java进行DES加密

package com.icbc.api.test;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;

/**
 * 描述：3des加密
 *
 * @author wangcheng
 * @create 2019-06-13-16:20
 */
public class TDESDemo {
    public static String tdes_key="cputest";
    public static void main(String[] args) throws Exception {
        String[] args1 = new String[1];
        args1[0] = "123";
        System.out.println(des_encode(args1));
        String[] args2 = new String[1];
        args2[0] = des_encode(args1);
        System.out.println(des_decode(args2));
    }
    public static String des_encode(String[] args) throws Exception {
        String des_key = tdes_key;
        Key key = Get3DESKey(des_key.getBytes());
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(1, key);
        return byteArr2HexStr(cipher.doFinal(args[0].getBytes()));
    }
    public static String des_decode( String[] args) throws Exception {


            String des_key = tdes_key;
            Key key = Get3DESKey(des_key.getBytes());

            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(2, key);
            return new String(cipher.doFinal(hexStr2ByteArr(args[0])));

    }
    private static Key Get3DESKey(byte[] key) throws Exception {
        byte[] tmpKey = new byte[8];

        for (int i = 0; (i < key.length) && (i < tmpKey.length); ++i) {
            tmpKey[i] = key[i];
        }

        SecretKeySpec secretKeySpec = new SecretKeySpec(tmpKey, "DES");

        return secretKeySpec;
    }
    public static String byteArr2HexStr(byte[] value) throws Exception {
        int i = value.length;

        StringBuffer buf = new StringBuffer(i * 2);
        for (int j = 0; j < i; ++j) {
            int k = value[j];

            while (k < 0) {
                k += 256;
            }

            if (k < 16)
                buf.append("0");

            buf.append(Integer.toString(k, 16));
        }
        return buf.toString();
    }
    public static byte[] hexStr2ByteArr(String value) throws Exception {
        byte[] bs1 = value.getBytes();
        int i = bs1.length;

        byte[] bs2 = new byte[i / 2];
        for (int j = 0; j < i; j += 2) {
            String str = new String(bs1, j, 2);
            bs2[(j / 2)] = (byte) Integer.parseInt(str, 16);
        }
        return bs2;
    }
}