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//
// CipherImpl.cpp
//
// Library: Crypto
// Package: Cipher
// Module: CipherImpl
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/CipherImpl.h"
#include "Poco/Crypto/CryptoTransform.h"
#include "Poco/Exception.h"
#include "Poco/Buffer.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::string getTag(std::size_t tagSize);
void setTag(const std::string& tag);
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;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
EVP_CIPHER_CTX* _pContext;
#else
EVP_CIPHER_CTX _context;
#endif
ByteVec _key;
ByteVec _iv;
};
CryptoTransformImpl::CryptoTransformImpl(
const EVP_CIPHER* pCipher,
const ByteVec& key,
const ByteVec& iv,
Direction dir):
_pCipher(pCipher),
_key(key),
_iv(iv)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
_pContext = EVP_CIPHER_CTX_new();
EVP_CipherInit(
_pContext,
_pCipher,
&_key[0],
_iv.empty() ? 0 : &_iv[0],
(dir == DIR_ENCRYPT) ? 1 : 0);
#else
EVP_CipherInit(
&_context,
_pCipher,
&_key[0],
_iv.empty() ? 0 : &_iv[0],
(dir == DIR_ENCRYPT) ? 1 : 0);
#endif
#if OPENSSL_VERSION_NUMBER >= 0x10001000L
if (_iv.size() != EVP_CIPHER_iv_length(_pCipher) && EVP_CIPHER_mode(_pCipher) == EVP_CIPH_GCM_MODE)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
int rc = EVP_CIPHER_CTX_ctrl(_pContext, EVP_CTRL_GCM_SET_IVLEN, _iv.size(), NULL);
#else
int rc = EVP_CIPHER_CTX_ctrl(&_context, EVP_CTRL_GCM_SET_IVLEN, _iv.size(), NULL);
#endif
if (rc == 0) throwError();
}
#endif
}
CryptoTransformImpl::~CryptoTransformImpl()
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
EVP_CIPHER_CTX_cleanup(_pContext);
EVP_CIPHER_CTX_free(_pContext);
#else
EVP_CIPHER_CTX_cleanup(&_context);
#endif
}
std::size_t CryptoTransformImpl::blockSize() const
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
return EVP_CIPHER_CTX_block_size(_pContext);
#else
return EVP_CIPHER_CTX_block_size(&_context);
#endif
}
int CryptoTransformImpl::setPadding(int padding)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
return EVP_CIPHER_CTX_block_size(_pContext);
#else
return EVP_CIPHER_CTX_set_padding(&_context, padding);
#endif
}
std::string CryptoTransformImpl::getTag(std::size_t tagSize)
{
std::string tag;
#if OPENSSL_VERSION_NUMBER >= 0x10001000L
Poco::Buffer<char> buffer(tagSize);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
int rc = EVP_CIPHER_CTX_ctrl(_pContext, EVP_CTRL_GCM_GET_TAG, tagSize, buffer.begin());
#else
int rc = EVP_CIPHER_CTX_ctrl(&_context, EVP_CTRL_GCM_GET_TAG, tagSize, buffer.begin());
#endif
if (rc == 0) throwError();
tag.assign(buffer.begin(), tagSize);
#endif
return tag;
}
void CryptoTransformImpl::setTag(const std::string& tag)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
int rc = EVP_CIPHER_CTX_ctrl(_pContext, EVP_CTRL_GCM_SET_TAG, tag.size(), const_cast<char*>(tag.data()));
#elif OPENSSL_VERSION_NUMBER >= 0x10001000L
int rc = EVP_CIPHER_CTX_ctrl(&_context, EVP_CTRL_GCM_SET_TAG, tag.size(), const_cast<char*>(tag.data()));
#else
int rc = 0;
#endif
if (rc == 0) throwError();
}
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);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
int rc = EVP_CipherUpdate(
_pContext,
output,
&outLen,
input,
static_cast<int>(inputLength));
#else
int rc = EVP_CipherUpdate(
&_context,
output,
&outLen,
input,
static_cast<int>(inputLength));
#endif
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.
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
int rc = EVP_CipherFinal_ex(_pContext, output, &len);
#else
int rc = EVP_CipherFinal_ex(&_context, output, &len);
#endif
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
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