TomZ
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (C) 2014 The Bitcoin Core developers
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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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#include "hmac_sha256.h"
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#include <cstring>
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CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)
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{
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unsigned char rkey[64];
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if (keylen <= 64) {
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memcpy(rkey, key, keylen);
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memset(rkey + keylen, 0, 64 - keylen);
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} else {
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CSHA256().Write(key, keylen).Finalize(rkey);
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memset(rkey + 32, 0, 32);
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}
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for (int n = 0; n < 64; n++)
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rkey[n] ^= 0x5c;
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outer.Write(rkey, 64);
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for (int n = 0; n < 64; n++)
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rkey[n] ^= 0x5c ^ 0x36;
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inner.Write(rkey, 64);
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}
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void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
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{
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unsigned char temp[32];
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inner.Finalize(temp);
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outer.Write(temp, 32).Finalize(hash);
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}
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