3Des加解密 C#--->Java

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。

1. C#采用CBC Mode，PKCS7 Padding,Java采用CBC Mode，PKCS5Padding Padding
2. C#采用ECB Mode，PKCS7 Padding,Java采用ECB Mode，PKCS5Padding Padding
   其中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

C#

/// <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();  
    }  
}

java

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;  
    }
}