Commit 6dd9b0fc authored by Andy Polyakov's avatar Andy Polyakov
Browse files

e_rc4_hmac_md5.c: harmonize zero-length fragment handling with 

e_aes_cbc_hmac_sha1.c (mostly for aesthetic reasons).
parent e36f6b9c

crypto/evp/e_rc4_hmac_md5.c

+7 −5
Original line number Diff line number Diff line
@@ -75,6 +75,8 @@ typedef struct 
    size_t		payload_length;

    } EVP_RC4_HMAC_MD5;



#define NO_PAYLOAD_LENGTH	((size_t)-1)



void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,

		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->md   = key->head;



	key->payload_length = 0;

	key->payload_length = NO_PAYLOAD_LENGTH;



	return 1;

	}
@@ -122,10 +124,10 @@ static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, 
#endif

	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 (plen==0) plen = len;

		if (plen==NO_PAYLOAD_LENGTH) plen = len;

#if defined(STITCHED_CALL)

		/* cipher has to "fall behind" */

		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

		/* decrypt HMAC at once */

		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);



			/* 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;

	}