/**
* Dekodiert einen Block mit DES
*
* @param key Byte-Array enthält den 3DES-Schlüssel
* @param z verschlüsselter Block
* @return entschlüsselter block
*/
@Override
public byte[] decryptBlock(byte[] key, byte[] z) {
byte[] s = new byte[16];
KeyParameter encKey = new KeyParameter(key);
BlockCipher cipher = new DESedeEngine();
cipher.init(false, encKey);
cipher.processBlock(z, 0, s, 0);
return s;
}
