DES加密算法

标签：tmp   有一个   @param   cat   throws   rgs   数据源   decrypt   完成   

package com.wondersgroup.ybServices.web;

import java.security.SecureRandom;

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

public class EncryptUtil {

public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成一个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);
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 正式执行加密操作
return cipher.doFinal(src);
}

/**
* @param password 密码
* @param key 加密字符串
* @return
* @throws Exception
*/
public final static String encrypt(String password, String key) throws Exception {
try {
return byte2String(encrypt(password.getBytes(), key.getBytes("gbk")));
} catch (Exception e) {
throw new Exception("加密失败");
}
}

public static String byte2String(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
}
return hs.toUpperCase();
}

private final static String DES = "DES";

/**
* @param src 数据源
* @param key 密钥，长度必须是8的倍数
* @return
* @throws Exception
*/
public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成一个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);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

// 正式执行解密操作
return cipher.doFinal(src);
}

public final static String decrypt(String data, String key) throws Exception {
try {
return new String(decrypt(String2byte(data.getBytes()), key.getBytes()),"gbk");
} catch (Exception e) {
throw new Exception("解密失败");
}
}

public static byte[] String2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException("长度不是偶数");
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}

public static void main(String[] args) {
String encryptString = null;
try {
//encryptString = encrypt("{\"username\":\"320623198906237206\",\"password\":\"147165\",\"itype\":\"1\"}","kdl805jz");
encryptString = encrypt("{\"username\":\"1000281946\",\"password\":\"874209\",\"itype\":\"2\"}","@Ew6DS6&*xN!43DR");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(encryptString);//输出：D993B450D30DC80B9268D68C0C0E60FF

String desencryptString = null;
try {
desencryptString = decrypt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w6DS6&*xN!43DR");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(desencryptString);
}

//输出：is张三丰

}

DES加密算法

标签：tmp   有一个   @param   cat   throws   rgs   数据源   decrypt   完成   

原文地址：https://www.cnblogs.com/lifan12589/p/11712160.html