C#MD5加密转Java

所剩无几 2014-07-17 10:46:13

前些天，我要和学长一起开发一个程序，因为有网页部分和Android部分，在一个服务器下运行。
要把C#的MD5加密转换Java代码。
下面是C#部分的代码，我把Key屏蔽了，Key要自己写。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

/// <summary>
///MD5Pwd 的摘要说明
/// </summary>
public class MD5Pwd
{
private static String Key;
public MD5Pwd()
{
Key = "************;//密钥自己添加。根据这个密钥来算出你的密码
}
//创建密钥
///MD5加密
public string MD5Encrypt(string pToEncrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(Key);
des.IV = ASCIIEncoding.ASCII.GetBytes(Key);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}

///MD5解密
public string MD5Decrypt(string pToDecrypt)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}

des.Key = ASCIIEncoding.ASCII.GetBytes(Key);
des.IV = ASCIIEncoding.ASCII.GetBytes(Key);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
}

由于java没有DESCryptoServiceProvider等这些类，好多事情比较难办。在网上搜到一些资源，汇总精简一下来贴出我的java代码
package com;

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

public class Des {
// 新建一个私有数组
private byte[] desKey;
static String key = "********";//老规矩key要自己制定。

//解密
public static String decrypt(String message) throws Exception {

byte[] bytesrc = convertHexString(message);

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}
// 加密
public static byte[] encrypt(String message)
throws Exception {

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

return cipher.doFinal(message.getBytes("UTF-8"));

}
// 转为16进制数组二进制
public static byte[] convertHexString(String ss)

{
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++)
{
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest = (byte) byteValue;
}

return digest;

}
//转为16进制
public static String toHexString(byte b[]) {

StringBuffer hexString = new StringBuffer();

for (int i = 0; i < b.length; i++) {

String plainText = Integer.toHexString(0xff & b);

if (plainText.length() < 2)

plainText = "0" + plainText;

hexString.append(plainText);

}

return hexString.toString();

}

}

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