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//
// CipherKeyImpl.cpp
//
// $Id: //poco/1.4/Crypto/src/CipherKeyImpl.cpp#1 $
//
// Library: Crypto
// Package: Cipher
// Module: CipherKeyImpl
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Crypto/CipherKeyImpl.h"
#include "Poco/Crypto/CryptoTransform.h"
#include "Poco/Crypto/CipherFactory.h"
#include "Poco/Exception.h"
#include "Poco/RandomStream.h"
#include <openssl/err.h>
#include <openssl/evp.h>
namespace Poco {
namespace Crypto {
CipherKeyImpl::CipherKeyImpl(const std::string& name,
const std::string& passphrase,
const std::string& salt,
int iterationCount):
_pCipher(0),
_name(name),
_key(),
_iv()
{
// dummy access to Cipherfactory so that the EVP lib is initilaized
CipherFactory::defaultFactory();
_pCipher = EVP_get_cipherbyname(name.c_str());
if (!_pCipher)
throw Poco::NotFoundException("Cipher " + name + " was not found");
_key = ByteVec(keySize());
_iv = ByteVec(ivSize());
generateKey(passphrase, salt, iterationCount);
}
CipherKeyImpl::CipherKeyImpl(const std::string& name,
const ByteVec& key,
const ByteVec& iv):
_pCipher(0),
_name(name),
_key(key),
_iv(iv)
{
// dummy access to Cipherfactory so that the EVP lib is initilaized
CipherFactory::defaultFactory();
_pCipher = EVP_get_cipherbyname(name.c_str());
if (!_pCipher)
throw Poco::NotFoundException("Cipher " + name + " was not found");
}
CipherKeyImpl::CipherKeyImpl(const std::string& name):
_pCipher(0),
_name(name),
_key(),
_iv()
{
// dummy access to Cipherfactory so that the EVP lib is initilaized
CipherFactory::defaultFactory();
_pCipher = EVP_get_cipherbyname(name.c_str());
if (!_pCipher)
throw Poco::NotFoundException("Cipher " + name + " was not found");
_key = ByteVec(keySize());
_iv = ByteVec(ivSize());
generateKey();
}
CipherKeyImpl::~CipherKeyImpl()
{
}
CipherKeyImpl::Mode CipherKeyImpl::mode() const
{
switch (EVP_CIPHER_mode(_pCipher))
{
case EVP_CIPH_STREAM_CIPHER:
return MODE_STREAM_CIPHER;
case EVP_CIPH_ECB_MODE:
return MODE_ECB;
case EVP_CIPH_CBC_MODE:
return MODE_CBC;
case EVP_CIPH_CFB_MODE:
return MODE_CFB;
case EVP_CIPH_OFB_MODE:
return MODE_OFB;
}
throw Poco::IllegalStateException("Unexpected value of EVP_CIPHER_mode()");
}
void CipherKeyImpl::generateKey()
{
ByteVec vec;
getRandomBytes(vec, keySize());
setKey(vec);
getRandomBytes(vec, ivSize());
setIV(vec);
}
void CipherKeyImpl::getRandomBytes(ByteVec& vec, std::size_t count)
{
Poco::RandomInputStream random;
vec.clear();
vec.reserve(count);
for (int i = 0; i < count; ++i)
vec.push_back(static_cast<unsigned char>(random.get()));
}
void CipherKeyImpl::generateKey(
const std::string& password,
const std::string& salt,
int iterationCount)
{
unsigned char keyBytes[EVP_MAX_KEY_LENGTH];
unsigned char ivBytes[EVP_MAX_IV_LENGTH];
// OpenSSL documentation specifies that the salt must be an 8-byte array.
unsigned char saltBytes[8];
if (!salt.empty())
{
int len = static_cast<int>(salt.size());
// Create the salt array from the salt string
for (int i = 0; i < 8; ++i)
saltBytes[i] = salt.at(i % len);
for (int i = 8; i < len; ++i)
saltBytes[i % 8] ^= salt.at(i);
}
// Now create the key and IV, using the MD5 digest algorithm.
int keySize = EVP_BytesToKey(
_pCipher,
EVP_md5(),
(salt.empty() ? 0 : saltBytes),
reinterpret_cast<const unsigned char*>(password.data()),
static_cast<int>(password.size()),
iterationCount,
keyBytes,
ivBytes);
// Copy the buffers to our member byte vectors.
_key.assign(keyBytes, keyBytes + keySize);
if (ivSize() == 0)
_iv.clear();
else
_iv.assign(ivBytes, ivBytes + ivSize());
}
int CipherKeyImpl::keySize() const
{
return EVP_CIPHER_key_length(_pCipher);
}
int CipherKeyImpl::blockSize() const
{
return EVP_CIPHER_block_size(_pCipher);
}
int CipherKeyImpl::ivSize() const
{
return EVP_CIPHER_iv_length(_pCipher);
}
} } // namespace Poco::Crypto