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e_rc4_hmac_md5.c: harmonize zero-length fragment handling with

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e_aes_cbc_hmac_sha1.c (mostly for aesthetic reasons).
This commit is contained in:
Andy Polyakov 2012-04-18 14:55:39 +00:00
parent e36f6b9cfa
commit 6dd9b0fc43
1 changed files with 7 additions and 5 deletions
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12
crypto/evp/e_rc4_hmac_md5.c
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@ -75,6 +75,8 @@ typedef struct
size_t payload_length; size_t payload_length;
} EVP_RC4_HMAC_MD5; } EVP_RC4_HMAC_MD5;
#define NO_PAYLOAD_LENGTH ((size_t)-1)
void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out, void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,
MD5_CTX *ctx,const void *inp,size_t blocks); MD5_CTX *ctx,const void *inp,size_t blocks);
@ -93,7 +95,7 @@ static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
key->tail = key->head; key->tail = key->head;
key->md = key->head; key->md = key->head;
key->payload_length = 0; key->payload_length = NO_PAYLOAD_LENGTH;
return 1; return 1;
} }
@ -122,10 +124,10 @@ static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
#endif #endif
size_t plen = key->payload_length; size_t plen = key->payload_length;
if (plen && len!=(plen+MD5_DIGEST_LENGTH)) return 0; if (plen!=NO_PAYLOAD_LENGTH && len!=(plen+MD5_DIGEST_LENGTH)) return 0;
if (ctx->encrypt) { if (ctx->encrypt) {
if (plen==0) plen = len; if (plen==NO_PAYLOAD_LENGTH) plen = len;
#if defined(STITCHED_CALL) #if defined(STITCHED_CALL)
/* cipher has to "fall behind" */ /* cipher has to "fall behind" */
if (rc4_off>md5_off) md5_off+=MD5_CBLOCK; if (rc4_off>md5_off) md5_off+=MD5_CBLOCK;
@ -190,7 +192,7 @@ static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
#endif #endif
/* decrypt HMAC at once */ /* decrypt HMAC at once */
RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off); RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
if (plen) { /* "TLS" mode of operation */ if (plen!=NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
MD5_Update(&key->md,out+md5_off,plen-md5_off); MD5_Update(&key->md,out+md5_off,plen-md5_off);
/* calculate HMAC and verify it */ /* calculate HMAC and verify it */
@ -206,7 +208,7 @@ static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
} }
} }
key->payload_length = 0; key->payload_length = NO_PAYLOAD_LENGTH;
return 1; return 1;
} }