encode a string by key using DES - Android java.security

Android examples for java.security:DES

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Description

encode a string by key using DES

Demo Code


//package com.java2s;

import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class Main {
    public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";

    public static String encode(String key, String data) {
        if (data == null)
            return null;
        try {//from   ww  w . j  a  va 2  s  .co  m
            DESKeySpec dks = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory
                    .getInstance("DES");

            Key secretKey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
            IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
            AlgorithmParameterSpec paramSpec = iv;
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
            byte[] bytes = cipher.doFinal(data.getBytes());
            return byte2hex(bytes);
        } catch (Exception e) {
            e.printStackTrace();
            return data;
        }
    }

    private static String byte2hex(byte[] b) {
        StringBuilder hs = new StringBuilder();
        String stmp;
        for (int n = 0; b != null && n < b.length; n++) {
            stmp = Integer.toHexString(b[n] & 0XFF);
            if (stmp.length() == 1)
                hs.append('0');
            hs.append(stmp);
        }
        return hs.toString().toUpperCase();
    }
}

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