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/**
* @file AESCrypt.cpp
* @brief AESCrypt class definitions
* @author manzerbredes
* @date 8 Mars 2015
*
* Contain all definitions of AESCrypt class.
*
*/
//----- class -----
#include "AESCrypt.hpp"
//Constructor
AESCrypt::AESCrypt(){
this->hash=HASHCrypt(); //Init hash attribute
}
//Destructor
AESCrypt::~AESCrypt(){
}
//Encrypt string with string key
std::string AESCrypt::encrypt(std::string key, std::string data){
//Generate SHA-256
byte digest[32];
hash.getSHA_256(key, digest, (int)sizeof(digest));
return encryptRoutine(data, digest, sizeof(digest));
}
//Encrypt string with byte* key
std::string AESCrypt::encrypt(byte* key, std::string data){
return encryptRoutine(data, key, 32);
}
//The encryptRoutine
std::string AESCrypt::encryptRoutine(std::string data, byte* digest, int size){
//Contain data encrypted
std::string cipher;
//Use try, catch to be ensure no problems happening
try{
//Create encoder to encrypt data
CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption encoder;
encoder.SetKey( digest, size );
//Encrypt data with StreamTransformationFilter with NO PADDING
CryptoPP::StringSource ss1(data, true,
new CryptoPP::StreamTransformationFilter( encoder,
new CryptoPP::StringSink( cipher ),
CryptoPP::StreamTransformationFilter::ZEROS_PADDING
)
);
}
catch( CryptoPP::Exception& e )
{
std::cerr << e.what() << std::endl;
exit(EXIT_FAILURE);
}
//return encrypted data
return cipher;
}
//Decrypt string
std::string AESCrypt::decrypt(std::string key, std::string data){
//Get SHA-256
byte digest[32];
hash.getSHA_256(key, digest, (int)sizeof(digest));
//Contain data decrypted
std::string cipher;
//Use try, catch to be ensure no problems happening
try {
//Create decoder to encrypt data
CryptoPP::ECB_Mode< CryptoPP::AES >::Decryption decoder;
decoder.SetKey( digest, sizeof(digest) );
//Decrypt data with StreamTransformationFilter with NO PADDING
CryptoPP::StringSource ss3( data, true,
new CryptoPP::StreamTransformationFilter( decoder,
new CryptoPP::StringSink( cipher ),
CryptoPP::StreamTransformationFilter::NO_PADDING
)
);
}
catch( CryptoPP::Exception& e )
{
std::cerr << e.what() << std::endl;
exit(1);
}
//Remove ZEROS padding
int i=0;
for(i=0;i<cipher.length();i++){
if(cipher[i]=='\0')
break;
}
cipher.erase(i,cipher.length()-1); //Erase ZEROS
//return decrypted data
return cipher;
}
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