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357 lines (262 loc) · 6.58 KB
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//
// CryptoStream.cpp
//
// $Id: //poco/1.4/Crypto/src/CryptoStream.cpp#2 $
//
// Library: Crypto
// Package: Cipher
// Module: CryptoStream
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/CryptoStream.h"
#include "Poco/Crypto/CryptoTransform.h"
#include "Poco/Crypto/Cipher.h"
#include "Poco/Exception.h"
#include <algorithm>
#undef min
#undef max
namespace Poco {
namespace Crypto {
//
// CryptoStreamBuf
//
CryptoStreamBuf::CryptoStreamBuf(std::istream& istr, CryptoTransform* pTransform, std::streamsize bufferSize):
Poco::BufferedStreamBuf(bufferSize, std::ios::in),
_pTransform(pTransform),
_pIstr(&istr),
_pOstr(0),
_eof(false),
_buffer(static_cast<std::size_t>(bufferSize))
{
poco_check_ptr (pTransform);
poco_assert (bufferSize > 2 * pTransform->blockSize());
}
CryptoStreamBuf::CryptoStreamBuf(std::ostream& ostr, CryptoTransform* pTransform, std::streamsize bufferSize):
Poco::BufferedStreamBuf(bufferSize, std::ios::out),
_pTransform(pTransform),
_pIstr(0),
_pOstr(&ostr),
_eof(false),
_buffer(static_cast<std::size_t>(bufferSize))
{
poco_check_ptr (pTransform);
poco_assert (bufferSize > 2 * pTransform->blockSize());
}
CryptoStreamBuf::~CryptoStreamBuf()
{
try
{
close();
}
catch (...)
{
}
delete _pTransform;
}
void CryptoStreamBuf::close()
{
sync();
if (_pIstr)
{
_pIstr = 0;
}
else if (_pOstr)
{
// Close can be called multiple times. By zeroing the pointer we make
// sure that we call finalize() only once, even if an exception is
// thrown.
std::ostream* pOstr = _pOstr;
_pOstr = 0;
// Finalize transformation.
std::streamsize n = _pTransform->finalize(_buffer.begin(), static_cast<std::streamsize>(_buffer.size()));
if (n > 0)
{
pOstr->write(reinterpret_cast<char*>(_buffer.begin()), n);
if (!pOstr->good())
throw Poco::IOException("Output stream failure");
}
}
}
int CryptoStreamBuf::readFromDevice(char* buffer, std::streamsize length)
{
if (!_pIstr)
return 0;
int count = 0;
while (!_eof)
{
int m = (static_cast<int>(length) - count)/2 - static_cast<int>(_pTransform->blockSize());
// Make sure we can read at least one more block. Explicitely check
// for m < 0 since blockSize() returns an unsigned int and the
// comparison might give false results for m < 0.
if (m <= 0)
break;
int n = 0;
if (_pIstr->good())
{
_pIstr->read(reinterpret_cast<char*>(_buffer.begin()), m);
n = static_cast<int>(_pIstr->gcount());
}
if (n == 0)
{
_eof = true;
// No more data, finalize transformation
count += static_cast<int>(_pTransform->finalize(
reinterpret_cast<unsigned char*>(buffer + count),
static_cast<int>(length) - count));
}
else
{
// Transform next chunk of data
count += static_cast<int>(_pTransform->transform(
_buffer.begin(),
n,
reinterpret_cast<unsigned char*>(buffer + count),
static_cast<int>(length) - count));
}
}
return count;
}
int CryptoStreamBuf::writeToDevice(const char* buffer, std::streamsize length)
{
if (!_pOstr)
return 0;
std::size_t maxChunkSize = _buffer.size()/2;
std::size_t count = 0;
while (count < length)
{
// Truncate chunk size so that the maximum output fits into _buffer.
std::size_t n = static_cast<std::size_t>(length) - count;
if (n > maxChunkSize)
n = maxChunkSize;
// Transform next chunk of data
std::streamsize k = _pTransform->transform(
reinterpret_cast<const unsigned char*>(buffer + count),
static_cast<std::streamsize>(n),
_buffer.begin(),
static_cast<std::streamsize>(_buffer.size()));
// Attention: (n != k) might be true. In count, we have to track how
// many bytes from buffer have been consumed, not how many bytes have
// been written to _pOstr!
count += n;
if (k > 0)
{
_pOstr->write(reinterpret_cast<const char*>(_buffer.begin()), k);
if (!_pOstr->good())
throw Poco::IOException("Output stream failure");
}
}
return static_cast<int>(count);
}
//
// CryptoIOS
//
CryptoIOS::CryptoIOS(std::istream& istr, CryptoTransform* pTransform, std::streamsize bufferSize):
_buf(istr, pTransform, bufferSize)
{
poco_ios_init(&_buf);
}
CryptoIOS::CryptoIOS(std::ostream& ostr, CryptoTransform* pTransform, std::streamsize bufferSize):
_buf(ostr, pTransform, bufferSize)
{
poco_ios_init(&_buf);
}
CryptoIOS::~CryptoIOS()
{
}
CryptoStreamBuf* CryptoIOS::rdbuf()
{
return &_buf;
}
//
// CryptoInputStream
//
CryptoInputStream::CryptoInputStream(std::istream& istr, CryptoTransform* pTransform, std::streamsize bufferSize):
CryptoIOS(istr, pTransform, bufferSize),
std::istream(&_buf)
{
}
CryptoInputStream::CryptoInputStream(std::istream& istr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(istr, cipher.createEncryptor(), bufferSize),
std::istream(&_buf)
{
}
CryptoInputStream::~CryptoInputStream()
{
}
//
// CryptoOutputStream
//
CryptoOutputStream::CryptoOutputStream(std::ostream& ostr, CryptoTransform* pTransform, std::streamsize bufferSize):
CryptoIOS(ostr, pTransform, bufferSize),
std::ostream(&_buf)
{
}
CryptoOutputStream::CryptoOutputStream(std::ostream& ostr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(ostr, cipher.createDecryptor(), bufferSize),
std::ostream(&_buf)
{
}
CryptoOutputStream::~CryptoOutputStream()
{
}
void CryptoOutputStream::close()
{
_buf.close();
}
//
// EncryptingInputStream
//
EncryptingInputStream::EncryptingInputStream(std::istream& istr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(istr, cipher.createEncryptor(), bufferSize),
std::istream(&_buf)
{
}
EncryptingInputStream::~EncryptingInputStream()
{
}
//
// EncryptingOuputStream
//
EncryptingOutputStream::EncryptingOutputStream(std::ostream& ostr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(ostr, cipher.createEncryptor(), bufferSize),
std::ostream(&_buf)
{
}
EncryptingOutputStream::~EncryptingOutputStream()
{
}
void EncryptingOutputStream::close()
{
_buf.close();
}
//
// DecryptingInputStream
//
DecryptingInputStream::DecryptingInputStream(std::istream& istr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(istr, cipher.createDecryptor(), bufferSize),
std::istream(&_buf)
{
}
DecryptingInputStream::~DecryptingInputStream()
{
}
//
// DecryptingOuputStream
//
DecryptingOutputStream::DecryptingOutputStream(std::ostream& ostr, Cipher& cipher, std::streamsize bufferSize):
CryptoIOS(ostr, cipher.createDecryptor(), bufferSize),
std::ostream(&_buf)
{
}
DecryptingOutputStream::~DecryptingOutputStream()
{
}
void DecryptingOutputStream::close()
{
_buf.close();
}
} } // namespace Poco::Crypto