C#与JAVA平台RSA算法交互示例

很久以前的文章中，演示了如何对于.net和win32下面的delphi的RSA互操作性的实现，对于C#和JAVA之前的RSA加密解密也是很简单的，一般都采用了标准的规范，所以在互操作性方面是很方便的。之前也有博友私信请教这方面的问题，现在放出一个demo实现：

一、概述

算法：RSA/ECB/PKCS1Padding

RSA KEY：为了便于演示，使用http://www.cnblogs.com/midea0978/articles/768824.html中的Key

代码:C# & JAVA

二、JAVA平台

 1 import org.junit.Test;
 2 import sun.misc.BASE64Decoder;
 3 import sun.misc.BASE64Encoder;
 4 
 5 import javax.crypto.Cipher;
 6 import java.io.IOException;
 7 import java.math.BigInteger;
 8 import java.security.KeyFactory;
 9 import java.security.PrivateKey;
10 import java.security.PublicKey;
11 import java.security.spec.RSAPrivateKeySpec;
12 import java.security.spec.RSAPublicKeySpec;
13 
14 /**
15  * 基于.net的PKCS1Padding加密信息的JAVA解密交互操作
16  * 参考：http://www.cnblogs.com/midea0978/articles/768824.html
17  * User: midea0978
18  * Date: 11-12-10 上午10:51
19  */
20 public class RSATest {
21     String e = "65537";
22     String n = "123410773237385713572440712840019405878257600213906351775134402766524785605776353635515879438375969303333340691224323217379791619946464100287854264933660919378485000299257054039555887477610831829409144592603086784397675690934246422666689022312589317493002336070775714030955737435316659994026756956753416169929";
23     String d = "102299672961750099570264341757280532275542401837445663770632643616494888426681205847125069294737520917541038900032845310395266178574112466427178094767628391398378924953787043659322148498169017989730953803803890989295625028193153480552247210183981959942844345362118479513739632952091865360095551345350474614233";
24 
25     @Test
26     public void testDecrypt() {
27         BigInteger bn = new BigInteger(n);
28         BigInteger be = new BigInteger(e);
29         BigInteger bd = new BigInteger(d);
30         RSAPublicKeySpec pub = new RSAPublicKeySpec(bn, be);
31         RSAPrivateKeySpec prv = new RSAPrivateKeySpec(bn, bd);
32         try {
33             KeyFactory kf = KeyFactory.getInstance("RSA");
34             PublicKey pubkey = kf.generatePublic(pub);
35             PrivateKey prvkey = kf.generatePrivate(prv);
36             Cipher rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding");
37             //加密
38             rsa.init(Cipher.ENCRYPT_MODE, pubkey);
39             String txt = "Welcome,RSA!from 博客园";
40             byte[] encdata = rsa.doFinal(txt.getBytes());
41             System.out.printf("RSA加密：
明文:%s
密文：%s
", txt, convertToBase64(encdata));
42             //解密
43             rsa.init(Cipher.DECRYPT_MODE, prvkey);
44             rsa.update(encdata);
45             byte[] res = rsa.doFinal();
46             System.out.printf("解密:%s", new String(res));
47         } catch (Exception e1) {
48             e1.printStackTrace();
49         }
50     }
51 
52     public byte[] convertFromBase64(String s) throws IOException {
53         s = s.replaceAll("\\n", "
");
54         BASE64Decoder decoder = new BASE64Decoder();
55         return decoder.decodeBuffer(s);
56     }
57 
58     public String convertToBase64(byte[] data) {
59         BASE64Encoder encoder = new BASE64Encoder();
60         return encoder.encode(data);
61     }
62 
63 
64 }

运行结果：

RSA加密：
明文:Welcome,RSA!from 博客园
密文：E3F+Qwyk8MJkHv7zEOb4Fdg0CX4pQOKghyOmMew8jPDUbxNJhDSlV/aS5nnVuiEtkWU1BmCrPSEi
swhuEjC7eRJnq5pEkyf0GILHFNkuoqD1o4FjKnl/oTXg83wn5JDgi5Bog5lJM8YcQcExEMsH9IF+
gbeq6rWYrbb4Qj2oM8c=
解密:Welcome,RSA!from 博客园

 三：C#解密

将上面JAVA加密的信息加入到程序中解密：

 1 using System.Text.RegularExpressions;
 2 using System.Text;
 3 using System.IO;
 4 using System.Net;
 5 using System.Xml;
 6 using System.Runtime.InteropServices;
 7 using System;
 8 using System.Security;
 9 using System.Security.Cryptography;
10 public class RSATestForJava
11 {
12     private String p,q,e,n,d,dp,dq,crt;
13     private RSAParameters param;
14     public void Init(){
15         p="12794390226544301614076650435602993036558056678553112540698297249963365434628505393116653422818365344228379828231764392521731584684435248093787027949139091";
16         q="9645694015283940797244851561543569992525098416055322825220116046655435860727361740896753161534492415500799272063647633894112205918420307541634544631799219";
17         e="65537";
18         n="123410773237385713572440712840019405878257600213906351775134402766524785605776353635515879438375969303333340691224323217379791619946464100287854264933660919378485000299257054039555887477610831829409144592603086784397675690934246422666689022312589317493002336070775714030955737435316659994026756956753416169929";
19         d="102299672961750099570264341757280532275542401837445663770632643616494888426681205847125069294737520917541038900032845310395266178574112466427178094767628391398378924953787043659322148498169017989730953803803890989295625028193153480552247210183981959942844345362118479513739632952091865360095551345350474614233";
20         dp="1529969882744521289493243655703200580244831014386083326692594344385048063096931454992679141166478923397741927672190328275520857365639547725880173612423563";
21         dq="769453717928871362558494956494038236735297839680443531596667023084892788499361386413907037681040120057954721673997128797449053397950796768659923391901465";
22         crt="12583540851660819630796910273258143748946857763306703439274571717196507402536398234616014735603915981141807543055250658251670340810611251684169356826070785";
23 
24         param=new RSAParameters();
25         byte[] bdata=GetBytes(e);
26         param.Exponent=bdata;
27         param.P=GetBytes(p);
28         param.Q=GetBytes(q);
29         param.Modulus=GetBytes(n);
30         param.D=GetBytes(d);
31         param.DP=GetBytes(dp);
32         param.DQ=GetBytes(dq);
33         param.InverseQ=GetBytes(crt);
34     }
35     public void DoTest(){
36         RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
37         rsa.ImportParameters(param);
38         String edata="E3F+Qwyk8MJkHv7zEOb4Fdg0CX4pQOKghyOmMew8jPDUbxNJhDSlV/aS5nnVuiEtkWU1BmCrPSEi";
39         edata+="swhuEjC7eRJnq5pEkyf0GILHFNkuoqD1o4FjKnl/oTXg83wn5JDgi5Bog5lJM8YcQcExEMsH9IF+";
40         edata+="gbeq6rWYrbb4Qj2oM8c=";
41         //解密JAVA加密的数据
42         Byte[] encdata=Convert.FromBase64String(edata);
43         byte[] dedata=rsa.Decrypt(encdata,false);
44         Console.WriteLine("
解密JAVA加密的数据:"+Encoding.Default.GetString(dedata));
45     }
46     public static void Main(String[] args)
47     {
48         RSATestForJava obj=new RSATestForJava();
49         obj.Init();
50         obj.DoTest();
51     }
52     public static byte[] GetBytes(String num){
53         BigInteger n=new BigInteger(num,10);
54         String s=n.ToString(2);
55         if(s.Length%8>0){
56             s=new String('0',8-s.Length%8)+s;
57         }
58         byte[] data=new byte[s.Length/8];
59         String ocetstr;
60         for(int i=0;i<data.Length;i++){
61             ocetstr=s.Substring(8*i,8);
62             data[i]=Convert.ToByte(ocetstr , 2 ) ;
63         }
64         return data;
65     }
66 
67     public String ConvByteArrayToHex(byte[] data){
68         String s="";
69         for(int i=0;i<data.Length;i++){
70             s+=Convert.ToString(data[i],16);
71         }
72         return s.ToUpper();
73     }
74 
75 
76 }

编译运行结果：

D:allproject sa.net>csc RSATestForJava.cs BigInteger.cs
Microsoft (R) Visual C# 2005 Compiler version 8.00.50727.3053
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50727
Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.

D:allproject sa.net>RSATestForJava

解密JAVA加密的数据:Welcome,RSA!from 博客园

D:allproject sa.net>

C#代码下载：RSAtestForJava.rar

达成交互效果！