DESCode

Posted 2020-12-27 blakflash000

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.NoSuchAlgorithmException;

public class DESCoder {

    public static final String ALGORITHM = "DES";

    private static SecretKey toKey(byte[] key) throws Exception {
        DESKeySpec dks = new DESKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey secretKey = keyFactory.generateSecret(dks);

        return secretKey;
    }


    public static byte[] decrypt(byte[] data, byte[] key) {
        byte[] bytes = new byte[0];
        try {
            SecretKey k = toKey(key);
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, k);
            bytes = cipher.doFinal(data);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bytes;
    }


    public static byte[] encrypt(byte[] data, byte[] key) {
        Cipher cipher;
        byte[] ret_byte = null;
        try {
            SecretKey k = toKey(key);
            cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, k);
            ret_byte = cipher.doFinal(data);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ret_byte;
    }
}