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// Copyright (c) 2014 The Bitcoin developers | ||
// Distributed under the MIT software license, see the accompanying | ||
// 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) | ||
{ | ||
unsigned char rkey[64]; | ||
if (keylen <= 64) { | ||
memcpy(rkey, key, keylen); | ||
memset(rkey + keylen, 0, 64 - keylen); | ||
} else { | ||
CSHA256().Write(key, keylen).Finalize(rkey); | ||
memset(rkey + 32, 0, 32); | ||
} | ||
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for (int n = 0; n < 64; n++) | ||
rkey[n] ^= 0x5c; | ||
outer.Write(rkey, 64); | ||
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for (int n = 0; n < 64; n++) | ||
rkey[n] ^= 0x5c ^ 0x36; | ||
inner.Write(rkey, 64); | ||
} | ||
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void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE]) | ||
{ | ||
unsigned char temp[32]; | ||
inner.Finalize(temp); | ||
outer.Write(temp, 32).Finalize(hash); | ||
} |
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// Copyright (c) 2014 The Bitcoin developers | ||
// Distributed under the MIT software license, see the accompanying | ||
// file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
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#ifndef BITCOIN_HMAC_SHA256_H | ||
#define BITCOIN_HMAC_SHA256_H | ||
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#include "crypto/sha256.h" | ||
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#include <stdint.h> | ||
#include <stdlib.h> | ||
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/** A hasher class for HMAC-SHA-512. */ | ||
class CHMAC_SHA256 | ||
{ | ||
private: | ||
CSHA256 outer; | ||
CSHA256 inner; | ||
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public: | ||
static const size_t OUTPUT_SIZE = 32; | ||
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CHMAC_SHA256(const unsigned char* key, size_t keylen); | ||
CHMAC_SHA256& Write(const unsigned char* data, size_t len) | ||
{ | ||
inner.Write(data, len); | ||
return *this; | ||
} | ||
void Finalize(unsigned char hash[OUTPUT_SIZE]); | ||
}; | ||
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#endif // BITCOIN_SHA256_H |
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