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//
// CipherImpl.cpp
//
// $Id: //poco/1.4/Crypto/src/CipherImpl.cpp#3 $
//
// Library: Crypto
// Package: Cipher
// Module: CipherImpl
//
// 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/CipherImpl.h"
#include "Poco/Crypto/CryptoTransform.h"
#include "Poco/Exception.h"
#include <openssl/err.h>
namespace Poco {
namespace Crypto {
namespace
{
void throwError()
{
unsigned long err;
std::string msg;
while ((err = ERR_get_error()))
{
if (!msg.empty())
msg.append("; ");
msg.append(ERR_error_string(err, 0));
}
throw Poco::IOException(msg);
}
class CryptoTransformImpl: public CryptoTransform
{
public:
typedef Cipher::ByteVec ByteVec;
enum Direction
{
DIR_ENCRYPT,
DIR_DECRYPT
};
CryptoTransformImpl(
const EVP_CIPHER* pCipher,
const ByteVec& key,
const ByteVec& iv,
Direction dir);
~CryptoTransformImpl();
std::size_t blockSize() const;
int setPadding(int padding);
std::streamsize transform(
const unsigned char* input,
std::streamsize inputLength,
unsigned char* output,
std::streamsize outputLength);
std::streamsize finalize(
unsigned char* output,
std::streamsize length);
private:
const EVP_CIPHER* _pCipher;
EVP_CIPHER_CTX _ctx;
ByteVec _key;
ByteVec _iv;
};
CryptoTransformImpl::CryptoTransformImpl(
const EVP_CIPHER* pCipher,
const ByteVec& key,
const ByteVec& iv,
Direction dir):
_pCipher(pCipher),
_key(key),
_iv(iv)
{
EVP_CipherInit(
&_ctx,
_pCipher,
&_key[0],
_iv.empty() ? 0 : &_iv[0],
(dir == DIR_ENCRYPT) ? 1 : 0);
}
CryptoTransformImpl::~CryptoTransformImpl()
{
EVP_CIPHER_CTX_cleanup(&_ctx);
}
std::size_t CryptoTransformImpl::blockSize() const
{
return EVP_CIPHER_CTX_block_size(&_ctx);
}
int CryptoTransformImpl::setPadding(int padding)
{
return EVP_CIPHER_CTX_set_padding(&_ctx, padding);
}
std::streamsize CryptoTransformImpl::transform(
const unsigned char* input,
std::streamsize inputLength,
unsigned char* output,
std::streamsize outputLength)
{
poco_assert (outputLength >= (inputLength + blockSize() - 1));
int outLen = static_cast<int>(outputLength);
int rc = EVP_CipherUpdate(
&_ctx,
output,
&outLen,
input,
static_cast<int>(inputLength));
if (rc == 0)
throwError();
return static_cast<std::streamsize>(outLen);
}
std::streamsize CryptoTransformImpl::finalize(
unsigned char* output,
std::streamsize length)
{
poco_assert (length >= blockSize());
int len = static_cast<int>(length);
// Use the '_ex' version that does not perform implicit cleanup since we
// will call EVP_CIPHER_CTX_cleanup() from the dtor as there is no
// guarantee that finalize() will be called if an error occurred.
int rc = EVP_CipherFinal_ex(&_ctx, output, &len);
if (rc == 0)
throwError();
return static_cast<std::streamsize>(len);
}
}
CipherImpl::CipherImpl(const CipherKey& key):
_key(key)
{
}
CipherImpl::~CipherImpl()
{
}
CryptoTransform* CipherImpl::createEncryptor()
{
CipherKeyImpl::Ptr p = _key.impl();
return new CryptoTransformImpl(p->cipher(), p->getKey(), p->getIV(), CryptoTransformImpl::DIR_ENCRYPT);
}
CryptoTransform* CipherImpl::createDecryptor()
{
CipherKeyImpl::Ptr p = _key.impl();
return new CryptoTransformImpl(p->cipher(), p->getKey(), p->getIV(), CryptoTransformImpl::DIR_DECRYPT);
}
} } // namespace Poco::Crypto