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//
// RSAKeyImpl.cpp
//
// Library: Crypto
// Package: RSA
// Module: RSAKeyImpl
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/RSAKeyImpl.h"
#include "Poco/Crypto/X509Certificate.h"
#include "Poco/Crypto/PKCS12Container.h"
#include "Poco/FileStream.h"
#include "Poco/StreamCopier.h"
#include <sstream>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
#include <openssl/bn.h>
#endif
namespace Poco {
namespace Crypto {
RSAKeyImpl::RSAKeyImpl(const EVPPKey& key):
KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(EVP_PKEY_get1_RSA(const_cast<EVP_PKEY*>((const EVP_PKEY*)key)))
{
if (!_pRSA) throw OpenSSLException();
}
RSAKeyImpl::RSAKeyImpl(const X509Certificate& cert):
KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(0)
{
const X509* pCert = cert.certificate();
EVP_PKEY* pKey = X509_get_pubkey(const_cast<X509*>(pCert));
if (pKey)
{
_pRSA = EVP_PKEY_get1_RSA(pKey);
EVP_PKEY_free(pKey);
}
else
throw OpenSSLException("RSAKeyImpl(const X509Certificate&)");
}
RSAKeyImpl::RSAKeyImpl(const PKCS12Container& cont):
KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(0)
{
EVPPKey key = cont.getKey();
_pRSA = EVP_PKEY_get1_RSA(key);
}
RSAKeyImpl::RSAKeyImpl(int keyLength, unsigned long exponent): KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(0)
{
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
_pRSA = RSA_new();
int ret = 0;
BIGNUM* bn = 0;
try
{
bn = BN_new();
BN_set_word(bn, exponent);
ret = RSA_generate_key_ex(_pRSA, keyLength, bn, 0);
BN_free(bn);
}
catch (...)
{
BN_free(bn);
throw;
}
if (!ret) throw Poco::InvalidArgumentException("Failed to create RSA context");
#else
_pRSA = RSA_generate_key(keyLength, exponent, 0, 0);
if (!_pRSA) throw Poco::InvalidArgumentException("Failed to create RSA context");
#endif
}
RSAKeyImpl::RSAKeyImpl(const std::string& publicKeyFile,
const std::string& privateKeyFile,
const std::string& privateKeyPassphrase): KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(0)
{
poco_assert_dbg(_pRSA == 0);
_pRSA = RSA_new();
if (!publicKeyFile.empty())
{
BIO* bio = BIO_new(BIO_s_file());
if (!bio) throw Poco::IOException("Cannot create BIO for reading public key", publicKeyFile);
int rc = BIO_read_filename(bio, publicKeyFile.c_str());
if (rc)
{
RSA* pubKey = PEM_read_bio_RSAPublicKey(bio, &_pRSA, 0, 0);
if (!pubKey)
{
int rc = BIO_reset(bio);
// BIO_reset() normally returns 1 for success and 0 or -1 for failure.
// File BIOs are an exception, they return 0 for success and -1 for failure.
if (rc != 0) throw Poco::FileException("Failed to load public key", publicKeyFile);
pubKey = PEM_read_bio_RSA_PUBKEY(bio, &_pRSA, 0, 0);
}
BIO_free(bio);
if (!pubKey)
{
freeRSA();
throw Poco::FileException("Failed to load public key", publicKeyFile);
}
}
else
{
freeRSA();
throw Poco::FileNotFoundException("Public key file", publicKeyFile);
}
}
if (!privateKeyFile.empty())
{
BIO* bio = BIO_new(BIO_s_file());
if (!bio) throw Poco::IOException("Cannot create BIO for reading private key", privateKeyFile);
int rc = BIO_read_filename(bio, privateKeyFile.c_str());
if (rc)
{
RSA* privKey = 0;
if (privateKeyPassphrase.empty())
privKey = PEM_read_bio_RSAPrivateKey(bio, &_pRSA, 0, 0);
else
privKey = PEM_read_bio_RSAPrivateKey(bio, &_pRSA, 0, const_cast<char*>(privateKeyPassphrase.c_str()));
BIO_free(bio);
if (!privKey)
{
freeRSA();
throw Poco::FileException("Failed to load private key", privateKeyFile);
}
}
else
{
freeRSA();
throw Poco::FileNotFoundException("Private key file", privateKeyFile);
}
}
}
RSAKeyImpl::RSAKeyImpl(std::istream* pPublicKeyStream,
std::istream* pPrivateKeyStream,
const std::string& privateKeyPassphrase): KeyPairImpl("rsa", KT_RSA_IMPL),
_pRSA(0)
{
poco_assert_dbg(_pRSA == 0);
_pRSA = RSA_new();
if (pPublicKeyStream)
{
std::string publicKeyData;
Poco::StreamCopier::copyToString(*pPublicKeyStream, publicKeyData);
BIO* bio = BIO_new_mem_buf(const_cast<char*>(publicKeyData.data()), static_cast<int>(publicKeyData.size()));
if (!bio) throw Poco::IOException("Cannot create BIO for reading public key");
RSA* publicKey = PEM_read_bio_RSAPublicKey(bio, &_pRSA, 0, 0);
if (!publicKey)
{
int rc = BIO_reset(bio);
// BIO_reset() normally returns 1 for success and 0 or -1 for failure.
// File BIOs are an exception, they return 0 for success and -1 for failure.
if (rc != 1) throw Poco::FileException("Failed to load public key");
publicKey = PEM_read_bio_RSA_PUBKEY(bio, &_pRSA, 0, 0);
}
BIO_free(bio);
if (!publicKey)
{
freeRSA();
throw Poco::FileException("Failed to load public key");
}
}
if (pPrivateKeyStream)
{
std::string privateKeyData;
Poco::StreamCopier::copyToString(*pPrivateKeyStream, privateKeyData);
BIO* bio = BIO_new_mem_buf(const_cast<char*>(privateKeyData.data()), static_cast<int>(privateKeyData.size()));
if (!bio) throw Poco::IOException("Cannot create BIO for reading private key");
RSA* privateKey = 0;
if (privateKeyPassphrase.empty())
privateKey = PEM_read_bio_RSAPrivateKey(bio, &_pRSA, 0, 0);
else
privateKey = PEM_read_bio_RSAPrivateKey(bio, &_pRSA, 0, const_cast<char*>(privateKeyPassphrase.c_str()));
BIO_free(bio);
if (!privateKey)
{
freeRSA();
throw Poco::FileException("Failed to load private key");
}
}
}
RSAKeyImpl::~RSAKeyImpl()
{
freeRSA();
}
void RSAKeyImpl::freeRSA()
{
if (_pRSA) RSA_free(_pRSA);
_pRSA = 0;
}
int RSAKeyImpl::size() const
{
return RSA_size(_pRSA);
}
RSAKeyImpl::ByteVec RSAKeyImpl::modulus() const
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM* n = 0;
const BIGNUM* e = 0;
const BIGNUM* d = 0;
RSA_get0_key(_pRSA, &n, &e, &d);
return convertToByteVec(n);
#else
return convertToByteVec(_pRSA->n);
#endif
}
RSAKeyImpl::ByteVec RSAKeyImpl::encryptionExponent() const
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM* n = 0;
const BIGNUM* e = 0;
const BIGNUM* d = 0;
RSA_get0_key(_pRSA, &n, &e, &d);
return convertToByteVec(e);
#else
return convertToByteVec(_pRSA->e);
#endif
}
RSAKeyImpl::ByteVec RSAKeyImpl::decryptionExponent() const
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
const BIGNUM* n = 0;
const BIGNUM* e = 0;
const BIGNUM* d = 0;
RSA_get0_key(_pRSA, &n, &e, &d);
return convertToByteVec(d);
#else
return convertToByteVec(_pRSA->d);
#endif
}
void RSAKeyImpl::save(const std::string& publicKeyFile,
const std::string& privateKeyFile,
const std::string& privateKeyPassphrase) const
{
if (!publicKeyFile.empty())
{
BIO* bio = BIO_new(BIO_s_file());
if (!bio) throw Poco::IOException("Cannot create BIO for writing public key file", publicKeyFile);
try
{
if (BIO_write_filename(bio, const_cast<char*>(publicKeyFile.c_str())))
{
if (!PEM_write_bio_RSAPublicKey(bio, _pRSA))
throw Poco::WriteFileException("Failed to write public key to file", publicKeyFile);
}
else throw Poco::CreateFileException("Cannot create public key file");
}
catch (...)
{
BIO_free(bio);
throw;
}
BIO_free(bio);
}
if (!privateKeyFile.empty())
{
BIO* bio = BIO_new(BIO_s_file());
if (!bio) throw Poco::IOException("Cannot create BIO for writing private key file", privateKeyFile);
try
{
if (BIO_write_filename(bio, const_cast<char*>(privateKeyFile.c_str())))
{
int rc = 0;
if (privateKeyPassphrase.empty())
rc = PEM_write_bio_RSAPrivateKey(bio, _pRSA, 0, 0, 0, 0, 0);
else
rc = PEM_write_bio_RSAPrivateKey(bio, _pRSA, EVP_des_ede3_cbc(),
reinterpret_cast<unsigned char*>(const_cast<char*>(privateKeyPassphrase.c_str())),
static_cast<int>(privateKeyPassphrase.length()), 0, 0);
if (!rc) throw Poco::FileException("Failed to write private key to file", privateKeyFile);
}
else throw Poco::CreateFileException("Cannot create private key file", privateKeyFile);
}
catch (...)
{
BIO_free(bio);
throw;
}
BIO_free(bio);
}
}
void RSAKeyImpl::save(std::ostream* pPublicKeyStream,
std::ostream* pPrivateKeyStream,
const std::string& privateKeyPassphrase) const
{
if (pPublicKeyStream)
{
BIO* bio = BIO_new(BIO_s_mem());
if (!bio) throw Poco::IOException("Cannot create BIO for writing public key");
if (!PEM_write_bio_RSAPublicKey(bio, _pRSA))
{
BIO_free(bio);
throw Poco::WriteFileException("Failed to write public key to stream");
}
char* pData;
long size = BIO_get_mem_data(bio, &pData);
pPublicKeyStream->write(pData, static_cast<std::streamsize>(size));
BIO_free(bio);
}
if (pPrivateKeyStream)
{
BIO* bio = BIO_new(BIO_s_mem());
if (!bio) throw Poco::IOException("Cannot create BIO for writing public key");
int rc = 0;
if (privateKeyPassphrase.empty())
rc = PEM_write_bio_RSAPrivateKey(bio, _pRSA, 0, 0, 0, 0, 0);
else
rc = PEM_write_bio_RSAPrivateKey(bio, _pRSA, EVP_des_ede3_cbc(),
reinterpret_cast<unsigned char*>(const_cast<char*>(privateKeyPassphrase.c_str())),
static_cast<int>(privateKeyPassphrase.length()), 0, 0);
if (!rc)
{
BIO_free(bio);
throw Poco::FileException("Failed to write private key to stream");
}
char* pData;
long size = BIO_get_mem_data(bio, &pData);
pPrivateKeyStream->write(pData, static_cast<std::streamsize>(size));
BIO_free(bio);
}
}
RSAKeyImpl::ByteVec RSAKeyImpl::convertToByteVec(const BIGNUM* bn)
{
int numBytes = BN_num_bytes(bn);
ByteVec byteVector(numBytes);
ByteVec::value_type* buffer = new ByteVec::value_type[numBytes];
BN_bn2bin(bn, buffer);
for (int i = 0; i < numBytes; ++i)
byteVector[i] = buffer[i];
delete [] buffer;
return byteVector;
}
} } // namespace Poco::Crypto
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