35 lines
897 B
C++
35 lines
897 B
C++
// Copyright (c) 2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "crypto/hmac_sha256.h"
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#include <string.h>
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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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