C#和JAVA 3DES加密解密

最近 一個項目.net 要調用JAVA的WEB SERVICE，數據採用3DES加密，涉及到兩種語言3DES一致性的問題， 下面分享一下， 這裏的KEY採用Base64編碼，便用分發，因爲Java的Byte範圍爲-128至127，c#的Byte範圍是0-255 核心是確定Mode和Padding，關於這兩個的意思可以搜索3DES算法相關文章 一個是C#採用CBC Mode，PKCS7 Padding,Java採用CBC Mode，PKCS5Padding Padding, 另一個是C#採用ECB Mode，PKCS7 Padding,Java採用ECB Mode，PKCS5Padding Padding, Java的ECB模式不需要IV 對字符加密時，雙方採用的都是UTF-8編碼

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

/// <summary>  
    /// DES3加密解密  
    /// </summary>  
    public class Des3
    {
        #region CBC模式**
        /// <summary>  
        /// DES3 CBC模式加密  
        /// </summary>  
        /// <param name="key">密鑰</param>  
        /// <param name="iv">IV</param>  
        /// <param name="data">明文的byte數組</param>  
        /// <returns>密文的byte數組</returns>  
        public static byte[] Des3EncodeCBC(byte[] key, byte[] iv, byte[] data)
        {
            //複製於MSDN  
            try
            {
                // Create a MemoryStream.  
                MemoryStream mStream = new MemoryStream();
                TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
                tdsp.Mode = CipherMode.CBC;             //默認值  
                tdsp.Padding = PaddingMode.PKCS7;       //默認值  
                // Create a CryptoStream using the MemoryStream   
                // and the passed key and initialization vector (IV).  
                CryptoStream cStream = new CryptoStream(mStream,
                    tdsp.CreateEncryptor(key, iv),
                    CryptoStreamMode.Write);
                // Write the byte array to the crypto stream and flush it.  
                cStream.Write(data, 0, data.Length);
                cStream.FlushFinalBlock();
                // Get an array of bytes from the   
                // MemoryStream that holds the   
                // encrypted data.  
                byte[] ret = mStream.ToArray();
                // Close the streams.  
                cStream.Close();
                mStream.Close();
                // Return the encrypted buffer.  
                return ret;
            }
            catch (CryptographicException e)
            {
                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
                return null;
            }
        }
        /// <summary>  
        /// DES3 CBC模式解密  
        /// </summary>  
        /// <param name="key">密鑰</param>  
        /// <param name="iv">IV</param>  
        /// <param name="data">密文的byte數組</param>  
        /// <returns>明文的byte數組</returns>  
        public static byte[] Des3DecodeCBC(byte[] key, byte[] iv, byte[] data)
        {
            try
            {
                // Create a new MemoryStream using the passed   
                // array of encrypted data.  
                MemoryStream msDecrypt = new MemoryStream(data);
                TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
                tdsp.Mode = CipherMode.CBC;
                tdsp.Padding = PaddingMode.PKCS7;
                // Create a CryptoStream using the MemoryStream   
                // and the passed key and initialization vector (IV).  
                CryptoStream csDecrypt = new CryptoStream(msDecrypt,
                    tdsp.CreateDecryptor(key, iv),
                    CryptoStreamMode.Read);
                // Create buffer to hold the decrypted data.  
                byte[] fromEncrypt = new byte[data.Length];
                // Read the decrypted data out of the crypto stream  
                // and place it into the temporary buffer.  
                csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
                //Convert the buffer into a string and return it.  
                return fromEncrypt;
            }
            catch (CryptographicException e)
            {
                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
                return null;
            }
        }
        #endregion
        #region ECB模式
        /// <summary>  
        /// DES3 ECB模式加密  
        /// </summary>  
        /// <param name="key">密鑰</param>  
        /// <param name="iv">IV(當模式爲ECB時，IV無用)</param>  
        /// <param name="str">明文的byte數組</param>  
        /// <returns>密文的byte數組</returns>  
        public static byte[] Des3EncodeECB(byte[] key, byte[] iv, byte[] data)
        {
            try
            {
                // Create a MemoryStream.  
                MemoryStream mStream = new MemoryStream();
                TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
                tdsp.Mode = CipherMode.ECB;
                tdsp.Padding = PaddingMode.PKCS7;
                // Create a CryptoStream using the MemoryStream   
                // and the passed key and initialization vector (IV).  
                CryptoStream cStream = new CryptoStream(mStream,
                    tdsp.CreateEncryptor(key, iv),
                    CryptoStreamMode.Write);
                // Write the byte array to the crypto stream and flush it.  
                cStream.Write(data, 0, data.Length);
                cStream.FlushFinalBlock();
                // Get an array of bytes from the   
                // MemoryStream that holds the   
                // encrypted data.  
                byte[] ret = mStream.ToArray();
                // Close the streams.  
                cStream.Close();
                mStream.Close();
                // Return the encrypted buffer.  
                return ret;
            }
            catch (CryptographicException e)
            {
                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
                return null;
            }
        }
        /// <summary>  
        /// DES3 ECB模式解密  
        /// </summary>  
        /// <param name="key">密鑰</param>  
        /// <param name="iv">IV(當模式爲ECB時，IV無用)</param>  
        /// <param name="str">密文的byte數組</param>  
        /// <returns>明文的byte數組</returns>  
        public static byte[] Des3DecodeECB(byte[] key, byte[] iv, byte[] data)
        {
            try
            {
                // Create a new MemoryStream using the passed   
                // array of encrypted data.  
                MemoryStream msDecrypt = new MemoryStream(data);
                TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
                tdsp.Mode = CipherMode.ECB;
                tdsp.Padding = PaddingMode.PKCS7;
                // Create a CryptoStream using the MemoryStream   
                // and the passed key and initialization vector (IV).  
                CryptoStream csDecrypt = new CryptoStream(msDecrypt,
                    tdsp.CreateDecryptor(key, iv),
                    CryptoStreamMode.Read);
                // Create buffer to hold the decrypted data.  
                byte[] fromEncrypt = new byte[data.Length];
                // Read the decrypted data out of the crypto stream  
                // and place it into the temporary buffer.  
                csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
                //Convert the buffer into a string and return it.  
                return fromEncrypt;
            }
            catch (CryptographicException e)
            {
                Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
                return null;
            }
        }
        #endregion
        /// <summary>  
        /// 類測試  
        /// </summary>  
        public static void Test()
        {
            System.Text.Encoding utf8 = System.Text.Encoding.UTF8;
            //key爲abcdefghijklmnopqrstuvwx的Base64編碼  
            byte[] key = Convert.FromBase64String("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4");
            byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };      //當模式爲ECB時，IV無用  
            byte[] data = utf8.GetBytes("中國ABCabc123");
            System.Console.WriteLine("ECB模式:");
            byte[] str1 = Des3.Des3EncodeECB(key, iv, data);
            byte[] str2 = Des3.Des3DecodeECB(key, iv, str1);
            System.Console.WriteLine(Convert.ToBase64String(str1));
            System.Console.WriteLine(System.Text.Encoding.UTF8.GetString(str2));
            System.Console.WriteLine();
            System.Console.WriteLine("CBC模式:");
            byte[] str3 = Des3.Des3EncodeCBC(key, iv, data);
            byte[] str4 = Des3.Des3DecodeCBC(key, iv, str3);
            System.Console.WriteLine(Convert.ToBase64String(str3));
            System.Console.WriteLine(utf8.GetString(str4));
            System.Console.WriteLine();
        }
    }

接着是Java代碼

import java.security.Key;  
import javax.crypto.Cipher;  
import javax.crypto.SecretKeyFactory;  
import javax.crypto.spec.DESedeKeySpec;  
import javax.crypto.spec.IvParameterSpec;  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
public class Des3 {  
    public static void main(String[] args) throws Exception {  
        byte[] key=new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4");  
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };  
        byte[] data="中國ABCabc123".getBytes("UTF-8");  
          
        System.out.println("ECB加密解密");  
        byte[] str3 = des3EncodeECB(key,data );  
        byte[] str4 = ees3DecodeECB(key, str3);  
        System.out.println(new BASE64Encoder().encode(str3));  
        System.out.println(new String(str4, "UTF-8"));  
        System.out.println();  
        System.out.println("CBC加密解密");  
        byte[] str5 = des3EncodeCBC(key, keyiv, data);  
        byte[] str6 = des3DecodeCBC(key, keyiv, str5);  
        System.out.println(new BASE64Encoder().encode(str5));  
        System.out.println(new String(str6, "UTF-8"));  
    }  
    /** 
     * ECB加密,不要IV 
     * @param key 密鑰 
     * @param data 明文 
     * @return Base64編碼的密文 
     * @throws Exception 
     */  
    public static byte[] des3EncodeECB(byte[] key, byte[] data)  
            throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(key);  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");  
        cipher.init(Cipher.ENCRYPT_MODE, deskey);  
        byte[] bOut = cipher.doFinal(data);  
        return bOut;  
    }  
    /** 
     * ECB解密,不要IV 
     * @param key 密鑰 
     * @param data Base64編碼的密文 
     * @return 明文 
     * @throws Exception 
     */  
    public static byte[] ees3DecodeECB(byte[] key, byte[] data)  
            throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(key);  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");  
        cipher.init(Cipher.DECRYPT_MODE, deskey);  
        byte[] bOut = cipher.doFinal(data);  
        return bOut;  
    }  
    /** 
     * CBC加密 
     * @param key 密鑰 
     * @param keyiv IV 
     * @param data 明文 
     * @return Base64編碼的密文 
     * @throws Exception 
     */  
    public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data)  
            throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(key);  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");  
        IvParameterSpec ips = new IvParameterSpec(keyiv);  
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);  
        byte[] bOut = cipher.doFinal(data);  
        return bOut;  
    }  
    /** 
     * CBC解密 
     * @param key 密鑰 
     * @param keyiv IV 
     * @param data Base64編碼的密文 
     * @return 明文 
     * @throws Exception 
     */  
    public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data)  
            throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(key);  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");  
        IvParameterSpec ips = new IvParameterSpec(keyiv);  
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);  
        byte[] bOut = cipher.doFinal(data);  
        return bOut;  
    }

ECB模式:
rmWB4+r9Ug93WI0KAEuMig==
中國ABCabc123

CBC模式:
4aabWF8UFour/vNfnzJrjw==
中國ABCabc123

特別注意：

1當 key 是中文的時候

byte[] key = Convert.FromBase64String( "我是中國人" );   執行會報錯，只支持英文或者數字

2.當key的長度不是24時候回報錯 :"指定鍵的大小對於此算法無效"

解決辦法如下：

 var miyaoBytes = System.Text.Encoding.UTF8.GetBytes("我是中國人");
            var key = new byte[24];
            for (int i = 0; (i < miyaoBytes.Length) && i<24; i++)
            {
                key[i] = miyaoBytes[i];
            }
            var iv = new byte[] { 1,2,3,4,5,6,7,8};

            var data= System.Text.Encoding.UTF8.GetBytes("加密前的數據");

            var ll = Des3.Des3EncodeECB(key, iv, data);
           var res =  Convert.ToBase64String(ll);
          var te= Des3.Des3DecodeECB(key, iv, ll);
           MessageBox.Show(System.Text.Encoding.UTF8.GetString(te));

如果對加密後得到的 byte數組 進行  var res = Convert.ToBase64String(ll);    是不能夠直接調用解密方法進行解密的負責會報錯。     

轉換後必須  調用 byteToHexStr(); 把byte數組轉化爲  16進制字符串

var bytes = Des3.Des3EncodeECB(key, iv, data);

var jiamiHou = byteToHexStr(bytes);

然後進行解密，同樣解密前先轉化爲 16進制數組然後再進行解密：

var bytes =   strToToHexByte(jiamiHou);

Des3.Des3DecodeECB(key, iv, ll);          

/// <summary>
        /// 字符串轉16進制字節數組
        /// </summary>
       /// <param name="hexString"></param>
        /// <returns></returns>
        private static byte[] strToToHexByte(string hexString)
        {
             hexString = hexString.Replace(" ", "");
           if ((hexString.Length % 2) != 0)
                 hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
         }
 
 

/// <summary>
        /// 字節數組轉16進制字符串
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static string byteToHexStr(byte[] bytes)
       {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                     returnStr += bytes[i].ToString("X2");
                 }
             }
            return returnStr;
         }

原文地址：http://www.cnblogs.com/liluping860122/p/4026015.html