Криптография: приведите пример шифрования алгоритма Serpent

AutoSeededRandomPool prng;
 
SecByteBlock key(Serpent::DEFAULT_KEYLENGTH);
prng.GenerateBlock(key, key.size());
 
byte iv[Serpent::BLOCKSIZE];
prng.GenerateBlock(iv, sizeof(iv));
 
string plain = "CBC Mode Test";
string cipher, encoded, recovered;
 
/*********************************\
\*********************************/
 
try
{
    cout << "plain text: " << plain << endl;
 
    CBC_Mode< Serpent >::Encryption e;
    e.SetKeyWithIV(key, key.size(), iv);
 
    // The StreamTransformationFilter adds padding
    //  as required. ECB and CBC Mode must be padded
    //  to the block size of the cipher.
    StringSource ss1(plain, true, 
        new StreamTransformationFilter(e,
            new StringSink(cipher)
        ) // StreamTransformationFilter
    ); // StringSource
}
catch(const CryptoPP::Exception& e)
{
    cerr << e.what() << endl;
    exit(1);
}
 
/*********************************\
\*********************************/
 
// Pretty print
StringSource ss2(cipher, true,
    new HexEncoder(
        new StringSink(encoded)
    ) // HexEncoder
); // StringSource
 
cout << "cipher text: " << encoded << endl;
 
/*********************************\
\*********************************/
 
try
{
    CBC_Mode< Serpent >::Decryption d;
    d.SetKeyWithIV(key, key.size(), iv);
 
    // The StreamTransformationFilter removes
    //  padding as required.
    StringSource ss3(cipher, true, 
        new StreamTransformationFilter(d,
            new StringSink(recovered)
        ) // StreamTransformationFilter
    ); // StringSource
 
    cout << "recovered text: " << recovered << endl;
}
catch(const CryptoPP::Exception& e)
{
    cerr << e.what() << endl;
    exit(1);
}