Java Des 加密与解密
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2024-03-13 23:00:22
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package com.sobot.util.crypto;
import java.io.IOException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Base64;
/**
* Des加密解密类
*
* @author sobot
*/
public class Des {
private final static String DES = "DES";
public static void main(String[] args) throws Exception {
String data = "123 456";
String key = "[email protected]#$%";
System.err.println(encrypt(data, key));
System.err.println(decrypt(encrypt(data, key), key));
}
/**
* DES字符串加密
* @param data 要加密的数据
* @param key 加***
* @return 加密后base64编码密文
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
byte[] bt = encrypt(data.getBytes(), key.getBytes());
String strs = Base64.encodeBase64String(bt);
return strs;
}
/**
* DES字符串解密
* @param data 要解密数据
* @param key 解***
* @return 解密后明文数据
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return null;
byte[] buf = Base64.decodeBase64(data);
byte[] bt = decrypt(buf,key.getBytes());
return new String(bt);
}
/**
* 对byte数组进行des加密
* @param data 加密数据byte数组
* @param key 加***byte数组
* @return 加密后byte数组
* @throws Exception
*/
private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始**数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个**工厂,然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用**初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
/**
* 对byte数组进行解密
* @param data 解密bute数组
* @param key 解***byte数组
* @return 解密后byte数组
* @throws Exception
*/
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始**数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个**工厂,然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用**初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
}
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