一个java的des加密解密代码如下：
//package com.visionsky.util; import java.security.*;
//import java.util.regex.Pattern;
//import java.util.Hashtable;
import javax.crypto.*;
import javax.crypto.spec.*; import sun.misc.*; /**
* des加密解密
*/
public class DESPlus {
private static String strDefaultKey = "PLFP"; //默认密钥 private static final byte[] iv = {0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xab, (byte) 0xcd, (byte) 0xef};//des 向量 private static BASE64Encoder enc = new BASE64Encoder();//将byte[]转换成String private static BASE64Decoder dec = new BASE64Decoder(); //将String转换成byte[] /**
* 加密字节数组
*
* @param arrB
* 需加密的字节数组
* @param key
* 密钥
* @return 加密后的字节数组
* @throws Exception
*/
public static byte[] encrypt(byte[] arrB, String key) throws Exception {
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec ivp = new IvParameterSpec(DESPlus.iv); Cipher encryptCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
encryptCipher.init(Cipher.ENCRYPT_MODE, secretKey, ivp); return encryptCipher.doFinal(arrB);
} /**
* 加密字符串
*
* @param xml
* 需加密的字符串
* @param key
* 密钥
* @return 加密后的字符串
* @throws Exception
*/
public static String encrypt(String xml, String key) throws Exception {
//return DESPlus.enc.encode(encrypt(xml.getBytes(), key));
return new String(encrypt(xml.getBytes(), key));
} /**
* 使用默认公钥加密字符串
* @param xml 需加密的字符串
* @return 加密后的字符串
* @throws Exception
*/
public static String encrypt(String xml) throws Exception {
return encrypt(xml, strDefaultKey);
} /**
* 解密字节数组
*
* @param arrB
* 需解密的字节数组
* @param key
* 密钥
* @return 解密后的字节数组
* @throws Exception
*/
public static byte[] decrypt(byte[] arrB, String key) throws Exception {
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec ivp = new IvParameterSpec(DESPlus.iv); Cipher decryptCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
decryptCipher.init(Cipher.DECRYPT_MODE, secretKey, ivp); return decryptCipher.doFinal(arrB);
} /**
* 解密字符串
*
* @param xml
* 需解密的字符串
* @param key
* 密钥
* @return 解密后的字符串
* @throws Exception
*/
public static String decrypt(String xml, String key) throws Exception {
return new String(decrypt(DESPlus.dec.decodeBuffer(xml), key));
} /**
* 使用默认公钥解密字符串
* @param xml 需解密的字符串
* @return 解密后的字符串
* @throws Exception
*/
public static String decrypt(String xml) throws Exception {
return decrypt(xml, strDefaultKey);
} /**
* 从指定字符串生成密钥，密钥所需的字节数组长度为8位 不足8位时后面补0，超出8位只取前8位
*
* @param arrBTmp
* 构成该字符串的字节数组
* @return 生成的密钥
* @throws java.lang.Exception
*/
private Key getKey(byte[] arrBTmp) throws Exception {
// 创建一个空的8位字节数组（默认值为0）
byte[] arrB = new byte[8]; // 将原始字节数组转换为8位
for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
} // 生成密钥
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES"); return key;
} /**
* 获取默认密钥
* @return
*/
public static String getDesKey() {
return DESPlus.strDefaultKey;
} public static void main(String[] args) {
try {
//测试密匙
String key = "BOC_PLFP";
//004交易案例
String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><ROOT><HEADER><TRANNO>004</TRANNO><BNKNO>17850</BNKNO><COMNO>COM01</COMNO><SN>1109141222222660161</SN></HEADER><BODY><TRANLOG><APPNO>0000000123</APPNO><NOTATION>客户信息不完整，请补充资料。</NOTATION></TRANLOG></BODY></ROOT>"; System.out.println("密钥：" + key);
System.out.println("加密前的字符串：" + xml);
System.out.println("加密前的字符串长度：" + xml.getBytes().length); //加密
xml = DESPlus.encrypt(xml, key);
System.out.println("加密后的字符串：" + xml);
System.out.println("加密后的字符串长度：" + xml.getBytes().length); //解密
xml = DESPlus.decrypt(xml, key);
System.out.println("解密后的字符串：" + xml);
System.out.println("解密后的字符串长度：" + xml.getBytes().length); } catch (Exception e) {
e.printStackTrace();
}
}
}
上面运行结果为：
密钥：BOC_PLFP
加密前的字符串：<?xml version="1.0" encoding="UTF-8"?><ROOT><HEADER><TRANNO>004</TRANNO><BNKNO>17850</BNKNO><COMNO>COM01</COMNO><SN>1109141222222660161</SN></HEADER><BODY><TRANLOG><APPNO>0000000123</APPNO><NOTATION>客户信息不完整，请补充资料。</NOTATION></TRANLOG></BODY></ROOT>
加密前的字符串长度：262
加密后的字符串：bE5N44gjyfO3SdUs6/OhVg4I4l725S2vWcKBRxYOAd/eAnyuADKXeNNgVXJMj3aJJzndntv364rh
YW2bF33lmEABMU43HfS8DcXX7+QrcIjp3mrk7uJdiNHu4T4oHMeqetFZqU5oh2XY1sbBPPdGEgMf
/OguRVaTblzl/ylkFc6C9BNNSD0IwL0Ks7Mi73+V76P+aFdPgXQc7u4Vkq8Cd6+HgHErbHbJI729
JPJKM5L2YAAW4Q06oi4yMoEASDjYf7Aa1X/FWqclsZImSDB0okGOiuj857l94BM1zYl2RtWdXa9o
0beiL4CbEvKSC3U3PydAI0+mZbtE0sVkyP0sXTke7ifrwiMG
加密后的字符串长度：360
解密后的字符串：<?xml version="1.0" encoding="UTF-8"?><ROOT><HEADER><TRANNO>004</TRANNO><BNKNO>17850</BNKNO><COMNO>COM01</COMNO><SN>1109141222222660161</SN></HEADER><BODY><TRANLOG><APPNO>0000000123</APPNO><NOTATION>客户信息不完整，请补充资料。</NOTATION></TRANLOG></BODY></ROOT>
解密后的字符串长度：262
参考了http://www.lijingquan.net/des-c-php-java.html一文，修改里面的des向量iv，字符编码UTF8为Default等，最终
改写为C#代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography; public class DES
{
private const string defaultKey = "BOC_PLFP"; //默认密钥
private static byte[] iv = { 0x12, 0x34, 0x56, 0x78, (byte)0x90, (byte)0xab, (byte)0xcd, (byte)0xef };//des 向量 /// <summary>
/// des加密
/// </summary>
/// <param name="pToEncrypt">要加密的字符串。</param>
/// <param name="sKey">密钥，且必须为8位。默认公钥加密字符串defaultKey</param>
/// <returns>以Base64格式返回的加密字符串。</returns>
public static string Encrypt(string pToEncrypt, string sKey = defaultKey)
{
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = iv; //ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return str;
}
} /// <summary>
/// des解密
/// </summary>
/// <param name="pToDecrypt">要解密的以Base64</param>
/// <param name="sKey">密钥，且必须为8位。默认公钥解密字符串defaultKey</param>
/// <returns>已解密的字符串。</returns>
public static string Decrypt(string pToDecrypt, string sKey = defaultKey)
{
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = iv; // ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.Default.GetString(ms.ToArray());
ms.Close();
return str;
}
}
}
经测试，加密和解密的结果和java的一样。