billp / vpccmcrypt Goto Github PK

import java.math.BigInteger;
import java.security.*;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.modes.CCMBlockCipher;
import org.bouncycastle.crypto.params.CCMParameters;
import org.bouncycastle.crypto.params.KeyParameter;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class ADYDecrypt
{
  private static String AES = "AES";

  public static byte[] hexStringToByteArray(String s) {
    int len = s.length();
    byte[] data = new byte[len / 2];
    for (int i = 0; i < len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
                             + Character.digit(s.charAt(i+1), 16));
    }
    return data;
}

  public static void main(String[] args)
  {

    try {

      byte[] encrypted = hexStringToByteArray(args[0]);
      byte[] keybytes = hexStringToByteArray("366D2C7804AEC975A7AB66BCF7B4A3DFA86476CCC5EFC7062CD2E80471FD663E");
      SecretKey key = new SecretKeySpec(keybytes, AES);
      byte[] iv = hexStringToByteArray("547971D2272DFA601147C8C1");
      byte[] plain;

      Security.addProvider(new BouncyCastleProvider());
      Cipher cipher = Cipher.getInstance("AES/CCM/NoPadding");
      cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
      plain = cipher.doFinal(encrypted);


      System.out.println(args[0] + " -> " + new String(plain));
    } catch (Exception e) {
      System.out.println(e.getMessage());
    }

  }
}