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e_aes_cbc_hmac_sha1.c: handle zero-length payload and engage empty frag

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countermeasure.

PR: 2778
This commit is contained in:
Andy Polyakov 2012-04-15 14:14:22 +00:00
parent 26e6bac143
commit fc90e42c86
2 changed files with 11 additions and 5 deletions
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8
crypto/evp/e_aes_cbc_hmac_sha1.c
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@ -82,6 +82,8 @@ typedef struct
} aux;
} EVP_AES_HMAC_SHA1;
#define NO_PAYLOAD_LENGTH ((size_t)-1)
#if defined(AES_ASM) && ( \
defined(__x86_64) || defined(__x86_64__) || \
defined(_M_AMD64) || defined(_M_X64) || \
@ -123,7 +125,7 @@ static int aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
key->tail = key->head;
key->md = key->head;
key->payload_length = 0;
key->payload_length = NO_PAYLOAD_LENGTH;
return ret<0?0:1;
}
@ -184,7 +186,7 @@ static int aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
if (len%AES_BLOCK_SIZE) return 0;
if (ctx->encrypt) {
if (plen==0)
if (plen==NO_PAYLOAD_LENGTH)
plen = len;
else if (len!=((plen+SHA_DIGEST_LENGTH+AES_BLOCK_SIZE)&-AES_BLOCK_SIZE))
return 0;
@ -270,7 +272,7 @@ static int aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
}
}
key->payload_length = 0;
key->payload_length = NO_PAYLOAD_LENGTH;
return 1;
}

8
ssl/s3_pkt.c
View File

@ -664,10 +664,14 @@ static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
if ( (sess == NULL) ||
(s->enc_write_ctx == NULL) ||
(EVP_MD_CTX_md(s->write_hash) == NULL))
{
#if 1
clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */
#else
clear=1;
if (clear)
#endif
mac_size=0;
}
else
{
mac_size=EVP_MD_CTX_size(s->write_hash);