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Use libsecp256k1's RFC6979 implementation

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This commit is contained in:
Pieter Wuille
2014-12-18 14:49:19 +01:00
parent ec20fd74b8
commit 1a9576de9d
5 changed files with 21 additions and 144 deletions
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47
src/crypto/rfc6979_hmac_sha256.cpp
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@@ -1,47 +0,0 @@
// Copyright (c) 2014 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "crypto/rfc6979_hmac_sha256.h"
#include <string.h>
#include <algorithm>
static const unsigned char zero[1] = {0x00};
static const unsigned char one[1] = {0x01};
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));
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);
}
RFC6979_HMAC_SHA256::~RFC6979_HMAC_SHA256()
{
memset(V, 0x01, sizeof(V));
memset(K, 0x00, sizeof(K));
}
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);
}
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;
}
retry = true;
}

36
src/crypto/rfc6979_hmac_sha256.h
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@@ -1,36 +0,0 @@
// Copyright (c) 2014 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_RFC6979_HMAC_SHA256_H
#define BITCOIN_RFC6979_HMAC_SHA256_H
#include "crypto/hmac_sha256.h"
#include <stdint.h>
#include <stdlib.h>
/** 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;
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);
/**
* Generate a byte array.
*/
void Generate(unsigned char* output, size_t outputlen);
~RFC6979_HMAC_SHA256();
};
#endif // BITCOIN_RFC6979_HMAC_SHA256_H