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Make EVP_CIPHER_CTX_copy work in GCM mode.

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PR#3272
(cherry picked from commit 370bf1d708)
This commit is contained in:
ZNV 2014-06-29 22:01:28 +01:00 committed by Dr. Stephen Henson
parent 15de0f609c
commit 14183e50e7
1 changed files with 18 additions and 1 deletions
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19
crypto/evp/e_aes.c
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@ -1284,6 +1284,22 @@ static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
/* 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->iv == c->iv)
gctx_out->iv = out->iv;
else
{
gctx_out->iv = OPENSSL_malloc(gctx->ivlen);
if (!gctx_out->iv)
return 0;
memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
}
return 1;
}
default:
return -1;
@ -1673,7 +1689,8 @@ static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
#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_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \
| EVP_CIPH_CUSTOM_COPY)
BLOCK_CIPHER_custom(NID_aes,128,1,12,gcm,GCM,
EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)