如何用DES算法实现加解密？

如何用DES算法实现加解密？这篇文章运用了实例代码展示，代码非常详细，可供感兴趣的小伙伴们参考借鉴，希望对大家有所帮助。

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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