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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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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;