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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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2
src/Makefile.am
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@ -209,14 +209,12 @@ crypto_libbitcoin_crypto_a_SOURCES = \
crypto/sha256.cpp \
crypto/sha512.cpp \
crypto/hmac_sha256.cpp \
crypto/rfc6979_hmac_sha256.cpp \
crypto/hmac_sha512.cpp \
crypto/ripemd160.cpp \
crypto/common.h \
crypto/sha256.h \
crypto/sha512.h \
crypto/hmac_sha256.h \
crypto/rfc6979_hmac_sha256.h \
crypto/hmac_sha512.h \
crypto/sha1.h \
crypto/ripemd160.h

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

45
src/key.cpp
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@ -6,7 +6,6 @@
#include "arith_uint256.h"
#include "crypto/hmac_sha512.h"
#include "crypto/rfc6979_hmac_sha256.h"
#include "eccryptoverify.h"
#include "pubkey.h"
#include "random.h"
@ -74,23 +73,28 @@ CPubKey CKey::GetPubKey() const {
return result;
}
extern "C"
{
static int secp256k1_nonce_function_test_case(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, unsigned int attempt, const void *data)
{
const uint32_t *test_case = static_cast<const uint32_t*>(data);
uint256 nonce;
secp256k1_nonce_function_rfc6979(nonce.begin(), msg32, key32, attempt, NULL);
nonce = ArithToUint256(UintToArith256(nonce) + *test_case);
memcpy(nonce32, nonce.begin(), 32);
return 1;
}
}
bool CKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, uint32_t test_case) const {
if (!fValid)
return false;
vchSig.resize(72);
RFC6979_HMAC_SHA256 prng(begin(), 32, (unsigned char*)&hash, 32);
do {
uint256 nonce;
prng.Generate((unsigned char*)&nonce, 32);
nonce = ArithToUint256(UintToArith256(nonce) + test_case);
int nSigLen = 72;
int ret = secp256k1_ecdsa_sign((const unsigned char*)&hash, (unsigned char*)&vchSig[0], &nSigLen, begin(), (unsigned char*)&nonce);
nonce = uint256();
if (ret) {
vchSig.resize(nSigLen);
return true;
}
} while(true);
int nSigLen = 72;
int ret = secp256k1_ecdsa_sign(hash.begin(), (unsigned char*)&vchSig[0], &nSigLen, begin(), test_case == 0 ? secp256k1_nonce_function_rfc6979 : secp256k1_nonce_function_test_case, test_case == 0 ? NULL : &test_case);
assert(ret);
vchSig.resize(nSigLen);
return true;
}
bool CKey::VerifyPubKey(const CPubKey& pubkey) const {
@ -101,7 +105,7 @@ bool CKey::VerifyPubKey(const CPubKey& pubkey) const {
std::string str = "Bitcoin key verification\n";
GetRandBytes(rnd, sizeof(rnd));
uint256 hash;
CHash256().Write((unsigned char*)str.data(), str.size()).Write(rnd, sizeof(rnd)).Finalize((unsigned char*)&hash);
CHash256().Write((unsigned char*)str.data(), str.size()).Write(rnd, sizeof(rnd)).Finalize(hash.begin());
std::vector<unsigned char> vchSig;
Sign(hash, vchSig);
return pubkey.Verify(hash, vchSig);
@ -112,15 +116,8 @@ bool CKey::SignCompact(const uint256 &hash, std::vector<unsigned char>& vchSig)
return false;
vchSig.resize(65);
int rec = -1;
RFC6979_HMAC_SHA256 prng(begin(), 32, (unsigned char*)&hash, 32);
do {
uint256 nonce;
prng.Generate((unsigned char*)&nonce, 32);
int ret = secp256k1_ecdsa_sign_compact((const unsigned char*)&hash, &vchSig[1], begin(), (unsigned char*)&nonce, &rec);
nonce = uint256();
if (ret)
break;
} while(true);
int ret = secp256k1_ecdsa_sign_compact(hash.begin(), &vchSig[1], begin(), secp256k1_nonce_function_rfc6979, NULL, &rec);
assert(ret);
assert(rec != -1);
vchSig[0] = 27 + rec + (fCompressed ? 4 : 0);
return true;

35
src/test/crypto_tests.cpp
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@ -2,7 +2,6 @@
// 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 "crypto/ripemd160.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
@ -248,38 +247,4 @@ BOOST_AUTO_TEST_CASE(hmac_sha512_testvectors) {
"b6022cac3c4982b10d5eeb55c3e4de15134676fb6de0446065c97440fa8c6a58");
}
void TestRFC6979(const std::string& hexkey, const std::string& hexmsg, const std::vector<std::string>& hexout)
{
std::vector<unsigned char> key = ParseHex(hexkey);
std::vector<unsigned char> msg = ParseHex(hexmsg);
RFC6979_HMAC_SHA256 rng(&key[0], key.size(), &msg[0], msg.size());
for (unsigned int i = 0; i < hexout.size(); i++) {
std::vector<unsigned char> out = ParseHex(hexout[i]);
std::vector<unsigned char> gen;
gen.resize(out.size());
rng.Generate(&gen[0], gen.size());
BOOST_CHECK(out == gen);
}
}
BOOST_AUTO_TEST_CASE(rfc6979_hmac_sha256)
{
TestRFC6979(
"0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f00",
"4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a",
boost::assign::list_of
("4fe29525b2086809159acdf0506efb86b0ec932c7ba44256ab321e421e67e9fb")
("2bf0fff1d3c378a22dc5de1d856522325c65b504491a0cbd01cb8f3aa67ffd4a")
("f528b410cb541f77000d7afb6c5b53c5c471eab43e466d9ac5190c39c82fd82e"));
TestRFC6979(
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
boost::assign::list_of
("9c236c165b82ae0cd590659e100b6bab3036e7ba8b06749baf6981e16f1a2b95")
("df471061625bc0ea14b682feee2c9c02f235da04204c1d62a1536c6e17aed7a9")
("7597887cbd76321f32e30440679a22cf7f8d9d2eac390e581fea091ce202ba94"));
}
BOOST_AUTO_TEST_SUITE_END()