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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/rfc6979_hmac_sha256.h" | ||
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#include <string.h> | ||
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#include <algorithm> | ||
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static const unsigned char zero[1] = {0x00}; | ||
static const unsigned char one[1] = {0x01}; | ||
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RFC6979_HMAC_SHA256::RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen) : retry(false) | ||
{ | ||
memset(V, 0x01, sizeof(V)); | ||
memset(K, 0x00, sizeof(K)); | ||
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CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Write(key, keylen).Write(msg, msglen).Finalize(K); | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(one, sizeof(one)).Write(key, keylen).Write(msg, msglen).Finalize(K); | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); | ||
} | ||
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RFC6979_HMAC_SHA256::~RFC6979_HMAC_SHA256() | ||
{ | ||
memset(V, 0x01, sizeof(V)); | ||
memset(K, 0x00, sizeof(K)); | ||
} | ||
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void RFC6979_HMAC_SHA256::Generate(unsigned char* output, size_t outputlen) | ||
{ | ||
if (retry) { | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Finalize(K); | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); | ||
} | ||
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while (outputlen > 0) { | ||
CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); | ||
size_t len = std::min(outputlen, sizeof(V)); | ||
memcpy(output, V, len); | ||
output += len; | ||
outputlen -= len; | ||
} | ||
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retry = true; | ||
} |
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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_RFC6979_HMAC_SHA256_H | ||
#define BITCOIN_RFC6979_HMAC_SHA256_H | ||
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#include "crypto/hmac_sha256.h" | ||
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#include <stdint.h> | ||
#include <stdlib.h> | ||
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/** The RFC 6979 PRNG using HMAC-SHA256. */ | ||
class RFC6979_HMAC_SHA256 | ||
{ | ||
private: | ||
unsigned char V[CHMAC_SHA256::OUTPUT_SIZE]; | ||
unsigned char K[CHMAC_SHA256::OUTPUT_SIZE]; | ||
bool retry; | ||
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public: | ||
/** | ||
* Construct a new RFC6979 PRNG, using the given key and message. | ||
* The message is assumed to be already hashed. | ||
*/ | ||
RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen); | ||
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/** | ||
* Generate a byte array. | ||
*/ | ||
void Generate(unsigned char* output, size_t outputlen); | ||
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~RFC6979_HMAC_SHA256(); | ||
}; | ||
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#endif // BITCOIN_RFC6979_HMAC_SHA256_H |
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