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/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/
/**@file tsk_hmac.c
* @brief HMAC: Keyed-Hashing for Message Authentication (RFC 2104) / FIPS-198-1.
*
* @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
*/
#include "tsk_hmac.h"
#include "tsk_string.h"
#include "tsk_buffer.h"
#include <string.h>
/**@defgroup tsk_hmac_group Keyed-Hashing for Message Authentication (RFC 2104/ FIPS-198-1).
*/
/**@ingroup tsk_hmac_group
*/
typedef enum tsk_hash_type_e { md5, sha1 } tsk_hash_type_t;
int tsk_hmac_xxxcompute(const uint8_t* input, tsk_size_t input_size, const char* key, tsk_size_t key_size, tsk_hash_type_t type, uint8_t* digest)
{
#define TSK_MAX_BLOCK_SIZE TSK_SHA1_BLOCK_SIZE
tsk_size_t i, newkey_size;
tsk_size_t block_size = type == md5 ? TSK_MD5_BLOCK_SIZE : TSK_SHA1_BLOCK_SIZE; // Only SHA-1 and MD5 are supported for now
tsk_size_t digest_size = type == md5 ? TSK_MD5_DIGEST_SIZE : TSK_SHA1_DIGEST_SIZE;
char hkey [TSK_MAX_BLOCK_SIZE];
uint8_t ipad [TSK_MAX_BLOCK_SIZE];
uint8_t opad [TSK_MAX_BLOCK_SIZE];
memset(ipad, 0, sizeof(ipad));
memset(opad, 0, sizeof(ipad));
/*
* H(K XOR opad, H(K XOR ipad, input))
*/
// Check key len
if (key_size > block_size) {
if(type == md5) {
TSK_MD5_DIGEST_CALC(key, key_size, (uint8_t*)hkey);
}
else if(type == sha1) {
TSK_SHA1_DIGEST_CALC((uint8_t*)key, (unsigned int)key_size, (uint8_t*)hkey);
}
else {
return -3;
}
newkey_size = digest_size;
}
else {
memcpy(hkey, key, key_size);
newkey_size = key_size;
}
memcpy(ipad, hkey, newkey_size);
memcpy(opad, hkey, newkey_size);
/* [K XOR ipad] and [K XOR opad]*/
for (i=0; i<block_size; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
{
tsk_buffer_t *passx; // pass1 or pass2
int pass1_done = 0;
passx = tsk_buffer_create(ipad, block_size); // pass1
tsk_buffer_append(passx, input, input_size);
digest_compute:
if(type == md5) {
TSK_MD5_DIGEST_CALC(TSK_BUFFER_TO_U8(passx), (unsigned int)TSK_BUFFER_SIZE(passx), digest);
}
else {
TSK_SHA1_DIGEST_CALC(TSK_BUFFER_TO_U8(passx), (unsigned int)TSK_BUFFER_SIZE(passx), digest);
}
if(pass1_done) {
TSK_OBJECT_SAFE_FREE(passx);
goto pass1_and_pass2_done;
}
else {
pass1_done = 1;
}
tsk_buffer_cleanup(passx);
tsk_buffer_append(passx, opad, block_size); // pass2
tsk_buffer_append(passx, digest, digest_size);
goto digest_compute;
}
pass1_and_pass2_done:
return 0;
}
/**@ingroup tsk_hmac_group
*
* Calculate HMAC-MD5 hash (hexa-string) as per RFC 2104.
*
* @author Mamadou
* @date 12/29/2009
*
* @param [in,out] input The input data.
* @param input_size The size of the input.
* @param [in,out] key The input key.
* @param key_size The size of the input key.
* @param [out] result Pointer to the result.
*
* @return Zero if succeed and non-zero error code otherwise.
**/
int hmac_md5_compute(const uint8_t* input, tsk_size_t input_size, const char* key, tsk_size_t key_size, tsk_md5string_t *result)
{
tsk_md5digest_t digest;
int ret;
if((ret = hmac_md5digest_compute(input, input_size, key, key_size, digest))) {
return ret;
}
tsk_str_from_hex(digest, TSK_MD5_DIGEST_SIZE, *result);
(*result)[TSK_MD5_STRING_SIZE] = '\0';
return 0;
}
/**@ingroup tsk_hmac_group
*
* Calculate HMAC-MD5 hash (bytes) as per RFC 2104.
*
* @author Mamadou
* @date 12/29/2009
*
* @param [in,out] input The input data.
* @param input_size The Size of the input.
* @param [in,out] key The input key.
* @param key_size The size of the input key.
* @param result Pointer to the result.
*
* @return Zero if succeed and non-zero error code otherwise.
**/
int hmac_md5digest_compute(const uint8_t* input, tsk_size_t input_size, const char* key, tsk_size_t key_size, tsk_md5digest_t result)
{
return tsk_hmac_xxxcompute(input, input_size, key, key_size, md5, result);
}
/**@ingroup tsk_hmac_group
*
* Calculate HMAC-SHA-1 hash (hexa-string) as per RFC 2104.
*
* @author Mamadou
* @date 12/29/2009
*
* @param [in,out] input The input data.
* @param input_size The Size of the input.
* @param [in,out] key The input key.
* @param key_size The size of the input key.
* @param [out] result Pointer to the result.
*
* @return Zero if succeed and non-zero error code otherwise.
**/
int hmac_sha1_compute(const uint8_t* input, tsk_size_t input_size, const char* key, tsk_size_t key_size, tsk_sha1string_t *result)
{
tsk_sha1digest_t digest;
int ret;
if((ret = hmac_sha1digest_compute(input, input_size, key, key_size, digest))) {
return ret;
}
tsk_str_from_hex((uint8_t*)digest, TSK_SHA1_DIGEST_SIZE, (char*)*result);
(*result)[TSK_SHA1_STRING_SIZE] = '\0';
return 0;
}
/**@ingroup tsk_hmac_group
*
* Calculate HMAC-SHA-1 hash (bytes) as per RFC 2104.
*
* @author Mamadou
* @date 12/29/2009
*
* @param [in,out] input If non-null, the input.
* @param input_size The size of the input.
* @param [in,out] key The input key.
* @param key_size The size of the input key.
* @param result Pointer to the result.
*
* @return Zero if succeed and non-zero error code otherwise.
**/
int hmac_sha1digest_compute(const uint8_t* input, tsk_size_t input_size, const char* key, tsk_size_t key_size, tsk_sha1digest_t result)
{
return tsk_hmac_xxxcompute(input, input_size, key, key_size, sha1, (uint8_t*)result);
}
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