Java和C#中3DES的加密与解密
发布日期:2021-07-13 02:57:12
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分类:技术文章
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最近在工作中遇到将Java环境的一个用户ID用表单形式传递给.net环境做校验,考虑到不能将用户ID作为明文传递,因此利用简单的3DES进行加密解密操作。
需要注意的就是:
(1)两种环境下3DES加密解密的一致性问题:C#会对解密生成的byte在不满足长度16时,自动填充'/0'直至长度为16,因此在接收到Java端的加密数据后,我们要对生成的byte做处理把末尾的'\0'去掉。
(2)另外在传输上我们采用BASE64编码传输,一方面它具有简单的不可读性,另一方面它能规避一些特殊字符的传输问题。
下面的Java中3DES加密解密的示例代码:
import java.security.Key;import java.io.IOException;import java.security.InvalidKeyException;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESedeKeySpec;import javax.crypto.spec.IvParameterSpec;import java.util.Scanner;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class destest { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub byte[] key = new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4"); byte[] keyiv = {1, 2, 3, 4, 5, 6, 7, 8}; Scanner sc = new Scanner(System.in); System.out.println("请输入加密前的字符串:"); String str = sc.nextLine(); System.out.println("原始字符串为: " + str); byte[] data = str.getBytes("UTF-8"); System.out.println("开始CBC加密解密"); byte[] strEncode = des3EncodeCBC(key, keyiv, data); System.out.println("以BASE64编码输出加密后的byte为:" + new BASE64Encoder().encode(strEncode)); for (int i = 0; i < strEncode.length; i++) // 输出加密后的strEncode每字节的内容 { System.out.println("Encode byte[" + i + "] " + strEncode[i]); } byte[] strDecode = des3DecodeCBC(key, keyiv, strEncode); String strGet = new String(strDecode, "UTF-8"); System.out.println("解密后的字符串内容为:" + strGet); for (int i = 0; i < strDecode.length; i++) // 输出解密后strDecode每字节的内容 { System.out.println("Decode byte[" + i + "] " + strDecode[i]); } } 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; } 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; }}运行例子如下图所示:
下面是C#中3DES加密解密的示例代码:
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Security.Cryptography;namespace DES{ class Program { private static byte[] key = Convert.FromBase64String("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4"); private static byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; public static byte[] Des3EncodeCBC(byte[] key, byte[] iv, byte[] data) { try { MemoryStream mStream = new MemoryStream(); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; tdsp.Padding = PaddingMode.PKCS7; CryptoStream cStream = new CryptoStream(mStream, tdsp.CreateEncryptor(key, iv), CryptoStreamMode.Write); cStream.Write(data, 0, data.Length); cStream.FlushFinalBlock(); byte[] ret = mStream.ToArray(); cStream.Close(); mStream.Close(); return ret; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } public static byte[] Des3DecodeCBC(byte[] key, byte[] iv, byte[] data) { try { MemoryStream msDecrypt = new MemoryStream(data); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; tdsp.Padding = PaddingMode.PKCS7; CryptoStream csDecrypt = new CryptoStream(msDecrypt, tdsp.CreateDecryptor(key, iv), CryptoStreamMode.Read); byte[] fromEncrypt = new byte[data.Length]; csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length); return fromEncrypt; } catch(CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } static void Main(string[] args) { System.Text.Encoding utf8 = System.Text.Encoding.UTF8; Console.WriteLine("请输入加密前的字符串:"); string str = Console.ReadLine(); Console.WriteLine("原始字符串为: " + str); byte[] data = utf8.GetBytes(str); System.Console.WriteLine("开始CBC加密解密"); byte[] strEncode = Program.Des3EncodeCBC(key, iv, data); string base64Str = Convert.ToBase64String(strEncode); System.Console.WriteLine("以BASE64编码输出加密后的byte为:" + base64Str); for (int i = 0; i < strEncode.Length; i++) // 输出加密后的strEncode每字节的内容 { Console.WriteLine("Encode : byte[" + i + "] " + strEncode[i]); } byte[] strDecode = Program.Des3DecodeCBC(key, iv, strEncode); string strGet = utf8.GetString(strDecode); Console.WriteLine("解密后的字符串内容为:" + strGet + ",长度为" + strGet.Length); for (int i = 0; i < strDecode.Length; i++) // 输出加密后的strDecode每字节的内容 { Console.WriteLine("Decode byte[" + i + "] " + strDecode[i]); } // 去除生成byte的末尾的一些ASCII码为0的字符 int len = 0; for (int i = 0; i < strDecode.Length; i++) { if (strDecode[i] != 0) len++; } byte[] strDecodeEmit = new byte[len]; for (int i = 0; i < len; i++) { strDecodeEmit[i] = strDecode[i]; } System.Console.WriteLine("去掉末尾0后获得的字符串为:" + utf8.GetString(strDecodeEmit) + ",长度为:" + utf8.GetString(strDecodeEmit).Length); System.Console.ReadLine(); } }}
运行例子如下图所示:
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