JAVA安卓和C# 3DES加密解密的兼容性问题

近 一个项目.net 要调用JAVA的WEB SERVICE，数据采用3DES加密，涉及到两种语言3DES一致性的问题，
下面分享一下，
这里的KEY采用Base64编码，便用分发，因为Java的Byte范围为-128至127，c#的Byte范围是0-255
核心是确定Mode和Padding，关于这两个的意思可以搜索3DES算法相关文章
一个是 C#采用 CBC Mode，PKCS7 Padding,Java采用CBC Mode，PKCS5Padding Padding,
另一个是C#采用ECB Mode，PKCS7 Padding,Java采用ECB Mode，PKCS5Padding Padding,
注意：Java的ECB模式不需要IV
对字符加密时，双方采用的都是UTF-8编码
下面是C#代码

 /// <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">密钥</param>
        /// <param name="iv">IV</param>
        /// <param name="data">明文的byte数组</param>
        /// <returns>密文的byte数组</returns>
        public static byte[] Des3EncodeCBC( byte[] key, byte[] iv, byte[] data )
        {
            //复制于MSDN

            try
            {
                // Create a MemoryStream.
                MemoryStream mStream = new MemoryStream();

                TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
                tdsp.Mode = CipherMode.CBC;             //默认值
                tdsp.Padding = PaddingMode.PKCS7;       //默认值

                // 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">密钥</param>
        /// <param name="iv">IV</param>
        /// <param name="data">密文的byte数组</param>
        /// <returns>明文的byte数组</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">密钥</param>
        /// <param name="iv">IV(当模式为ECB时，IV无用)</param>
        /// <param name="str">明文的byte数组</param>
        /// <returns>密文的byte数组</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">密钥</param>
        /// <param name="iv">IV(当模式为ECB时，IV无用)</param>
        /// <param name="str">密文的byte数组</param>
        /// <returns>明文的byte数组</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>
        /// 类测试
        /// </summary>
        public static void Test()
        {
            System.Text.Encoding utf8 = System.Text.Encoding.UTF8;

            //key为abcdefghijklmnopqrstuvwx的Base64编码
            byte[] key = Convert.FromBase64String( "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4" );
            byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };      //当模式为ECB时，IV无用
            byte[] data = utf8.GetBytes( "中国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();

        }

    }

下面是java代码

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="中国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 密钥
	 * @param data 明文
	 * @return Base64编码的密文
	 * @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 密钥
	 * @param data Base64编码的密文
	 * @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 密钥
	 * @param keyiv IV
	 * @param data 明文
	 * @return Base64编码的密文
	 * @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 密钥
	 * @param keyiv IV
	 * @param data Base64编码的密文
	 * @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;

	}

}

下面是运行结果
ECB模式:
rmWB4+r9Ug93WI0KAEuMig==
中国ABCabc123
CBC模式:
4aabWF8UFour/vNfnzJrjw==
中国ABCabc123

我自己的调用方法是

 1:  static void Main(string[] args)

 2:          {

 3:   

 4:              System.Text.Encoding utf8 = System.Text.Encoding.UTF8;

 5:   

 6:              byte[] key = utf8.GetBytes("lidashu2013_fromc#tojava");  //加密的密钥

 7:  

 8:              //----  加密

 9:              string str1 = "abc"; //准备要加密的原文

10:              byte[] byte1 = utf8.GetBytes(str1); //获得原文的字节

11:              byte[] byte2 = Des3.Des3EncodeECB(key, null, byte1);  //已经加密过的字节

12:              string str2 = Convert.ToBase64String(byte2);  //将字节转换为 Base64位的编码

13:              System.Console.WriteLine(str2);  //Pv8WLS7RSYRD8ushCAH/Zg==

14:  

15:  

16:              //---  解密

17:              string strJiaMi = "0TvZFgRLf5s=";   //需要解密的的密码

18:              byte[] alreadyEnCodeByte = Convert.FromBase64String(strJiaMi); //从Base64位转换为字节

19:              byte[] toDecodeByte = Des3.Des3DecodeECB(key, null, alreadyEnCodeByte);  //解密

20:              //将解密后的字节，转换成string字符串

21:              //(注意，如果解密出来的字符串的长度不是8的倍数，则会自动在后面补\0多次，例如解密出来是abcde,长度为5,则会变成 abc\0\0\0\0\0  加多3次)

22:              string strShow = System.Text.Encoding.Default.GetString(toDecodeByte);

23:              strShow = strShow.Replace("\0", "");

24:              System.Console.WriteLine(strShow); 

25:   

26:   

27:   

28:   

29:   

30:   

31:              Console.ReadKey();

32:          }

33:   

注意，如果是在C#端自己加密，自己解密的时候，会发现一个补\0的问题，例如 原文是    abcde  ，加密之后，再解密变成了   abcde\0\0\0

这里的\0的次数，是看你的原文和8相差多少，如果不够8位就补几次。原文是abcde是5位，则会自动补齐\0 补3次

如果是c#端加密，发给java解密，则不会有问题，不会存在\0的问题

如果是java端加密，发给c#解密，则还是会补\0

对于\0 我们应该人为的replace替换掉