C#中TripleDES对应Java中的DESede即大家说的3DES，附C#及Java加解密结果一致的控制台程序例子

直接上代码了。

Java控制台代码：

package Test;

import java.security.Key;

import javax.crypto.Cipher;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESedeKeySpec;

import javax.crypto.spec.IvParameterSpec;

import org.apache.commons.codec.binary.Base64;

public class Test {

    private static final String encoding = "UTF-8";

    public static void main(String[] args) {

        try {

            String text = "20200121";// 明文

            String key = "Tt3rLPrDIVIhXqAz";// 长度控制为16，作为3DES加密用的key

            String encryptStr = EncryptData(text, key);// 3DES加密结果

            System.out.println("明文：" + text);

            System.out.println("密钥：" + key);

            System.out.println("密文：" + encryptStr);

            System.out.println("解密：" + DecryptData(encryptStr, key));

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    /**

     * DESede加密，key长度为16

     *

     * @param plainText 明文

     * @param key       密钥

     * @return DESede加密结果

     * @throws Exception

     */

    static String EncryptData(String plainText, String key) throws Exception {

        byte[] keyBytes = key.getBytes(encoding);

        if (keyBytes.length == 16) { // short key ? .. extend to 24 byte key

            byte[] tmpKey = new byte[24];

            System.arraycopy(keyBytes, 0, tmpKey, 0, 16);

            System.arraycopy(keyBytes, 0, tmpKey, 16, 8);

            keyBytes = tmpKey;

        }

        Key deskey = null;

        DESedeKeySpec spec = new DESedeKeySpec(keyBytes);

        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");

        deskey = keyfactory.generateSecret(spec);

        Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");

        if (keyBytes.length > 8) {

            byte[] tmpKey = new byte[8];

            System.arraycopy(keyBytes, 0, tmpKey, 0, 8);

            keyBytes = tmpKey;

        }

        IvParameterSpec ips = new IvParameterSpec(keyBytes);

        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);

        byte[] bOut = cipher.doFinal(plainText.getBytes(encoding));

        return Base64.encodeBase64String(bOut);

    }

    /**

     * DESede解密，key长度为16

     *

     * @param input DESede加密的结果

     * @param key   密钥

     * @return DESede解密结果

     * @throws Exception

     */

    static String DecryptData(String input, String key) throws Exception {

        byte[] keyBytes = key.getBytes(encoding);

        if (keyBytes.length == 16) { // short key ? .. extend to 24 byte key

            byte[] tmpKey = new byte[24];

            System.arraycopy(keyBytes, 0, tmpKey, 0, 16);

            System.arraycopy(keyBytes, 0, tmpKey, 16, 8);

            keyBytes = tmpKey;

        }

        Key deskey = null;

        DESedeKeySpec spec = new DESedeKeySpec(keyBytes);

        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");

        deskey = keyfactory.generateSecret(spec);

        Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");

        if (keyBytes.length > 8) {

            byte[] tmpKey = new byte[8];

            System.arraycopy(keyBytes, 0, tmpKey, 0, 8);

            keyBytes = tmpKey;

        }

        IvParameterSpec ips = new IvParameterSpec(keyBytes);

        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);

        byte[] bOut = cipher.doFinal(Base64.decodeBase64(input));

        return new String(bOut, encoding);

    }

}

C#控制台代码：

using System;

using System.Text;

using System.Security.Cryptography;

using System.IO;

namespace Test

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                String text = "";// 明文

                String key = "Tt3rLPrDIVIhXqAz";// 长度控制为16，作为3DES加密用的key

                String encryptStr = EncryptData(text, key);// 3DES加密结果

                Console.WriteLine("明文：" + text);

                Console.WriteLine("密钥：" + key);

                Console.WriteLine("密文：" + encryptStr);

                Console.WriteLine("解密：" + DecryptData(encryptStr, key));

                Console.Read();

            }

            catch (Exception ex)

            {

                Console.WriteLine("运行异常，异常信息：" + ex.Message + ex.StackTrace);

                Console.WriteLine("按任意键退出重试");

                Console.Read();

            }

        }

        /// <summary>

        /// TripleDES加密，key长度为16

        /// </summary>

        /// <param name="plainText">明文</param>

        /// <param name="key">密钥</param>

        /// <returns>TripleDES加密结果</returns>

        public static string EncryptData(string plainText, string key)

        {

            TripleDESCryptoServiceProvider Tripledes = new TripleDESCryptoServiceProvider();

            //Tripledes.Mode = CipherMode.ECB;

            //Tripledes.Padding = PaddingMode.PKCS7;

            byte[] b_input = Encoding.UTF8.GetBytes(plainText);

            byte[] b_key = Encoding.UTF8.GetBytes(key);

            MemoryStream tempStream = new MemoryStream();

            //rgbKey即用于对称算法的密钥、rgbIV即用于对称算法的初始化向量，这里均使用b_key

            CryptoStream encStream = new CryptoStream(tempStream, Tripledes.CreateEncryptor(b_key, b_key), CryptoStreamMode.Write);

            encStream.Write(b_input, , b_input.Length);

            encStream.Close();

            return Convert.ToBase64String(tempStream.ToArray());

        }

        /// <summary>

        /// TripleDES解密，key长度为16

        /// </summary>

        /// <param name="input">TripleDES加密的结果</param>

        /// <param name="key">密钥</param>

        /// <returns>TripleDES解密结果</returns>

        public static string DecryptData(string input, string key)

        {

            TripleDESCryptoServiceProvider Tripledes = new TripleDESCryptoServiceProvider();

            byte[] b_input = Convert.FromBase64String(input);

            byte[] b_key = Encoding.UTF8.GetBytes(key);

            MemoryStream tempStream = new MemoryStream();

            //rgbKey即用于对称算法的密钥、rgbIV即用于对称算法的初始化向量，这里均使用b_key

            CryptoStream encStream = new CryptoStream(tempStream, Tripledes.CreateDecryptor(b_key, b_key), CryptoStreamMode.Write);

            encStream.Write(b_input, , b_input.Length);

            encStream.FlushFinalBlock();

            return Encoding.UTF8.GetString(tempStream.ToArray());

        }

    }

}

Java和C#运行结果一致，如下：

明文：20200121
密钥：Tt3rLPrDIVIhXqAz
密文：jHaDswvQaPn4ZvashXOTNQ==
解密：20200121

本文首发于我的CSDN博客：https://blog.csdn.net/n_ithero/article/details/104061959