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RSAKeyImpl.cpp
//
// RSAKeyImpl.cpp
//
// $Id: //poco/1.3/Crypto/src/RSAKeyImpl.cpp#7 $
//
// Library: Crypto
// Package: RSA
// Module:  RSAKeyImpl
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Crypto/RSAKeyImpl.h"
#include "Poco/Crypto/X509Certificate.h"
#include "Poco/FileStream.h"
#include "Poco/StreamCopier.h"
#include "Poco/TemporaryFile.h"
#include <openssl/pem.h>
#include <openssl/rsa.h>
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
#include <openssl/bn.h>
#endif


namespace Poco {
namespace Crypto {


RSAKeyImpl::RSAKeyImpl(const X509Certificate& cert):
      _pRSA(0)
{
      const X509* pCert = cert.certificate();
      EVP_PKEY* pKey = X509_get_pubkey(const_cast<X509*>(pCert));
      
      RSA* pRSA = pKey->pkey.rsa;
      _pRSA = RSAPublicKey_dup(pRSA);
}


00064 RSAKeyImpl::RSAKeyImpl(int keyLength, unsigned long exponent):
      _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
}


00091 RSAKeyImpl::RSAKeyImpl(
            const std::string& publicKeyFile, 
            const std::string& privateKeyFile, 
            const std::string& privateKeyPassphrase):
      _pRSA(0)
{
      init(publicKeyFile, privateKeyFile, privateKeyPassphrase);
}


00101 RSAKeyImpl::RSAKeyImpl(std::istream* pPublicKeyStream, std::istream* pPrivateKeyStream, const std::string& privateKeyPassphrase):
      _pRSA(0)
{
      // due to C lib not supporting streams, we create two temporary files
      std::string publicKeyFile;
      Poco::TemporaryFile pubFile;
      if (pPublicKeyStream)
      {
            if (!pubFile.createFile())
                  throw Poco::CreateFileException("Cannot create temporary file for writing public key");
            publicKeyFile = pubFile.path();
            Poco::FileOutputStream fout(publicKeyFile);
            Poco::StreamCopier::copyStream(*pPublicKeyStream, fout);
      }
      std::string privateKeyFile;
      Poco::TemporaryFile privFile;
      if (pPrivateKeyStream)
      {
            if (!privFile.createFile())
                  throw Poco::CreateFileException("Cannot create temporary file for writing private key");
            privateKeyFile = privFile.path();
            Poco::FileOutputStream fout(privateKeyFile);
            Poco::StreamCopier::copyStream(*pPrivateKeyStream, fout);

      }
      init(publicKeyFile, privateKeyFile, privateKeyPassphrase);
}


00130 void RSAKeyImpl::init(const std::string& publicKeyFile, const std::string& privateKeyFile, const std::string& privateKeyPassphrase)
{
      poco_assert_dbg(_pRSA == 0);
      
      _pRSA = RSA_new();
      if (!publicKeyFile.empty())
      {
            BIO* out = BIO_new(BIO_s_file());
            if (!out) throw Poco::IOException("Cannot create BIO for reading public key", publicKeyFile);
            int rc = BIO_read_filename(out, publicKeyFile.c_str());
            if (rc)
            {
                  RSA* pubKey = PEM_read_bio_RSAPublicKey(out, &_pRSA, 0, 0);
                  BIO_free(out);
                  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* out = BIO_new(BIO_s_file());
            if (!out) throw Poco::IOException("Cannot create BIO for reading private key", privateKeyFile);
            int rc = BIO_read_filename(out, privateKeyFile.c_str());
            if (rc)
            {
                  RSA* privKey = 0;
                  if (privateKeyPassphrase.empty())
                        privKey = PEM_read_bio_RSAPrivateKey(out, &_pRSA, 0, 0);
                  else
                        privKey = PEM_read_bio_RSAPrivateKey(out, &_pRSA, 0, const_cast<char*>(privateKeyPassphrase.c_str()));
                  BIO_free(out);
                  if (!privKey)
                  {
                        freeRSA();
                        throw Poco::FileException("Failed to load private key", privateKeyFile);
                  }
            }
            else
            {
                  freeRSA();
                  throw Poco::FileNotFoundException("Private key file", privateKeyFile);
            }
      }
}


00185 RSAKeyImpl::~RSAKeyImpl()
{
      freeRSA();
}


void RSAKeyImpl::freeRSA()
{
      if (_pRSA)
            RSA_free(_pRSA);
      _pRSA = 0;
}


00199 int RSAKeyImpl::size() const
{
      return RSA_size(_pRSA);
}


00205 void RSAKeyImpl::save(const std::string& publicKeyFile, const std::string& privateKeyFile, const std::string& privateKeyPassphrase)
{
      if (!publicKeyFile.empty())
      {
            BIO* out = BIO_new(BIO_s_file());
            if (!out) throw Poco::IOException("Cannot create BIO for writing public key file", publicKeyFile);
            try
            {
                  if (BIO_write_filename(out, const_cast<char*>(publicKeyFile.c_str())))
                  {
                        if (!PEM_write_bio_RSAPublicKey(out, _pRSA))
                              throw Poco::WriteFileException("Failed to write public key to file", publicKeyFile);
                  }
                  else throw Poco::CreateFileException("Cannot create public key file");
            }
            catch (...)
            {
                  BIO_free(out);
                  throw;
            }
            BIO_free(out);
      }
      
      if (!privateKeyFile.empty())
      {
            BIO* out = BIO_new(BIO_s_file());
            if (!out) throw Poco::IOException("Cannot create BIO for writing private key file", privateKeyFile);
            try
            {
                  if (BIO_write_filename(out, const_cast<char*>(privateKeyFile.c_str())))
                  {
                        int rc = 0;
                        if (privateKeyPassphrase.empty())
                              rc = PEM_write_bio_RSAPrivateKey(out, _pRSA, EVP_des_ede3_cbc(), 0, 0, 0, 0);
                        else
                              rc = PEM_write_bio_RSAPrivateKey(out, _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(out);
                  throw;
            }
            BIO_free(out);
      }
}


00257 void RSAKeyImpl::save(std::ostream* pPublicKeyStream, std::ostream* pPrivateKeyStream, const std::string& privateKeyPassphrase)
{
      if (!pPublicKeyStream && !pPrivateKeyStream) return;
      
      // due to C lib not supporting streams, we create two temporary files
      std::string publicKeyFile;
      Poco::TemporaryFile pubFile;
      if (pPublicKeyStream)
      {
            publicKeyFile = pubFile.path();
            if (!pubFile.createFile())
                  throw Poco::CreateFileException("Cannot create temporary public file");
      }
      std::string privateKeyFile;
      Poco::TemporaryFile privFile;
      if (pPrivateKeyStream)
      {
            privateKeyFile = privFile.path();
            if (!privFile.createFile())
                  throw Poco::FileException("Cannot crate temporary private key file");
      }
      save(publicKeyFile, privateKeyFile, privateKeyPassphrase);
      
      // now copy everything from the temp files to the original streams
      if (pPublicKeyStream)
      {
            Poco::FileInputStream istr(publicKeyFile);
            Poco::StreamCopier::copyStream(istr, *pPublicKeyStream);
      }
      if (pPrivateKeyStream)
      {
            Poco::FileInputStream istr(privateKeyFile);
            Poco::StreamCopier::copyStream(istr, *pPrivateKeyStream);
      }
}


} } // namespace Poco::Crypto

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