3DES加密 java与 C# 可以相互加密解密

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,
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

/// 

    /// DES3加密解密
    /// 
    public class Des3
    {
        #region CBC模式**
        /// 

        /// DES3 CBC模式加密
        /// 
        /// 密钥
        /// IV
        /// 明文的byte数组
        /// 密文的byte数组
        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;
            }
        }
        /// 

        /// DES3 CBC模式解密
        /// 
        /// 密钥
        /// IV
        /// 密文的byte数组
        /// 明文的byte数组
        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
        /// 

        /// DES3 ECB模式加密
        /// 
        /// 密钥
        /// IV(当模式为ECB时，IV无用)
        /// 明文的byte数组
        /// 密文的byte数组
        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;
            }
        }
        /// 

        /// DES3 ECB模式解密
        /// 
        /// 密钥
        /// IV(当模式为ECB时，IV无用)
        /// 密文的byte数组
        /// 明文的byte数组
        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
        /// 

        /// 类测试
        /// 
        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();
        }
    }

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;
    }
}