mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-27 08:22:31 +00:00
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
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/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include "HMAC.hpp"
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#include <openssl/sha.h>
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namespace ZeroTier {
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void HMAC::sha256(const void *key,unsigned int klen,const void *message,unsigned int len,void *mac)
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throw()
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{
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union {
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uint64_t q[12];
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uint8_t b[96];
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} key2,opad,ipad;
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SHA256_CTX sha;
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if (klen == 32) { // this is what we use, so handle this quickly
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key2.q[0] = ((const uint64_t *)key)[0];
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key2.q[1] = ((const uint64_t *)key)[1];
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key2.q[2] = ((const uint64_t *)key)[2];
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key2.q[3] = ((const uint64_t *)key)[3];
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key2.q[4] = 0ULL;
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key2.q[5] = 0ULL;
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key2.q[6] = 0ULL;
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key2.q[7] = 0ULL;
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} else { // for correctness and testing against test vectors
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if (klen > 64) {
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SHA256_Init(&sha);
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SHA256_Update(&sha,key,klen);
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SHA256_Final(key2.b,&sha);
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klen = 32;
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} else {
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for(unsigned int i=0;i<klen;++i)
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key2.b[i] = ((const uint8_t *)key)[i];
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}
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while (klen < 64)
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key2.b[klen++] = (uint8_t)0;
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}
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for(unsigned int i=0;i<8;++i)
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opad.q[i] = 0x5c5c5c5c5c5c5c5cULL ^ key2.q[i];
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for(unsigned int i=0;i<8;++i)
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ipad.q[i] = 0x3636363636363636ULL ^ key2.q[i];
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SHA256_Init(&sha);
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SHA256_Update(&sha,(const unsigned char *)ipad.b,64);
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SHA256_Update(&sha,(const unsigned char *)message,len);
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SHA256_Final((unsigned char *)(opad.b + 64),&sha);
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SHA256_Init(&sha);
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SHA256_Update(&sha,opad.b,96);
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SHA256_Final((unsigned char *)mac,&sha);
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}
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} // namespace ZeroTier
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