160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* hmac.c
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*
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* Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
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*
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* This file is part of CyaSSL.
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*
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* CyaSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* CyaSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef NO_HMAC
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#include "ctc_hmac.h"
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#include "ctc_error.h"
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static int InitHmac(Hmac* hmac, int type)
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{
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hmac->innerHashKeyed = 0;
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hmac->macType = type;
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if (!(type == MD5 || type == SHA || type == SHA256))
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return BAD_FUNC_ARG;
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if (type == MD5)
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InitMd5(&hmac->hash.md5);
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else if (type == SHA)
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InitSha(&hmac->hash.sha);
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#ifndef NO_SHA256
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else if (type == SHA256)
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InitSha256(&hmac->hash.sha256);
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#endif
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return 0;
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}
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void HmacSetKey(Hmac* hmac, int type, const byte* key, word32 length)
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{
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byte* ip = (byte*) hmac->ipad;
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byte* op = (byte*) hmac->opad;
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word32 i;
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InitHmac(hmac, type);
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if (length <= HMAC_BLOCK_SIZE)
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XMEMCPY(ip, key, length);
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else {
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if (hmac->macType == MD5) {
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Md5Update(&hmac->hash.md5, key, length);
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Md5Final(&hmac->hash.md5, ip);
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length = MD5_DIGEST_SIZE;
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}
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else if (hmac->macType == SHA) {
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ShaUpdate(&hmac->hash.sha, key, length);
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ShaFinal(&hmac->hash.sha, ip);
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length = SHA_DIGEST_SIZE;
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}
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#ifndef NO_SHA256
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else if (hmac->macType == SHA256) {
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Sha256Update(&hmac->hash.sha256, key, length);
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Sha256Final(&hmac->hash.sha256, ip);
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length = SHA256_DIGEST_SIZE;
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}
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#endif
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}
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XMEMSET(ip + length, 0, HMAC_BLOCK_SIZE - length);
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for(i = 0; i < HMAC_BLOCK_SIZE; i++) {
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op[i] = ip[i] ^ OPAD;
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ip[i] ^= IPAD;
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}
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}
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static void HmacKeyInnerHash(Hmac* hmac)
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{
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if (hmac->macType == MD5)
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Md5Update(&hmac->hash.md5, (byte*) hmac->ipad, HMAC_BLOCK_SIZE);
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else if (hmac->macType == SHA)
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ShaUpdate(&hmac->hash.sha, (byte*) hmac->ipad, HMAC_BLOCK_SIZE);
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#ifndef NO_SHA256
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else if (hmac->macType == SHA256)
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Sha256Update(&hmac->hash.sha256, (byte*) hmac->ipad, HMAC_BLOCK_SIZE);
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#endif
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hmac->innerHashKeyed = 1;
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}
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void HmacUpdate(Hmac* hmac, const byte* msg, word32 length)
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{
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if (!hmac->innerHashKeyed)
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HmacKeyInnerHash(hmac);
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if (hmac->macType == MD5)
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Md5Update(&hmac->hash.md5, msg, length);
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else if (hmac->macType == SHA)
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ShaUpdate(&hmac->hash.sha, msg, length);
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#ifndef NO_SHA256
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else if (hmac->macType == SHA256)
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Sha256Update(&hmac->hash.sha256, msg, length);
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#endif
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}
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void HmacFinal(Hmac* hmac, byte* hash)
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{
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if (!hmac->innerHashKeyed)
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HmacKeyInnerHash(hmac);
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if (hmac->macType == MD5) {
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Md5Final(&hmac->hash.md5, (byte*) hmac->innerHash);
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Md5Update(&hmac->hash.md5, (byte*) hmac->opad, HMAC_BLOCK_SIZE);
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Md5Update(&hmac->hash.md5, (byte*) hmac->innerHash, MD5_DIGEST_SIZE);
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Md5Final(&hmac->hash.md5, hash);
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}
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else if (hmac->macType ==SHA) {
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ShaFinal(&hmac->hash.sha, (byte*) hmac->innerHash);
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ShaUpdate(&hmac->hash.sha, (byte*) hmac->opad, HMAC_BLOCK_SIZE);
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ShaUpdate(&hmac->hash.sha, (byte*) hmac->innerHash, SHA_DIGEST_SIZE);
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ShaFinal(&hmac->hash.sha, hash);
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}
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#ifndef NO_SHA256
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else if (hmac->macType ==SHA256) {
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Sha256Final(&hmac->hash.sha256, (byte*) hmac->innerHash);
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Sha256Update(&hmac->hash.sha256, (byte*) hmac->opad, HMAC_BLOCK_SIZE);
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Sha256Update(&hmac->hash.sha256, (byte*) hmac->innerHash,
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SHA256_DIGEST_SIZE);
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Sha256Final(&hmac->hash.sha256, hash);
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}
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#endif
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hmac->innerHashKeyed = 0;
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}
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#endif /* NO_HMAC */
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