEY_fromdata failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    EVP_PKEY_free(pkey);
    pkey = NULL;
  }

  BN_clear_free(priv_key);
  BN_free(pub_key);
  EVP_PKEY_CTX_free(fctx);
  OSSL_PARAM_BLD_free(bld);
  OSSL_PARAM_free(params);
  return pkey;
#else
  DH *dh;
  BIGNUM *p = NULL, *g, *priv_key = NULL, *pub_key = NULL;

  dh = DH_new();
  if (dh == NULL)
    return NULL;

  g = BN_new();
  p = get_group5_prime();
  if (!g || BN_set_word(g, 2) != 1 || !p ||
      DH_set0_pqg(dh, p, NULL, g) != 1)
    goto err;
  p = NULL;
  g = NULL;

  priv_key = BN_bin2bn(wpabuf_head(priv), wpabuf_len(priv), NULL);
  pub_key = BN_bin2bn(wpabuf_head(publ), wpabuf_len(publ), NULL);
  if (!priv_key || !pub_key || DH_set0_key(dh, pub_key, priv_key) != 1)
    goto err;
  pub_key = NULL;
  priv_key = NULL;

  if (DH_generate_key(dh) != 1)
    goto err;

  return dh;

err:
  BN_free(p);
  BN_free(g);
  BN_free(pub_key);
  BN_clear_free(priv_key);
  DH_free(dh);
  return NULL;
#endif
}


struct wpabuf * dh5_derive_shared(void *ctx, const struct wpabuf *peer_public,
          const struct wpabuf *own_private)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *pkey = ctx;
  EVP_PKEY *peer_pub;
  size_t len;
  struct wpabuf *res = NULL;
  EVP_PKEY_CTX *dctx = NULL;

  peer_pub = EVP_PKEY_new();
  if (!pkey || !peer_pub ||
      EVP_PKEY_copy_parameters(peer_pub, pkey) != 1 ||
      EVP_PKEY_set1_encoded_public_key(peer_pub, wpabuf_head(peer_public),
               wpabuf_len(peer_public)) != 1 ||
      !(dctx = EVP_PKEY_CTX_new(pkey, NULL)) ||
      EVP_PKEY_derive_init(dctx) != 1 ||
      EVP_PKEY_derive_set_peer(dctx, peer_pub) != 1 ||
      EVP_PKEY_derive(dctx, NULL, &len) != 1 ||
      !(res = wpabuf_alloc(len)) ||
      EVP_PKEY_derive(dctx, wpabuf_mhead(res), &len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: EVP_PKEY_derive failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    wpabuf_free(res);
    res = NULL;
  } else {
    wpabuf_put(res, len);
  }

  EVP_PKEY_free(peer_pub);
  EVP_PKEY_CTX_free(dctx);
  return res;
#else /* OpenSSL version >= 3.0 */
  BIGNUM *pub_key;
  struct wpabuf *res = NULL;
  size_t rlen;
  DH *dh = ctx;
  int keylen;

  if (ctx == NULL)
    return NULL;

  pub_key = BN_bin2bn(wpabuf_head(peer_public), wpabuf_len(peer_public),
          NULL);
  if (pub_key == NULL)
    return NULL;

  rlen = DH_size(dh);
  res = wpabuf_alloc(rlen);
  if (res == NULL)
    goto err;

  keylen = DH_compute_key(wpabuf_mhead(res), pub_key, dh);
  if (keylen < 0)
    goto err;
  wpabuf_put(res, keylen);
  BN_clear_free(pub_key);

  return res;

err:
  BN_clear_free(pub_key);
  wpabuf_clear_free(res);
  return NULL;
#endif /* OpenSSL version >= 3.0 */
}


void dh5_free(void *ctx)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *pkey = ctx;

  EVP_PKEY_free(pkey);
#else /* OpenSSL version >= 3.0 */
  DH *dh;
  if (ctx == NULL)
    return;
  dh = ctx;
  DH_free(dh);
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_hash {
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_MAC_CTX *ctx;
#else /* OpenSSL version >= 3.0 */
  HMAC_CTX *ctx;
#endif /* OpenSSL version >= 3.0 */
  bool failed;
};


struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
              size_t key_len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  struct crypto_hash *ctx;
  EVP_MAC *mac;
  OSSL_PARAM params[2];
  char *a = NULL;

  switch (alg) {
#ifndef OPENSSL_NO_MD5
  case CRYPTO_HASH_ALG_HMAC_MD5:
    a = "MD5";
    break;
#endif /* OPENSSL_NO_MD5 */
#ifndef OPENSSL_NO_SHA
  case CRYPTO_HASH_ALG_HMAC_SHA1:
    a = "SHA1";
    break;
#endif /* OPENSSL_NO_SHA */
#ifndef OPENSSL_NO_SHA256
#ifdef CONFIG_SHA256
  case CRYPTO_HASH_ALG_HMAC_SHA256:
    a = "SHA256";
    break;
#endif /* CONFIG_SHA256 */
#endif /* OPENSSL_NO_SHA256 */
  default:
    return NULL;
  }

  mac = EVP_MAC_fetch(NULL, "HMAC", NULL);
  if (!mac)
    return NULL;

  params[0] = OSSL_PARAM_construct_utf8_string("digest", a, 0);
  params[1] = OSSL_PARAM_construct_end();

  ctx = os_zalloc(sizeof(*ctx));
  if (!ctx)
    goto fail;
  ctx->ctx = EVP_MAC_CTX_new(mac);
  if (!ctx->ctx) {
    os_free(ctx);
    ctx = NULL;
    goto fail;
  }

  if (EVP_MAC_init(ctx->ctx, key, key_len, params) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: EVP_MAC_init(hmac,digest=%s) failed: %s",
         a, ERR_error_string(ERR_get_error(), NULL));
    EVP_MAC_CTX_free(ctx->ctx);
    bin_clear_free(ctx, sizeof(*ctx));
    ctx = NULL;
    goto fail;
  }

fail:
  EVP_MAC_free(mac);
  return ctx;
#else /* OpenSSL version >= 3.0 */
  struct crypto_hash *ctx;
  const EVP_MD *md;

  switch (alg) {
#ifndef OPENSSL_NO_MD5
  case CRYPTO_HASH_ALG_HMAC_MD5:
    md = EVP_md5();
    break;
#endif /* OPENSSL_NO_MD5 */
#ifndef OPENSSL_NO_SHA
  case CRYPTO_HASH_ALG_HMAC_SHA1:
    md = EVP_sha1();
    break;
#endif /* OPENSSL_NO_SHA */
#ifndef OPENSSL_NO_SHA256
#ifdef CONFIG_SHA256
  case CRYPTO_HASH_ALG_HMAC_SHA256:
    md = EVP_sha256();
    break;
#endif /* CONFIG_SHA256 */
#endif /* OPENSSL_NO_SHA256 */
  default:
    return NULL;
  }

  ctx = os_zalloc(sizeof(*ctx));
  if (ctx == NULL)
    return NULL;
  ctx->ctx = HMAC_CTX_new();
  if (!ctx->ctx) {
    os_free(ctx);
    return NULL;
  }

  if (HMAC_Init_ex(ctx->ctx, key, key_len, md, NULL) != 1) {
    HMAC_CTX_free(ctx->ctx);
    bin_clear_free(ctx, sizeof(*ctx));
    return NULL;
  }

  return ctx;
#endif /* OpenSSL version >= 3.0 */
}


void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
{
  if (ctx == NULL)
    return;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (!EVP_MAC_update(ctx->ctx, data, len))
    ctx->failed = true;
#else /* OpenSSL version >= 3.0 */
  if (!HMAC_Update(ctx->ctx, data, len))
    ctx->failed = true;
#endif /* OpenSSL version >= 3.0 */
}


int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  size_t mdlen;
  int res;
  bool failed;

  if (!ctx)
    return -2;

  if (!mac || !len) {
    EVP_MAC_CTX_free(ctx->ctx);
    bin_clear_free(ctx, sizeof(*ctx));
    return 0;
  }

  res = EVP_MAC_final(ctx->ctx, NULL, &mdlen, 0);
  if (res != 1) {
    EVP_MAC_CTX_free(ctx->ctx);
    bin_clear_free(ctx, sizeof(*ctx));
    return -1;
  }
  res = EVP_MAC_final(ctx->ctx, mac, &mdlen, mdlen);
  EVP_MAC_CTX_free(ctx->ctx);
  failed = ctx->failed;
  bin_clear_free(ctx, sizeof(*ctx));

  if (TEST_FAIL())
    return -1;

  if (failed)
    return -2;

  if (res == 1) {
    *len = mdlen;
    return 0;
  }

  return -1;
#else /* OpenSSL version >= 3.0 */
  unsigned int mdlen;
  int res;
  bool failed;

  if (ctx == NULL)
    return -2;

  if (mac == NULL || len == NULL) {
    HMAC_CTX_free(ctx->ctx);
    bin_clear_free(ctx, sizeof(*ctx));
    return 0;
  }

  mdlen = *len;
  res = HMAC_Final(ctx->ctx, mac, &mdlen);
  HMAC_CTX_free(ctx->ctx);
  failed = ctx->failed;
  bin_clear_free(ctx, sizeof(*ctx));

  if (TEST_FAIL())
    return -1;

  if (failed)
    return -2;

  if (res == 1) {
    *len = mdlen;
    return 0;
  }

  return -1;
#endif /* OpenSSL version >= 3.0 */
}


#if OPENSSL_VERSION_NUMBER >= 0x30000000L

static int openssl_hmac_vector(char *digest, const u8 *key,
             size_t key_len, size_t num_elem,
             const u8 *addr[], const size_t *len, u8 *mac,
             unsigned int mdlen)
{
  EVP_MAC *hmac;
  OSSL_PARAM params[2];
  EVP_MAC_CTX *ctx;
  size_t i, mlen;
  int res;
  const char *property_query = NULL;

  if (TEST_FAIL())
    return -1;

#ifndef CONFIG_FIPS
  if (os_strcmp(digest, "MD5") == 0) {
    openssl_need_md5();
    property_query = "provider!=fips";
  } else if (key_len < 14 && OSSL_PROVIDER_available(NULL, "fips")) {
    /* Need to use non-FIPS provider in OpenSSL to handle cases
     * where HMAC is used with salt that is less than 112 bits
     * instead of the HMAC uses with an actual key. */
    openssl_disable_fips();
    openssl_load_default_provider_if_fips();
    property_query = "provider!=fips";
  }
#endif /* CONFIG_FIPS */
  hmac = EVP_MAC_fetch(NULL, "HMAC", property_query);
  if (!hmac) {
    wpa_printf(MSG_INFO, "OpenSSL: EVP_MAC_fetch(HMAC) failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    return -1;
  }

  params[0] = OSSL_PARAM_construct_utf8_string("digest", digest, 0);
  params[1] = OSSL_PARAM_construct_end();

  ctx = EVP_MAC_CTX_new(hmac);
  EVP_MAC_free(hmac);
  if (!ctx)
    return -1;

  if (EVP_MAC_init(ctx, key, key_len, params) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: EVP_MAC_init(hmac,digest=%s,key_len=%zu) failed: %s",
         digest, key_len,
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  for (i = 0; i < num_elem; i++) {
    if (EVP_MAC_update(ctx, addr[i], len[i]) != 1)
      goto fail;
  }

  res = EVP_MAC_final(ctx, mac, &mlen, mdlen);
  EVP_MAC_CTX_free(ctx);

  return res == 1 ? 0 : -1;
fail:
  EVP_MAC_CTX_free(ctx);
  return -1;
}


#ifndef CONFIG_FIPS

int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
        const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector("MD5", key ,key_len, num_elem, addr, len,
           mac, 16);
}


int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
       u8 *mac)
{
  return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_FIPS */


int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem,
         const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector("SHA1", key, key_len, num_elem, addr,
           len, mac, 20);
}


int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
         u8 *mac)
{
  return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac);
}


#ifdef CONFIG_SHA256

int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector("SHA256", key, key_len, num_elem, addr,
           len, mac, 32);
}


int hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA256 */


#ifdef CONFIG_SHA384

int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector("SHA384", key, key_len, num_elem, addr,
           len, mac, 48);
}


int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA384 */


#ifdef CONFIG_SHA512

int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector("SHA512", key, key_len, num_elem, addr,
           len, mac, 64);
}


int hmac_sha512(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha512_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA512 */

#else /* OpenSSL version >= 3.0 */

static int openssl_hmac_vector(const EVP_MD *type, const u8 *key,
             size_t key_len, size_t num_elem,
             const u8 *addr[], const size_t *len, u8 *mac,
             unsigned int mdlen)
{
  HMAC_CTX *ctx;
  size_t i;
  int res;

  if (TEST_FAIL())
    return -1;

  ctx = HMAC_CTX_new();
  if (!ctx)
    return -1;
  res = HMAC_Init_ex(ctx, key, key_len, type, NULL);
  if (res != 1)
    goto done;

  for (i = 0; i < num_elem; i++)
    HMAC_Update(ctx, addr[i], len[i]);

  res = HMAC_Final(ctx, mac, &mdlen);
done:
  HMAC_CTX_free(ctx);

  return res == 1 ? 0 : -1;
}


#ifndef CONFIG_FIPS

int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
        const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector(EVP_md5(), key ,key_len, num_elem, addr, len,
           mac, 16);
}


int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
       u8 *mac)
{
  return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_FIPS */


int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem,
         const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector(EVP_sha1(), key, key_len, num_elem, addr,
           len, mac, 20);
}


int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
         u8 *mac)
{
  return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac);
}


#ifdef CONFIG_SHA256

int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector(EVP_sha256(), key, key_len, num_elem, addr,
           len, mac, 32);
}


int hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA256 */


#ifdef CONFIG_SHA384

int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector(EVP_sha384(), key, key_len, num_elem, addr,
           len, mac, 48);
}


int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA384 */


#ifdef CONFIG_SHA512

int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem,
           const u8 *addr[], const size_t *len, u8 *mac)
{
  return openssl_hmac_vector(EVP_sha512(), key, key_len, num_elem, addr,
           len, mac, 64);
}


int hmac_sha512(const u8 *key, size_t key_len, const u8 *data,
    size_t data_len, u8 *mac)
{
  return hmac_sha512_vector(key, key_len, 1, &data, &data_len, mac);
}

#endif /* CONFIG_SHA512 */

#endif /* OpenSSL version >= 3.0 */


int pbkdf2_sha1(const char *passphrase, const u8 *ssid, size_t ssid_len,
    int iterations, u8 *buf, size_t buflen)
{
  if (PKCS5_PBKDF2_HMAC_SHA1(passphrase, os_strlen(passphrase), ssid,
           ssid_len, iterations, buflen, buf) != 1)
    return -1;
  return 0;
}


#ifdef CONFIG_SHA256
int pbkdf2_sha256(const char *passphrase, const u8 *salt, size_t salt_len,
      int iterations, u8 *buf, size_t buflen)
{
  if (PKCS5_PBKDF2_HMAC(passphrase, os_strlen(passphrase), salt,
            salt_len, iterations, EVP_sha256(), buflen,
            buf) != 1)
    return -1;
  return 0;
}
#endif /* CONFIG_SHA256 */


#ifdef CONFIG_SHA384
int pbkdf2_sha384(const char *passphrase, const u8 *salt, size_t salt_len,
      int iterations, u8 *buf, size_t buflen)
{
  if (PKCS5_PBKDF2_HMAC(passphrase, os_strlen(passphrase), salt,
            salt_len, iterations, EVP_sha384(), buflen,
            buf) != 1)
    return -1;
  return 0;
}
#endif /* CONFIG_SHA384 */


int crypto_get_random(void *buf, size_t len)
{
  if (RAND_bytes(buf, len) != 1)
    return -1;
  return 0;
}


int omac1_aes_vector(const u8 *key, size_t key_len, size_t num_elem,
         const u8 *addr[], const size_t *len, u8 *mac)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_MAC_CTX *ctx = NULL;
  EVP_MAC *emac;
  int ret = -1;
  size_t outlen, i;
  OSSL_PARAM params[2];
  char *cipher = NULL;

  if (TEST_FAIL())
    return -1;

  emac = EVP_MAC_fetch(NULL, "CMAC", NULL);

  if (key_len == 32)
    cipher = "aes-256-cbc";
  else if (key_len == 24)
    cipher = "aes-192-cbc";
  else if (key_len == 16)
    cipher = "aes-128-cbc";

  params[0] = OSSL_PARAM_construct_utf8_string("cipher", cipher, 0);
  params[1] = OSSL_PARAM_construct_end();

  if (!emac || !cipher ||
      !(ctx = EVP_MAC_CTX_new(emac)) ||
      EVP_MAC_init(ctx, key, key_len, params) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: EVP_MAC_init(cmac,cipher=%s) failed: %s",
         cipher, ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  for (i = 0; i < num_elem; i++) {
    if (!EVP_MAC_update(ctx, addr[i], len[i]))
      goto fail;
  }
  if (EVP_MAC_final(ctx, mac, &outlen, 16) != 1 || outlen != 16)
    goto fail;

  ret = 0;
fail:
  EVP_MAC_CTX_free(ctx);
  EVP_MAC_free(emac);
  return ret;
#else /* OpenSSL version >= 3.0 */
  CMAC_CTX *ctx;
  int ret = -1;
  size_t outlen, i;

  if (TEST_FAIL())
    return -1;

  ctx = CMAC_CTX_new();
  if (ctx == NULL)
    return -1;

  if (key_len == 32) {
    if (!CMAC_Init(ctx, key, 32, EVP_aes_256_cbc(), NULL))
      goto fail;
  } else if (key_len == 24) {
    if (!CMAC_Init(ctx, key, 24, EVP_aes_192_cbc(), NULL))
      goto fail;
  } else if (key_len == 16) {
    if (!CMAC_Init(ctx, key, 16, EVP_aes_128_cbc(), NULL))
      goto fail;
  } else {
    goto fail;
  }
  for (i = 0; i < num_elem; i++) {
    if (!CMAC_Update(ctx, addr[i], len[i]))
      goto fail;
  }
  if (!CMAC_Final(ctx, mac, &outlen) || outlen != 16)
    goto fail;

  ret = 0;
fail:
  CMAC_CTX_free(ctx);
  return ret;
#endif /* OpenSSL version >= 3.0 */
}


int omac1_aes_128_vector(const u8 *key, size_t num_elem,
       const u8 *addr[], const size_t *len, u8 *mac)
{
  return omac1_aes_vector(key, 16, num_elem, addr, len, mac);
}


int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
{
  return omac1_aes_128_vector(key, 1, &data, &data_len, mac);
}


int omac1_aes_256(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
{
  return omac1_aes_vector(key, 32, 1, &data, &data_len, mac);
}


struct crypto_bignum * crypto_bignum_init(void)
{
  if (TEST_FAIL())
    return NULL;
  return (struct crypto_bignum *) BN_new();
}


struct crypto_bignum * crypto_bignum_init_set(const u8 *buf, size_t len)
{
  BIGNUM *bn;

  if (TEST_FAIL())
    return NULL;

  bn = BN_bin2bn(buf, len, NULL);
  return (struct crypto_bignum *) bn;
}


struct crypto_bignum * crypto_bignum_init_uint(unsigned int val)
{
  BIGNUM *bn;

  if (TEST_FAIL())
    return NULL;

  bn = BN_new();
  if (!bn)
    return NULL;
  if (BN_set_word(bn, val) != 1) {
    BN_free(bn);
    return NULL;
  }
  return (struct crypto_bignum *) bn;
}


void crypto_bignum_deinit(struct crypto_bignum *n, int clear)
{
  if (clear)
    BN_clear_free((BIGNUM *) n);
  else
    BN_free((BIGNUM *) n);
}


int crypto_bignum_to_bin(const struct crypto_bignum *a,
       u8 *buf, size_t buflen, size_t padlen)
{
  int num_bytes, offset;

  if (TEST_FAIL())
    return -1;

  if (padlen > buflen)
    return -1;

  if (padlen) {
#ifdef OPENSSL_IS_BORINGSSL
    if (BN_bn2bin_padded(buf, padlen, (const BIGNUM *) a) == 0)
      return -1;
    return padlen;
#else /* OPENSSL_IS_BORINGSSL */
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
    return BN_bn2binpad((const BIGNUM *) a, buf, padlen);
#endif
#endif
  }

  num_bytes = BN_num_bytes((const BIGNUM *) a);
  if ((size_t) num_bytes > buflen)
    return -1;
  if (padlen > (size_t) num_bytes)
    offset = padlen - num_bytes;
  else
    offset = 0;

  os_memset(buf, 0, offset);
  BN_bn2bin((const BIGNUM *) a, buf + offset);

  return num_bytes + offset;
}


int crypto_bignum_rand(struct crypto_bignum *r, const struct crypto_bignum *m)
{
  if (TEST_FAIL())
    return -1;
  return BN_rand_range((BIGNUM *) r, (const BIGNUM *) m) == 1 ? 0 : -1;
}


int crypto_bignum_add(const struct crypto_bignum *a,
          const struct crypto_bignum *b,
          struct crypto_bignum *c)
{
  return BN_add((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
    0 : -1;
}


int crypto_bignum_mod(const struct crypto_bignum *a,
          const struct crypto_bignum *b,
          struct crypto_bignum *c)
{
  int res;
  BN_CTX *bnctx;

  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -1;
  res = BN_mod((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b,
         bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_exptmod(const struct crypto_bignum *a,
        const struct crypto_bignum *b,
        const struct crypto_bignum *c,
        struct crypto_bignum *d)
{
  int res;
  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;

  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -1;
  res = BN_mod_exp_mont_consttime((BIGNUM *) d, (const BIGNUM *) a,
          (const BIGNUM *) b, (const BIGNUM *) c,
          bnctx, NULL);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_inverse(const struct crypto_bignum *a,
        const struct crypto_bignum *b,
        struct crypto_bignum *c)
{
  BIGNUM *res;
  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;
  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -1;
#ifdef OPENSSL_IS_BORINGSSL
  /* TODO: use BN_mod_inverse_blinded() ? */
#else /* OPENSSL_IS_BORINGSSL */
  BN_set_flags((BIGNUM *) a, BN_FLG_CONSTTIME);
#endif /* OPENSSL_IS_BORINGSSL */
  res = BN_mod_inverse((BIGNUM *) c, (const BIGNUM *) a,
           (const BIGNUM *) b, bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_sub(const struct crypto_bignum *a,
          const struct crypto_bignum *b,
          struct crypto_bignum *c)
{
  if (TEST_FAIL())
    return -1;
  return BN_sub((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b) ?
    0 : -1;
}


int crypto_bignum_div(const struct crypto_bignum *a,
          const struct crypto_bignum *b,
          struct crypto_bignum *c)
{
  int res;

  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;

  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -1;
#ifndef OPENSSL_IS_BORINGSSL
  BN_set_flags((BIGNUM *) a, BN_FLG_CONSTTIME);
#endif /* OPENSSL_IS_BORINGSSL */
  res = BN_div((BIGNUM *) c, NULL, (const BIGNUM *) a,
         (const BIGNUM *) b, bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_addmod(const struct crypto_bignum *a,
       const struct crypto_bignum *b,
       const struct crypto_bignum *c,
       struct crypto_bignum *d)
{
  int res;
  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;

  bnctx = BN_CTX_new();
  if (!bnctx)
    return -1;
  res = BN_mod_add((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
       (const BIGNUM *) c, bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_mulmod(const struct crypto_bignum *a,
       const struct crypto_bignum *b,
       const struct crypto_bignum *c,
       struct crypto_bignum *d)
{
  int res;

  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;

  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -1;
  res = BN_mod_mul((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
       (const BIGNUM *) c, bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_sqrmod(const struct crypto_bignum *a,
       const struct crypto_bignum *b,
       struct crypto_bignum *c)
{
  int res;
  BN_CTX *bnctx;

  if (TEST_FAIL())
    return -1;

  bnctx = BN_CTX_new();
  if (!bnctx)
    return -1;
  res = BN_mod_sqr((BIGNUM *) c, (const BIGNUM *) a, (const BIGNUM *) b,
       bnctx);
  BN_CTX_free(bnctx);

  return res ? 0 : -1;
}


int crypto_bignum_rshift(const struct crypto_bignum *a, int n,
       struct crypto_bignum *r)
{
  return BN_rshift((BIGNUM *) r, (const BIGNUM *) a, n) == 1 ? 0 : -1;
}


int crypto_bignum_cmp(const struct crypto_bignum *a,
          const struct crypto_bignum *b)
{
  return BN_cmp((const BIGNUM *) a, (const BIGNUM *) b);
}


int crypto_bignum_is_zero(const struct crypto_bignum *a)
{
  return BN_is_zero((const BIGNUM *) a);
}


int crypto_bignum_is_one(const struct crypto_bignum *a)
{
  return BN_is_one((const BIGNUM *) a);
}


int crypto_bignum_is_odd(const struct crypto_bignum *a)
{
  return BN_is_odd((const BIGNUM *) a);
}


int crypto_bignum_legendre(const struct crypto_bignum *a,
         const struct crypto_bignum *p)
{
  BN_CTX *bnctx;
  BIGNUM *exp = NULL, *tmp = NULL;
  int res = -2;
  unsigned int mask;

  if (TEST_FAIL())
    return -2;

  bnctx = BN_CTX_new();
  if (bnctx == NULL)
    return -2;

  exp = BN_new();
  tmp = BN_new();
  if (!exp || !tmp ||
      /* exp = (p-1) / 2 */
      !BN_sub(exp, (const BIGNUM *) p, BN_value_one()) ||
      !BN_rshift1(exp, exp) ||
      !BN_mod_exp_mont_consttime(tmp, (const BIGNUM *) a, exp,
               (const BIGNUM *) p, bnctx, NULL))
    goto fail;

  /* Return 1 if tmp == 1, 0 if tmp == 0, or -1 otherwise. Need to use
   * constant time selection to avoid branches here. */
  res = -1;
  mask = const_time_eq(BN_is_word(tmp, 1), 1);
  res = const_time_select_int(mask, 1, res);
  mask = const_time_eq(BN_is_zero(tmp), 1);
  res = const_time_select_int(mask, 0, res);

fail:
  BN_clear_free(tmp);
  BN_clear_free(exp);
  BN_CTX_free(bnctx);
  return res;
}


#ifdef CONFIG_ECC

struct crypto_ec {
  EC_GROUP *group;
  int nid;
  int iana_group;
  BN_CTX *bnctx;
  BIGNUM *prime;
  BIGNUM *order;
  BIGNUM *a;
  BIGNUM *b;
};


static int crypto_ec_group_2_nid(int group)
{
  /* Map from IANA registry for IKE D-H groups to OpenSSL NID */
  switch (group) {
  case 19:
    return NID_X9_62_prime256v1;
  case 20:
    return NID_secp384r1;
  case 21:
    return NID_secp521r1;
  case 25:
    return NID_X9_62_prime192v1;
  case 26:
    return NID_secp224r1;
#ifdef NID_brainpoolP224r1
  case 27:
    return NID_brainpoolP224r1;
#endif /* NID_brainpoolP224r1 */
#ifdef NID_brainpoolP256r1
  case 28:
    return NID_brainpoolP256r1;
#endif /* NID_brainpoolP256r1 */
#ifdef NID_brainpoolP384r1
  case 29:
    return NID_brainpoolP384r1;
#endif /* NID_brainpoolP384r1 */
#ifdef NID_brainpoolP512r1
  case 30:
    return NID_brainpoolP512r1;
#endif /* NID_brainpoolP512r1 */
  default:
    return -1;
  }
}


#if OPENSSL_VERSION_NUMBER >= 0x30000000L
static const char * crypto_ec_group_2_name(int group)
{
  /* Map from IANA registry for IKE D-H groups to OpenSSL group name */
  switch (group) {
  case 19:
    return "prime256v1";
  case 20:
    return "secp384r1";
  case 21:
    return "secp521r1";
  case 25:
    return "prime192v1";
  case 26:
    return "secp224r1";
#ifdef NID_brainpoolP224r1
  case 27:
    return "brainpoolP224r1";
#endif /* NID_brainpoolP224r1 */
#ifdef NID_brainpoolP256r1
  case 28:
    return "brainpoolP256r1";
#endif /* NID_brainpoolP256r1 */
#ifdef NID_brainpoolP384r1
  case 29:
    return "brainpoolP384r1";
#endif /* NID_brainpoolP384r1 */
#ifdef NID_brainpoolP512r1
  case 30:
    return "brainpoolP512r1";
#endif /* NID_brainpoolP512r1 */
  default:
    return NULL;
  }
}
#endif /* OpenSSL version >= 3.0 */


struct crypto_ec * crypto_ec_init(int group)
{
  struct crypto_ec *e;
  int nid;

  nid = crypto_ec_group_2_nid(group);
  if (nid < 0)
    return NULL;

  e = os_zalloc(sizeof(*e));
  if (e == NULL)
    return NULL;

  e->nid = nid;
  e->iana_group = group;
  e->bnctx = BN_CTX_new();
  e->group = EC_GROUP_new_by_curve_name(nid);
  e->prime = BN_new();
  e->order = BN_new();
  e->a = BN_new();
  e->b = BN_new();
  if (e->group == NULL || e->bnctx == NULL || e->prime == NULL ||
      e->order == NULL || e->a == NULL || e->b == NULL ||
      !EC_GROUP_get_curve(e->group, e->prime, e->a, e->b, e->bnctx) ||
      !EC_GROUP_get_order(e->group, e->order, e->bnctx)) {
    crypto_ec_deinit(e);
    e = NULL;
  }

  return e;
}


void crypto_ec_deinit(struct crypto_ec *e)
{
  if (e == NULL)
    return;
  BN_clear_free(e->b);
  BN_clear_free(e->a);
  BN_clear_free(e->order);
  BN_clear_free(e->prime);
  EC_GROUP_free(e->group);
  BN_CTX_free(e->bnctx);
  os_free(e);
}


struct crypto_ec_point * crypto_ec_point_init(struct crypto_ec *e)
{
  if (TEST_FAIL())
    return NULL;
  if (e == NULL)
    return NULL;
  return (struct crypto_ec_point *) EC_POINT_new(e->group);
}


size_t crypto_ec_prime_len(struct crypto_ec *e)
{
  return BN_num_bytes(e->prime);
}


size_t crypto_ec_prime_len_bits(struct crypto_ec *e)
{
  return BN_num_bits(e->prime);
}


size_t crypto_ec_order_len(struct crypto_ec *e)
{
  return BN_num_bytes(e->order);
}


const struct crypto_bignum * crypto_ec_get_prime(struct crypto_ec *e)
{
  return (const struct crypto_bignum *) e->prime;
}


const struct crypto_bignum * crypto_ec_get_order(struct crypto_ec *e)
{
  return (const struct crypto_bignum *) e->order;
}


const struct crypto_bignum * crypto_ec_get_a(struct crypto_ec *e)
{
  return (const struct crypto_bignum *) e->a;
}


const struct crypto_bignum * crypto_ec_get_b(struct crypto_ec *e)
{
  return (const struct crypto_bignum *) e->b;
}


const struct crypto_ec_point * crypto_ec_get_generator(struct crypto_ec *e)
{
  return (const struct crypto_ec_point *)
    EC_GROUP_get0_generator(e->group);
}


void crypto_ec_point_deinit(struct crypto_ec_point *p, int clear)
{
  if (clear)
    EC_POINT_clear_free((EC_POINT *) p);
  else
    EC_POINT_free((EC_POINT *) p);
}


int crypto_ec_point_x(struct crypto_ec *e, const struct crypto_ec_point *p,
          struct crypto_bignum *x)
{
  return EC_POINT_get_affine_coordinates(e->group,
                 (const EC_POINT *) p,
                 (BIGNUM *) x, NULL,
                 e->bnctx) == 1 ? 0 : -1;
}


int crypto_ec_point_to_bin(struct crypto_ec *e,
         const struct crypto_ec_point *point, u8 *x, u8 *y)
{
  BIGNUM *x_bn, *y_bn;
  int ret = -1;
  int len = BN_num_bytes(e->prime);

  if (TEST_FAIL())
    return -1;

  x_bn = BN_new();
  y_bn = BN_new();

  if (x_bn && y_bn &&
      EC_POINT_get_affine_coordinates(e->group, (EC_POINT *) point,
              x_bn, y_bn, e->bnctx)) {
    if (x) {
      ret = crypto_bignum_to_bin(
        (struct crypto_bignum *) x_bn, x, len, len);
    }
    if (ret >= 0 && y) {
      ret = crypto_bignum_to_bin(
        (struct crypto_bignum *) y_bn, y, len, len);
    }

    if (ret > 0)
      ret = 0;
  }

  BN_clear_free(x_bn);
  BN_clear_free(y_bn);
  return ret;
}


struct crypto_ec_point * crypto_ec_point_from_bin(struct crypto_ec *e,
              const u8 *val)
{
  BIGNUM *x, *y;
  EC_POINT *elem;
  int len = BN_num_bytes(e->prime);

  if (TEST_FAIL())
    return NULL;

  x = BN_bin2bn(val, len, NULL);
  y = BN_bin2bn(val + len, len, NULL);
  elem = EC_POINT_new(e->group);
  if (x == NULL || y == NULL || elem == NULL) {
    BN_clear_free(x);
    BN_clear_free(y);
    EC_POINT_clear_free(elem);
    return NULL;
  }

  if (!EC_POINT_set_affine_coordinates(e->group, elem, x, y, e->bnctx)) {
    EC_POINT_clear_free(elem);
    elem = NULL;
  }

  BN_clear_free(x);
  BN_clear_free(y);

  return (struct crypto_ec_point *) elem;
}


int crypto_ec_point_add(struct crypto_ec *e, const struct crypto_ec_point *a,
      const struct crypto_ec_point *b,
      struct crypto_ec_point *c)
{
  if (TEST_FAIL())
    return -1;
  return EC_POINT_add(e->group, (EC_POINT *) c, (const EC_POINT *) a,
          (const EC_POINT *) b, e->bnctx) ? 0 : -1;
}


int crypto_ec_point_mul(struct crypto_ec *e, const struct crypto_ec_point *p,
      const struct crypto_bignum *b,
      struct crypto_ec_point *res)
{
  if (TEST_FAIL())
    return -1;
  return EC_POINT_mul(e->group, (EC_POINT *) res, NULL,
          (const EC_POINT *) p, (const BIGNUM *) b, e->bnctx)
    ? 0 : -1;
}


int crypto_ec_point_invert(struct crypto_ec *e, struct crypto_ec_point *p)
{
  if (TEST_FAIL())
    return -1;
  return EC_POINT_invert(e->group, (EC_POINT *) p, e->bnctx) ? 0 : -1;
}


struct crypto_bignum *
crypto_ec_point_compute_y_sqr(struct crypto_ec *e,
            const struct crypto_bignum *x)
{
  BIGNUM *tmp;

  if (TEST_FAIL())
    return NULL;

  tmp = BN_new();

  /* y^2 = x^3 + ax + b = (x^2 + a)x + b */
  if (tmp &&
      BN_mod_sqr(tmp, (const BIGNUM *) x, e->prime, e->bnctx) &&
      BN_mod_add_quick(tmp, e->a, tmp, e->prime) &&
      BN_mod_mul(tmp, tmp, (const BIGNUM *) x, e->prime, e->bnctx) &&
      BN_mod_add_quick(tmp, tmp, e->b, e->prime))
    return (struct crypto_bignum *) tmp;

  BN_clear_free(tmp);
  return NULL;
}


int crypto_ec_point_is_at_infinity(struct crypto_ec *e,
           const struct crypto_ec_point *p)
{
  return EC_POINT_is_at_infinity(e->group, (const EC_POINT *) p);
}


int crypto_ec_point_is_on_curve(struct crypto_ec *e,
        const struct crypto_ec_point *p)
{
  return EC_POINT_is_on_curve(e->group, (const EC_POINT *) p,
            e->bnctx) == 1;
}


int crypto_ec_point_cmp(const struct crypto_ec *e,
      const struct crypto_ec_point *a,
      const struct crypto_ec_point *b)
{
  return EC_POINT_cmp(e->group, (const EC_POINT *) a,
          (const EC_POINT *) b, e->bnctx);
}


void crypto_ec_point_debug_print(const struct crypto_ec *e,
         const struct crypto_ec_point *p,
         const char *title)
{
  BIGNUM *x, *y;
  char *x_str = NULL, *y_str = NULL;

  x = BN_new();
  y = BN_new();
  if (!x || !y ||
      EC_POINT_get_affine_coordinates(e->group, (const EC_POINT *) p,
              x, y, e->bnctx) != 1)
    goto fail;

  x_str = BN_bn2hex(x);
  y_str = BN_bn2hex(y);
  if (!x_str || !y_str)
    goto fail;

  wpa_printf(MSG_DEBUG, "%s (%s,%s)", title, x_str, y_str);

fail:
  OPENSSL_free(x_str);
  OPENSSL_free(y_str);
  BN_free(x);
  BN_free(y);
}


struct crypto_ecdh {
  struct crypto_ec *ec;
  EVP_PKEY *pkey;
};

struct crypto_ecdh * crypto_ecdh_init(int group)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  struct crypto_ecdh *ecdh;
  const char *name;

  ecdh = os_zalloc(sizeof(*ecdh));
  if (!ecdh)
    goto fail;

  ecdh->ec = crypto_ec_init(group);
  if (!ecdh->ec)
    goto fail;

  name = OSSL_EC_curve_nid2name(ecdh->ec->nid);
  if (!name)
    goto fail;

  ecdh->pkey = EVP_EC_gen(name);
  if (!ecdh->pkey) {
    wpa_printf(MSG_INFO,
         "OpenSSL: EVP_EC_gen(group=%d) failed: %s",
         group, ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

done:
  return ecdh;
fail:
  crypto_ecdh_deinit(ecdh);
  ecdh = NULL;
  goto done;
#else /* OpenSSL version >= 3.0 */
  struct crypto_ecdh *ecdh;
  EVP_PKEY *params = NULL;
  EC_KEY *ec_params = NULL;
  EVP_PKEY_CTX *kctx = NULL;

  ecdh = os_zalloc(sizeof(*ecdh));
  if (!ecdh)
    goto fail;

  ecdh->ec = crypto_ec_init(group);
  if (!ecdh->ec)
    goto fail;

  ec_params = EC_KEY_new_by_curve_name(ecdh->ec->nid);
  if (!ec_params) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to generate EC_KEY parameters");
    goto fail;
  }
  EC_KEY_set_asn1_flag(ec_params, OPENSSL_EC_NAMED_CURVE);
  params = EVP_PKEY_new();
  if (!params || EVP_PKEY_set1_EC_KEY(params, ec_params) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to generate EVP_PKEY parameters");
    goto fail;
  }

  kctx = EVP_PKEY_CTX_new(params, NULL);
  if (!kctx)
    goto fail;

  if (EVP_PKEY_keygen_init(kctx) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EVP_PKEY_keygen_init failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  if (EVP_PKEY_keygen(kctx, &ecdh->pkey) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: EVP_PKEY_keygen failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

done:
  EC_KEY_free(ec_params);
  EVP_PKEY_free(params);
  EVP_PKEY_CTX_free(kctx);

  return ecdh;
fail:
  crypto_ecdh_deinit(ecdh);
  ecdh = NULL;
  goto done;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ecdh * crypto_ecdh_init2(int group, struct crypto_ec_key *own_key)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  struct crypto_ecdh *ecdh;

  ecdh = os_zalloc(sizeof(*ecdh));
  if (!ecdh)
    goto fail;

  ecdh->ec = crypto_ec_init(group);
  if (!ecdh->ec)
    goto fail;

  ecdh->pkey = EVP_PKEY_dup((EVP_PKEY *) own_key);
  if (!ecdh->pkey)
    goto fail;

  return ecdh;
fail:
  crypto_ecdh_deinit(ecdh);
  return NULL;
#else /* OpenSSL version >= 3.0 */
  struct crypto_ecdh *ecdh;

  ecdh = os_zalloc(sizeof(*ecdh));
  if (!ecdh)
    goto fail;

  ecdh->ec = crypto_ec_init(group);
  if (!ecdh->ec)
    goto fail;

  ecdh->pkey = EVP_PKEY_new();
  if (!ecdh->pkey ||
      EVP_PKEY_assign_EC_KEY(ecdh->pkey,
           EVP_PKEY_get1_EC_KEY((EVP_PKEY *) own_key))
      != 1)
    goto fail;

  return ecdh;
fail:
  crypto_ecdh_deinit(ecdh);
  return NULL;
#endif /* OpenSSL version >= 3.0 */
}


struct wpabuf * crypto_ecdh_get_pubkey(struct crypto_ecdh *ecdh, int inc_y)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  struct wpabuf *buf = NULL;
  unsigned char *pub;
  size_t len, exp_len;

  len = EVP_PKEY_get1_encoded_public_key(ecdh->pkey, &pub);
  if (len == 0)
    return NULL;

  /* Encoded using SECG SEC 1, Sec. 2.3.4 format */
  exp_len = 1 + 2 * crypto_ec_prime_len(ecdh->ec);
  if (len != exp_len) {
    wpa_printf(MSG_ERROR,
         "OpenSSL:%s: Unexpected encoded public key length %zu (expected %zu)",
         __func__, len, exp_len);
    goto fail;
  }
  buf = wpabuf_alloc_copy(pub + 1, inc_y ? len - 1 : len / 2);
fail:
  OPENSSL_free(pub);
  return buf;
#else /* OpenSSL version >= 3.0 */
  struct wpabuf *buf = NULL;
  EC_KEY *eckey;
  const EC_POINT *pubkey;
  BIGNUM *x, *y = NULL;
  int len = BN_num_bytes(ecdh->ec->prime);
  int res;

  eckey = EVP_PKEY_get1_EC_KEY(ecdh->pkey);
  if (!eckey)
    return NULL;

  pubkey = EC_KEY_get0_public_key(eckey);
  if (!pubkey)
    return NULL;

  x = BN_new();
  if (inc_y) {
    y = BN_new();
    if (!y)
      goto fail;
  }
  buf = wpabuf_alloc(inc_y ? 2 * len : len);
  if (!x || !buf)
    goto fail;

  if (EC_POINT_get_affine_coordinates(ecdh->ec->group, pubkey,
              x, y, ecdh->ec->bnctx) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EC_POINT_get_affine_coordinates failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  res = crypto_bignum_to_bin((struct crypto_bignum *) x,
           wpabuf_put(buf, len), len, len);
  if (res < 0)
    goto fail;

  if (inc_y) {
    res = crypto_bignum_to_bin((struct crypto_bignum *) y,
             wpabuf_put(buf, len), len, len);
    if (res < 0)
      goto fail;
  }

done:
  BN_clear_free(x);
  BN_clear_free(y);
  EC_KEY_free(eckey);

  return buf;
fail:
  wpabuf_free(buf);
  buf = NULL;
  goto done;
#endif /* OpenSSL version >= 3.0 */
}


struct wpabuf * crypto_ecdh_set_peerkey(struct crypto_ecdh *ecdh, int inc_y,
          const u8 *key, size_t len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *peerkey = EVP_PKEY_new();
  EVP_PKEY_CTX *ctx;
  size_t res_len;
  struct wpabuf *res = NULL;
  u8 *peer;

  /* Encode using SECG SEC 1, Sec. 2.3.4 format */
  peer = os_malloc(1 + len);
  if (!peer) {
    EVP_PKEY_free(peerkey);
    return NULL;
  }
  peer[0] = inc_y ? 0x04 : 0x02;
  os_memcpy(peer + 1, key, len);

  if (!peerkey ||
      EVP_PKEY_copy_parameters(peerkey, ecdh->pkey) != 1 ||
      EVP_PKEY_set1_encoded_public_key(peerkey, peer, 1 + len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: EVP_PKEY_set1_encoded_public_key failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    EVP_PKEY_free(peerkey);
    os_free(peer);
    return NULL;
  }
  os_free(peer);

  ctx = EVP_PKEY_CTX_new(ecdh->pkey, NULL);
  if (!ctx ||
      EVP_PKEY_derive_init(ctx) != 1 ||
      EVP_PKEY_derive_set_peer(ctx, peerkey) != 1 ||
      EVP_PKEY_derive(ctx, NULL, &res_len) != 1 ||
      !(res = wpabuf_alloc(res_len)) ||
      EVP_PKEY_derive(ctx, wpabuf_mhead(res), &res_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: EVP_PKEY_derive failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    wpabuf_free(res);
    res = NULL;
  } else {
    wpabuf_put(res, res_len);
  }

  EVP_PKEY_free(peerkey);
  EVP_PKEY_CTX_free(ctx);
  return res;
#else /* OpenSSL version >= 3.0 */
  BIGNUM *x, *y = NULL;
  EVP_PKEY_CTX *ctx = NULL;
  EVP_PKEY *peerkey = NULL;
  struct wpabuf *secret = NULL;
  size_t secret_len;
  EC_POINT *pub;
  EC_KEY *eckey = NULL;

  x = BN_bin2bn(key, inc_y ? len / 2 : len, NULL);
  pub = EC_POINT_new(ecdh->ec->group);
  if (!x || !pub)
    goto fail;

  if (inc_y) {
    y = BN_bin2bn(key + len / 2, len / 2, NULL);
    if (!y)
      goto fail;
    if (!EC_POINT_set_affine_coordinates(ecdh->ec->group, pub,
                 x, y, ecdh->ec->bnctx)) {
      wpa_printf(MSG_ERROR,
           "OpenSSL: EC_POINT_set_affine_coordinates failed: %s",
           ERR_error_string(ERR_get_error(), NULL));
      goto fail;
    }
  } else if (!EC_POINT_set_compressed_coordinates(ecdh->ec->group,
              pub, x, 0,
              ecdh->ec->bnctx)) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EC_POINT_set_compressed_coordinates failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  if (!EC_POINT_is_on_curve(ecdh->ec->group, pub, ecdh->ec->bnctx)) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: ECDH peer public key is not on curve");
    goto fail;
  }

  eckey = EC_KEY_new_by_curve_name(ecdh->ec->nid);
  if (!eckey || EC_KEY_set_public_key(eckey, pub) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EC_KEY_set_public_key failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  peerkey = EVP_PKEY_new();
  if (!peerkey || EVP_PKEY_set1_EC_KEY(peerkey, eckey) != 1)
    goto fail;

  ctx = EVP_PKEY_CTX_new(ecdh->pkey, NULL);
  if (!ctx || EVP_PKEY_derive_init(ctx) != 1 ||
      EVP_PKEY_derive_set_peer(ctx, peerkey) != 1 ||
      EVP_PKEY_derive(ctx, NULL, &secret_len) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EVP_PKEY_derive(1) failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  secret = wpabuf_alloc(secret_len);
  if (!secret)
    goto fail;
  if (EVP_PKEY_derive(ctx, wpabuf_put(secret, 0), &secret_len) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EVP_PKEY_derive(2) failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }
  if (secret->size != secret_len)
    wpa_printf(MSG_DEBUG,
         "OpenSSL: EVP_PKEY_derive(2) changed secret_len %d -> %d",
         (int) secret->size, (int) secret_len);
  wpabuf_put(secret, secret_len);

done:
  BN_free(x);
  BN_free(y);
  EC_KEY_free(eckey);
  EC_POINT_free(pub);
  EVP_PKEY_CTX_free(ctx);
  EVP_PKEY_free(peerkey);
  return secret;
fail:
  wpabuf_free(secret);
  secret = NULL;
  goto done;
#endif /* OpenSSL version >= 3.0 */
}


void crypto_ecdh_deinit(struct crypto_ecdh *ecdh)
{
  if (ecdh) {
    crypto_ec_deinit(ecdh->ec);
    EVP_PKEY_free(ecdh->pkey);
    os_free(ecdh);
  }
}


size_t crypto_ecdh_prime_len(struct crypto_ecdh *ecdh)
{
  return crypto_ec_prime_len(ecdh->ec);
}


struct crypto_ec_key * crypto_ec_key_parse_priv(const u8 *der, size_t der_len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY *pkey = NULL;
  OSSL_DECODER_CTX *ctx;

  ctx = OSSL_DECODER_CTX_new_for_pkey(
    &pkey, "DER", NULL, "EC",
    OSSL_KEYMGMT_SELECT_KEYPAIR |
    OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
    NULL, NULL);
  if (!ctx ||
      OSSL_DECODER_from_data(ctx, &der, &der_len) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Decoding EC private key (DER) failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    if (ctx)
      OSSL_DECODER_CTX_free(ctx);
    goto fail;
  }

  OSSL_DECODER_CTX_free(ctx);
  return (struct crypto_ec_key *) pkey;
fail:
  crypto_ec_key_deinit((struct crypto_ec_key *) pkey);
  return NULL;
#else /* OpenSSL version >= 3.0 */
  EVP_PKEY *pkey = NULL;
  EC_KEY *eckey;

  eckey = d2i_ECPrivateKey(NULL, &der, der_len);
  if (!eckey) {
    wpa_printf(MSG_INFO, "OpenSSL: d2i_ECPrivateKey() failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }
  EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);

  pkey = EVP_PKEY_new();
  if (!pkey || EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
    EC_KEY_free(eckey);
    goto fail;
  }

  return (struct crypto_ec_key *) pkey;
fail:
  crypto_ec_key_deinit((struct crypto_ec_key *) pkey);
  return NULL;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ec_key * crypto_ec_key_set_priv(int group,
                const u8 *raw, size_t raw_len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  const char *group_name;
  OSSL_PARAM params[4];
  EVP_PKEY_CTX *ctx = NULL;
  EVP_PKEY *pkey = NULL;
  BIGNUM *priv;
  EC_POINT *pub = NULL;
  EC_GROUP *ec_group = NULL;
  size_t len;
  u8 *pub_bin = NULL;
  u8 *priv_bin = NULL;
  int priv_bin_len;

  group_name = crypto_ec_group_2_name(group);
  if (!group_name)
    return NULL;

  priv = BN_bin2bn(raw, raw_len, NULL);
  if (!priv)
    return NULL;
  priv_bin = os_malloc(raw_len);
  if (!priv_bin)
    goto fail;
  priv_bin_len = BN_bn2lebinpad(priv, priv_bin, raw_len);
  if (priv_bin_len < 0)
    goto fail;

  ec_group = EC_GROUP_new_by_curve_name(crypto_ec_group_2_nid(group));
  if (!ec_group)
    goto fail;
  pub = EC_POINT_new(ec_group);
  if (!pub ||
      EC_POINT_mul(ec_group, pub, priv, NULL, NULL, NULL) != 1)
    goto fail;
  len = EC_POINT_point2oct(ec_group, pub, POINT_CONVERSION_UNCOMPRESSED,
         NULL, 0, NULL);
  if (len == 0)
    goto fail;
  pub_bin = os_malloc(len);
  if (!pub_bin)
    goto fail;
  len = EC_POINT_point2oct(ec_group, pub, POINT_CONVERSION_UNCOMPRESSED,
         pub_bin, len, NULL);
  if (len == 0)
    goto fail;

  params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                 (char *) group_name, 0);
  params[1] = OSSL_PARAM_construct_BN(OSSL_PKEY_PARAM_PRIV_KEY,
              priv_bin, priv_bin_len);
  params[2] = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_PUB_KEY,
                  pub_bin, len);
  params[3] = OSSL_PARAM_construct_end();

  ctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
  if (!ctx ||
      EVP_PKEY_fromdata_init(ctx) <= 0 ||
      EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_KEYPAIR, params) <= 0)
    goto fail;

out:
  bin_clear_free(priv_bin, raw_len);
  os_free(pub_bin);
  BN_clear_free(priv);
  EVP_PKEY_CTX_free(ctx);
  EC_POINT_free(pub);
  EC_GROUP_free(ec_group);
  return (struct crypto_ec_key *) pkey;

fail:
  EVP_PKEY_free(pkey);
  pkey = NULL;
  goto out;
#else /* OpenSSL version >= 3.0 */
  EC_KEY *eckey = NULL;
  EVP_PKEY *pkey = NULL;
  BIGNUM *priv = NULL;
  int nid;
  const EC_GROUP *ec_group;
  EC_POINT *pub = NULL;

  nid = crypto_ec_group_2_nid(group);
  if (nid < 0) {
    wpa_printf(MSG_ERROR, "OpenSSL: Unsupported group %d", group);
    return NULL;
  }

  eckey = EC_KEY_new_by_curve_name(nid);
  priv = BN_bin2bn(raw, raw_len, NULL);
  if (!eckey || !priv ||
      EC_KEY_set_private_key(eckey, priv) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to set EC_KEY: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  ec_group = EC_KEY_get0_group(eckey);
  if (!ec_group)
    goto fail;
  pub = EC_POINT_new(ec_group);
  if (!pub ||
      EC_POINT_mul(ec_group, pub, priv, NULL, NULL, NULL) != 1 ||
      EC_KEY_set_public_key(eckey, pub) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to set EC_KEY(pub): %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);

  pkey = EVP_PKEY_new();
  if (!pkey || EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: Could not create EVP_PKEY");
    goto fail;
  }

out:
  BN_clear_free(priv);
  EC_POINT_free(pub);
  return (struct crypto_ec_key *) pkey;

fail:
  EC_KEY_free(eckey);
  EVP_PKEY_free(pkey);
  pkey = NULL;
  goto out;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ec_key * crypto_ec_key_parse_pub(const u8 *der, size_t der_len)
{
  EVP_PKEY *pkey;

  pkey = d2i_PUBKEY(NULL, &der, der_len);
  if (!pkey) {
    wpa_printf(MSG_INFO, "OpenSSL: d2i_PUBKEY() failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  /* Ensure this is an EC key */
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (!EVP_PKEY_is_a(pkey, "EC"))
    goto fail;
#else /* OpenSSL version >= 3.0 */
  if (!EVP_PKEY_get0_EC_KEY(pkey))
    goto fail;
#endif /* OpenSSL version >= 3.0 */
  return (struct crypto_ec_key *) pkey;
fail:
  crypto_ec_key_deinit((struct crypto_ec_key *) pkey);
  return NULL;
}


struct crypto_ec_key * crypto_ec_key_set_pub(int group, const u8 *buf_x,
               const u8 *buf_y, size_t len)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  const char *group_name;
  OSSL_PARAM params[3];
  u8 *pub;
  EVP_PKEY_CTX *ctx;
  EVP_PKEY *pkey = NULL;

  group_name = crypto_ec_group_2_name(group);
  if (!group_name)
    return NULL;

  pub = os_malloc(1 + len * 2);
  if (!pub)
    return NULL;
  pub[0] = 0x04; /* uncompressed */
  os_memcpy(pub + 1, buf_x, len);
  os_memcpy(pub + 1 + len, buf_y, len);

  params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                 (char *) group_name, 0);
  params[1] = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_PUB_KEY,
                  pub, 1 + len * 2);
  params[2] = OSSL_PARAM_construct_end();

  ctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
  if (!ctx) {
    os_free(pub);
    return NULL;
  }
  if (EVP_PKEY_fromdata_init(ctx) <= 0 ||
      EVP_PKEY_fromdata(ctx, &pkey, EVP_PKEY_PUBLIC_KEY, params) <= 0) {
    os_free(pub);
    EVP_PKEY_CTX_free(ctx);
    return NULL;
  }

  os_free(pub);
  EVP_PKEY_CTX_free(ctx);

  return (struct crypto_ec_key *) pkey;
#else /* OpenSSL version >= 3.0 */
  EC_KEY *eckey = NULL;
  EVP_PKEY *pkey = NULL;
  EC_GROUP *ec_group = NULL;
  BN_CTX *ctx;
  EC_POINT *point = NULL;
  BIGNUM *x = NULL, *y = NULL;
  int nid;

  if (!buf_x || !buf_y)
    return NULL;

  nid = crypto_ec_group_2_nid(group);
  if (nid < 0) {
    wpa_printf(MSG_ERROR, "OpenSSL: Unsupported group %d", group);
    return NULL;
  }

  ctx = BN_CTX_new();
  if (!ctx)
    goto fail;

  ec_group = EC_GROUP_new_by_curve_name(nid);
  if (!ec_group)
    goto fail;

  x = BN_bin2bn(buf_x, len, NULL);
  y = BN_bin2bn(buf_y, len, NULL);
  point = EC_POINT_new(ec_group);
  if (!x || !y || !point)
    goto fail;

  if (!EC_POINT_set_affine_coordinates(ec_group, point, x, y, ctx)) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: EC_POINT_set_affine_coordinates failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  if (!EC_POINT_is_on_curve(ec_group, point, ctx) ||
      EC_POINT_is_at_infinity(ec_group, point)) {
    wpa_printf(MSG_ERROR, "OpenSSL: Invalid point");
    goto fail;
  }

  eckey = EC_KEY_new();
  if (!eckey ||
      EC_KEY_set_group(eckey, ec_group) != 1 ||
      EC_KEY_set_public_key(eckey, point) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to set EC_KEY: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }
  EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);

  pkey = EVP_PKEY_new();
  if (!pkey || EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: Could not create EVP_PKEY");
    goto fail;
  }

out:
  EC_GROUP_free(ec_group);
  BN_free(x);
  BN_free(y);
  EC_POINT_free(point);
  BN_CTX_free(ctx);
  return (struct crypto_ec_key *) pkey;

fail:
  EC_KEY_free(eckey);
  EVP_PKEY_free(pkey);
  pkey = NULL;
  goto out;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ec_key *
crypto_ec_key_set_pub_point(struct crypto_ec *ec,
          const struct crypto_ec_point *pub)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  int len = BN_num_bytes(ec->prime);
  struct crypto_ec_key *key;
  u8 *buf;

  buf = os_malloc(2 * len);
  if (!buf)
    return NULL;
  if (crypto_ec_point_to_bin(ec, pub, buf, buf + len) < 0) {
    os_free(buf);
    return NULL;
  }

  key = crypto_ec_key_set_pub(ec->iana_group, buf, buf + len, len);
  os_free(buf);

  return key;
#else /* OpenSSL version >= 3.0 */
  EC_KEY *eckey;
  EVP_PKEY *pkey = NULL;

  eckey = EC_KEY_new();
  if (!eckey ||
      EC_KEY_set_group(eckey, ec->group) != 1 ||
      EC_KEY_set_public_key(eckey, (const EC_POINT *) pub) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to set EC_KEY: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }
  EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);

  pkey = EVP_PKEY_new();
  if (!pkey || EVP_PKEY_assign_EC_KEY(pkey, eckey) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: Could not create EVP_PKEY");
    goto fail;
  }

out:
  return (struct crypto_ec_key *) pkey;

fail:
  EVP_PKEY_free(pkey);
  EC_KEY_free(eckey);
  pkey = NULL;
  goto out;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ec_key * crypto_ec_key_gen(int group)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_PKEY_CTX *ctx;
  OSSL_PARAM params[2];
  const char *group_name;
  EVP_PKEY *pkey = NULL;

  group_name = crypto_ec_group_2_name(group);
  if (!group_name)
    return NULL;

  params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                 (char *) group_name, 0);
  params[1] = OSSL_PARAM_construct_end();

  ctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
  if (!ctx ||
      EVP_PKEY_keygen_init(ctx) != 1 ||
      EVP_PKEY_CTX_set_params(ctx, params) != 1 ||
      EVP_PKEY_generate(ctx, &pkey) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Failed to generate EC keypair (group=%d): %s",
         group, ERR_error_string(ERR_get_error(), NULL));
    pkey = NULL;
  }

  EVP_PKEY_CTX_free(ctx);

  return (struct crypto_ec_key *) pkey;
#else /* OpenSSL version >= 3.0 */
  EVP_PKEY_CTX *kctx = NULL;
  EC_KEY *ec_params = NULL, *eckey;
  EVP_PKEY *params = NULL, *key = NULL;
  int nid;

  nid = crypto_ec_group_2_nid(group);
  if (nid < 0) {
    wpa_printf(MSG_ERROR, "OpenSSL: Unsupported group %d", group);
    return NULL;
  }

  ec_params = EC_KEY_new_by_curve_name(nid);
  if (!ec_params) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to generate EC_KEY parameters");
    goto fail;
  }
  EC_KEY_set_asn1_flag(ec_params, OPENSSL_EC_NAMED_CURVE);
  params = EVP_PKEY_new();
  if (!params || EVP_PKEY_set1_EC_KEY(params, ec_params) != 1) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to generate EVP_PKEY parameters");
    goto fail;
  }

  kctx = EVP_PKEY_CTX_new(params, NULL);
  if (!kctx ||
      EVP_PKEY_keygen_init(kctx) != 1 ||
      EVP_PKEY_keygen(kctx, &key) != 1) {
    wpa_printf(MSG_ERROR, "OpenSSL: Failed to generate EC key");
    key = NULL;
    goto fail;
  }

  eckey = EVP_PKEY_get1_EC_KEY(key);
  if (!eckey) {
    key = NULL;
    goto fail;
  }
  EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
  EC_KEY_free(eckey);

fail:
  EC_KEY_free(ec_params);
  EVP_PKEY_free(params);
  EVP_PKEY_CTX_free(kctx);
  return (struct crypto_ec_key *) key;
#endif /* OpenSSL version >= 3.0 */
}


void crypto_ec_key_deinit(struct crypto_ec_key *key)
{
  EVP_PKEY_free((EVP_PKEY *) key);
}


#ifdef OPENSSL_IS_BORINGSSL

/* BoringSSL version of i2d_PUBKEY() always outputs public EC key using
 * uncompressed form so define a custom function to export EC pubkey using
 * the compressed format that is explicitly required for some protocols. */

#include <openssl/asn1.h>
#include <openssl/asn1t.h>

typedef struct {
  /* AlgorithmIdentifier ecPublicKey with optional parameters present
   * as an OID identifying the curve */
  X509_ALGOR *alg;
  /* Compressed format public key per ANSI X9.63 */
  ASN1_BIT_STRING *pub_key;
} EC_COMP_PUBKEY;

ASN1_SEQUENCE(EC_COMP_PUBKEY) = {
  ASN1_SIMPLE(EC_COMP_PUBKEY, alg, X509_ALGOR),
  ASN1_SIMPLE(EC_COMP_PUBKEY, pub_key, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(EC_COMP_PUBKEY);

IMPLEMENT_ASN1_FUNCTIONS(EC_COMP_PUBKEY);

#endif /* OPENSSL_IS_BORINGSSL */


struct wpabuf * crypto_ec_key_get_subject_public_key(struct crypto_ec_key *key)
{
  EVP_PKEY *pkey = (EVP_PKEY *) key;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  OSSL_ENCODER_CTX *ctx;
  int selection;
  unsigned char *pdata = NULL;
  size_t pdata_len = 0;
  EVP_PKEY *copy = NULL;
  struct wpabuf *buf = NULL;

  if (EVP_PKEY_get_ec_point_conv_form(pkey) !=
      POINT_CONVERSION_COMPRESSED) {
    copy = EVP_PKEY_dup(pkey);
    if (!copy)
      return NULL;
    if (EVP_PKEY_set_utf8_string_param(
          copy, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
          OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_COMPRESSED) !=
        1) {
      wpa_printf(MSG_INFO,
           "OpenSSL: Failed to set compressed format");
      EVP_PKEY_free(copy);
      return NULL;
    }
    pkey = copy;
  }

  selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS |
    OSSL_KEYMGMT_SELECT_PUBLIC_KEY;

  ctx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, "DER",
              "SubjectPublicKeyInfo",
              NULL);
  if (!ctx || OSSL_ENCODER_to_data(ctx, &pdata, &pdata_len) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Failed to encode SubjectPublicKeyInfo: %s",
         ERR_error_string(ERR_get_error(), NULL));
    pdata = NULL;
  }
  OSSL_ENCODER_CTX_free(ctx);
  if (pdata) {
    buf = wpabuf_alloc_copy(pdata, pdata_len);
    OPENSSL_free(pdata);
  }

  EVP_PKEY_free(copy);

  return buf;
#else /* OpenSSL version >= 3.0 */
#ifdef OPENSSL_IS_BORINGSSL
  unsigned char *der = NULL;
  int der_len;
  const EC_KEY *eckey;
  struct wpabuf *ret = NULL;
  size_t len;
  const EC_GROUP *group;
  const EC_POINT *point;
  BN_CTX *ctx;
  EC_COMP_PUBKEY *pubkey = NULL;
  int nid;

  ctx = BN_CTX_new();
  eckey = EVP_PKEY_get0_EC_KEY(pkey);
  if (!ctx || !eckey)
    goto fail;

  group = EC_KEY_get0_group(eckey);
  point = EC_KEY_get0_public_key(eckey);
  if (!group || !point)
    goto fail;
  nid = EC_GROUP_get_curve_name(group);

  pubkey = EC_COMP_PUBKEY_new();
  if (!pubkey ||
      X509_ALGOR_set0(pubkey->alg, OBJ_nid2obj(EVP_PKEY_EC),
          V_ASN1_OBJECT, (void *) OBJ_nid2obj(nid)) != 1)
    goto fail;

  len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
         NULL, 0, ctx);
  if (len == 0)
    goto fail;

  der = OPENSSL_malloc(len);
  if (!der)
    goto fail;
  len = EC_POINT_point2oct(group, point, POINT_CONVERSION_COMPRESSED,
         der, len, ctx);

  OPENSSL_free(pubkey->pub_key->data);
  pubkey->pub_key->data = der;
  der = NULL;
  pubkey->pub_key->length = len;
  /* No unused bits */
  pubkey->pub_key->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
  pubkey->pub_key->flags |= ASN1_STRING_FLAG_BITS_LEFT;

  der_len = i2d_EC_COMP_PUBKEY(pubkey, &der);
  if (der_len <= 0) {
    wpa_printf(MSG_ERROR,
         "BoringSSL: Failed to build DER encoded public key");
    goto fail;
  }

  ret = wpabuf_alloc_copy(der, der_len);
fail:
  EC_COMP_PUBKEY_free(pubkey);
  OPENSSL_free(der);
  BN_CTX_free(ctx);
  return ret;
#else /* OPENSSL_IS_BORINGSSL */
  unsigned char *der = NULL;
  int der_len;
  struct wpabuf *buf;
  EC_KEY *eckey;

  eckey = EVP_PKEY_get1_EC_KEY(pkey);
  if (!eckey)
    return NULL;

  /* For now, all users expect COMPRESSED form */
  EC_KEY_set_conv_form(eckey, POINT_CONVERSION_COMPRESSED);

  der_len = i2d_PUBKEY((EVP_PKEY *) key, &der);
  EC_KEY_free(eckey);
  if (der_len <= 0) {
    wpa_printf(MSG_INFO, "OpenSSL: i2d_PUBKEY() failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    return NULL;
  }

  buf = wpabuf_alloc_copy(der, der_len);
  OPENSSL_free(der);
  return buf;
#endif /* OPENSSL_IS_BORINGSSL */
#endif /* OpenSSL version >= 3.0 */
}


struct wpabuf * crypto_ec_key_get_ecprivate_key(struct crypto_ec_key *key,
            bool include_pub)
{
  EVP_PKEY *pkey = (EVP_PKEY *) key;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  OSSL_ENCODER_CTX *ctx;
  int selection;
  unsigned char *pdata = NULL;
  size_t pdata_len = 0;
  struct wpabuf *buf;
  EVP_PKEY *copy = NULL;

  selection = OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS |
    OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
  if (include_pub) {
    selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
  } else {
    /* Not including OSSL_KEYMGMT_SELECT_PUBLIC_KEY does not seem
     * to really be sufficient, so clone the key and explicitly
     * mark it not to include the public key. */
    copy = EVP_PKEY_dup(pkey);
    if (!copy)
      return NULL;
    EVP_PKEY_set_int_param(copy, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC,
               0);
    pkey = copy;
  }

  ctx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, "DER",
              "type-specific", NULL);
  if (!ctx || OSSL_ENCODER_to_data(ctx, &pdata, &pdata_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL: OSSL_ENCODER failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    OSSL_ENCODER_CTX_free(ctx);
    EVP_PKEY_free(copy);
    return NULL;
  }
  OSSL_ENCODER_CTX_free(ctx);
  buf = wpabuf_alloc_copy(pdata, pdata_len);
  OPENSSL_free(pdata);
  EVP_PKEY_free(copy);
  return buf;
#else /* OpenSSL version >= 3.0 */
  EC_KEY *eckey;
  unsigned char *der = NULL;
  int der_len;
  struct wpabuf *buf;
  unsigned int key_flags;

  eckey = EVP_PKEY_get1_EC_KEY(pkey);
  if (!eckey)
    return NULL;

  key_flags = EC_KEY_get_enc_flags(eckey);
  if (include_pub)
    key_flags &= ~EC_PKEY_NO_PUBKEY;
  else
    key_flags |= EC_PKEY_NO_PUBKEY;
  EC_KEY_set_enc_flags(eckey, key_flags);

  EC_KEY_set_conv_form(eckey, POINT_CONVERSION_UNCOMPRESSED);

  der_len = i2d_ECPrivateKey(eckey, &der);
  EC_KEY_free(eckey);
  if (der_len <= 0)
    return NULL;
  buf = wpabuf_alloc_copy(der, der_len);
  OPENSSL_free(der);

  return buf;
#endif /* OpenSSL version >= 3.0 */
}


struct wpabuf * crypto_ec_key_get_pubkey_point(struct crypto_ec_key *key,
                 int prefix)
{
  EVP_PKEY *pkey = (EVP_PKEY *) key;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  struct wpabuf *buf;
  unsigned char *pos;
  size_t pub_len = OSSL_PARAM_UNMODIFIED;

  buf = NULL;
  if (!EVP_PKEY_is_a(pkey, "EC") ||
      EVP_PKEY_get_octet_string_param(pkey,
              OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY,
              NULL, 0, &pub_len) < 0 ||
      pub_len == OSSL_PARAM_UNMODIFIED ||
      !(buf = wpabuf_alloc(pub_len)) ||
      EVP_PKEY_get_octet_string_param(pkey,
              OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY,
              wpabuf_put(buf, pub_len),
              pub_len, NULL) != 1 ||
      wpabuf_head_u8(buf)[0] != 0x04) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Failed to get encoded public key: %s",
         ERR_error_string(ERR_get_error(), NULL));
    wpabuf_free(buf);
    return NULL;
  }

  if (!prefix) {
    /* Remove 0x04 prefix if requested */
    pos = wpabuf_mhead(buf);
    os_memmove(pos, pos + 1, pub_len - 1);
    buf->used--;
  }

  return buf;
#else /* OpenSSL version >= 3.0 */
  int len, res;
  EC_KEY *eckey;
  struct wpabuf *buf;
  unsigned char *pos;

  eckey = EVP_PKEY_get1_EC_KEY(pkey);
  if (!eckey)
    return NULL;
  EC_KEY_set_conv_form(eckey, POINT_CONVERSION_UNCOMPRESSED);
  len = i2o_ECPublicKey(eckey, NULL);
  if (len <= 0) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to determine public key encoding length");
    EC_KEY_free(eckey);
    return NULL;
  }

  buf = wpabuf_alloc(len);
  if (!buf) {
    EC_KEY_free(eckey);
    return NULL;
  }

  pos = wpabuf_put(buf, len);
  res = i2o_ECPublicKey(eckey, &pos);
  EC_KEY_free(eckey);
  if (res != len) {
    wpa_printf(MSG_ERROR,
         "OpenSSL: Failed to encode public key (res=%d/%d)",
         res, len);
    wpabuf_free(buf);
    return NULL;
  }

  if (!prefix) {
    /* Remove 0x04 prefix if requested */
    pos = wpabuf_mhead(buf);
    os_memmove(pos, pos + 1, len - 1);
    buf->used--;
  }

  return buf;
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_ec_point *
crypto_ec_key_get_public_key(struct crypto_ec_key *key)
{
  EVP_PKEY *pkey = (EVP_PKEY *) key;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  char group[64];
  unsigned char pub[256];
  size_t len;
  EC_POINT *point = NULL;
  EC_GROUP *grp;
  int res = 0;
  OSSL_PARAM params[2];

  if (!EVP_PKEY_is_a(pkey, "EC") ||
      EVP_PKEY_get_utf8_string_param(pkey, OSSL_PKEY_PARAM_GROUP_NAME,
             group, sizeof(group), &len) != 1 ||
      EVP_PKEY_get_octet_string_param(pkey, OSSL_PKEY_PARAM_PUB_KEY,
              pub, sizeof(pub), &len) != 1)
    return NULL;

  params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME,
                 group, 0);
  params[1] = OSSL_PARAM_construct_end();
  grp = EC_GROUP_new_from_params(params, NULL, NULL);
  if (!grp)
    goto fail;
  point = EC_POINT_new(grp);
  if (!point)
    goto fail;
  res = EC_POINT_oct2point(grp, point, pub, len, NULL);

fail:
  if (res != 1) {
    EC_POINT_free(point);
    point = NULL;
  }

  EC_GROUP_free(grp);

  return (struct crypto_ec_point *) point;
#else /* OpenSSL version >= 3.0 */
  const EC_KEY *eckey;
  const EC_POINT *point;
  const EC_GROUP *group;

  eckey = EVP_PKEY_get0_EC_KEY(pkey);
  if (!eckey)
    return NULL;
  group = EC_KEY_get0_group(eckey);
  if (!group)
    return NULL;
  point = EC_KEY_get0_public_key(eckey);
  if (!point)
    return NULL;
  return (struct crypto_ec_point *) EC_POINT_dup(point, group);
#endif /* OpenSSL version >= 3.0 */
}


struct crypto_bignum *
crypto_ec_key_get_private_key(struct crypto_ec_key *key)
{
  EVP_PKEY *pkey = (EVP_PKEY *) key;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  BIGNUM *bn = NULL;

  if (!EVP_PKEY_is_a(pkey, "EC") ||
      EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PRIV_KEY, &bn) != 1)
    return NULL;
  return (struct crypto_bignum *) bn;
#else /* OpenSSL version >= 3.0 */
  const EC_KEY *eckey;
  const BIGNUM *bn;

  eckey = EVP_PKEY_get0_EC_KEY(pkey);
  if (!eckey)
    return NULL;
  bn = EC_KEY_get0_private_key(eckey);
  if (!bn)
    return NULL;
  return (struct crypto_bignum *) BN_dup(bn);
#endif /* OpenSSL version >= 3.0 */
}


struct wpabuf * crypto_ec_key_sign(struct crypto_ec_key *key, const u8 *data,
           size_t len)
{
  EVP_PKEY_CTX *pkctx;
  struct wpabuf *sig_der;
  size_t sig_len;

  sig_len = EVP_PKEY_size((EVP_PKEY *) key);
  sig_der = wpabuf_alloc(sig_len);
  if (!sig_der)
    return NULL;

  pkctx = EVP_PKEY_CTX_new((EVP_PKEY *) key, NULL);
  if (!pkctx ||
      EVP_PKEY_sign_init(pkctx) <= 0 ||
      EVP_PKEY_sign(pkctx, wpabuf_put(sig_der, 0), &sig_len,
        data, len) <= 0) {
    wpabuf_free(sig_der);
    sig_der = NULL;
  } else {
    wpabuf_put(sig_der, sig_len);
  }

  EVP_PKEY_CTX_free(pkctx);
  return sig_der;
}


static int openssl_evp_pkey_ec_prime_len(struct crypto_ec_key *key)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  char gname[50];
  int nid;
  EC_GROUP *group;
  BIGNUM *prime = NULL;
  int prime_len = -1;

  if (EVP_PKEY_get_group_name((EVP_PKEY *) key, gname, sizeof(gname),
            NULL) != 1)
    return -1;
  nid = OBJ_txt2nid(gname);
  group = EC_GROUP_new_by_curve_name(nid);
  prime = BN_new();
  if (!group || !prime)
    goto fail;
  if (EC_GROUP_get_curve(group, prime, NULL, NULL, NULL) == 1)
    prime_len = BN_num_bytes(prime);
fail:
  EC_GROUP_free(group);
  BN_free(prime);
  return prime_len;
#else
  const EC_GROUP *group;
  const EC_KEY *eckey;
  BIGNUM *prime = NULL;
  int prime_len = -1;

  eckey = EVP_PKEY_get0_EC_KEY((EVP_PKEY *) key);
  if (!eckey)
    goto fail;
  group = EC_KEY_get0_group(eckey);
  prime = BN_new();
  if (!prime || !group ||
      !EC_GROUP_get_curve(group, prime, NULL, NULL, NULL))
    goto fail;
  prime_len = BN_num_bytes(prime);
fail:
  BN_free(prime);
  return prime_len;
#endif
}


struct wpabuf * crypto_ec_key_sign_r_s(struct crypto_ec_key *key,
               const u8 *data, size_t len)
{
  ECDSA_SIG *sig = NULL;
  const BIGNUM *r, *s;
  u8 *r_buf, *s_buf;
  struct wpabuf *buf;
  const unsigned char *p;
  int prime_len;

  prime_len = openssl_evp_pkey_ec_prime_len(key);
  if (prime_len < 0)
    return NULL;

  buf = crypto_ec_key_sign(key, data, len);
  if (!buf)
    return NULL;

  /* Extract (r,s) from Ecdsa-Sig-Value */

  p = wpabuf_head(buf);
  sig = d2i_ECDSA_SIG(NULL, &p, wpabuf_len(buf));
  if (!sig)
    goto fail;
  ECDSA_SIG_get0(sig, &r, &s);

  /* Re-use wpabuf returned by crypto_ec_key_sign() */
  buf->used = 0;
  r_buf = wpabuf_put(buf, prime_len);
  s_buf = wpabuf_put(buf, prime_len);
  if (crypto_bignum_to_bin((const struct crypto_bignum *) r, r_buf,
         prime_len, prime_len) < 0 ||
      crypto_bignum_to_bin((const struct crypto_bignum *) s, s_buf,
         prime_len, prime_len) < 0)
    goto fail;

out:
  ECDSA_SIG_free(sig);
  return buf;
fail:
  wpabuf_clear_free(buf);
  buf = NULL;
  goto out;
}


int crypto_ec_key_verify_signature(struct crypto_ec_key *key, const u8 *data,
           size_t len, const u8 *sig, size_t sig_len)
{
  EVP_PKEY_CTX *pkctx;
  int ret;

  pkctx = EVP_PKEY_CTX_new((EVP_PKEY *) key, NULL);
  if (!pkctx || EVP_PKEY_verify_init(pkctx) <= 0) {
    EVP_PKEY_CTX_free(pkctx);
    return -1;
  }

  ret = EVP_PKEY_verify(pkctx, sig, sig_len, data, len);
  EVP_PKEY_CTX_free(pkctx);
  if (ret == 1)
    return 1; /* signature ok */
  if (ret == 0)
    return 0; /* incorrect signature */
  return -1;
}


int crypto_ec_key_verify_signature_r_s(struct crypto_ec_key *key,
               const u8 *data, size_t len,
               const u8 *r, size_t r_len,
               const u8 *s, size_t s_len)
{
  ECDSA_SIG *sig;
  BIGNUM *r_bn, *s_bn;
  unsigned char *der = NULL;
  int der_len;
  int ret = -1;

  r_bn = BN_bin2bn(r, r_len, NULL);
  s_bn = BN_bin2bn(s, s_len, NULL);
  sig = ECDSA_SIG_new();
  if (!r_bn || !s_bn || !sig || ECDSA_SIG_set0(sig, r_bn, s_bn) != 1)
    goto fail;
  r_bn = NULL;
  s_bn = NULL;

  der_len = i2d_ECDSA_SIG(sig, &der);
  if (der_len <= 0) {
    wpa_printf(MSG_DEBUG,
         "OpenSSL: Could not DER encode signature");
    goto fail;
  }

  ret = crypto_ec_key_verify_signature(key, data, len, der, der_len);

fail:
  OPENSSL_free(der);
  BN_free(r_bn);
  BN_free(s_bn);
  ECDSA_SIG_free(sig);
  return ret;
}


int crypto_ec_key_group(struct crypto_ec_key *key)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  char gname[50];
  int nid;

  if (EVP_PKEY_get_group_name((EVP_PKEY *) key, gname, sizeof(gname),
            NULL) != 1)
    return -1;
  nid = OBJ_txt2nid(gname);
#else
  const EC_KEY *eckey;
  const EC_GROUP *group;
  int nid;

  eckey = EVP_PKEY_get0_EC_KEY((EVP_PKEY *) key);
  if (!eckey)
    return -1;
  group = EC_KEY_get0_group(eckey);
  if (!group)
    return -1;
  nid = EC_GROUP_get_curve_name(group);
#endif
  switch (nid) {
  case NID_X9_62_prime256v1:
    return 19;
  case NID_secp384r1:
    return 20;
  case NID_secp521r1:
    return 21;
#ifdef NID_brainpoolP256r1
  case NID_brainpoolP256r1:
    return 28;
#endif /* NID_brainpoolP256r1 */
#ifdef NID_brainpoolP384r1
  case NID_brainpoolP384r1:
    return 29;
#endif /* NID_brainpoolP384r1 */
#ifdef NID_brainpoolP512r1
  case NID_brainpoolP512r1:
    return 30;
#endif /* NID_brainpoolP512r1 */
  default:
    wpa_printf(MSG_ERROR,
         "OpenSSL: Unsupported curve (nid=%d) in EC key",
         nid);
    return -1;
  }
}


int crypto_ec_key_cmp(struct crypto_ec_key *key1, struct crypto_ec_key *key2)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  if (EVP_PKEY_eq((EVP_PKEY *) key1, (EVP_PKEY *) key2) != 1)
    return -1;
#else
  if (EVP_PKEY_cmp((EVP_PKEY *) key1, (EVP_PKEY *) key2) != 1)
    return -1;
#endif
  return 0;
}


void crypto_ec_key_debug_print(const struct crypto_ec_key *key,
             const char *title)
{
  BIO *out;
  size_t rlen;
  char *txt;
  int res;

  out = BIO_new(BIO_s_mem());
  if (!out)
    return;

  EVP_PKEY_print_private(out, (EVP_PKEY *) key, 0, NULL);
  rlen = BIO_ctrl_pending(out);
  txt = os_malloc(rlen + 1);
  if (txt) {
    res = BIO_read(out, txt, rlen);
    if (res > 0) {
      txt[res] = '\0';
      wpa_printf(MSG_DEBUG, "%s: %s", title, txt);
    }
    os_free(txt);
  }
  BIO_free(out);
}


struct wpabuf * crypto_pkcs7_get_certificates(const struct wpabuf *pkcs7)
{
#ifdef OPENSSL_IS_BORINGSSL
  CBS pkcs7_cbs;
#else /* OPENSSL_IS_BORINGSSL */
  PKCS7 *p7 = NULL;
  const unsigned char *p = wpabuf_head(pkcs7);
#endif /* OPENSSL_IS_BORINGSSL */
  STACK_OF(X509) *certs;
  int i, num;
  BIO *out = NULL;
  size_t rlen;
  struct wpabuf *pem = NULL;
  int res;

#ifdef OPENSSL_IS_BORINGSSL
  certs = sk_X509_new_null();
  if (!certs)
    goto fail;
  CBS_init(&pkcs7_cbs, wpabuf_head(pkcs7), wpabuf_len(pkcs7));
  if (!PKCS7_get_certificates(certs, &pkcs7_cbs)) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Could not parse PKCS#7 object: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }
#else /* OPENSSL_IS_BORINGSSL */
  p7 = d2i_PKCS7(NULL, &p, wpabuf_len(pkcs7));
  if (!p7) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Could not parse PKCS#7 object: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  switch (OBJ_obj2nid(p7->type)) {
  case NID_pkcs7_signed:
    certs = p7->d.sign->cert;
    break;
  case NID_pkcs7_signedAndEnveloped:
    certs = p7->d.signed_and_enveloped->cert;
    break;
  default:
    certs = NULL;
    break;
  }
#endif /* OPENSSL_IS_BORINGSSL */

  if (!certs || ((num = sk_X509_num(certs)) == 0)) {
    wpa_printf(MSG_INFO,
         "OpenSSL: No certificates found in PKCS#7 object");
    goto fail;
  }

  out = BIO_new(BIO_s_mem());
  if (!out)
    goto fail;

  for (i = 0; i < num; i++) {
    X509 *cert = sk_X509_value(certs, i);

    PEM_write_bio_X509(out, cert);
  }

  rlen = BIO_ctrl_pending(out);
  pem = wpabuf_alloc(rlen);
  if (!pem)
    goto fail;
  res = BIO_read(out, wpabuf_put(pem, 0), rlen);
  if (res <= 0) {
    wpabuf_free(pem);
    pem = NULL;
    goto fail;
  }
  wpabuf_put(pem, res);

fail:
#ifdef OPENSSL_IS_BORINGSSL
  if (certs)
    sk_X509_pop_free(certs, X509_free);
#else /* OPENSSL_IS_BORINGSSL */
  PKCS7_free(p7);
#endif /* OPENSSL_IS_BORINGSSL */
  if (out)
    BIO_free_all(out);

  return pem;
}


struct crypto_csr * crypto_csr_init(void)
{
  return (struct crypto_csr *)X509_REQ_new();
}


struct crypto_csr * crypto_csr_verify(const struct wpabuf *req)
{
  X509_REQ *csr;
  EVP_PKEY *pkey = NULL;
  const u8 *der = wpabuf_head(req);

  csr = d2i_X509_REQ(NULL, &der, wpabuf_len(req));
  if (!csr)
    return NULL;

  pkey = X509_REQ_get_pubkey((X509_REQ *)csr);
  if (!pkey)
    goto fail;

  if (X509_REQ_verify((X509_REQ *)csr, pkey) != 1)
    goto fail;

  EVP_PKEY_free(pkey);
  return (struct crypto_csr *)csr;
fail:
  EVP_PKEY_free(pkey);
  X509_REQ_free(csr);
  return NULL;
}


void crypto_csr_deinit(struct crypto_csr *csr)
{
  X509_REQ_free((X509_REQ *)csr);
}


int crypto_csr_set_ec_public_key(struct crypto_csr *csr, struct crypto_ec_key *key)
{
  if (!X509_REQ_set_pubkey((X509_REQ *)csr, (EVP_PKEY *)key))
    return -1;

  return 0;
}


int crypto_csr_set_name(struct crypto_csr *csr, enum crypto_csr_name type,
      const char *name)
{
  X509_NAME *n;
  int nid;
  int ret = -1;

  switch (type) {
  case CSR_NAME_CN:
    nid = NID_commonName;
    break;
  case CSR_NAME_SN:
    nid = NID_surname;
    break;
  case CSR_NAME_C:
    nid = NID_countryName;
    break;
  case CSR_NAME_O:
    nid = NID_organizationName;
    break;
  case CSR_NAME_OU:
    nid = NID_organizationalUnitName;
    break;
  default:
    return -1;
  }

  n = X509_NAME_new();
  if (!n)
    return -1;

#if OPENSSL_VERSION_NUMBER < 0x10100000L
  if (!X509_NAME_add_entry_by_NID(n, nid, MBSTRING_UTF8,
          (unsigned char *) name,
          os_strlen(name), -1, 0))
    goto fail;
#else
  if (!X509_NAME_add_entry_by_NID(n, nid, MBSTRING_UTF8,
          (const unsigned char *) name,
          os_strlen(name), -1, 0))
    goto fail;
#endif

  if (X509_REQ_set_subject_name((X509_REQ *) csr, n) != 1)
    goto fail;

  ret = 0;
fail:
  X509_NAME_free(n);
  return ret;
}


int crypto_csr_set_attribute(struct crypto_csr *csr, enum crypto_csr_attr attr,
           int attr_type, const u8 *value, size_t len)
{
  int nid;

  switch (attr) {
  case CSR_ATTR_CHALLENGE_PASSWORD:
    nid = NID_pkcs9_challengePassword;
    break;
  default:
    return -1;
  }

  if (!X509_REQ_add1_attr_by_NID((X509_REQ *) csr, nid, attr_type, value,
               len))
    return -1;

  return 0;
}


const u8 * crypto_csr_get_attribute(struct crypto_csr *csr,
            enum crypto_csr_attr attr,
            size_t *len, int *type)
{
  X509_ATTRIBUTE *attrib;
  const ASN1_TYPE *attrib_type;
  const ASN1_STRING *data;
  int loc;
  int nid;

  switch (attr) {
  case CSR_ATTR_CHALLENGE_PASSWORD:
    nid = NID_pkcs9_challengePassword;
    break;
  default:
    return NULL;
  }

  loc = X509_REQ_get_attr_by_NID((X509_REQ *) csr, nid, -1);
  if (loc < 0)
    return NULL;

  attrib = X509_REQ_get_attr((X509_REQ *) csr, loc);
  if (!attrib)
    return NULL;

  attrib_type = X509_ATTRIBUTE_get0_type(attrib, 0);
  if (!attrib_type)
    return NULL;
  *type = ASN1_TYPE_get(attrib_type);
  data = X509_ATTRIBUTE_get0_data(attrib, 0, *type, NULL);
  if (!data)
    return NULL;
  *len = ASN1_STRING_length(data);
  return ASN1_STRING_get0_data(data);
}


struct wpabuf * crypto_csr_sign(struct crypto_csr *csr,
        struct crypto_ec_key *key,
        enum crypto_hash_alg algo)
{
  const EVP_MD *sign_md;
  struct wpabuf *buf;
  unsigned char *der = NULL;
  int der_len;

  switch (algo) {
  case CRYPTO_HASH_ALG_SHA256:
    sign_md = EVP_sha256();
    break;
  case CRYPTO_HASH_ALG_SHA384:
    sign_md = EVP_sha384();
    break;
  case CRYPTO_HASH_ALG_SHA512:
    sign_md = EVP_sha512();
    break;
  default:
    return NULL;
  }

  if (!X509_REQ_sign((X509_REQ *) csr, (EVP_PKEY *) key, sign_md))
    return NULL;

  der_len = i2d_X509_REQ((X509_REQ *) csr, &der);
  if (der_len < 0)
    return NULL;

  buf = wpabuf_alloc_copy(der, der_len);
  OPENSSL_free(der);

  return buf;
}

#endif /* CONFIG_ECC */


static EVP_PKEY * crypto_rsa_key_read_public(FILE *f)
{
  EVP_PKEY *pkey;
  X509 *x509;
  const ASN1_TIME *not_before, *not_after;
  int res_before, res_after;

  pkey = PEM_read_PUBKEY(f, NULL, NULL, NULL);
  if (pkey)
    return pkey;

  rewind(f);
  x509 = PEM_read_X509(f, NULL, NULL, NULL);
  if (!x509)
    return NULL;

  not_before = X509_get0_notBefore(x509);
  not_after = X509_get0_notAfter(x509);
  if (!not_before || !not_after)
    goto fail;
  res_before = X509_cmp_current_time(not_before);
  res_after = X509_cmp_current_time(not_after);
  if (!res_before || !res_after)
    goto fail;
  if (res_before > 0 || res_after < 0) {
    wpa_printf(MSG_INFO,
         "OpenSSL: Certificate for RSA public key is not valid at this time (%d %d)",
         res_before, res_after);
    goto fail;
  }

  pkey = X509_get_pubkey(x509);
  X509_free(x509);

  if (!pkey)
    return NULL;
  if (EVP_PKEY_base_id(pkey) != EVP_PKEY_RSA) {
    wpa_printf(MSG_INFO, "OpenSSL: No RSA public key found");
    EVP_PKEY_free(pkey);
    return NULL;
  }

  return pkey;
fail:
  X509_free(x509);
  return NULL;
}


struct crypto_rsa_key * crypto_rsa_key_read(const char *file, bool private_key)
{
  FILE *f;
  EVP_PKEY *pkey;

  f = fopen(file, "r");
  if (!f)
    return NULL;
  if (private_key)
    pkey = PEM_read_PrivateKey(f, NULL, NULL, NULL);
  else
    pkey = crypto_rsa_key_read_public(f);
  fclose(f);
  return (struct crypto_rsa_key *) pkey;
}


#ifndef OPENSSL_NO_SHA256

struct wpabuf * crypto_rsa_oaep_sha256_encrypt(struct crypto_rsa_key *key,
                 const struct wpabuf *in)
{
#if !defined(LIBRESSL_VERSION_NUMBER) || LIBRESSL_VERSION_NUMBER >= 0x30400000L
  EVP_PKEY *pkey = (EVP_PKEY *) key;
  EVP_PKEY_CTX *pkctx;
  struct wpabuf *res = NULL;
  size_t outlen;

  pkctx = EVP_PKEY_CTX_new(pkey, NULL);
  if (!pkctx)
    goto fail;

  if (EVP_PKEY_encrypt_init(pkctx) != 1 ||
      EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0 ||
      EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, EVP_sha256()) <= 0 ||
      EVP_PKEY_encrypt(pkctx, NULL, &outlen, wpabuf_head(in),
           wpabuf_len(in)) != 1 ||
      !(res = wpabuf_alloc(outlen)) ||
      EVP_PKEY_encrypt(pkctx, wpabuf_put(res, 0), &outlen,
           wpabuf_head(in), wpabuf_len(in)) != 1) {
    wpabuf_free(res);
    res = NULL;
    goto fail;
  }
  wpabuf_put(res, outlen);

fail:
  EVP_PKEY_CTX_free(pkctx);
  return res;
#else
  wpa_printf(MSG_ERROR, "%s() not supported", __func__);
  return NULL;
#endif
}


struct wpabuf * crypto_rsa_oaep_sha256_decrypt(struct crypto_rsa_key *key,
                 const struct wpabuf *in)
{
#if !defined(LIBRESSL_VERSION_NUMBER) || LIBRESSL_VERSION_NUMBER >= 0x30400000L
  EVP_PKEY *pkey = (EVP_PKEY *) key;
  EVP_PKEY_CTX *pkctx;
  struct wpabuf *res = NULL;
  size_t outlen;

  pkctx = EVP_PKEY_CTX_new(pkey, NULL);
  if (!pkctx)
    goto fail;

  if (EVP_PKEY_decrypt_init(pkctx) != 1 ||
      EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0 ||
      EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, EVP_sha256()) <= 0 ||
      EVP_PKEY_decrypt(pkctx, NULL, &outlen, wpabuf_head(in),
           wpabuf_len(in)) != 1 ||
      !(res = wpabuf_alloc(outlen)) ||
      EVP_PKEY_decrypt(pkctx, wpabuf_put(res, 0), &outlen,
           wpabuf_head(in), wpabuf_len(in)) != 1) {
    wpabuf_free(res);
    res = NULL;
    goto fail;
  }
  wpabuf_put(res, outlen);

fail:
  EVP_PKEY_CTX_free(pkctx);
  return res;
#else
  wpa_printf(MSG_ERROR, "%s() not supported", __func__);
  return NULL;
#endif
}

#endif /* OPENSSL_NO_SHA256 */


void crypto_rsa_key_free(struct crypto_rsa_key *key)
{
  EVP_PKEY_free((EVP_PKEY *) key);
}


#ifdef CONFIG_DPP3

#define HPKE_MAX_SHARED_SECRET_LEN 66
#define HPKE_MAX_HASH_LEN 64
#define HPKE_MAX_KEY_LEN 32
#define HPKE_MAX_NONCE_LEN 12
#define HPKE_MAX_PUB_LEN (1 + 2 * 66)

struct hpke_context {
  /* KEM */
  enum hpke_kem_id kem_id;
  int kem_nid;
  int iana_group;
  size_t n_pk;
  size_t n_secret;
  const EVP_MD *kem_h;
  size_t kem_n_h;

  /* KDF */
  enum hpke_kdf_id kdf_id;
  const EVP_MD *kdf_h;
  size_t n_h;

  /* AEAD */
  enum hpke_aead_id aead_id;
  const EVP_CIPHER *cipher;
  size_t n_k;
  size_t n_n;
  size_t n_t;
  u8 key[HPKE_MAX_KEY_LEN];
  u8 base_nonce[HPKE_MAX_NONCE_LEN];
};


static void hpke_free_context(struct hpke_context *ctx)
{
  bin_clear_free(ctx, sizeof(*ctx));
}


static struct hpke_context * hpke_get_context(enum hpke_kem_id kem_id,
                enum hpke_kdf_id kdf_id,
                enum hpke_aead_id aead_id,
                struct crypto_ec_key *key)
{
  struct hpke_context *ctx;
  int group;

  ctx = os_zalloc(sizeof(*ctx));
  if (!ctx)
    return NULL;

  ctx->kem_id = kem_id;
  switch (kem_id) {
  case HPKE_DHKEM_P256_HKDF_SHA256:
    ctx->kem_nid = NID_X9_62_prime256v1;
    ctx->iana_group = 19;
    ctx->n_pk = 65;
    ctx->n_secret = 32;
    ctx->kem_h = EVP_sha256();
    ctx->kem_n_h = 32;
    break;
  case HPKE_DHKEM_P384_HKDF_SHA384:
    ctx->kem_nid = NID_secp384r1;
    ctx->iana_group = 20;
    ctx->n_pk = 97;
    ctx->n_secret = 48;
    ctx->kem_h = EVP_sha384();
    ctx->kem_n_h = 48;
    break;
  case HPKE_DHKEM_P521_HKDF_SHA512:
    ctx->kem_nid = NID_secp521r1;
    ctx->iana_group = 21;
    ctx->n_pk = 133;
    ctx->n_secret = 64;
    ctx->kem_h = EVP_sha512();
    ctx->kem_n_h = 64;
    break;
  default:
    goto fail;
  }

  ctx->kdf_id = kdf_id;
  switch (kdf_id) {
  case HPKE_KDF_HKDF_SHA256:
    ctx->kdf_h = EVP_sha256();
    ctx->n_h = 32;
    break;
  case HPKE_KDF_HKDF_SHA384:
    ctx->kdf_h = EVP_sha384();
    ctx->n_h = 48;
    break;
  case HPKE_KDF_HKDF_SHA512:
    ctx->kdf_h = EVP_sha512();
    ctx->n_h = 64;
    break;
  default:
    goto fail;
  }

  ctx->aead_id = aead_id;
  switch (aead_id) {
  case HPKE_AEAD_AES_128_GCM:
    ctx->cipher = EVP_aes_128_gcm();
    ctx->n_k = 16;
    ctx->n_n = 12;
    ctx->n_t = 16;
    break;
  case HPKE_AEAD_AES_256_GCM:
    ctx->cipher = EVP_aes_256_gcm();
    ctx->n_k = 32;
    ctx->n_n = 12;
    ctx->n_t = 16;
    break;
  default:
    goto fail;
  }

  /* Convert BP-256/384/512 to P-256/384/521 for DPP */
  group = crypto_ec_key_group(key);
  if (group == 28 && ctx->iana_group == 19) {
    ctx->iana_group = 28;
  } else if (group == 29 && ctx->iana_group == 20) {
    ctx->iana_group = 29;
  } else if (group == 30 && ctx->iana_group == 21) {
    ctx->iana_group = 30;
    ctx->n_pk = 129;
  }
  if (group != ctx->iana_group) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:group mismatch (%d != %d)",
         __func__, group, ctx->iana_group);
    goto fail;
  }

  return ctx;
fail:
  hpke_free_context(ctx);
  return NULL;
}


static size_t hpke_suite_id(struct hpke_context *ctx, bool kem, u8 *suite_id)
{
  size_t suite_id_len;

  if (kem) {
    os_memcpy(suite_id, "KEM", 3);
    WPA_PUT_BE16(&suite_id[3], ctx->kem_id);
    suite_id_len = 5;
  } else {
    os_memcpy(suite_id, "HPKE", 4);
    WPA_PUT_BE16(&suite_id[4], ctx->kem_id);
    WPA_PUT_BE16(&suite_id[6], ctx->kdf_id);
    WPA_PUT_BE16(&suite_id[8], ctx->aead_id);
    suite_id_len = 10;
  }
  return suite_id_len;
}


static int hpke_labeled_extract(struct hpke_context *ctx, bool kem,
        const u8 *salt, size_t salt_len,
        const char *label,
        const u8 *ikm, size_t ikm_len, u8 *prk)
{
  u8 zero[HPKE_MAX_HASH_LEN];
  u8 suite_id[10];
  size_t suite_id_len;
  unsigned int mdlen = kem ? ctx->kem_n_h : ctx->n_h;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_MAC *hmac;
  OSSL_PARAM params[2];
  EVP_MAC_CTX *hctx;
  size_t mlen;
  int res;
#else /* OpenSSL version >= 3.0 */
  HMAC_CTX *hctx;
  int res;
#endif /* OpenSSL version >= 3.0 */

  if (!salt || !salt_len) {
    salt_len = mdlen;
    os_memset(zero, 0, salt_len);
    salt = zero;
  }

  suite_id_len = hpke_suite_id(ctx, kem, suite_id);

  /* labeled_ikm = concat("HPKE-v1", suite_id, label, ikm)
   * return Extract(salt, labeled_ikm) */

#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  hmac = EVP_MAC_fetch(NULL, "HMAC", NULL);
  if (!hmac)
    return -1;

  params[0] = OSSL_PARAM_construct_utf8_string(
    "digest",
    (char *) EVP_MD_get0_name(kem ? ctx->kem_h : ctx->kdf_h), 0);
  params[1] = OSSL_PARAM_construct_end();

  hctx = EVP_MAC_CTX_new(hmac);
  EVP_MAC_free(hmac);
  if (!hctx)
    return -1;

  if (EVP_MAC_init(hctx, salt, salt_len, params) != 1) {
    wpa_printf(MSG_INFO,
         "OpenSSL: EVP_MAC_init(hmac,digest/HPKE) failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  if (EVP_MAC_update(hctx, (const unsigned char *) "HPKE-v1", 7) != 1 ||
      EVP_MAC_update(hctx, suite_id, suite_id_len) != 1 ||
      EVP_MAC_update(hctx, (const unsigned char *) label,
         os_strlen(label)) != 1 ||
      EVP_MAC_update(hctx, ikm, ikm_len) != 1)
    goto fail;

  res = EVP_MAC_final(hctx, prk, &mlen, mdlen);
  EVP_MAC_CTX_free(hctx);

  return res == 1 ? 0 : -1;
fail:
  EVP_MAC_CTX_free(hctx);
  return -1;
#else /* OpenSSL version >= 3.0 */
  hctx = HMAC_CTX_new();
  if (!hctx)
    return -1;
  res = HMAC_Init_ex(hctx, salt, salt_len, kem ? ctx->kem_h : ctx->kdf_h,
         NULL);
  if (res != 1)
    goto done;

  HMAC_Update(hctx, (const unsigned char *) "HPKE-v1", 7);
  HMAC_Update(hctx, suite_id, suite_id_len);
  HMAC_Update(hctx, (const unsigned char *) label, os_strlen(label));
  HMAC_Update(hctx, ikm, ikm_len);

  res = HMAC_Final(hctx, prk, &mdlen);
done:
  HMAC_CTX_free(hctx);

  return res == 1 ? 0 : -1;
#endif /* OpenSSL version >= 3.0 */
}


static int
hpke_labeled_expand(struct hpke_context *ctx, bool kem, const u8 *prk,
        const char *label, const u8 *info, size_t info_len,
        u8 *out, size_t out_len)
{
  u8 suite_id[10];
  size_t suite_id_len;
  u8 hash[HPKE_MAX_HASH_LEN];
  u8 iter = 0;
  size_t label_len = os_strlen(label);
  u8 *pos;
  size_t left = out_len, clen;
  int res = -1;
  u8 *labeled_info;
  size_t labeled_info_len;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_MAC *hmac;
  OSSL_PARAM params[2];
  EVP_MAC_CTX *hctx = NULL;
  size_t mdlen;
#else /* OpenSSL version >= 3.0 */
  HMAC_CTX *hctx;
  unsigned int mdlen;
#endif /* OpenSSL version >= 3.0 */

  /* labeled_info = concat(I2OSP(L, 2), "HPKE-v1", suite_id,
   *                       label, info)
   * return Expand(prk, labeled_info, L) */
  suite_id_len = hpke_suite_id(ctx, kem, suite_id);
  labeled_info_len = 2 + 7 + suite_id_len + label_len + info_len;
  labeled_info = os_malloc(labeled_info_len);
  if (!labeled_info)
    return -1;
  pos = labeled_info;
  WPA_PUT_BE16(pos, out_len);
  pos += 2;
  os_memcpy(pos, "HPKE-v1", 7);
  pos += 7;
  os_memcpy(pos, suite_id, suite_id_len);
  pos += suite_id_len;
  os_memcpy(pos, label, label_len);
  pos += label_len;
  if (info && info_len)
    os_memcpy(pos, info, info_len);

  pos = out;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  hmac = EVP_MAC_fetch(NULL, "HMAC", NULL);
  if (!hmac)
    goto fail;

  params[0] = OSSL_PARAM_construct_utf8_string(
    "digest",
    (char *) EVP_MD_get0_name(kem ? ctx->kem_h : ctx->kdf_h), 0);
  params[1] = OSSL_PARAM_construct_end();
#else /* OpenSSL version >= 3.0 */
  hctx = HMAC_CTX_new();
  if (!hctx)
    goto fail;
#endif /* OpenSSL version >= 3.0 */

  while (left > 0) {
    mdlen = kem ? ctx->kem_n_h : ctx->n_h;
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
    EVP_MAC_CTX_free(hctx);
    hctx = EVP_MAC_CTX_new(hmac);
    if (!hctx)
      goto fail;

    if (EVP_MAC_init(hctx, prk, mdlen, params) != 1) {
      wpa_printf(MSG_INFO,
           "OpenSSL: EVP_MAC_init(hmac,digest/HPKE) failed: %s",
           ERR_error_string(ERR_get_error(), NULL));
      goto fail;
    }

    if (iter > 0 && EVP_MAC_update(hctx, hash, mdlen) != 1)
      goto fail;
    if (iter == 255)
      goto fail;
    iter++;

    if (EVP_MAC_update(hctx, labeled_info, labeled_info_len) != 1 ||
        EVP_MAC_update(hctx, &iter, sizeof(iter)) != 1)
      goto fail;

    if (EVP_MAC_final(hctx, hash, &mdlen, mdlen) != 1)
      goto fail;
#else /* OpenSSL version >= 3.0 */
    if (HMAC_Init_ex(hctx, prk, mdlen,
         kem ? ctx->kem_h : ctx->kdf_h,
         NULL) != 1)
      goto fail;

    if (iter > 0)
      HMAC_Update(hctx, hash, mdlen);
    if (iter == 255)
      goto fail;
    iter++;
    HMAC_Update(hctx, labeled_info, labeled_info_len);
    HMAC_Update(hctx, &iter, sizeof(iter));

    if (HMAC_Final(hctx, hash, &mdlen) != 1)
      goto fail;
    HMAC_CTX_reset(hctx);
#endif /* OpenSSL version >= 3.0 */

    clen = left > mdlen ? mdlen : left;
    os_memcpy(pos, hash, clen);
    pos += clen;
    left -= clen;
  }
  res = 0;
fail:
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
  EVP_MAC_free(hmac);
  EVP_MAC_CTX_free(hctx);
#else /* OpenSSL version >= 3.0 */
  HMAC_CTX_free(hctx);
#endif /* OpenSSL version >= 3.0 */
  os_free(labeled_info);

  return res;
}


static int hpke_extract_and_expand(struct hpke_context *ctx,
           const u8 *dhss, size_t dhss_len,
           const u8 *enc, size_t enc_len,
           const u8 *pk_rm, size_t pk_rm_len,
           u8 *shared_secret)
{
  u8 kem_context[2 * HPKE_MAX_PUB_LEN];
  u8 eae_prk[HPKE_MAX_HASH_LEN];

  /* eae_prk = LabeledExtract("", "eae_prk", dh) */
  if (hpke_labeled_extract(ctx, true, NULL, 0, "eae_prk", dhss, dhss_len,
         eae_prk) < 0)
    return -1;

  if (enc_len > HPKE_MAX_PUB_LEN || pk_rm_len > HPKE_MAX_PUB_LEN)
    return -1;
  /* kem_context = concat(enc, pkRm) */
  os_memcpy(kem_context, enc, enc_len);
  os_memcpy(&kem_context[enc_len], pk_rm, pk_rm_len);

  /* shared_secret = LabeledExpand(eae_prk, "shared_secret",
   *                               kem_context, Nsecret) */
  if (hpke_labeled_expand(ctx, true, eae_prk, "shared_secret",
        kem_context, enc_len + pk_rm_len,
        shared_secret, ctx->n_secret) < 0)
    return -1;

  forced_memzero(eae_prk, sizeof(eae_prk));
  return 0;
}


static int hpke_key_schedule(struct hpke_context *ctx, const u8 *shared_secret,
           const u8 *info, size_t info_len)
{
  u8 key_schedule_context[1 + 2 * HPKE_MAX_HASH_LEN];
  u8 secret[HPKE_MAX_HASH_LEN];
  int res = -1;

  /* key_schedule_context = concat(mode, psk_id_hash, info_hash) */
  key_schedule_context[0] = HPKE_MODE_BASE;

  /* psk_id_hash = LabeledExtract("", "psk_id_hash", psk_id) */
  if (hpke_labeled_extract(ctx, false, NULL, 0, "psk_id_hash",
         NULL, 0, &key_schedule_context[1]) < 0)
    goto fail;

  /* info_hash = LabeledExtract("", "info_hash", info) */
  if (hpke_labeled_extract(ctx, false, NULL, 0, "info_hash",
         info, info_len,
         &key_schedule_context[1 + ctx->n_h]) < 0)
    goto fail;

  /* secret = LabeledExtract(shared_secret, "secret", psk) */
  if (hpke_labeled_extract(ctx, false, shared_secret, ctx->n_secret,
         "secret", NULL, 0, secret) < 0)
    goto fail;

  /* key = LabeledExpand(secret, "key", key_schedule_context, Nk) */
  if (hpke_labeled_expand(ctx, false, secret, "key",
        key_schedule_context, 1 + 2 * ctx->n_h,
        ctx->key, ctx->n_k) < 0)
    goto fail;

  /* base_nonce = LabeledExpand(secret, "base_nonce",
   *                            key_schedule_context, Nn) */
  if (hpke_labeled_expand(ctx, false, secret, "base_nonce",
        key_schedule_context, 1 + 2 * ctx->n_h,
        ctx->base_nonce, ctx->n_n) < 0)
    goto fail;
  res = 0;
fail:
  forced_memzero(key_schedule_context, sizeof(key_schedule_context));
  forced_memzero(secret, sizeof(secret));
  return res;
}


static int hpke_encap(struct hpke_context *ctx, struct crypto_ec_key *pk_r,
          u8 *shared_secret, u8 *enc)
{
  EVP_PKEY_CTX *pctx = NULL;
  struct crypto_ec_key *sk_e;
  int res = -1;
  u8 *dhss = NULL;
  size_t dhss_len = 0;
  struct wpabuf *enc_buf = NULL, *pk_rm = NULL;

  /* skE, pkE = GenerateKeyPair() */
  sk_e = crypto_ec_key_gen(ctx->iana_group);
  if (!sk_e) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:Could not generate key pair",
         __func__);
    goto fail;
  }

  /* dh = DH(skE, pkR) */
  dhss_len = sizeof(dhss);
  pctx = EVP_PKEY_CTX_new((EVP_PKEY *) sk_e, NULL);
  if (!pctx ||
      EVP_PKEY_derive_init(pctx) != 1 ||
      EVP_PKEY_derive_set_peer(pctx, (EVP_PKEY *) pk_r) != 1 ||
      EVP_PKEY_derive(pctx, NULL, &dhss_len) != 1 ||
      !(dhss = os_malloc(dhss_len)) ||
      EVP_PKEY_derive(pctx, dhss, &dhss_len) != 1 ||
      dhss_len > HPKE_MAX_SHARED_SECRET_LEN) {
    wpa_printf(MSG_INFO,
         "OpenSSL: hpke_encap: EVP_PKEY_derive failed (dhss_len=%zu): %s",
         dhss_len, ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  /* enc = SerializePublicKey(pkE) */
  enc_buf = crypto_ec_key_get_pubkey_point(sk_e, 1);
  if (!enc_buf)
    goto fail;
  os_memcpy(enc, wpabuf_head(enc_buf), wpabuf_len(enc_buf));

  /* pkRm = SerializePublicKey(pkR) */
  pk_rm = crypto_ec_key_get_pubkey_point(pk_r, 1);
  if (!pk_rm)
    goto fail;

  /* kem_context = concat(enc, pkRm) */
  /* shared_secret = ExtractAndExpand(dh, kem_context) */
  /* return shared_secret, enc */
  res = hpke_extract_and_expand(ctx, dhss, dhss_len, enc, ctx->n_pk,
              wpabuf_head(pk_rm),
              wpabuf_len(pk_rm), shared_secret);
fail:
  bin_clear_free(dhss, dhss_len);
  crypto_ec_key_deinit(sk_e);
  EVP_PKEY_CTX_free(pctx);
  wpabuf_free(enc_buf);
  wpabuf_free(pk_rm);
  return res;
}


static struct wpabuf *
hpke_aead_seal(struct hpke_context *ctx, const u8 *aad, size_t aad_len,
         const u8 *pt, size_t pt_len)
{
  EVP_CIPHER_CTX *cctx;
  int len = 0;
  struct wpabuf *ct = NULL;

  /* No need to xor in sequence number since we support only the
   * single-shot API, i.e., base_nonce can be used as-is. */

  cctx = EVP_CIPHER_CTX_new();
  if (!cctx ||
      EVP_EncryptInit_ex(cctx, ctx->cipher, NULL, ctx->key,
             ctx->base_nonce) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptInit_ex failed",
         __func__);
    goto fail;
  }
  if (aad && aad_len &&
      EVP_EncryptUpdate(cctx, NULL, &len, aad, aad_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_EncryptUpdate(AAD) failed",
         __func__);
    goto fail;
  }
  ct = wpabuf_alloc(pt_len + AES_BLOCK_SIZE + ctx->n_t);
  if (!ct)
    goto fail;
  if (EVP_EncryptUpdate(cctx, wpabuf_put(ct, 0), &len, pt, pt_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_EncryptUpdate failed",
         __func__);
    goto fail;
  }
  wpabuf_put(ct, len);

  if (EVP_EncryptFinal(cctx, wpabuf_put(ct, 0), &len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptFinal failed",
         __func__);
    wpabuf_free(ct);
    ct = NULL;
    goto fail;
  }

  if (EVP_CIPHER_CTX_ctrl(cctx, EVP_CTRL_AEAD_GET_TAG, ctx->n_t,
        wpabuf_put(ct, ctx->n_t)) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:Could not get tag",
         __func__);
    wpabuf_free(ct);
    ct = NULL;
    goto fail;
  }
fail:
  EVP_CIPHER_CTX_free(cctx);
  return ct;
}


static struct wpabuf * hpke_base_seal_int(enum hpke_kem_id kem_id,
            enum hpke_kdf_id kdf_id,
            enum hpke_aead_id aead_id,
            struct crypto_ec_key *peer_pub,
            const u8 *info, size_t info_len,
            const u8 *aad, size_t aad_len,
            const u8 *pt, size_t pt_len)
{
  struct hpke_context *ctx;
  u8 shared_secret[HPKE_MAX_SHARED_SECRET_LEN];
  u8 enc[1 + 2 * HPKE_MAX_PUB_LEN];
  struct wpabuf *ct = NULL, *enc_ct = NULL;

  ctx = hpke_get_context(kem_id, kdf_id, aead_id, peer_pub);
  if (!ctx)
    return NULL;

  /* shared_secret, enc = Encap(pkR) */
  if (hpke_encap(ctx, peer_pub, shared_secret, enc) < 0)
    goto fail;

  /* KeyScheduleS(mode_base, shared_secret, info,
   *              default_psk, default_psk_id) */
  if (hpke_key_schedule(ctx, shared_secret, info, info_len) < 0)
    goto fail;

  /* ct = ctx.Seal(aad, pt) */
  ct = hpke_aead_seal(ctx, aad, aad_len, pt, pt_len);
  if (!ct)
    goto fail;

  /* return enc, ct */
  enc_ct = wpabuf_alloc(ctx->n_pk + wpabuf_len(ct));
  if (!enc_ct)
    goto fail;
  wpabuf_put_data(enc_ct, enc, ctx->n_pk);
  wpabuf_put_buf(enc_ct, ct);

fail:
  forced_memzero(shared_secret, sizeof(shared_secret));
  hpke_free_context(ctx);
  wpabuf_free(ct);
  return enc_ct;
}


static int hpke_decap(struct hpke_context *ctx, const u8 *enc,
          size_t enc_ct_len, struct crypto_ec_key *sk_r,
          u8 *shared_secret)
{
  EVP_PKEY_CTX *pctx = NULL;
  struct wpabuf *pk_rm = NULL;
  size_t len;
  int res = -1;
  struct crypto_ec_key *pk_e = NULL;
  u8 *dhss = NULL;
  size_t dhss_len = 0;

  /* pkE = DeserializePublicKey(enc) */
  if (enc_ct_len < ctx->n_pk)
    return -1; /* not enough room for enc */
  if (enc[0] != 0x04)
    return -1; /* not in uncompressed form */
  len = (ctx->n_pk - 1) / 2;
  pk_e = crypto_ec_key_set_pub(ctx->iana_group, &enc[1],
             &enc[1 + len], len);
  if (!pk_e)
    return -1; /* invalid public key point */
  /* dh = DH(skR, pkE) */
  pctx = EVP_PKEY_CTX_new((EVP_PKEY *) sk_r, NULL);
  if (!pctx ||
      EVP_PKEY_derive_init(pctx) != 1 ||
      EVP_PKEY_derive_set_peer(pctx, (EVP_PKEY *) pk_e) != 1 ||
      EVP_PKEY_derive(pctx, NULL, &dhss_len) != 1 ||
      !(dhss = os_malloc(dhss_len)) ||
      EVP_PKEY_derive(pctx, dhss, &dhss_len) != 1 ||
      dhss_len > HPKE_MAX_SHARED_SECRET_LEN) {
    wpa_printf(MSG_INFO,
         "OpenSSL: hpke_decap: EVP_PKEY_derive failed (dhss_len=%zu): %s",
         dhss_len, ERR_error_string(ERR_get_error(), NULL));
    goto fail;
  }

  /* pkRm = SerializePublicKey(pk(skR)) */
  pk_rm = crypto_ec_key_get_pubkey_point(sk_r, 1);
  if (!pk_rm)
    goto fail;

  /* kem_context = concat(enc, pkRm) */
  /* shared_secret = ExtractAndExpand(dh, kem_context) */
  res = hpke_extract_and_expand(ctx, dhss, dhss_len, enc, ctx->n_pk,
              wpabuf_head(pk_rm),
              wpabuf_len(pk_rm), shared_secret);
fail:
  bin_clear_free(dhss, dhss_len);
  crypto_ec_key_deinit(pk_e);
  EVP_PKEY_CTX_free(pctx);
  wpabuf_free(pk_rm);
  return res;
}


static struct wpabuf *
hpke_aead_open(struct hpke_context *ctx, const u8 *aad, size_t aad_len,
         const u8 *ct, size_t ct_len)
{
  EVP_CIPHER_CTX *cctx;
  int len = 0;
  const u8 *tag;
  struct wpabuf *pt = NULL;

  if (ct_len < ctx->n_t)
    return NULL;
  tag = ct + ct_len - ctx->n_t;
  ct_len -= ctx->n_t;

  /* No need to xor in sequence number since we support only the
   * single-shot API, i.e., base_nonce can be used as-is. */

  cctx = EVP_CIPHER_CTX_new();
  if (!cctx ||
      EVP_DecryptInit_ex(cctx, ctx->cipher, NULL, ctx->key,
             ctx->base_nonce) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptInit_ex failed",
         __func__);
    goto fail;
  }
  if (aad && aad_len &&
      EVP_DecryptUpdate(cctx, NULL, &len, aad, aad_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptUpdate(AAD) failed",
         __func__);
    goto fail;
  }
  pt = wpabuf_alloc(ct_len + AES_BLOCK_SIZE);
  if (!pt)
    goto fail;
  if (EVP_DecryptUpdate(cctx, wpabuf_put(pt, 0), &len, ct, ct_len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptUpdate failed",
         __func__);
    goto fail;
  }
  wpabuf_put(pt, len);

  if (EVP_CIPHER_CTX_ctrl(cctx, EVP_CTRL_AEAD_SET_TAG, ctx->n_t,
        (void *) tag) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:Could not set tag",
         __func__);
    wpabuf_free(pt);
    pt = NULL;
    goto fail;
  }

  if (EVP_DecryptFinal(cctx, wpabuf_put(pt, 0), &len) != 1) {
    wpa_printf(MSG_INFO, "OpenSSL:%s:EVP_DecryptFinal failed",
         __func__);
    wpabuf_free(pt);
    pt = NULL;
  }
fail:
  EVP_CIPHER_CTX_free(cctx);
  return pt;
}


static struct wpabuf * hpke_base_open_int(enum hpke_kem_id kem_id,
            enum hpke_kdf_id kdf_id,
            enum hpke_aead_id aead_id,
            struct crypto_ec_key *own_priv,
            const u8 *info, size_t info_len,
            const u8 *aad, size_t aad_len,
            const u8 *enc_ct, size_t enc_ct_len)
{
  struct hpke_context *ctx;
  u8 shared_secret[HPKE_MAX_SHARED_SECRET_LEN];
  struct wpabuf *pt = NULL;

  ctx = hpke_get_context(kem_id, kdf_id, aead_id, own_priv);
  if (!ctx)
    return NULL;

  /* shared_secret = Decap(enc, skR) */
  if (hpke_decap(ctx, enc_ct, enc_ct_len, own_priv, shared_secret) < 0)
    goto fail;

  /* KeyScheduleR(mode_base, shared_secret, info,
   *              default_psk, default_psk_id) */
  if (hpke_key_schedule(ctx, shared_secret, info, info_len) < 0)
    goto fail;

  /* return ctx.Open(aad, ct) */
  pt = hpke_aead_open(ctx, aad, aad_len,
          &enc_ct[ctx->n_pk], enc_ct_len - ctx->n_pk);

fail:
  forced_memzero(shared_secret, sizeof(shared_secret));
  hpke_free_context(ctx);
  return pt;
}


#if OPENSSL_VERSION_NUMBER >= 0x30200000L

static bool hpke_set_suite(OSSL_HPKE_SUITE *suite,
         enum hpke_kem_id kem_id,
         enum hpke_kdf_id kdf_id,
         enum hpke_aead_id aead_id)
{
  os_memset(suite, 0, sizeof(*suite));

  switch (kem_id) {
  case HPKE_DHKEM_P256_HKDF_SHA256:
    suite->kem_id = OSSL_HPKE_KEM_ID_P256;
    break;
  case HPKE_DHKEM_P384_HKDF_SHA384:
    suite->kem_id = OSSL_HPKE_KEM_ID_P384;
    break;
  case HPKE_DHKEM_P521_HKDF_SHA512:
    suite->kem_id = OSSL_HPKE_KEM_ID_P521;
    break;
  default:
    return false;
  }

  switch (kdf_id) {
  case HPKE_KDF_HKDF_SHA256:
    suite->kdf_id = OSSL_HPKE_KDF_ID_HKDF_SHA256;
    break;
  case HPKE_KDF_HKDF_SHA384:
    suite->kdf_id = OSSL_HPKE_KDF_ID_HKDF_SHA384;
    break;
  case HPKE_KDF_HKDF_SHA512:
    suite->kdf_id = OSSL_HPKE_KDF_ID_HKDF_SHA512;
    break;
  default:
    return false;
  }

  switch (aead_id) {
  case HPKE_AEAD_AES_128_GCM:
    suite->aead_id = OSSL_HPKE_AEAD_ID_AES_GCM_128;
    break;
  case HPKE_AEAD_AES_256_GCM:
    suite->aead_id = OSSL_HPKE_AEAD_ID_AES_GCM_256;
    break;
  default:
    return false;
  }

  if (!OSSL_HPKE_suite_check(*suite)) {
    wpa_printf(MSG_INFO,
         "OpenSSL: HPKE suite kem_id=%d kdf_id=%d aead_id=%d not supported",
         kem_id, kdf_id, aead_id);
    return false;
  }

  return true;
}


struct wpabuf * hpke_base_seal(enum hpke_kem_id kem_id,
             enum hpke_kdf_id kdf_id,
             enum hpke_aead_id aead_id,
             struct crypto_ec_key *peer_pub,
             const u8 *info, size_t info_len,
             const u8 *aad, size_t aad_len,
             const u8 *pt, size_t pt_len)
{
  OSSL_HPKE_SUITE suite;
  OSSL_HPKE_CTX *ctx = NULL;
  struct wpabuf *res = NULL, *buf, *pub = NULL;
  size_t enc_len, ct_len;
  int group;

  group = crypto_ec_key_group(peer_pub);
  if (group == 28 || group == 29 || group == 30) {
    /* Use the internal routines for the special DPP use case with
     * brainpool curves, */
    return hpke_base_seal_int(kem_id, kdf_id, aead_id, peer_pub,
            info, info_len, aad, aad_len,
            pt, pt_len);
  }


  if (!hpke_set_suite(&suite, kem_id, kdf_id, aead_id))
    return NULL;

  enc_len = OSSL_HPKE_get_public_encap_size(suite);
  ct_len = OSSL_HPKE_get_ciphertext_size(suite, pt_len);
  buf = wpabuf_alloc(enc_len + ct_len);
  if (!buf)
    goto out;

  pub = crypto_ec_key_get_pubkey_point(peer_pub, 1);
  if (!pub)
    goto out;

  ctx = OSSL_HPKE_CTX_new(OSSL_HPKE_MODE_BASE, suite,
        OSSL_HPKE_ROLE_SENDER, NULL, NULL);
  if (!ctx)
    goto out;

  if (OSSL_HPKE_encap(ctx, wpabuf_put(buf, 0), &enc_len,
          wpabuf_head(pub), wpabuf_len(pub),
          info, info_len) != 1) {
    wpa_printf(MSG_DEBUG, "OpenSSL: OSSL_HPKE_encap failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto out;
  }
  wpabuf_put(buf, enc_len);

  if (OSSL_HPKE_seal(ctx, wpabuf_put(buf, 0), &ct_len, aad, aad_len,
         pt, pt_len) != 1) {
    wpa_printf(MSG_DEBUG, "OpenSSL: OSSL_HPKE_seal failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto out;
  }
  wpabuf_put(buf, ct_len);
  res = buf;
  buf = NULL;

out:
  OSSL_HPKE_CTX_free(ctx);
  wpabuf_free(buf);
  wpabuf_free(pub);
  return res;
}


struct wpabuf * hpke_base_open(enum hpke_kem_id kem_id,
             enum hpke_kdf_id kdf_id,
             enum hpke_aead_id aead_id,
             struct crypto_ec_key *own_priv,
             const u8 *info, size_t info_len,
             const u8 *aad, size_t aad_len,
             const u8 *enc_ct, size_t enc_ct_len)
{
  OSSL_HPKE_SUITE suite;
  OSSL_HPKE_CTX *ctx;
  struct wpabuf *buf = NULL, *res = NULL;
  size_t len, enc_len;
  int group;

  group = crypto_ec_key_group(own_priv);
  if (group == 28 || group == 29 || group == 30) {
    /* Use the internal routines for the special DPP use case with
     * brainpool curves, */
    return hpke_base_open_int(kem_id, kdf_id, aead_id, own_priv,
            info, info_len, aad, aad_len,
            enc_ct, enc_ct_len);
  }

  if (!hpke_set_suite(&suite, kem_id, kdf_id, aead_id))
    return NULL;

  enc_len = OSSL_HPKE_get_public_encap_size(suite);
  if (enc_ct_len < enc_len) {
    wpa_printf(MSG_DEBUG, "OpenSSL: Too short HPKE enc_ct data");
    return NULL;
  }

  ctx = OSSL_HPKE_CTX_new(OSSL_HPKE_MODE_BASE, suite,
        OSSL_HPKE_ROLE_RECEIVER, NULL, NULL);
  if (!ctx)
    goto out;

  if (OSSL_HPKE_decap(ctx, enc_ct, enc_len, (EVP_PKEY *) own_priv,
          info, info_len) != 1) {
    wpa_printf(MSG_DEBUG, "OpenSSL: OSSL_HPKE_decap failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto out;
  }

  len = enc_ct_len;
  buf = wpabuf_alloc(len);
  if (!buf)
    goto out;

  if (OSSL_HPKE_open(ctx, wpabuf_put(buf, 0), &len, aad, aad_len,
         enc_ct + enc_len, enc_ct_len - enc_len) != 1) {
    wpa_printf(MSG_DEBUG, "OpenSSL: OSSL_HPKE_open failed: %s",
         ERR_error_string(ERR_get_error(), NULL));
    goto out;
  }

  wpabuf_put(buf, len);
  res = buf;
  buf = NULL;

out:
  OSSL_HPKE_CTX_free(ctx);
  wpabuf_free(buf);
  return res;
}

#else /* OpenSSL < 3.2 */

struct wpabuf * hpke_base_seal(enum hpke_kem_id kem_id,
             enum hpke_kdf_id kdf_id,
             enum hpke_aead_id aead_id,
             struct crypto_ec_key *peer_pub,
             const u8 *info, size_t info_len,
             const u8 *aad, size_t aad_len,
             const u8 *pt, size_t pt_len)
{
  return hpke_base_seal_int(kem_id, kdf_id, aead_id, peer_pub,
          info, info_len, aad, aad_len, pt, pt_len);
}


struct wpabuf * hpke_base_open(enum hpke_kem_id kem_id,
             enum hpke_kdf_id kdf_id,
             enum hpke_aead_id aead_id,
             struct crypto_ec_key *own_priv,
             const u8 *info, size_t info_len,
             const u8 *aad, size_t aad_len,
             const u8 *enc_ct, size_t enc_ct_len)
{
  return hpke_base_open_int(kem_id, kdf_id, aead_id, own_priv,
          info, info_len, aad, aad_len,
          enc_ct, enc_ct_len);
}

#endif /* OpenSSL < 3.2 */

#endif /* CONFIG_DPP3 */


void crypto_unload(void)
{
  openssl_unload_legacy_provider();
  openssl_unload_default_provider();
}

Coverage Report

Created: 2026-06-09 06:10