Nigel Rantor / azure_c_shared_utility

Azure IoT common library

Fork of azure_c_shared_utility by Azure IoT

hmacsha256.c@0:fa2de1b79154, 2016-04-08 (annotated)

Committer:
Azure.IoT Build
Date:
Fri Apr 08 12:01:36 2016 -0700
Revision:
0:fa2de1b79154
Child:
19:2e0811512ceb
1.0.4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Azure.IoT Build 0:fa2de1b79154 1 // Copyright (c) Microsoft. All rights reserved.
Azure.IoT Build 0:fa2de1b79154 2 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
Azure.IoT Build 0:fa2de1b79154 3
Azure.IoT Build 0:fa2de1b79154 4 #include <stdlib.h>
Azure.IoT Build 0:fa2de1b79154 5 #ifdef _CRTDBG_MAP_ALLOC
Azure.IoT Build 0:fa2de1b79154 6 #include <crtdbg.h>
Azure.IoT Build 0:fa2de1b79154 7 #endif
Azure.IoT Build 0:fa2de1b79154 8 #include "azure_c_shared_utility/gballoc.h"
Azure.IoT Build 0:fa2de1b79154 9
Azure.IoT Build 0:fa2de1b79154 10 #include "azure_c_shared_utility/hmacsha256.h"
Azure.IoT Build 0:fa2de1b79154 11 #include "azure_c_shared_utility/hmac.h"
Azure.IoT Build 0:fa2de1b79154 12 #include "azure_c_shared_utility/strings.h"
Azure.IoT Build 0:fa2de1b79154 13
Azure.IoT Build 0:fa2de1b79154 14 HMACSHA256_RESULT HMACSHA256_ComputeHash(const unsigned char* key, size_t keyLen, const unsigned char* payload, size_t payloadLen, BUFFER_HANDLE hash)
Azure.IoT Build 0:fa2de1b79154 15 {
Azure.IoT Build 0:fa2de1b79154 16 HMACSHA256_RESULT result;
Azure.IoT Build 0:fa2de1b79154 17
Azure.IoT Build 0:fa2de1b79154 18 if (key == NULL ||
Azure.IoT Build 0:fa2de1b79154 19 keyLen == 0 ||
Azure.IoT Build 0:fa2de1b79154 20 payload == NULL ||
Azure.IoT Build 0:fa2de1b79154 21 payloadLen == 0 ||
Azure.IoT Build 0:fa2de1b79154 22 hash == NULL)
Azure.IoT Build 0:fa2de1b79154 23 {
Azure.IoT Build 0:fa2de1b79154 24 result = HMACSHA256_INVALID_ARG;
Azure.IoT Build 0:fa2de1b79154 25 }
Azure.IoT Build 0:fa2de1b79154 26 else
Azure.IoT Build 0:fa2de1b79154 27 {
Azure.IoT Build 0:fa2de1b79154 28 if ((BUFFER_enlarge(hash, 32) != 0) ||
Azure.IoT Build 0:fa2de1b79154 29 (hmac(SHA256, payload, (int)payloadLen, key, (int)keyLen, BUFFER_u_char(hash) ) != 0))
Azure.IoT Build 0:fa2de1b79154 30 {
Azure.IoT Build 0:fa2de1b79154 31 result = HMACSHA256_ERROR;
Azure.IoT Build 0:fa2de1b79154 32 }
Azure.IoT Build 0:fa2de1b79154 33 else
Azure.IoT Build 0:fa2de1b79154 34 {
Azure.IoT Build 0:fa2de1b79154 35 result = HMACSHA256_OK;
Azure.IoT Build 0:fa2de1b79154 36 }
Azure.IoT Build 0:fa2de1b79154 37 }
Azure.IoT Build 0:fa2de1b79154 38
Azure.IoT Build 0:fa2de1b79154 39 return result;
Azure.IoT Build 0:fa2de1b79154 40 }