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#include "cryptengine.h"
CryptEngine::CryptEngine(QObject *parent)
: QObject(parent)
{
m_algorithm = 0; //Initialize NullCipher
m_cryptClass = new CryptClassNullCipher;
}
CryptEngine::~CryptEngine()
{
delete m_cryptClass;
}
void CryptEngine::generateRandomKey()
{
m_cryptClass->generateRandomKey();
}
QByteArray CryptEngine::createPasswordHash(const QString &password)
{
QByteArray ret(256, 0);
EVP_MD_CTX *ctx;
/* Create and initialise the context */
if (!(ctx = EVP_MD_CTX_create()))
{
handleOpenSslError();
}
/* Initialise the encryption operation. IMPORTANT - ensure you use a key
* and IV size appropriate for your cipher */
if (1 != EVP_DigestInit_ex(ctx, EVP_sha256(), NULL))
{
handleOpenSslError();
}
/* Provide the message to be encrypted, and obtain the encrypted output.
* EVP_EncryptUpdate can be called multiple times if necessary
*/
if (1 != EVP_DigestUpdate(ctx, password.data(), password.size()))
{
handleOpenSslError();
}
/* Finalise the encryption. Further ciphertext bytes may be written at
* this stage.
*/
if (1 != EVP_DigestFinal_ex(ctx, (unsigned char *) ret.data(), NULL))
{
handleOpenSslError();
}
EVP_MD_CTX_destroy(ctx);
return ret;
}
QByteArray CryptEngine::createRandomIv(int length)
{
QByteArray ret(length, 0);
qint64 m_time = QDateTime::currentMSecsSinceEpoch();
RAND_seed(&m_time, sizeof m_time);
if(1 != RAND_bytes((unsigned char *) ret.data(), ret.length()))
{
handleOpenSslError();
}
return ret;
}
void CryptEngine::handleOpenSslError()
{
throw std::runtime_error(ERR_reason_error_string(ERR_get_error()));
}
void CryptEngine::setKey(QString value)
{
m_cryptClass->setKey( value.toLatin1() );
}
void CryptEngine::setKey(QByteArray value)
{
m_cryptClass->setKey( value );
}
void CryptEngine::setKey(const uchar *value, int keyLength )
{
m_cryptClass->setKey( value, keyLength );
}
QByteArray &CryptEngine::getKey()
{
return m_cryptClass->getKey();
}
void CryptEngine::setCryptText(QByteArray value)
{
m_cryptClass->setCryptText(value);
}
void CryptEngine::setCryptText(const uchar *value, int dataLength )
{
m_cryptClass->setCryptText(value, dataLength);
}
void CryptEngine::setClearText(QByteArray value)
{
m_cryptClass->setClearText(value);
}
void CryptEngine::setClearText(const uchar *value, int dataLength )
{
m_cryptClass->setClearText(value, dataLength);
}
void CryptEngine::encrypt()
{
//If cleartext present, set in CryptClass, encrypt, and fetch encrypted data
if( m_cryptClass->getClearText().length() > 0 )
{
m_cryptClass->encrypt();
}
}
void CryptEngine::decrypt()
{
//If crypttext present, set in CryptClass, decrypt, and fetch decrypted data
if( m_cryptClass->getCryptText().length() > 0 )
{
m_cryptClass->decrypt();
}
}
void CryptEngine::oncipherSelected_triggered(int cipher)
{
m_algorithm = cipher;
//Get Instance of Singleton mapping Integers to String for Cipher description
CiphersSingleton ciphers = CiphersSingleton::getInstance();
//Algorithm contains cipher as text.
QString algorithm = ciphers.textFromValue(m_algorithm);
//delete old CryptClass and create new one according to selected algorithm
if( algorithm == "NullCipher" )
{
delete m_cryptClass;
m_cryptClass = new CryptClassNullCipher;
qDebug("CryptEngine::oncipherSelected_triggered - NullCipher");
}
else if( algorithm == "Caesar" )
{
delete m_cryptClass;
m_cryptClass = new CryptClassCaesar;
qDebug("CryptEngine::oncipherSelected_triggered - Caesar");
}
else if( algorithm == "RC4" )
{
delete m_cryptClass;
m_cryptClass = new CryptClassRc4;
qDebug("CryptEngine::oncipherSelected_triggered - RC4");
}
else if( algorithm == "Cube" )
{
// delete m_cryptClass;
// m_cryptClass = new CryptClassCube;
qDebug("CryptEngine::oncipherSelected_triggered - Cube");
}
else if( algorithm == "AES" )
{
delete m_cryptClass;
m_cryptClass = new CryptAes;
qDebug("CryptEngine::oncipherSelected_triggered - AES");
}
else if( algorithm == "RSA" )
{
// delete m_cryptClass;
// m_cryptClass = new CryptClassRSA;
qDebug("CryptEngine::oncipherSelected_triggered - RSA");
}
else if( algorithm == "ECC" )
{
// delete m_cryptClass;
// m_cryptClass = new CryptClassECC;
qDebug("CryptEngine::oncipherSelected_triggered - ECC");
}
//Send Signal confirming if data is binary or not
emit binaryData( m_cryptClass->getBinaryData() );
}
void CryptEngine::onkeylengthChanged(int value, bool symmetric)
{
qDebug("CrptEngine::onkeylengthChanged - new Keylength: %d", value);
m_cryptClass->setKeyLength(value);
}
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