hmacsha256.c

00001 // Copyright (c) Microsoft. All rights reserved.
00002 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
00003 
00004 #include <stddef.h>
00005 #include "azure_c_shared_utility/hmacsha256.h"
00006 #include "azure_c_shared_utility/hmac.h"
00007 #include "azure_c_shared_utility/buffer_.h"
00008 
00009 HMACSHA256_RESULT HMACSHA256_ComputeHash(const unsigned char* key, size_t keyLen, const unsigned char* payload, size_t payloadLen, BUFFER_HANDLE hash)
00010 {
00011     HMACSHA256_RESULT result;
00012 
00013     if (key == NULL ||
00014         keyLen == 0 ||
00015         payload == NULL ||
00016         payloadLen == 0 ||
00017         hash == NULL)
00018     {
00019         result = HMACSHA256_INVALID_ARG;
00020     }
00021     else
00022     {
00023         if ((BUFFER_enlarge(hash, 32) != 0) ||
00024             (hmac(SHA256, payload, (int)payloadLen, key, (int)keyLen, BUFFER_u_char(hash) ) != 0))
00025         {
00026             result = HMACSHA256_ERROR;
00027         }
00028         else
00029         {
00030             result = HMACSHA256_OK;
00031         }
00032     }
00033 
00034     return result;
00035 }