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RSADigestEngine.cpp

//
// RSADigestEngine.cpp
//
// $Id: //poco/1.4/Crypto/src/RSADigestEngine.cpp#1 $
//
// Library: Crypto
// Package: RSA
// Module:  RSADigestEngine
//
// 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/RSADigestEngine.h"
#include <openssl/pem.h>


namespace Poco {
namespace Crypto {


RSADigestEngine::RSADigestEngine(const RSAKey& key, DigestType digestType):
      _key(key),
      _engine(digestType == DIGEST_MD5 ? static_cast<Poco::DigestEngine&>(_md5Engine) : static_cast<Poco::DigestEngine&>(_sha1Engine)),
      _type(digestType == DIGEST_MD5 ? NID_md5 : NID_sha1)
{
}


00053 RSADigestEngine::~RSADigestEngine()
{
}


00058 unsigned RSADigestEngine::digestLength() const
{
      return _engine.digestLength();
}


00064 void RSADigestEngine::reset()
{
      _engine.reset();
      _digest.clear();
      _signature.clear();
}

      
00072 const DigestEngine::Digest& RSADigestEngine::digest()
{
      if (_digest.empty())
      {
            _digest = _engine.digest();
      }
      return _digest;
}


00082 const DigestEngine::Digest& RSADigestEngine::signature()
{
      if (_signature.empty())
      {
            digest();
            _signature.resize(_key.size());
            unsigned sigLen = static_cast<unsigned>(_signature.size());
            RSA_sign(_type, &_digest[0], static_cast<unsigned>(_digest.size()), &_signature[0], &sigLen, _key.impl()->getRSA());
            // truncate _sig to sigLen
            if (sigLen < _signature.size())
                  _signature.resize(sigLen);
      }
    return _signature;
}

      
00098 bool RSADigestEngine::verify(const DigestEngine::Digest& sig)
{
      digest();
      DigestEngine::Digest sigCpy = sig; // copy becausse RSA_verify can modify sigCpy
      int ret = RSA_verify(_type, &_digest[0], static_cast<unsigned>(_digest.size()), &sigCpy[0], static_cast<unsigned>(sigCpy.size()), _key.impl()->getRSA());
      return ret != 0;
}


00107 void RSADigestEngine::updateImpl(const void* data, unsigned length)
{
      _engine.update(data, length);
}


} } // namespace Poco::Crypto

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