【Java】分享一个使用DES加密和解密的算法
分享一个使用DES加密和解密的算法,当前这个算法已经应用到项目中:
package com.util;

import java.net.URLDecoder;
import java.net.URLEncoder;
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;

import org.apache.commons.lang3.StringUtils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**

  • 加密/解密工具
    */
    public class EncrypDES {

    private final byte[] DESIV = new byte[] { 0x12, 0x34, 0x56, 120, (byte) 0x90, (byte) 0xab, (byte) 0xcd, (byte) 0xef };// 向量
    public static final String key_System = "9ba45bfd500642328ec03ad8ef1b6e75";// 自定义密钥
    private AlgorithmParameterSpec iv = null;// 加密算法的参数接口
    private Key key = null;
    private String charset = "utf-8";//默认编码

    /**

    • 初始化
    • @param deSkey 密钥
    • @throws Exception
      */
      public EncrypDES(String deSkey, String charset) throws Exception {
      if (StringUtils.isNotBlank(charset)) {
      this.charset = charset;
      }
      DESKeySpec keySpec = new DESKeySpec(deSkey.getBytes(this.charset));// 设置密钥参数
      iv = new IvParameterSpec(DESIV);// 设置向量
      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
      key = keyFactory.generateSecret(keySpec);// 得到密钥对象
      }

    /**

    • 加密
    • @param data
    • @return
    • @throws Exception
      */
      public String encode(String data) throws Exception {
      Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
      enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式,给出密钥和向量
      byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8"));
      BASE64Encoder base64Encoder = new BASE64Encoder();
      return URLEncoder.encode(base64Encoder.encode(pasByte));
      }

    /**

    • 解密
    • @param data
    • @return
    • @throws Exception
      */
      public String decode(String data) throws Exception {
      data=URLDecoder.decode(data);
      Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
      deCipher.init(Cipher.DECRYPT_MODE, key, iv);
      BASE64Decoder base64Decoder = new BASE64Decoder();
      byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
      return new String(pasByte, "UTF-8");
      }

    public static void main(String[] args) {
    try {
    String test = "www.java112.com";
    EncrypDES des = new EncrypDES(EncrypDES.key_System, "utf-8");
    System.out.println("加密前的字符:" + test);
    System.out.println("加密后的字符:" + des.encode(test));
    System.out.println("解密后的字符:" + des.decode(des.encode(test)));
    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    }
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