Esempi in C++ (Cpp) per aes_gcm_set_key

Esempio n. 1

File: e_aes.c Progetto: LeSuisse/libressl-salsa20

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;
}

Esempio n. 2

File: e_aes.c Progetto: LeSuisse/libressl-salsa20

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) {
		EVPerr(EVP_F_AEAD_AES_GCM_INIT, 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) {
		EVPerr(EVP_F_AEAD_AES_GCM_INIT, EVP_R_TAG_TOO_LARGE);
		return 0;
	}

	gcm_ctx = malloc(sizeof(struct aead_aes_gcm_ctx));
	if (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;
}

Esempio n. 3

File: e_aes.c Progetto: xin3liang/platform_external_chromium_org_third_party_boringssl_src

static int aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                             size_t key_len, size_t tag_len) {
  struct aead_aes_gcm_ctx *gcm_ctx;
  const size_t key_bits = key_len * 8;

  if (key_bits != 128 && key_bits != 256) {
    OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_init, CIPHER_R_BAD_KEY_LENGTH);
    return 0; /* EVP_AEAD_CTX_init should catch this. */
  }

  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) {
    OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_init, CIPHER_R_TAG_TOO_LARGE);
    return 0;
  }

  gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx));
  if (gcm_ctx == NULL) {
    return 0;
  }

  if (aesni_capable()) {
    aesni_set_encrypt_key(key, key_len * 8, &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 {
    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;
}