/src/gnutls/lib/nettle/mac.c

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/*
 * Copyright (C) 2008-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GNUTLS.
 *
 * The GNUTLS library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>
 *
 */

/* This file provides the backend hash/mac API for nettle.
 */

#include "gnutls_int.h"
#include <hash_int.h>
#include "errors.h"
#include <nettle/md5.h>
#include <nettle/md2.h>
#include <nettle/sha.h>
#include <nettle/sha3.h>
#include <nettle/hmac.h>
#include <nettle/umac.h>
#include <nettle/hkdf.h>
#include <nettle/pbkdf2.h>
#include <nettle/cmac.h>
#if ENABLE_GOST
# include "gost/hmac-gost.h"
# ifndef HAVE_NETTLE_GOST28147_SET_KEY
#  include "gost/gost28147.h"
# endif
# include "gost/cmac.h"
#endif
#include <nettle/gcm.h>

typedef void (*update_func)(void *, size_t, const uint8_t *);
typedef void (*digest_func)(void *, size_t, uint8_t *);
typedef void (*set_key_func)(void *, size_t, const uint8_t *);
typedef void (*set_nonce_func)(void *, size_t, const uint8_t *);

static int wrap_nettle_hash_init(gnutls_digest_algorithm_t algo, void **_ctx);

struct md5_sha1_ctx {
  struct md5_ctx md5;
  struct sha1_ctx sha1;
};

struct gmac_ctx {
  unsigned int pos;
  uint8_t buffer[GCM_BLOCK_SIZE];
  struct gcm_key key;
  struct gcm_ctx ctx;
  nettle_cipher_func *encrypt;
  union {
    struct aes128_ctx aes128;
    struct aes192_ctx aes192;
    struct aes256_ctx aes256;
  } cipher;
};

struct nettle_hash_ctx {
  union {
    struct md5_ctx md5;
    struct sha224_ctx sha224;
    struct sha256_ctx sha256;
    struct sha384_ctx sha384;
    struct sha512_ctx sha512;
    struct sha3_224_ctx sha3_224;
    struct sha3_256_ctx sha3_256;
    struct sha3_384_ctx sha3_384;
    struct sha3_512_ctx sha3_512;
    struct sha1_ctx sha1;
    struct md2_ctx md2;
    struct md5_sha1_ctx md5_sha1;
#if ENABLE_GOST
    struct gosthash94cp_ctx gosthash94cp;
    struct streebog256_ctx streebog256;
    struct streebog512_ctx streebog512;
#endif
  } ctx;
  void *ctx_ptr;
  gnutls_digest_algorithm_t algo;
  size_t length;
  update_func update;
  digest_func digest;
};

struct nettle_mac_ctx {
  union {
    struct hmac_md5_ctx md5;
    struct hmac_sha224_ctx sha224;
    struct hmac_sha256_ctx sha256;
    struct hmac_sha384_ctx sha384;
    struct hmac_sha512_ctx sha512;
    struct hmac_sha1_ctx sha1;
#if ENABLE_GOST
    struct hmac_gosthash94cp_ctx gosthash94cp;
    struct hmac_streebog256_ctx streebog256;
    struct hmac_streebog512_ctx streebog512;
    struct gost28147_imit_ctx gost28147_imit;
    struct cmac_magma_ctx magma;
    struct cmac_kuznyechik_ctx kuznyechik;
#endif
    struct umac96_ctx umac96;
    struct umac128_ctx umac128;
    struct cmac_aes128_ctx cmac128;
    struct cmac_aes256_ctx cmac256;
    struct gmac_ctx gmac;
  } ctx;

  void *ctx_ptr;
  gnutls_mac_algorithm_t algo;
  size_t length;
  update_func update;
  digest_func digest;
  set_key_func set_key;
  set_nonce_func set_nonce;
};

#if ENABLE_GOST
static void
_wrap_gost28147_imit_set_key_tc26z(void *ctx, size_t len, const uint8_t * key)
{
  gost28147_imit_set_param(ctx, &gost28147_param_TC26_Z);
  gost28147_imit_set_key(ctx, len, key);
}

static void _wrap_cmac_magma_set_key(void *ctx, size_t len, const uint8_t * key)
{
  cmac_magma_set_key(ctx, key);
}

static void
_wrap_cmac_kuznyechik_set_key(void *ctx, size_t len, const uint8_t * key)
{
  cmac_kuznyechik_set_key(ctx, key);
}
#endif

static void _wrap_umac96_set_key(void *ctx, size_t len, const uint8_t * key)
{
  if (unlikely(len != 16))
    abort();
  umac96_set_key(ctx, key);
}

static void _wrap_umac128_set_key(void *ctx, size_t len, const uint8_t * key)
{
  if (unlikely(len != 16))
    abort();
  umac128_set_key(ctx, key);
}

static void _wrap_cmac128_set_key(void *ctx, size_t len, const uint8_t * key)
{
  if (unlikely(len != 16))
    abort();
  cmac_aes128_set_key(ctx, key);
}

static void _wrap_cmac256_set_key(void *ctx, size_t len, const uint8_t * key)
{
  if (unlikely(len != 32))
    abort();
  cmac_aes256_set_key(ctx, key);
}

static void
_wrap_gmac_aes128_set_key(void *_ctx, size_t len, const uint8_t * key)
{
  struct gmac_ctx *ctx = _ctx;

  if (unlikely(len != 16))
    abort();
  aes128_set_encrypt_key(&ctx->cipher.aes128, key);
  gcm_set_key(&ctx->key, &ctx->cipher, ctx->encrypt);
  ctx->pos = 0;
}

static void
_wrap_gmac_aes192_set_key(void *_ctx, size_t len, const uint8_t * key)
{
  struct gmac_ctx *ctx = _ctx;

  if (unlikely(len != 24))
    abort();
  aes192_set_encrypt_key(&ctx->cipher.aes192, key);
  gcm_set_key(&ctx->key, &ctx->cipher, ctx->encrypt);
  ctx->pos = 0;
}

static void
_wrap_gmac_aes256_set_key(void *_ctx, size_t len, const uint8_t * key)
{
  struct gmac_ctx *ctx = _ctx;

  if (unlikely(len != 32))
    abort();
  aes256_set_encrypt_key(&ctx->cipher.aes256, key);
  gcm_set_key(&ctx->key, &ctx->cipher, ctx->encrypt);
  ctx->pos = 0;
}

static void _wrap_gmac_set_nonce(void *_ctx, size_t nonce_length,
         const uint8_t * nonce)
{
  struct gmac_ctx *ctx = _ctx;

  gcm_set_iv(&ctx->ctx, &ctx->key, nonce_length, nonce);
}

static void _wrap_gmac_update(void *_ctx, size_t length, const uint8_t * data)
{
  struct gmac_ctx *ctx = _ctx;

  if (ctx->pos + length < GCM_BLOCK_SIZE) {
    memcpy(&ctx->buffer[ctx->pos], data, length);
    ctx->pos += length;
    return;
  }

  if (ctx->pos) {
    memcpy(&ctx->buffer[ctx->pos], data, GCM_BLOCK_SIZE - ctx->pos);
    gcm_update(&ctx->ctx, &ctx->key, GCM_BLOCK_SIZE, ctx->buffer);
    data += GCM_BLOCK_SIZE - ctx->pos;
    length -= GCM_BLOCK_SIZE - ctx->pos;
  }

  if (length >= GCM_BLOCK_SIZE) {
    gcm_update(&ctx->ctx, &ctx->key,
         length / GCM_BLOCK_SIZE * GCM_BLOCK_SIZE, data);
    data += length / GCM_BLOCK_SIZE * GCM_BLOCK_SIZE;
    length %= GCM_BLOCK_SIZE;
  }

  memcpy(ctx->buffer, data, length);
  ctx->pos = length;
}

static void _wrap_gmac_digest(void *_ctx, size_t length, uint8_t * digest)
{
  struct gmac_ctx *ctx = _ctx;

  if (ctx->pos)
    gcm_update(&ctx->ctx, &ctx->key, ctx->pos, ctx->buffer);
  gcm_digest(&ctx->ctx, &ctx->key, &ctx->cipher, ctx->encrypt, length,
       digest);
  ctx->pos = 0;
}

static int _mac_ctx_init(gnutls_mac_algorithm_t algo,
       struct nettle_mac_ctx *ctx)
{
  /* Any FIPS140-2 related enforcement is performed on
   * gnutls_hash_init() and gnutls_hmac_init() */

  ctx->set_nonce = NULL;
  switch (algo) {
  case GNUTLS_MAC_MD5:
    ctx->update = (update_func) hmac_md5_update;
    ctx->digest = (digest_func) hmac_md5_digest;
    ctx->set_key = (set_key_func) hmac_md5_set_key;
    ctx->ctx_ptr = &ctx->ctx.md5;
    ctx->length = MD5_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_SHA1:
    ctx->update = (update_func) hmac_sha1_update;
    ctx->digest = (digest_func) hmac_sha1_digest;
    ctx->set_key = (set_key_func) hmac_sha1_set_key;
    ctx->ctx_ptr = &ctx->ctx.sha1;
    ctx->length = SHA1_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_SHA224:
    ctx->update = (update_func) hmac_sha224_update;
    ctx->digest = (digest_func) hmac_sha224_digest;
    ctx->set_key = (set_key_func) hmac_sha224_set_key;
    ctx->ctx_ptr = &ctx->ctx.sha224;
    ctx->length = SHA224_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_SHA256:
    ctx->update = (update_func) hmac_sha256_update;
    ctx->digest = (digest_func) hmac_sha256_digest;
    ctx->set_key = (set_key_func) hmac_sha256_set_key;
    ctx->ctx_ptr = &ctx->ctx.sha256;
    ctx->length = SHA256_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_SHA384:
    ctx->update = (update_func) hmac_sha384_update;
    ctx->digest = (digest_func) hmac_sha384_digest;
    ctx->set_key = (set_key_func) hmac_sha384_set_key;
    ctx->ctx_ptr = &ctx->ctx.sha384;
    ctx->length = SHA384_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_SHA512:
    ctx->update = (update_func) hmac_sha512_update;
    ctx->digest = (digest_func) hmac_sha512_digest;
    ctx->set_key = (set_key_func) hmac_sha512_set_key;
    ctx->ctx_ptr = &ctx->ctx.sha512;
    ctx->length = SHA512_DIGEST_SIZE;
    break;
#if ENABLE_GOST
  case GNUTLS_MAC_GOSTR_94:
    ctx->update = (update_func) hmac_gosthash94cp_update;
    ctx->digest = (digest_func) hmac_gosthash94cp_digest;
    ctx->set_key = (set_key_func) hmac_gosthash94cp_set_key;
    ctx->ctx_ptr = &ctx->ctx.gosthash94cp;
    ctx->length = GOSTHASH94CP_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_STREEBOG_256:
    ctx->update = (update_func) hmac_streebog256_update;
    ctx->digest = (digest_func) hmac_streebog256_digest;
    ctx->set_key = (set_key_func) hmac_streebog256_set_key;
    ctx->ctx_ptr = &ctx->ctx.streebog256;
    ctx->length = STREEBOG256_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_STREEBOG_512:
    ctx->update = (update_func) hmac_streebog512_update;
    ctx->digest = (digest_func) hmac_streebog512_digest;
    ctx->set_key = (set_key_func) hmac_streebog512_set_key;
    ctx->ctx_ptr = &ctx->ctx.streebog512;
    ctx->length = STREEBOG512_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_GOST28147_TC26Z_IMIT:
    ctx->update = (update_func) gost28147_imit_update;
    ctx->digest = (digest_func) gost28147_imit_digest;
    ctx->set_key = _wrap_gost28147_imit_set_key_tc26z;
    ctx->ctx_ptr = &ctx->ctx.gost28147_imit;
    ctx->length = GOST28147_IMIT_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_MAGMA_OMAC:
    ctx->update = (update_func) cmac_magma_update;
    ctx->digest = (digest_func) cmac_magma_digest;
    ctx->set_key = _wrap_cmac_magma_set_key;
    ctx->ctx_ptr = &ctx->ctx.magma;
    ctx->length = CMAC64_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_KUZNYECHIK_OMAC:
    ctx->update = (update_func) cmac_kuznyechik_update;
    ctx->digest = (digest_func) cmac_kuznyechik_digest;
    ctx->set_key = _wrap_cmac_kuznyechik_set_key;
    ctx->ctx_ptr = &ctx->ctx.kuznyechik;
    ctx->length = CMAC128_DIGEST_SIZE;
    break;
#endif
  case GNUTLS_MAC_UMAC_96:
    ctx->update = (update_func) umac96_update;
    ctx->digest = (digest_func) umac96_digest;
    ctx->set_key = _wrap_umac96_set_key;
    ctx->set_nonce = (set_nonce_func) umac96_set_nonce;
    ctx->ctx_ptr = &ctx->ctx.umac96;
    ctx->length = 12;
    break;
  case GNUTLS_MAC_UMAC_128:
    ctx->update = (update_func) umac128_update;
    ctx->digest = (digest_func) umac128_digest;
    ctx->set_key = _wrap_umac128_set_key;
    ctx->set_nonce = (set_nonce_func) umac128_set_nonce;
    ctx->ctx_ptr = &ctx->ctx.umac128;
    ctx->length = 16;
    break;
  case GNUTLS_MAC_AES_CMAC_128:
    ctx->update = (update_func) cmac_aes128_update;
    ctx->digest = (digest_func) cmac_aes128_digest;
    ctx->set_key = _wrap_cmac128_set_key;
    ctx->ctx_ptr = &ctx->ctx.cmac128;
    ctx->length = CMAC128_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_AES_CMAC_256:
    ctx->update = (update_func) cmac_aes256_update;
    ctx->digest = (digest_func) cmac_aes256_digest;
    ctx->set_key = _wrap_cmac256_set_key;
    ctx->ctx_ptr = &ctx->ctx.cmac256;
    ctx->length = CMAC128_DIGEST_SIZE;
    break;
  case GNUTLS_MAC_AES_GMAC_128:
    ctx->set_key = _wrap_gmac_aes128_set_key;
    ctx->set_nonce = _wrap_gmac_set_nonce;
    ctx->update = _wrap_gmac_update;
    ctx->digest = _wrap_gmac_digest;
    ctx->ctx_ptr = &ctx->ctx.gmac;
    ctx->length = GCM_DIGEST_SIZE;
    ctx->ctx.gmac.encrypt = (nettle_cipher_func *) aes128_encrypt;
    break;
  case GNUTLS_MAC_AES_GMAC_192:
    ctx->set_key = _wrap_gmac_aes192_set_key;
    ctx->set_nonce = _wrap_gmac_set_nonce;
    ctx->update = _wrap_gmac_update;
    ctx->digest = _wrap_gmac_digest;
    ctx->ctx_ptr = &ctx->ctx.gmac;
    ctx->length = GCM_DIGEST_SIZE;
    ctx->ctx.gmac.encrypt = (nettle_cipher_func *) aes192_encrypt;
    break;
  case GNUTLS_MAC_AES_GMAC_256:
    ctx->set_key = _wrap_gmac_aes256_set_key;
    ctx->set_nonce = _wrap_gmac_set_nonce;
    ctx->update = _wrap_gmac_update;
    ctx->digest = _wrap_gmac_digest;
    ctx->ctx_ptr = &ctx->ctx.gmac;
    ctx->length = GCM_DIGEST_SIZE;
    ctx->ctx.gmac.encrypt = (nettle_cipher_func *) aes256_encrypt;
    break;
  default:
    gnutls_assert();
    return GNUTLS_E_INVALID_REQUEST;
  }

  return 0;
}

static int wrap_nettle_mac_fast(gnutls_mac_algorithm_t algo,
        const void *nonce, size_t nonce_size,
        const void *key, size_t key_size,
        const void *text, size_t text_size,
        void *digest)
{
  struct nettle_mac_ctx ctx;
  int ret;

  ret = _mac_ctx_init(algo, &ctx);
  if (ret < 0)
    return gnutls_assert_val(ret);

  ctx.set_key(&ctx, key_size, key);
  if (ctx.set_nonce) {
    if (nonce == NULL || nonce_size == 0)
      return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);

    ctx.set_nonce(&ctx, nonce_size, nonce);
  }
  ctx.update(&ctx, text_size, text);
  ctx.digest(&ctx, ctx.length, digest);

  zeroize_temp_key(&ctx, sizeof(ctx));

  return 0;
}

static int wrap_nettle_mac_exists(gnutls_mac_algorithm_t algo)
{
  switch (algo) {
  case GNUTLS_MAC_MD5:
  case GNUTLS_MAC_SHA1:
  case GNUTLS_MAC_SHA224:
  case GNUTLS_MAC_SHA256:
  case GNUTLS_MAC_SHA384:
  case GNUTLS_MAC_SHA512:
  case GNUTLS_MAC_UMAC_96:
  case GNUTLS_MAC_UMAC_128:
  case GNUTLS_MAC_AES_CMAC_128:
  case GNUTLS_MAC_AES_CMAC_256:
  case GNUTLS_MAC_AES_GMAC_128:
  case GNUTLS_MAC_AES_GMAC_192:
  case GNUTLS_MAC_AES_GMAC_256:
#if ENABLE_GOST
  case GNUTLS_MAC_GOSTR_94:
  case GNUTLS_MAC_STREEBOG_256:
  case GNUTLS_MAC_STREEBOG_512:
  case GNUTLS_MAC_GOST28147_TC26Z_IMIT:
  case GNUTLS_MAC_MAGMA_OMAC:
  case GNUTLS_MAC_KUZNYECHIK_OMAC:
#endif
    return 1;
  default:
    return 0;
  }
}

static int wrap_nettle_mac_init(gnutls_mac_algorithm_t algo, void **_ctx)
{
  struct nettle_mac_ctx *ctx;
  int ret;

  ctx = gnutls_calloc(1, sizeof(struct nettle_mac_ctx));
  if (ctx == NULL) {
    gnutls_assert();
    return GNUTLS_E_MEMORY_ERROR;
  }

  ctx->algo = algo;

  ret = _mac_ctx_init(algo, ctx);
  if (ret < 0) {
    gnutls_free(ctx);
    return gnutls_assert_val(ret);
  }

  *_ctx = ctx;

  return 0;
}

static void *wrap_nettle_mac_copy(const void *_ctx)
{
  const struct nettle_mac_ctx *ctx = _ctx;
  struct nettle_mac_ctx *new_ctx;
  ptrdiff_t off = (uint8_t *) ctx->ctx_ptr - (uint8_t *) (&ctx->ctx);

  new_ctx = gnutls_calloc(1, sizeof(struct nettle_mac_ctx));
  if (new_ctx == NULL)
    return NULL;

  memcpy(new_ctx, ctx, sizeof(*ctx));
  new_ctx->ctx_ptr = (uint8_t *) & new_ctx->ctx + off;

  return new_ctx;
}

static int wrap_nettle_mac_set_key(void *_ctx, const void *key, size_t keylen)
{
  struct nettle_mac_ctx *ctx = _ctx;

  ctx->set_key(ctx->ctx_ptr, keylen, key);
  return 0;
}

static int
wrap_nettle_mac_set_nonce(void *_ctx, const void *nonce, size_t noncelen)
{
  struct nettle_mac_ctx *ctx = _ctx;

  if (ctx->set_nonce == NULL)
    return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);

  if (nonce == NULL || noncelen == 0)
    return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);

  ctx->set_nonce(ctx->ctx_ptr, noncelen, nonce);

  return GNUTLS_E_SUCCESS;
}

static int wrap_nettle_mac_update(void *_ctx, const void *text, size_t textsize)
{
  struct nettle_mac_ctx *ctx = _ctx;

  ctx->update(ctx->ctx_ptr, textsize, text);

  return GNUTLS_E_SUCCESS;
}

static int
wrap_nettle_mac_output(void *src_ctx, void *digest, size_t digestsize)
{
  struct nettle_mac_ctx *ctx;
  ctx = src_ctx;

  if (digestsize < ctx->length) {
    gnutls_assert();
    return GNUTLS_E_SHORT_MEMORY_BUFFER;
  }

  ctx->digest(ctx->ctx_ptr, digestsize, digest);

  return 0;
}

static void wrap_nettle_mac_deinit(void *hd)
{
  struct nettle_mac_ctx *ctx = hd;

  zeroize_temp_key(ctx, sizeof(*ctx));
  gnutls_free(ctx);
}

/* Hash functions 
 */
static int
wrap_nettle_hash_update(void *_ctx, const void *text, size_t textsize)
{
  struct nettle_hash_ctx *ctx = _ctx;

  ctx->update(ctx->ctx_ptr, textsize, text);

  return GNUTLS_E_SUCCESS;
}

static void wrap_nettle_hash_deinit(void *hd)
{
  gnutls_free(hd);
}

static int wrap_nettle_hash_exists(gnutls_digest_algorithm_t algo)
{
  switch (algo) {
  case GNUTLS_DIG_MD5:
  case GNUTLS_DIG_SHA1:
  case GNUTLS_DIG_MD5_SHA1:

  case GNUTLS_DIG_SHA224:
  case GNUTLS_DIG_SHA256:
  case GNUTLS_DIG_SHA384:
  case GNUTLS_DIG_SHA512:

#ifdef NETTLE_SHA3_FIPS202
  case GNUTLS_DIG_SHA3_224:
  case GNUTLS_DIG_SHA3_256:
  case GNUTLS_DIG_SHA3_384:
  case GNUTLS_DIG_SHA3_512:
#endif

  case GNUTLS_DIG_SHAKE_128:
  case GNUTLS_DIG_SHAKE_256:

  case GNUTLS_DIG_MD2:
  case GNUTLS_DIG_RMD160:

#if ENABLE_GOST
  case GNUTLS_DIG_GOSTR_94:
  case GNUTLS_DIG_STREEBOG_256:
  case GNUTLS_DIG_STREEBOG_512:
#endif
    return 1;
  default:
    return 0;
  }
}

static void _md5_sha1_update(void *_ctx, size_t len, const uint8_t * data)
{
  struct md5_sha1_ctx *ctx = _ctx;

  md5_update(&ctx->md5, len, data);
  sha1_update(&ctx->sha1, len, data);
}

static void _md5_sha1_digest(void *_ctx, size_t len, uint8_t * digest)
{
  struct md5_sha1_ctx *ctx = _ctx;

  md5_digest(&ctx->md5, len <= MD5_DIGEST_SIZE ? len : MD5_DIGEST_SIZE,
       digest);

  if (len > MD5_DIGEST_SIZE)
    sha1_digest(&ctx->sha1, len - MD5_DIGEST_SIZE,
          digest + MD5_DIGEST_SIZE);
}

static int _ctx_init(gnutls_digest_algorithm_t algo,
         struct nettle_hash_ctx *ctx)
{
  /* Any FIPS140-2 related enforcement is performed on
   * gnutls_hash_init() and gnutls_hmac_init() */
  switch (algo) {
  case GNUTLS_DIG_MD5:
    md5_init(&ctx->ctx.md5);
    ctx->update = (update_func) md5_update;
    ctx->digest = (digest_func) md5_digest;
    ctx->ctx_ptr = &ctx->ctx.md5;
    ctx->length = MD5_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA1:
    sha1_init(&ctx->ctx.sha1);
    ctx->update = (update_func) sha1_update;
    ctx->digest = (digest_func) sha1_digest;
    ctx->ctx_ptr = &ctx->ctx.sha1;
    ctx->length = SHA1_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_MD5_SHA1:
    md5_init(&ctx->ctx.md5_sha1.md5);
    sha1_init(&ctx->ctx.md5_sha1.sha1);
    ctx->update = (update_func) _md5_sha1_update;
    ctx->digest = (digest_func) _md5_sha1_digest;
    ctx->ctx_ptr = &ctx->ctx.md5_sha1;
    ctx->length = MD5_DIGEST_SIZE + SHA1_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA224:
    sha224_init(&ctx->ctx.sha224);
    ctx->update = (update_func) sha224_update;
    ctx->digest = (digest_func) sha224_digest;
    ctx->ctx_ptr = &ctx->ctx.sha224;
    ctx->length = SHA224_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA256:
    sha256_init(&ctx->ctx.sha256);
    ctx->update = (update_func) sha256_update;
    ctx->digest = (digest_func) sha256_digest;
    ctx->ctx_ptr = &ctx->ctx.sha256;
    ctx->length = SHA256_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA384:
    sha384_init(&ctx->ctx.sha384);
    ctx->update = (update_func) sha384_update;
    ctx->digest = (digest_func) sha384_digest;
    ctx->ctx_ptr = &ctx->ctx.sha384;
    ctx->length = SHA384_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA512:
    sha512_init(&ctx->ctx.sha512);
    ctx->update = (update_func) sha512_update;
    ctx->digest = (digest_func) sha512_digest;
    ctx->ctx_ptr = &ctx->ctx.sha512;
    ctx->length = SHA512_DIGEST_SIZE;
    break;
#ifdef NETTLE_SHA3_FIPS202
  case GNUTLS_DIG_SHA3_224:
    sha3_224_init(&ctx->ctx.sha3_224);
    ctx->update = (update_func) sha3_224_update;
    ctx->digest = (digest_func) sha3_224_digest;
    ctx->ctx_ptr = &ctx->ctx.sha3_224;
    ctx->length = SHA3_224_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA3_256:
    sha3_256_init(&ctx->ctx.sha3_256);
    ctx->update = (update_func) sha3_256_update;
    ctx->digest = (digest_func) sha3_256_digest;
    ctx->ctx_ptr = &ctx->ctx.sha3_256;
    ctx->length = SHA3_256_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA3_384:
    sha3_384_init(&ctx->ctx.sha3_384);
    ctx->update = (update_func) sha3_384_update;
    ctx->digest = (digest_func) sha3_384_digest;
    ctx->ctx_ptr = &ctx->ctx.sha3_384;
    ctx->length = SHA3_384_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_SHA3_512:
    sha3_512_init(&ctx->ctx.sha3_512);
    ctx->update = (update_func) sha3_512_update;
    ctx->digest = (digest_func) sha3_512_digest;
    ctx->ctx_ptr = &ctx->ctx.sha3_512;
    ctx->length = SHA3_512_DIGEST_SIZE;
    break;
#endif
  case GNUTLS_DIG_MD2:
    md2_init(&ctx->ctx.md2);
    ctx->update = (update_func) md2_update;
    ctx->digest = (digest_func) md2_digest;
    ctx->ctx_ptr = &ctx->ctx.md2;
    ctx->length = MD2_DIGEST_SIZE;
    break;
#if ENABLE_GOST
  case GNUTLS_DIG_GOSTR_94:
    gosthash94cp_init(&ctx->ctx.gosthash94cp);
    ctx->update = (update_func) gosthash94cp_update;
    ctx->digest = (digest_func) gosthash94cp_digest;
    ctx->ctx_ptr = &ctx->ctx.gosthash94cp;
    ctx->length = GOSTHASH94_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_STREEBOG_256:
    streebog256_init(&ctx->ctx.streebog256);
    ctx->update = (update_func) streebog256_update;
    ctx->digest = (digest_func) streebog256_digest;
    ctx->ctx_ptr = &ctx->ctx.streebog256;
    ctx->length = STREEBOG256_DIGEST_SIZE;
    break;
  case GNUTLS_DIG_STREEBOG_512:
    streebog512_init(&ctx->ctx.streebog512);
    ctx->update = (update_func) streebog512_update;
    ctx->digest = (digest_func) streebog512_digest;
    ctx->ctx_ptr = &ctx->ctx.streebog512;
    ctx->length = STREEBOG512_DIGEST_SIZE;
    break;
#endif
  default:
    gnutls_assert();
    return GNUTLS_E_INVALID_REQUEST;
  }

  return 0;
}

static int wrap_nettle_hash_fast(gnutls_digest_algorithm_t algo,
         const void *text, size_t text_size,
         void *digest)
{
  struct nettle_hash_ctx ctx;
  int ret;

  ret = _ctx_init(algo, &ctx);
  if (ret < 0)
    return gnutls_assert_val(ret);

  if (text_size > 0) {
    ctx.update(&ctx, text_size, text);
  }
  ctx.digest(&ctx, ctx.length, digest);
  zeroize_temp_key(&ctx, sizeof(ctx));

  return 0;
}

static int wrap_nettle_hash_init(gnutls_digest_algorithm_t algo, void **_ctx)
{
  struct nettle_hash_ctx *ctx;
  int ret;

  ctx = gnutls_malloc(sizeof(struct nettle_hash_ctx));
  if (ctx == NULL) {
    gnutls_assert();
    return GNUTLS_E_MEMORY_ERROR;
  }

  ctx->algo = algo;

  if ((ret = _ctx_init(algo, ctx)) < 0) {
    gnutls_assert();
    gnutls_free(ctx);
    return ret;
  }

  *_ctx = ctx;

  return 0;
}

static void *wrap_nettle_hash_copy(const void *_ctx)
{
  const struct nettle_hash_ctx *ctx = _ctx;
  struct nettle_hash_ctx *new_ctx;
  ptrdiff_t off = (uint8_t *) ctx->ctx_ptr - (uint8_t *) (&ctx->ctx);

  new_ctx = gnutls_calloc(1, sizeof(struct nettle_hash_ctx));
  if (new_ctx == NULL)
    return NULL;

  memcpy(new_ctx, ctx, sizeof(*ctx));
  new_ctx->ctx_ptr = (uint8_t *) & new_ctx->ctx + off;

  return new_ctx;
}

static int
wrap_nettle_hash_output(void *src_ctx, void *digest, size_t digestsize)
{
  struct nettle_hash_ctx *ctx;
  ctx = src_ctx;

  if (digestsize < ctx->length) {
    gnutls_assert();
    return GNUTLS_E_SHORT_MEMORY_BUFFER;
  }

  ctx->digest(ctx->ctx_ptr, digestsize, digest);

  return 0;
}

/* KDF functions based on MAC
 */
static int
wrap_nettle_hkdf_extract(gnutls_mac_algorithm_t mac,
       const void *key, size_t keysize,
       const void *salt, size_t saltsize, void *output)
{
  struct nettle_mac_ctx ctx;
  int ret;

  ret = _mac_ctx_init(mac, &ctx);
  if (ret < 0)
    return gnutls_assert_val(ret);

  ctx.set_key(&ctx, saltsize, salt);
  hkdf_extract(&ctx.ctx, ctx.update, ctx.digest, ctx.length,
         keysize, key, output);

  zeroize_temp_key(&ctx, sizeof(ctx));
  return 0;
}

static int
wrap_nettle_hkdf_expand(gnutls_mac_algorithm_t mac,
      const void *key, size_t keysize,
      const void *info, size_t infosize,
      void *output, size_t length)
{
  struct nettle_mac_ctx ctx;
  int ret;

  ret = _mac_ctx_init(mac, &ctx);
  if (ret < 0)
    return gnutls_assert_val(ret);

  /* RFC 5869 2.3: L must be <= 255 * HashLen */
  if (length > ctx.length * 255) {
    return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
  }

  ctx.set_key(&ctx, keysize, key);
  hkdf_expand(&ctx.ctx, ctx.update, ctx.digest, ctx.length,
        infosize, info, length, output);
  zeroize_temp_key(&ctx, sizeof(ctx));

  return 0;
}

static int
wrap_nettle_pbkdf2(gnutls_mac_algorithm_t mac,
       const void *key, size_t keysize,
       const void *salt, size_t saltsize,
       unsigned iter_count, void *output, size_t length)
{
  struct nettle_mac_ctx ctx;
  int ret;

  ret = _mac_ctx_init(mac, &ctx);
  if (ret < 0)
    return gnutls_assert_val(ret);

  ctx.set_key(&ctx, keysize, key);
  pbkdf2(&ctx.ctx, ctx.update, ctx.digest, ctx.length,
         iter_count, saltsize, salt, length, output);
  zeroize_temp_key(&ctx, sizeof(ctx));

  return 0;
}

gnutls_crypto_mac_st _gnutls_mac_ops = {
  .init = wrap_nettle_mac_init,
  .setkey = wrap_nettle_mac_set_key,
  .setnonce = wrap_nettle_mac_set_nonce,
  .hash = wrap_nettle_mac_update,
  .output = wrap_nettle_mac_output,
  .deinit = wrap_nettle_mac_deinit,
  .fast = wrap_nettle_mac_fast,
  .exists = wrap_nettle_mac_exists,
  .copy = wrap_nettle_mac_copy,
};

gnutls_crypto_digest_st _gnutls_digest_ops = {
  .init = wrap_nettle_hash_init,
  .hash = wrap_nettle_hash_update,
  .output = wrap_nettle_hash_output,
  .deinit = wrap_nettle_hash_deinit,
  .fast = wrap_nettle_hash_fast,
  .exists = wrap_nettle_hash_exists,
  .copy = wrap_nettle_hash_copy,
};

/* These names are clashing with nettle's name mangling. */
#undef hkdf_extract
#undef hkdf_expand
#undef pbkdf2
gnutls_crypto_kdf_st _gnutls_kdf_ops = {
  .hkdf_extract = wrap_nettle_hkdf_extract,
  .hkdf_expand = wrap_nettle_hkdf_expand,
  .pbkdf2 = wrap_nettle_pbkdf2,
};

Coverage Report

Created: 2023-03-26 07:33