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ECDSADigestEngine.cpp
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//
// ECDSADigestEngine.cpp
//
//
// Library: Crypto
// Package: ECDSA
// Module: ECDSADigestEngine
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/ECDSADigestEngine.h"
#include "Poco/Crypto/CryptoException.h"
#include <openssl/ecdsa.h>
namespace Poco {
namespace Crypto {
//
// ECDSADigestEngine
//
ECDSADigestEngine::ECDSADigestEngine(const ECKey& key, const std::string &name):
_key(key),
_engine(name)
{
}
ECDSADigestEngine::~ECDSADigestEngine()
{
}
std::size_t ECDSADigestEngine::digestLength() const
{
return _engine.digestLength();
}
void ECDSADigestEngine::reset()
{
_engine.reset();
_digest.clear();
_signature.clear();
}
const DigestEngine::Digest& ECDSADigestEngine::digest()
{
if (_digest.empty())
{
_digest = _engine.digest();
}
return _digest;
}
const DigestEngine::Digest& ECDSADigestEngine::signature()
{
if (_signature.empty())
{
digest();
_signature.resize(_key.size());
unsigned sigLen = static_cast<unsigned>(_signature.size());
if (!ECDSA_sign(0, &_digest[0], static_cast<unsigned>(_digest.size()),
&_signature[0], &sigLen, _key.impl()->getECKey()))
{
throw OpenSSLException();
}
if (sigLen < _signature.size()) _signature.resize(sigLen);
}
return _signature;
}
bool ECDSADigestEngine::verify(const DigestEngine::Digest& sig)
{
digest();
EC_KEY* pKey = _key.impl()->getECKey();
if (pKey)
{
int ret = ECDSA_verify(0, &_digest[0], static_cast<unsigned>(_digest.size()),
&sig[0], static_cast<unsigned>(sig.size()),
pKey);
if (1 == ret) return true;
else if (0 == ret) return false;
}
throw OpenSSLException();
}
void ECDSADigestEngine::updateImpl(const void* data, std::size_t length)
{
_engine.update(data, length);
}
//
// ECDSASignature
//
ECDSASignature::ECDSASignature(const ByteVec& derSignature)
{
poco_assert (!derSignature.empty());
const unsigned char* p = &derSignature[0];
_pSig = d2i_ECDSA_SIG(0, &p, static_cast<long>(derSignature.size()));
if (!_pSig)
throw OpenSSLException();
}
ECDSASignature::ECDSASignature(const ByteVec& rawR, const ByteVec& rawS):
_pSig(ECDSA_SIG_new())
{
poco_assert (!rawR.empty() && !rawS.empty());
if (!_pSig) throw CryptoException("cannot allocate ECDSA signature");
try
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
ECDSA_SIG_set0(_pSig,
BN_bin2bn(&rawR[0], static_cast<long>(rawR.size()), 0),
BN_bin2bn(&rawS[0], static_cast<long>(rawS.size()), 0));
const BIGNUM* pR = 0;
const BIGNUM* pS = 0;
ECDSA_SIG_get0(_pSig, &pR, &pS);
if (pR == 0 || pS == 0)
throw Poco::Crypto::CryptoException("failed to decode R and S values");
#else
if (!BN_bin2bn(&rawR[0], rawR.size(), _pSig->r))
throw Poco::Crypto::OpenSSLException();
if (!BN_bin2bn(&rawS[0], rawS.size(), _pSig->s))
throw Poco::Crypto::OpenSSLException();
#endif
}
catch (...)
{
ECDSA_SIG_free(_pSig);
throw;
}
}
ECDSASignature::~ECDSASignature()
{
ECDSA_SIG_free(_pSig);
}
ECDSASignature::ByteVec ECDSASignature::toDER() const
{
int size = i2d_ECDSA_SIG(_pSig, 0);
if (size > 0)
{
ByteVec buffer(size);
unsigned char* p = &buffer[0];
i2d_ECDSA_SIG(_pSig, &p);
return buffer;
}
else throw OpenSSLException();
}
ECDSASignature::ByteVec ECDSASignature::rawR() const
{
ByteVec buffer;
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
const BIGNUM* pR = ECDSA_SIG_get0_r(_pSig);
#elif OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM* pR = 0;
ECDSA_SIG_get0(_pSig, &pR, 0);
#else
const BIGNUM* pR = _pSig->r;
#endif
if (pR)
{
buffer.resize(BN_num_bytes(pR));
BN_bn2bin(pR, &buffer[0]);
}
return buffer;
}
ECDSASignature::ByteVec ECDSASignature::rawS() const
{
ByteVec buffer;
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
const BIGNUM* pS = ECDSA_SIG_get0_s(_pSig);
#elif OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM* pS = 0;
ECDSA_SIG_get0(_pSig, 0, &pS);
#else
const BIGNUM* pS = _pSig->s;
#endif
if (pS)
{
buffer.resize(BN_num_bytes(pS));
BN_bn2bin(pS, &buffer[0]);
}
return buffer;
}
} } // namespace Poco::Crypto