/src/libressl/crypto/evp/e_aes.c

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/* $OpenBSD: e_aes.c,v 1.46 2022/08/04 08:06:48 jsing Exp $ */
/* ====================================================================
 * Copyright (c) 2001-2011 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 */

#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_AES
#include <openssl/aes.h>
#include <openssl/err.h>
#include <openssl/evp.h>

#include "evp_locl.h"
#include "modes_lcl.h"

typedef struct {
  AES_KEY ks;
  block128_f block;
  union {
    cbc128_f cbc;
    ctr128_f ctr;
  } stream;
} EVP_AES_KEY;

typedef struct {
  AES_KEY ks;   /* AES key schedule to use */
  int key_set;    /* Set if key initialised */
  int iv_set;   /* Set if an iv is set */
  GCM128_CONTEXT gcm;
  unsigned char *iv;  /* Temporary IV store */
  int ivlen;    /* IV length */
  int taglen;
  int iv_gen;   /* It is OK to generate IVs */
  int tls_aad_len;  /* TLS AAD length */
  ctr128_f ctr;
} EVP_AES_GCM_CTX;

typedef struct {
  AES_KEY ks1, ks2; /* AES key schedules to use */
  XTS128_CONTEXT xts;
  void (*stream)(const unsigned char *in, unsigned char *out,
      size_t length, const AES_KEY *key1, const AES_KEY *key2,
      const unsigned char iv[16]);
} EVP_AES_XTS_CTX;

typedef struct {
  AES_KEY ks;   /* AES key schedule to use */
  int key_set;    /* Set if key initialised */
  int iv_set;   /* Set if an iv is set */
  int tag_set;    /* Set if tag is valid */
  int len_set;    /* Set if message length set */
  int L, M;   /* L and M parameters from RFC3610 */
  CCM128_CONTEXT ccm;
  ccm128_f str;
} EVP_AES_CCM_CTX;

#define MAXBITCHUNK ((size_t)1<<(sizeof(size_t)*8-4))

#ifdef VPAES_ASM
int vpaes_set_encrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);
int vpaes_set_decrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);

void vpaes_encrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);
void vpaes_decrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);

void vpaes_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char *ivec, int enc);
#endif
#ifdef BSAES_ASM
void bsaes_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char ivec[16], int enc);
void bsaes_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
    size_t len, const AES_KEY *key, const unsigned char ivec[16]);
void bsaes_xts_encrypt(const unsigned char *inp, unsigned char *out,
    size_t len, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);
void bsaes_xts_decrypt(const unsigned char *inp, unsigned char *out,
    size_t len, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);
#endif
#ifdef AES_CTR_ASM
void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
    size_t blocks, const AES_KEY *key,
    const unsigned char ivec[AES_BLOCK_SIZE]);
#endif
#ifdef AES_XTS_ASM
void AES_xts_encrypt(const char *inp, char *out, size_t len,
    const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]);
void AES_xts_decrypt(const char *inp, char *out, size_t len,
    const AES_KEY *key1, const AES_KEY *key2, const unsigned char iv[16]);
#endif

#if defined(AES_ASM) &&       (  \
  ((defined(__i386) || defined(__i386__)  || \
    defined(_M_IX86)) && defined(OPENSSL_IA32_SSE2))|| \
  defined(__x86_64) || defined(__x86_64__)  || \
  defined(_M_AMD64) || defined(_M_X64)  || \
  defined(__INTEL__)        )

#include "x86_arch.h"

#ifdef VPAES_ASM
#define VPAES_CAPABLE (OPENSSL_cpu_caps() & CPUCAP_MASK_SSSE3)
#endif
#ifdef BSAES_ASM
#define BSAES_CAPABLE VPAES_CAPABLE
#endif
/*
 * AES-NI section
 */
#define AESNI_CAPABLE (OPENSSL_cpu_caps() & CPUCAP_MASK_AESNI)

int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);
int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
    AES_KEY *key);

void aesni_encrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);
void aesni_decrypt(const unsigned char *in, unsigned char *out,
    const AES_KEY *key);

void aesni_ecb_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, int enc);
void aesni_cbc_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key, unsigned char *ivec, int enc);

void aesni_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char *ivec);

void aesni_xts_encrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);

void aesni_xts_decrypt(const unsigned char *in, unsigned char *out,
    size_t length, const AES_KEY *key1, const AES_KEY *key2,
    const unsigned char iv[16]);

void aesni_ccm64_encrypt_blocks (const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char ivec[16],
    unsigned char cmac[16]);

void aesni_ccm64_decrypt_blocks (const unsigned char *in, unsigned char *out,
    size_t blocks, const void *key, const unsigned char ivec[16],
    unsigned char cmac[16]);

static int
aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  int ret, mode;
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  mode = ctx->cipher->flags & EVP_CIPH_MODE;
  if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) &&
      !enc) {
    ret = aesni_set_decrypt_key(key, ctx->key_len * 8,
        ctx->cipher_data);
    dat->block = (block128_f)aesni_decrypt;
    dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
        (cbc128_f)aesni_cbc_encrypt : NULL;
  } else {
    ret = aesni_set_encrypt_key(key, ctx->key_len * 8,
        ctx->cipher_data);
    dat->block = (block128_f)aesni_encrypt;
    if (mode == EVP_CIPH_CBC_MODE)
      dat->stream.cbc = (cbc128_f)aesni_cbc_encrypt;
    else if (mode == EVP_CIPH_CTR_MODE)
      dat->stream.ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
    else
      dat->stream.cbc = NULL;
  }

  if (ret < 0) {
    EVPerror(EVP_R_AES_KEY_SETUP_FAILED);
    return 0;
  }

  return 1;
}

static int
aesni_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  aesni_cbc_encrypt(in, out, len, ctx->cipher_data, ctx->iv,
      ctx->encrypt);

  return 1;
}

static int
aesni_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  size_t  bl = ctx->cipher->block_size;

  if (len < bl)
    return 1;

  aesni_ecb_encrypt(in, out, len, ctx->cipher_data, ctx->encrypt);

  return 1;
}

static int
aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;
  if (key) {
    aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
    CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
        (block128_f)aesni_encrypt);
    gctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
    /* If we have an iv can set it directly, otherwise use
     * saved IV.
     */
    if (iv == NULL && gctx->iv_set)
      iv = gctx->iv;
    if (iv) {
      CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
      gctx->iv_set = 1;
    }
    gctx->key_set = 1;
  } else {
    /* If key set use IV, otherwise copy */
    if (gctx->key_set)
      CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
    else
      memcpy(gctx->iv, iv, gctx->ivlen);
    gctx->iv_set = 1;
    gctx->iv_gen = 0;
  }
  return 1;
}

static int
aesni_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;

  if (key) {
    /* key_len is two AES keys */
    if (enc) {
      aesni_set_encrypt_key(key, ctx->key_len * 4,
          &xctx->ks1);
      xctx->xts.block1 = (block128_f)aesni_encrypt;
      xctx->stream = aesni_xts_encrypt;
    } else {
      aesni_set_decrypt_key(key, ctx->key_len * 4,
          &xctx->ks1);
      xctx->xts.block1 = (block128_f)aesni_decrypt;
      xctx->stream = aesni_xts_decrypt;
    }

    aesni_set_encrypt_key(key + ctx->key_len / 2,
        ctx->key_len * 4, &xctx->ks2);
    xctx->xts.block2 = (block128_f)aesni_encrypt;

    xctx->xts.key1 = &xctx->ks1;
  }

  if (iv) {
    xctx->xts.key2 = &xctx->ks2;
    memcpy(ctx->iv, iv, 16);
  }

  return 1;
}

static int
aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_CCM_CTX *cctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;
  if (key) {
    aesni_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
    CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
        &cctx->ks, (block128_f)aesni_encrypt);
    cctx->str = enc ? (ccm128_f)aesni_ccm64_encrypt_blocks :
        (ccm128_f)aesni_ccm64_decrypt_blocks;
    cctx->key_set = 1;
  }
  if (iv) {
    memcpy(ctx->iv, iv, 15 - cctx->L);
    cctx->iv_set = 1;
  }
  return 1;
}

#endif

static int
aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  int ret, mode;
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  mode = ctx->cipher->flags & EVP_CIPH_MODE;
  if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) &&
      !enc)
#ifdef BSAES_CAPABLE
    if (BSAES_CAPABLE && mode == EVP_CIPH_CBC_MODE) {
      ret = AES_set_decrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)AES_decrypt;
      dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt;
    } else
#endif
#ifdef VPAES_CAPABLE
    if (VPAES_CAPABLE) {
      ret = vpaes_set_decrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)vpaes_decrypt;
      dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
          (cbc128_f)vpaes_cbc_encrypt : NULL;
    } else
#endif
    {
      ret = AES_set_decrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)AES_decrypt;
      dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
          (cbc128_f)AES_cbc_encrypt : NULL;
    } else
#ifdef BSAES_CAPABLE
    if (BSAES_CAPABLE && mode == EVP_CIPH_CTR_MODE) {
      ret = AES_set_encrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)AES_encrypt;
      dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks;
    } else
#endif
#ifdef VPAES_CAPABLE
    if (VPAES_CAPABLE) {
      ret = vpaes_set_encrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)vpaes_encrypt;
      dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
          (cbc128_f)vpaes_cbc_encrypt : NULL;
    } else
#endif
    {
      ret = AES_set_encrypt_key(key, ctx->key_len * 8,
          &dat->ks);
      dat->block = (block128_f)AES_encrypt;
      dat->stream.cbc = mode == EVP_CIPH_CBC_MODE ?
          (cbc128_f)AES_cbc_encrypt : NULL;
#ifdef AES_CTR_ASM
      if (mode == EVP_CIPH_CTR_MODE)
        dat->stream.ctr = (ctr128_f)AES_ctr32_encrypt;
#endif
    }

  if (ret < 0) {
    EVPerror(EVP_R_AES_KEY_SETUP_FAILED);
    return 0;
  }

  return 1;
}

static int
aes_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  if (dat->stream.cbc)
    (*dat->stream.cbc)(in, out, len, &dat->ks, ctx->iv,
        ctx->encrypt);
  else if (ctx->encrypt)
    CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv,
        dat->block);
  else
    CRYPTO_cbc128_decrypt(in, out, len, &dat->ks, ctx->iv,
        dat->block);

  return 1;
}

static int
aes_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  size_t  bl = ctx->cipher->block_size;
  size_t  i;
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  if (len < bl)
    return 1;

  for (i = 0, len -= bl; i <= len; i += bl)
    (*dat->block)(in + i, out + i, &dat->ks);

  return 1;
}

static int
aes_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
      dat->block);
  return 1;
}

static int
aes_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  CRYPTO_cfb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
      ctx->encrypt, dat->block);
  return 1;
}

static int
aes_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  CRYPTO_cfb128_8_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num,
      ctx->encrypt, dat->block);
  return 1;
}

static int
aes_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
    CRYPTO_cfb128_1_encrypt(in, out, len, &dat->ks, ctx->iv,
        &ctx->num, ctx->encrypt, dat->block);
    return 1;
  }

  while (len >= MAXBITCHUNK) {
    CRYPTO_cfb128_1_encrypt(in, out, MAXBITCHUNK*8, &dat->ks,
        ctx->iv, &ctx->num, ctx->encrypt, dat->block);
    len -= MAXBITCHUNK;
  }
  if (len)
    CRYPTO_cfb128_1_encrypt(in, out, len*8, &dat->ks,
        ctx->iv, &ctx->num, ctx->encrypt, dat->block);

  return 1;
}

static int
aes_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  unsigned int num = ctx->num;
  EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;

  if (dat->stream.ctr)
    CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks,
        ctx->iv, ctx->buf, &num, dat->stream.ctr);
  else
    CRYPTO_ctr128_encrypt(in, out, len, &dat->ks,
        ctx->iv, ctx->buf, &num, dat->block);
  ctx->num = (size_t)num;
  return 1;
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cbc = {
  .nid = NID_aes_128_cbc,
  .block_size = 16,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cbc = {
  .nid = NID_aes_128_cbc,
  .block_size = 16,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cbc(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_cbc : &aes_128_cbc;
#else
  return &aes_128_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ecb = {
  .nid = NID_aes_128_ecb,
  .block_size = 16,
  .key_len = 16,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ecb = {
  .nid = NID_aes_128_ecb,
  .block_size = 16,
  .key_len = 16,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ecb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_ecb : &aes_128_ecb;
#else
  return &aes_128_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ofb = {
  .nid = NID_aes_128_ofb128,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ofb = {
  .nid = NID_aes_128_ofb128,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ofb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_ofb : &aes_128_ofb;
#else
  return &aes_128_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb = {
  .nid = NID_aes_128_cfb128,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb = {
  .nid = NID_aes_128_cfb128,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_cfb : &aes_128_cfb;
#else
  return &aes_128_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb1 = {
  .nid = NID_aes_128_cfb1,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb1 = {
  .nid = NID_aes_128_cfb1,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb1(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_cfb1 : &aes_128_cfb1;
#else
  return &aes_128_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_cfb8 = {
  .nid = NID_aes_128_cfb8,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_cfb8 = {
  .nid = NID_aes_128_cfb8,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_cfb8(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_cfb8 : &aes_128_cfb8;
#else
  return &aes_128_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ctr = {
  .nid = NID_aes_128_ctr,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_128_ctr = {
  .nid = NID_aes_128_ctr,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_128_ctr(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_ctr : &aes_128_ctr;
#else
  return &aes_128_ctr;
#endif
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cbc = {
  .nid = NID_aes_192_cbc,
  .block_size = 16,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cbc = {
  .nid = NID_aes_192_cbc,
  .block_size = 16,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cbc(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_cbc : &aes_192_cbc;
#else
  return &aes_192_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ecb = {
  .nid = NID_aes_192_ecb,
  .block_size = 16,
  .key_len = 24,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ecb = {
  .nid = NID_aes_192_ecb,
  .block_size = 16,
  .key_len = 24,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ecb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_ecb : &aes_192_ecb;
#else
  return &aes_192_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ofb = {
  .nid = NID_aes_192_ofb128,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ofb = {
  .nid = NID_aes_192_ofb128,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ofb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_ofb : &aes_192_ofb;
#else
  return &aes_192_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb = {
  .nid = NID_aes_192_cfb128,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb = {
  .nid = NID_aes_192_cfb128,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_cfb : &aes_192_cfb;
#else
  return &aes_192_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb1 = {
  .nid = NID_aes_192_cfb1,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb1 = {
  .nid = NID_aes_192_cfb1,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb1(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_cfb1 : &aes_192_cfb1;
#else
  return &aes_192_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_cfb8 = {
  .nid = NID_aes_192_cfb8,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_cfb8 = {
  .nid = NID_aes_192_cfb8,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_cfb8(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_cfb8 : &aes_192_cfb8;
#else
  return &aes_192_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ctr = {
  .nid = NID_aes_192_ctr,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_192_ctr = {
  .nid = NID_aes_192_ctr,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_192_ctr(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_ctr : &aes_192_ctr;
#else
  return &aes_192_ctr;
#endif
}


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cbc = {
  .nid = NID_aes_256_cbc,
  .block_size = 16,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cbc = {
  .nid = NID_aes_256_cbc,
  .block_size = 16,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CBC_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cbc_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cbc(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_cbc : &aes_256_cbc;
#else
  return &aes_256_cbc;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ecb = {
  .nid = NID_aes_256_ecb,
  .block_size = 16,
  .key_len = 32,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aesni_init_key,
  .do_cipher = aesni_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ecb = {
  .nid = NID_aes_256_ecb,
  .block_size = 16,
  .key_len = 32,
  .iv_len = 0,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_ECB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ecb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ecb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_ecb : &aes_256_ecb;
#else
  return &aes_256_ecb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ofb = {
  .nid = NID_aes_256_ofb128,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ofb = {
  .nid = NID_aes_256_ofb128,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_OFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ofb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ofb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_ofb : &aes_256_ofb;
#else
  return &aes_256_ofb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb = {
  .nid = NID_aes_256_cfb128,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb = {
  .nid = NID_aes_256_cfb128,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_cfb : &aes_256_cfb;
#else
  return &aes_256_cfb;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb1 = {
  .nid = NID_aes_256_cfb1,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb1 = {
  .nid = NID_aes_256_cfb1,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb1_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb1(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_cfb1 : &aes_256_cfb1;
#else
  return &aes_256_cfb1;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_cfb8 = {
  .nid = NID_aes_256_cfb8,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_cfb8 = {
  .nid = NID_aes_256_cfb8,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CFB_MODE,
  .init = aes_init_key,
  .do_cipher = aes_cfb8_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_cfb8(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_cfb8 : &aes_256_cfb8;
#else
  return &aes_256_cfb8;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ctr = {
  .nid = NID_aes_256_ctr,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aesni_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};
#endif

static const EVP_CIPHER aes_256_ctr = {
  .nid = NID_aes_256_ctr,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 16,
  .flags = EVP_CIPH_CTR_MODE,
  .init = aes_init_key,
  .do_cipher = aes_ctr_cipher,
  .ctx_size = sizeof(EVP_AES_KEY),
};

const EVP_CIPHER *
EVP_aes_256_ctr(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_ctr : &aes_256_ctr;
#else
  return &aes_256_ctr;
#endif
}

static int
aes_gcm_cleanup(EVP_CIPHER_CTX *c)
{
  EVP_AES_GCM_CTX *gctx = c->cipher_data;

  if (gctx->iv != c->iv)
    free(gctx->iv);
  explicit_bzero(gctx, sizeof(*gctx));
  return 1;
}

/* increment counter (64-bit int) by 1 */
static void
ctr64_inc(unsigned char *counter)
{
  int n = 8;
  unsigned char  c;

  do {
    --n;
    c = counter[n];
    ++c;
    counter[n] = c;
    if (c)
      return;
  } while (n);
}

static int
aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
  EVP_AES_GCM_CTX *gctx = c->cipher_data;

  switch (type) {
  case EVP_CTRL_INIT:
    gctx->key_set = 0;
    gctx->iv_set = 0;
    if (c->cipher->iv_len == 0) {
      EVPerror(EVP_R_INVALID_IV_LENGTH);
      return 0;
    }
    gctx->ivlen = c->cipher->iv_len;
    gctx->iv = c->iv;
    gctx->taglen = -1;
    gctx->iv_gen = 0;
    gctx->tls_aad_len = -1;
    return 1;

  case EVP_CTRL_GCM_SET_IVLEN:
    if (arg <= 0)
      return 0;
    /* Allocate memory for IV if needed */
    if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen)) {
      if (gctx->iv != c->iv)
        free(gctx->iv);
      gctx->iv = malloc(arg);
      if (!gctx->iv)
        return 0;
    }
    gctx->ivlen = arg;
    return 1;

  case EVP_CTRL_GCM_SET_TAG:
    if (arg <= 0 || arg > 16 || c->encrypt)
      return 0;
    memcpy(c->buf, ptr, arg);
    gctx->taglen = arg;
    return 1;

  case EVP_CTRL_GCM_GET_TAG:
    if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
      return 0;
    memcpy(ptr, c->buf, arg);
    return 1;

  case EVP_CTRL_GCM_SET_IV_FIXED:
    /* Special case: -1 length restores whole IV */
    if (arg == -1) {
      memcpy(gctx->iv, ptr, gctx->ivlen);
      gctx->iv_gen = 1;
      return 1;
    }
    /* Fixed field must be at least 4 bytes and invocation field
     * at least 8.
     */
    if ((arg < 4) || (gctx->ivlen - arg) < 8)
      return 0;
    if (arg)
      memcpy(gctx->iv, ptr, arg);
    if (c->encrypt)
      arc4random_buf(gctx->iv + arg, gctx->ivlen - arg);
    gctx->iv_gen = 1;
    return 1;

  case EVP_CTRL_GCM_IV_GEN:
    if (gctx->iv_gen == 0 || gctx->key_set == 0)
      return 0;
    CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
    if (arg <= 0 || arg > gctx->ivlen)
      arg = gctx->ivlen;
    memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
    /* Invocation field will be at least 8 bytes in size and
     * so no need to check wrap around or increment more than
     * last 8 bytes.
     */
    ctr64_inc(gctx->iv + gctx->ivlen - 8);
    gctx->iv_set = 1;
    return 1;

  case EVP_CTRL_GCM_SET_IV_INV:
    if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt)
      return 0;
    memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
    CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
    gctx->iv_set = 1;
    return 1;

  case EVP_CTRL_AEAD_TLS1_AAD:
    /* Save the AAD for later use */
    if (arg != 13)
      return 0;
    memcpy(c->buf, ptr, arg);
    gctx->tls_aad_len = arg;
    {
      unsigned int len = c->buf[arg - 2] << 8 |
          c->buf[arg - 1];

      /* Correct length for explicit IV */
      if (len < EVP_GCM_TLS_EXPLICIT_IV_LEN)
        return 0;
      len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;

      /* If decrypting correct for tag too */
      if (!c->encrypt) {
        if (len < EVP_GCM_TLS_TAG_LEN)
          return 0;
        len -= EVP_GCM_TLS_TAG_LEN;
      }
      c->buf[arg - 2] = len >> 8;
      c->buf[arg - 1] = len & 0xff;
    }
    /* Extra padding: tag appended to record */
    return EVP_GCM_TLS_TAG_LEN;

  case EVP_CTRL_COPY:
      {
    EVP_CIPHER_CTX *out = ptr;
    EVP_AES_GCM_CTX *gctx_out = out->cipher_data;

    if (gctx->gcm.key) {
      if (gctx->gcm.key != &gctx->ks)
        return 0;
      gctx_out->gcm.key = &gctx_out->ks;
    }

    if (gctx->iv == c->iv) {
      gctx_out->iv = out->iv;
    } else {
      if ((gctx_out->iv = calloc(1, gctx->ivlen)) == NULL)
        return 0;
      memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
    }
    return 1;
      }

  default:
    return -1;

  }
}

static ctr128_f
aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx,
    const unsigned char *key, size_t key_len)
{
#ifdef BSAES_CAPABLE
  if (BSAES_CAPABLE) {
    AES_set_encrypt_key(key, key_len * 8, aes_key);
    CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
    return (ctr128_f)bsaes_ctr32_encrypt_blocks;
  } else
#endif
#ifdef VPAES_CAPABLE
  if (VPAES_CAPABLE) {
    vpaes_set_encrypt_key(key, key_len * 8, aes_key);
    CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt);
    return NULL;
  } else
#endif
    (void)0; /* terminate potentially open 'else' */

  AES_set_encrypt_key(key, key_len * 8, aes_key);
  CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
#ifdef AES_CTR_ASM
  return (ctr128_f)AES_ctr32_encrypt;
#else
  return NULL;
#endif
}

static int
aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;
  if (key) {
    gctx->ctr = aes_gcm_set_key(&gctx->ks, &gctx->gcm,
        key, ctx->key_len);

    /* If we have an iv can set it directly, otherwise use
     * saved IV.
     */
    if (iv == NULL && gctx->iv_set)
      iv = gctx->iv;
    if (iv) {
      CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
      gctx->iv_set = 1;
    }
    gctx->key_set = 1;
  } else {
    /* If key set use IV, otherwise copy */
    if (gctx->key_set)
      CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
    else
      memcpy(gctx->iv, iv, gctx->ivlen);
    gctx->iv_set = 1;
    gctx->iv_gen = 0;
  }
  return 1;
}

/* Handle TLS GCM packet format. This consists of the last portion of the IV
 * followed by the payload and finally the tag. On encrypt generate IV,
 * encrypt payload and write the tag. On verify retrieve IV, decrypt payload
 * and verify tag.
 */

static int
aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
  int rv = -1;

  /* Encrypt/decrypt must be performed in place */
  if (out != in ||
      len < (EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN))
    return -1;

  /* Set IV from start of buffer or generate IV and write to start
   * of buffer.
   */
  if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ?
      EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV,
      EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
    goto err;

  /* Use saved AAD */
  if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len))
    goto err;

  /* Fix buffer and length to point to payload */
  in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
  out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
  len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
  if (ctx->encrypt) {
    /* Encrypt payload */
    if (gctx->ctr) {
      if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in, out,
          len, gctx->ctr))
        goto err;
    } else {
      if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
        goto err;
    }
    out += len;

    /* Finally write tag */
    CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN);
    rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
  } else {
    /* Decrypt */
    if (gctx->ctr) {
      if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in, out,
          len, gctx->ctr))
        goto err;
    } else {
      if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
        goto err;
    }
    /* Retrieve tag */
    CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, EVP_GCM_TLS_TAG_LEN);

    /* If tag mismatch wipe buffer */
    if (memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN)) {
      explicit_bzero(out, len);
      goto err;
    }
    rv = len;
  }

err:
  gctx->iv_set = 0;
  gctx->tls_aad_len = -1;
  return rv;
}

static int
aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_GCM_CTX *gctx = ctx->cipher_data;

  /* If not set up, return error */
  if (!gctx->key_set)
    return -1;

  if (gctx->tls_aad_len >= 0)
    return aes_gcm_tls_cipher(ctx, out, in, len);

  if (!gctx->iv_set)
    return -1;

  if (in) {
    if (out == NULL) {
      if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
        return -1;
    } else if (ctx->encrypt) {
      if (gctx->ctr) {
        if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm,
            in, out, len, gctx->ctr))
          return -1;
      } else {
        if (CRYPTO_gcm128_encrypt(&gctx->gcm,
            in, out, len))
          return -1;
      }
    } else {
      if (gctx->ctr) {
        if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm,
            in, out, len, gctx->ctr))
          return -1;
      } else {
        if (CRYPTO_gcm128_decrypt(&gctx->gcm,
            in, out, len))
          return -1;
      }
    }
    return len;
  } else {
    if (!ctx->encrypt) {
      if (gctx->taglen < 0)
        return -1;
      if (CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf,
          gctx->taglen) != 0)
        return -1;
      gctx->iv_set = 0;
      return 0;
    }
    CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
    gctx->taglen = 16;

    /* Don't reuse the IV */
    gctx->iv_set = 0;
    return 0;
  }

}

#define CUSTOM_FLAGS \
    ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \
      EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_ALWAYS_CALL_INIT | \
      EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY )


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_gcm = {
  .nid = NID_aes_128_gcm,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aesni_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_128_gcm = {
  .nid = NID_aes_128_gcm,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aes_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_gcm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_gcm : &aes_128_gcm;
#else
  return &aes_128_gcm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_gcm = {
  .nid = NID_aes_192_gcm,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aesni_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_192_gcm = {
  .nid = NID_aes_192_gcm,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aes_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_192_gcm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_gcm : &aes_192_gcm;
#else
  return &aes_192_gcm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_gcm = {
  .nid = NID_aes_256_gcm,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aesni_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};
#endif

static const EVP_CIPHER aes_256_gcm = {
  .nid = NID_aes_256_gcm,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 12,
  .flags = EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS | EVP_CIPH_GCM_MODE,
  .init = aes_gcm_init_key,
  .do_cipher = aes_gcm_cipher,
  .cleanup = aes_gcm_cleanup,
  .ctx_size = sizeof(EVP_AES_GCM_CTX),
  .ctrl = aes_gcm_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_gcm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_gcm : &aes_256_gcm;
#else
  return &aes_256_gcm;
#endif
}

static int
aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
  EVP_AES_XTS_CTX *xctx = c->cipher_data;

  switch (type) {
  case EVP_CTRL_INIT:
    /*
     * key1 and key2 are used as an indicator both key and IV
     * are set
     */
    xctx->xts.key1 = NULL;
    xctx->xts.key2 = NULL;
    return 1;

  case EVP_CTRL_COPY:
      {
    EVP_CIPHER_CTX *out = ptr;
    EVP_AES_XTS_CTX *xctx_out = out->cipher_data;

    if (xctx->xts.key1) {
      if (xctx->xts.key1 != &xctx->ks1)
        return 0;
      xctx_out->xts.key1 = &xctx_out->ks1;
    }
    if (xctx->xts.key2) {
      if (xctx->xts.key2 != &xctx->ks2)
        return 0;
      xctx_out->xts.key2 = &xctx_out->ks2;
    }
    return 1;
      }
  }
  return -1;
}

static int
aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;

  if (key) do {
#ifdef AES_XTS_ASM
    xctx->stream = enc ? AES_xts_encrypt : AES_xts_decrypt;
#else
    xctx->stream = NULL;
#endif
    /* key_len is two AES keys */
#ifdef BSAES_CAPABLE
    if (BSAES_CAPABLE)
      xctx->stream = enc ? bsaes_xts_encrypt :
          bsaes_xts_decrypt;
    else
#endif
#ifdef VPAES_CAPABLE
    if (VPAES_CAPABLE) {
      if (enc) {
        vpaes_set_encrypt_key(key, ctx->key_len * 4,
            &xctx->ks1);
        xctx->xts.block1 = (block128_f)vpaes_encrypt;
      } else {
        vpaes_set_decrypt_key(key, ctx->key_len * 4,
            &xctx->ks1);
        xctx->xts.block1 = (block128_f)vpaes_decrypt;
      }

      vpaes_set_encrypt_key(key + ctx->key_len / 2,
          ctx->key_len * 4, &xctx->ks2);
      xctx->xts.block2 = (block128_f)vpaes_encrypt;

      xctx->xts.key1 = &xctx->ks1;
      break;
    } else
#endif
      (void)0; /* terminate potentially open 'else' */

    if (enc) {
      AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
      xctx->xts.block1 = (block128_f)AES_encrypt;
    } else {
      AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
      xctx->xts.block1 = (block128_f)AES_decrypt;
    }

    AES_set_encrypt_key(key + ctx->key_len / 2,
        ctx->key_len * 4, &xctx->ks2);
    xctx->xts.block2 = (block128_f)AES_encrypt;

    xctx->xts.key1 = &xctx->ks1;
  } while (0);

  if (iv) {
    xctx->xts.key2 = &xctx->ks2;
    memcpy(ctx->iv, iv, 16);
  }

  return 1;
}

static int
aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_XTS_CTX *xctx = ctx->cipher_data;

  if (!xctx->xts.key1 || !xctx->xts.key2)
    return 0;
  if (!out || !in || len < AES_BLOCK_SIZE)
    return 0;

  if (xctx->stream)
    (*xctx->stream)(in, out, len, xctx->xts.key1, xctx->xts.key2,
        ctx->iv);
  else if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len,
      ctx->encrypt))
    return 0;
  return 1;
}

#define aes_xts_cleanup NULL

#define XTS_FLAGS \
    ( EVP_CIPH_FLAG_DEFAULT_ASN1 | EVP_CIPH_CUSTOM_IV | \
      EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY )


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_xts = {
  .nid = NID_aes_128_xts,
  .block_size = 1,
  .key_len = 2 * 16,
  .iv_len = 16,
  .flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
  .init = aesni_xts_init_key,
  .do_cipher = aes_xts_cipher,
  .cleanup = aes_xts_cleanup,
  .ctx_size = sizeof(EVP_AES_XTS_CTX),
  .ctrl = aes_xts_ctrl,
};
#endif

static const EVP_CIPHER aes_128_xts = {
  .nid = NID_aes_128_xts,
  .block_size = 1,
  .key_len = 2 * 16,
  .iv_len = 16,
  .flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
  .init = aes_xts_init_key,
  .do_cipher = aes_xts_cipher,
  .cleanup = aes_xts_cleanup,
  .ctx_size = sizeof(EVP_AES_XTS_CTX),
  .ctrl = aes_xts_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_xts(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_xts : &aes_128_xts;
#else
  return &aes_128_xts;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_xts = {
  .nid = NID_aes_256_xts,
  .block_size = 1,
  .key_len = 2 * 32,
  .iv_len = 16,
  .flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
  .init = aesni_xts_init_key,
  .do_cipher = aes_xts_cipher,
  .cleanup = aes_xts_cleanup,
  .ctx_size = sizeof(EVP_AES_XTS_CTX),
  .ctrl = aes_xts_ctrl,
};
#endif

static const EVP_CIPHER aes_256_xts = {
  .nid = NID_aes_256_xts,
  .block_size = 1,
  .key_len = 2 * 32,
  .iv_len = 16,
  .flags = XTS_FLAGS | EVP_CIPH_XTS_MODE,
  .init = aes_xts_init_key,
  .do_cipher = aes_xts_cipher,
  .cleanup = aes_xts_cleanup,
  .ctx_size = sizeof(EVP_AES_XTS_CTX),
  .ctrl = aes_xts_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_xts(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_xts : &aes_256_xts;
#else
  return &aes_256_xts;
#endif
}

static int
aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
  EVP_AES_CCM_CTX *cctx = c->cipher_data;

  switch (type) {
  case EVP_CTRL_INIT:
    cctx->key_set = 0;
    cctx->iv_set = 0;
    cctx->L = 8;
    cctx->M = 12;
    cctx->tag_set = 0;
    cctx->len_set = 0;
    return 1;

  case EVP_CTRL_CCM_SET_IVLEN:
    arg = 15 - arg;

  case EVP_CTRL_CCM_SET_L:
    if (arg < 2 || arg > 8)
      return 0;
    cctx->L = arg;
    return 1;

  case EVP_CTRL_CCM_SET_TAG:
    if ((arg & 1) || arg < 4 || arg > 16)
      return 0;
    if ((c->encrypt && ptr) || (!c->encrypt && !ptr))
      return 0;
    if (ptr) {
      cctx->tag_set = 1;
      memcpy(c->buf, ptr, arg);
    }
    cctx->M = arg;
    return 1;

  case EVP_CTRL_CCM_GET_TAG:
    if (!c->encrypt || !cctx->tag_set)
      return 0;
    if (!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg))
      return 0;
    cctx->tag_set = 0;
    cctx->iv_set = 0;
    cctx->len_set = 0;
    return 1;

  case EVP_CTRL_COPY:
      {
    EVP_CIPHER_CTX *out = ptr;
    EVP_AES_CCM_CTX *cctx_out = out->cipher_data;

    if (cctx->ccm.key) {
      if (cctx->ccm.key != &cctx->ks)
        return 0;
      cctx_out->ccm.key = &cctx_out->ks;
    }
    return 1;
      }

  default:
    return -1;
  }
}

static int
aes_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_CCM_CTX *cctx = ctx->cipher_data;

  if (!iv && !key)
    return 1;
  if (key) do {
#ifdef VPAES_CAPABLE
    if (VPAES_CAPABLE) {
      vpaes_set_encrypt_key(key, ctx->key_len*8, &cctx->ks);
      CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
          &cctx->ks, (block128_f)vpaes_encrypt);
      cctx->str = NULL;
      cctx->key_set = 1;
      break;
    }
#endif
    AES_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
    CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
        &cctx->ks, (block128_f)AES_encrypt);
    cctx->str = NULL;
    cctx->key_set = 1;
  } while (0);
  if (iv) {
    memcpy(ctx->iv, iv, 15 - cctx->L);
    cctx->iv_set = 1;
  }
  return 1;
}

static int
aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t len)
{
  EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
  CCM128_CONTEXT *ccm = &cctx->ccm;

  /* If not set up, return error */
  if (!cctx->iv_set && !cctx->key_set)
    return -1;
  if (!ctx->encrypt && !cctx->tag_set)
    return -1;

  if (!out) {
    if (!in) {
      if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,
          len))
        return -1;
      cctx->len_set = 1;
      return len;
    }
    /* If have AAD need message length */
    if (!cctx->len_set && len)
      return -1;
    CRYPTO_ccm128_aad(ccm, in, len);
    return len;
  }
  /* EVP_*Final() doesn't return any data */
  if (!in)
    return 0;
  /* If not set length yet do it */
  if (!cctx->len_set) {
    if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
      return -1;
    cctx->len_set = 1;
  }
  if (ctx->encrypt) {
    if (cctx->str ? CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len,
        cctx->str) : CRYPTO_ccm128_encrypt(ccm, in, out, len))
      return -1;
    cctx->tag_set = 1;
    return len;
  } else {
    int rv = -1;
    if (cctx->str ? !CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len,
        cctx->str) : !CRYPTO_ccm128_decrypt(ccm, in, out, len)) {
      unsigned char tag[16];
      if (CRYPTO_ccm128_tag(ccm, tag, cctx->M)) {
        if (!memcmp(tag, ctx->buf, cctx->M))
          rv = len;
      }
    }
    if (rv == -1)
      explicit_bzero(out, len);
    cctx->iv_set = 0;
    cctx->tag_set = 0;
    cctx->len_set = 0;
    return rv;
  }

}

#define aes_ccm_cleanup NULL


#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_128_ccm = {
  .nid = NID_aes_128_ccm,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aesni_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_128_ccm = {
  .nid = NID_aes_128_ccm,
  .block_size = 1,
  .key_len = 16,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aes_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_128_ccm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_128_ccm : &aes_128_ccm;
#else
  return &aes_128_ccm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_192_ccm = {
  .nid = NID_aes_192_ccm,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aesni_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_192_ccm = {
  .nid = NID_aes_192_ccm,
  .block_size = 1,
  .key_len = 24,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aes_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_192_ccm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_192_ccm : &aes_192_ccm;
#else
  return &aes_192_ccm;
#endif
}

#ifdef AESNI_CAPABLE
static const EVP_CIPHER aesni_256_ccm = {
  .nid = NID_aes_256_ccm,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aesni_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};
#endif

static const EVP_CIPHER aes_256_ccm = {
  .nid = NID_aes_256_ccm,
  .block_size = 1,
  .key_len = 32,
  .iv_len = 12,
  .flags = CUSTOM_FLAGS | EVP_CIPH_CCM_MODE,
  .init = aes_ccm_init_key,
  .do_cipher = aes_ccm_cipher,
  .cleanup = aes_ccm_cleanup,
  .ctx_size = sizeof(EVP_AES_CCM_CTX),
  .ctrl = aes_ccm_ctrl,
};

const EVP_CIPHER *
EVP_aes_256_ccm(void)
{
#ifdef AESNI_CAPABLE
  return AESNI_CAPABLE ? &aesni_256_ccm : &aes_256_ccm;
#else
  return &aes_256_ccm;
#endif
}

#define EVP_AEAD_AES_GCM_TAG_LEN 16

struct aead_aes_gcm_ctx {
  union {
    double align;
    AES_KEY ks;
  } ks;
  GCM128_CONTEXT gcm;
  ctr128_f ctr;
  unsigned char tag_len;
};

static int
aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len,
    size_t tag_len)
{
  struct aead_aes_gcm_ctx *gcm_ctx;
  const size_t key_bits = key_len * 8;

  /* EVP_AEAD_CTX_init should catch this. */
  if (key_bits != 128 && key_bits != 256) {
    EVPerror(EVP_R_BAD_KEY_LENGTH);
    return 0;
  }

  if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH)
    tag_len = EVP_AEAD_AES_GCM_TAG_LEN;

  if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) {
    EVPerror(EVP_R_TAG_TOO_LARGE);
    return 0;
  }

  if ((gcm_ctx = calloc(1, sizeof(struct aead_aes_gcm_ctx))) == NULL)
    return 0;

#ifdef AESNI_CAPABLE
  if (AESNI_CAPABLE) {
    aesni_set_encrypt_key(key, key_bits, &gcm_ctx->ks.ks);
    CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks,
        (block128_f)aesni_encrypt);
    gcm_ctx->ctr = (ctr128_f) aesni_ctr32_encrypt_blocks;
  } else
#endif
  {
    gcm_ctx->ctr = aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm,
        key, key_len);
  }
  gcm_ctx->tag_len = tag_len;
  ctx->aead_state = gcm_ctx;

  return 1;
}

static void
aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx)
{
  struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;

  freezero(gcm_ctx, sizeof(*gcm_ctx));
}

static int
aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
  const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
  GCM128_CONTEXT gcm;
  size_t bulk = 0;

  if (max_out_len < in_len + gcm_ctx->tag_len) {
    EVPerror(EVP_R_BUFFER_TOO_SMALL);
    return 0;
  }

  memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));

  if (nonce_len == 0) {
    EVPerror(EVP_R_INVALID_IV_LENGTH);
    return 0;
  }
  CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len);

  if (ad_len > 0 && CRYPTO_gcm128_aad(&gcm, ad, ad_len))
    return 0;

  if (gcm_ctx->ctr) {
    if (CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk,
        in_len - bulk, gcm_ctx->ctr))
      return 0;
  } else {
    if (CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk,
        in_len - bulk))
      return 0;
  }

  CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len);
  *out_len = in_len + gcm_ctx->tag_len;

  return 1;
}

static int
aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, unsigned char *out, size_t *out_len,
    size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
    const unsigned char *in, size_t in_len, const unsigned char *ad,
    size_t ad_len)
{
  const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
  unsigned char tag[EVP_AEAD_AES_GCM_TAG_LEN];
  GCM128_CONTEXT gcm;
  size_t plaintext_len;
  size_t bulk = 0;

  if (in_len < gcm_ctx->tag_len) {
    EVPerror(EVP_R_BAD_DECRYPT);
    return 0;
  }

  plaintext_len = in_len - gcm_ctx->tag_len;

  if (max_out_len < plaintext_len) {
    EVPerror(EVP_R_BUFFER_TOO_SMALL);
    return 0;
  }

  memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));

  if (nonce_len == 0) {
    EVPerror(EVP_R_INVALID_IV_LENGTH);
    return 0;
  }
  CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len);

  if (CRYPTO_gcm128_aad(&gcm, ad, ad_len))
    return 0;

  if (gcm_ctx->ctr) {
    if (CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk,
        in_len - bulk - gcm_ctx->tag_len, gcm_ctx->ctr))
      return 0;
  } else {
    if (CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk,
        in_len - bulk - gcm_ctx->tag_len))
      return 0;
  }

  CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len);
  if (timingsafe_memcmp(tag, in + plaintext_len, gcm_ctx->tag_len) != 0) {
    EVPerror(EVP_R_BAD_DECRYPT);
    return 0;
  }

  *out_len = plaintext_len;

  return 1;
}

static const EVP_AEAD aead_aes_128_gcm = {
  .key_len = 16,
  .nonce_len = 12,
  .overhead = EVP_AEAD_AES_GCM_TAG_LEN,
  .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN,

  .init = aead_aes_gcm_init,
  .cleanup = aead_aes_gcm_cleanup,
  .seal = aead_aes_gcm_seal,
  .open = aead_aes_gcm_open,
};

static const EVP_AEAD aead_aes_256_gcm = {
  .key_len = 32,
  .nonce_len = 12,
  .overhead = EVP_AEAD_AES_GCM_TAG_LEN,
  .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN,

  .init = aead_aes_gcm_init,
  .cleanup = aead_aes_gcm_cleanup,
  .seal = aead_aes_gcm_seal,
  .open = aead_aes_gcm_open,
};

const EVP_AEAD *
EVP_aead_aes_128_gcm(void)
{
  return &aead_aes_128_gcm;
}

const EVP_AEAD *
EVP_aead_aes_256_gcm(void)
{
  return &aead_aes_256_gcm;
}

typedef struct {
  union {
    double align;
    AES_KEY ks;
  } ks;
  unsigned char *iv;
} EVP_AES_WRAP_CTX;

static int
aes_wrap_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
  EVP_AES_WRAP_CTX *wctx = (EVP_AES_WRAP_CTX *)ctx->cipher_data;

  if (iv == NULL && key == NULL)
    return 1;

  if (key != NULL) {
    if (ctx->encrypt)
      AES_set_encrypt_key(key, 8 * ctx->key_len,
          &wctx->ks.ks);
    else
      AES_set_decrypt_key(key, 8 * ctx->key_len,
          &wctx->ks.ks);

    if (iv == NULL)
      wctx->iv = NULL;
  }

  if (iv != NULL) {
    memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
    wctx->iv = ctx->iv;
  }

  return 1;
}

static int
aes_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inlen)
{
  EVP_AES_WRAP_CTX *wctx = ctx->cipher_data;
  int ret;

  if (in == NULL)
    return 0;

  if (inlen % 8 != 0)
    return -1;
  if (ctx->encrypt && inlen < 8)
    return -1;
  if (!ctx->encrypt && inlen < 16)
    return -1;
  if (inlen > INT_MAX)
    return -1;

  if (out == NULL) {
    if (ctx->encrypt)
      return inlen + 8;
    else
      return inlen - 8;
  }

  if (ctx->encrypt)
    ret = AES_wrap_key(&wctx->ks.ks, wctx->iv, out, in,
        (unsigned int)inlen);
  else
    ret = AES_unwrap_key(&wctx->ks.ks, wctx->iv, out, in,
        (unsigned int)inlen);

  return ret != 0 ? ret : -1;
}

static int
aes_wrap_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
{
  EVP_AES_WRAP_CTX *wctx = c->cipher_data;

  switch (type) {
  case EVP_CTRL_COPY:
      {
    EVP_CIPHER_CTX *out = ptr;
    EVP_AES_WRAP_CTX *wctx_out = out->cipher_data;

    if (wctx->iv != NULL) {
      if (c->iv != wctx->iv)
        return 0;

      wctx_out->iv = out->iv;
    }

    return 1;
      }
  }

  return -1;
}

#define WRAP_FLAGS \
    ( EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | \
      EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_FLAG_DEFAULT_ASN1 | \
      EVP_CIPH_CUSTOM_COPY )

static const EVP_CIPHER aes_128_wrap = {
  .nid = NID_id_aes128_wrap,
  .block_size = 8,
  .key_len = 16,
  .iv_len = 8,
  .flags = WRAP_FLAGS,
  .init = aes_wrap_init_key,
  .do_cipher = aes_wrap_cipher,
  .cleanup = NULL,
  .ctx_size = sizeof(EVP_AES_WRAP_CTX),
  .set_asn1_parameters = NULL,
  .get_asn1_parameters = NULL,
  .ctrl = aes_wrap_ctrl,
  .app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_128_wrap(void)
{
  return &aes_128_wrap;
}

static const EVP_CIPHER aes_192_wrap = {
  .nid = NID_id_aes192_wrap,
  .block_size = 8,
  .key_len = 24,
  .iv_len = 8,
  .flags = WRAP_FLAGS,
  .init = aes_wrap_init_key,
  .do_cipher = aes_wrap_cipher,
  .cleanup = NULL,
  .ctx_size = sizeof(EVP_AES_WRAP_CTX),
  .set_asn1_parameters = NULL,
  .get_asn1_parameters = NULL,
  .ctrl = aes_wrap_ctrl,
  .app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_192_wrap(void)
{
  return &aes_192_wrap;
}

static const EVP_CIPHER aes_256_wrap = {
  .nid = NID_id_aes256_wrap,
  .block_size = 8,
  .key_len = 32,
  .iv_len = 8,
  .flags = WRAP_FLAGS,
  .init = aes_wrap_init_key,
  .do_cipher = aes_wrap_cipher,
  .cleanup = NULL,
  .ctx_size = sizeof(EVP_AES_WRAP_CTX),
  .set_asn1_parameters = NULL,
  .get_asn1_parameters = NULL,
  .ctrl = aes_wrap_ctrl,
  .app_data = NULL,
};

const EVP_CIPHER *
EVP_aes_256_wrap(void)
{
  return &aes_256_wrap;
}

#endif

Coverage Report

Created: 2022-08-24 06:30