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/*
* Copyright (C) 2000 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS 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 2 of the License, or
* (at your option) any later version.
*
* GNUTLS 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <defines.h>
#include <gnutls_int.h>
#include <gnutls_hash_int.h>
/* This file handles all the internal functions that cope with hashes
* and hmacs. Currently it uses the functions provided by
* the gcrypt library that this can be easily changed.
*/
GNUTLS_HASH_HANDLE gnutls_hash_init(MACAlgorithm algorithm) {
GNUTLS_HASH_HANDLE ret;
switch (algorithm) {
case GNUTLS_MAC_NULL:
ret = GNUTLS_HASH_FAILED;
break;
case GNUTLS_MAC_SHA:
#ifdef USE_MHASH
ret = mhash_init( MHASH_SHA1);
#else
ret = gcry_md_open( GCRY_MD_SHA1, 0);
#endif
if (!ret) return GNUTLS_HASH_FAILED;
break;
case GNUTLS_MAC_MD5:
#ifdef USE_MHASH
ret = mhash_init( MHASH_MD5);
#else
ret = gcry_md_open( GCRY_MD_MD5, 0);
#endif
if (!ret) return GNUTLS_HASH_FAILED;
break;
default:
ret = GNUTLS_HASH_FAILED;
}
return ret;
}
int gnutls_hash_get_algo_len(MACAlgorithm algorithm) {
int ret;
switch (algorithm) {
case GNUTLS_MAC_NULL:
ret = 0;
break;
case GNUTLS_MAC_SHA:
#ifdef USE_MHASH
ret = mhash_get_block_size(MHASH_SHA1);
#else
ret = gcry_md_get_algo_dlen( GCRY_MD_SHA1);
#endif
break;
case GNUTLS_MAC_MD5:
#ifdef USE_MHASH
ret = mhash_get_block_size(MHASH_MD5);
#else
ret = gcry_md_get_algo_dlen( GCRY_MD_MD5);
#endif
break;
default:
ret = 0;
}
return ret;
}
int gnutls_hash(GNUTLS_HASH_HANDLE handle, void* text, int textlen) {
#ifdef USE_MHASH
mhash( handle, text, textlen);
#else
gcry_md_write( handle, text, textlen);
#endif
return 0;
}
void* gnutls_hash_deinit( GNUTLS_HASH_HANDLE handle) {
char* mac;
int maclen;
char* ret;
#ifdef USE_MHASH
ret = mhash_end(handle);
#else
maclen = gcry_md_get_algo_dlen(gcry_md_get_algo(handle));
ret = gnutls_malloc(maclen);
gcry_md_final(handle);
mac = gcry_md_read(handle,0);
memmove( ret, mac, maclen);
gcry_md_close(handle);
#endif
return ret;
}
GNUTLS_MAC_HANDLE _gnutls_hmac_init( MACAlgorithm algorithm, char* key, int keylen, int dp) {
GNUTLS_MAC_HANDLE ret;
switch (algorithm) {
case GNUTLS_MAC_NULL:
ret = GNUTLS_MAC_FAILED;
break;
case GNUTLS_MAC_SHA:
#ifdef USE_MHASH
if (dp==0) {
ret = mhash_hmac_init( MHASH_SHA1, key, keylen, 0);
} else {
ret = mhash_hmac_init_dp( MHASH_SHA1, key, keylen, 0);
}
#else
ret = gcry_md_open( GCRY_MD_SHA1, GCRY_MD_FLAG_HMAC);
#endif
if (!ret) ret = GNUTLS_MAC_FAILED;
break;
case GNUTLS_MAC_MD5:
#ifdef USE_MHASH
if (dp==0) {
ret = mhash_hmac_init( MHASH_MD5, key, keylen, 0);
} else {
ret = mhash_hmac_init_dp( MHASH_MD5, key, keylen, 0);
}
#else
ret = gcry_md_open( GCRY_MD_MD5, GCRY_MD_FLAG_HMAC);
#endif
if (!ret) ret = GNUTLS_MAC_FAILED;
break;
default:
ret = GNUTLS_MAC_FAILED;
}
#ifndef USE_MHASH
if (ret!=GNUTLS_MAC_FAILED) gcry_md_setkey(ret, key, keylen);
#endif
return ret;
}
int gnutls_hmac_get_algo_len(MACAlgorithm algorithm) {
int ret;
switch (algorithm) {
case GNUTLS_MAC_NULL:
ret = 0;
break;
case GNUTLS_MAC_SHA:
#ifdef USE_MHASH
ret = mhash_get_block_size(MHASH_SHA1);
#else
ret = gcry_md_get_algo_dlen( GCRY_MD_SHA1);
#endif
break;
case GNUTLS_MAC_MD5:
#ifdef USE_MHASH
ret = mhash_get_block_size(MHASH_MD5);
#else
ret = gcry_md_get_algo_dlen( GCRY_MD_MD5);
#endif
break;
default:
ret = 0;
}
return ret;
}
int gnutls_hmac(GNUTLS_MAC_HANDLE handle, void* text, int textlen) {
#ifdef USE_MHASH
mhash( handle, text, textlen);
#else
gcry_md_write( handle, text, textlen);
#endif
return 0;
}
void* _gnutls_hmac_deinit( GNUTLS_MAC_HANDLE handle, int dp) {
char* mac;
int maclen;
char* ret;
#ifdef USE_MHASH
if (dp==0) {
ret = mhash_hmac_end(handle);
} else {
ret = mhash_hmac_end_dp(handle);
}
#else
maclen = gcry_md_get_algo_dlen(gcry_md_get_algo(handle));
ret = gnutls_malloc( maclen);
gcry_md_final(handle);
mac = gcry_md_read(handle,0);
memmove( ret, mac, maclen);
gcry_md_close(handle);
#endif
return ret;
}
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