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C# RSA和Java RSA互通

編輯：C#入門知識

今天調查了C# RSA和Java RSA，網上很多人說，C#加密或者java加密，Java不能解密或者C#不能解密

但是我嘗試了一下，發現是可以的，下面就是我嘗試的代碼，如果您有什麼問題，我想看看，他們為什麼不能互通？

Rsamain代碼

package rsa;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.Cipher;
import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException;
import com.sun.org.apache.xml.internal.security.utils.Base64;
/**
* @author cnchenhl
* Jul 8, 2011
*/
public class RSAMain {
private static String module = "5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=";
private static String exponentString = "AQAB";
private static String delement = "vmaYHEbPAgOJvaEXQl+t8DQKFT1fudEysTy31LTyXjGu6XiltXXHUuZaa2IPyHgBz0Nd7znwsW/S44iql0Fen1kzKioEL3svANui63O3o5xdDeExVM6zOf1wUUh/oldovPweChyoAdMtUzgvCbJk1sYDJf++Nr0FeNW1RB1XG30=";
private static String encryptString = "Vx/dGjS1YWKRubsoDgiShiwLgqyNE2z/eM65U7HZx+RogwaiZimNBxjuOS6acEhKZx66cMYEAd1fc6oewbEvDIfP44GaN9dCjKE/BkkQlwEg6aTO5q+yqy+nEGe1kvLY9EyXS/Kv1LDh3e/2xAk5FNj8Zp6oU2kq4ewL8kK/ai4=";
/**
* @param args
*/
public static void main(String[] args) {
byte[] en = encrypt();
System.out.println(Base64.encode(en));
byte[] enTest = null;
try {
enTest = Base64.decode(encryptString);
} catch (Base64DecodingException e) {
e.printStackTrace();
}
System.out.println(enTest.length);
System.out.println(en.length);
System.out.println(new String(Dencrypt(en)));
System.out.println(new String(Dencrypt(enTest)));
}
public static byte[] encrypt() {
try {
byte[] modulusBytes = Base64.decode(module);
byte[] exponentBytes = Base64.decode(exponentString);
BigInteger modulus = new BigInteger(1, modulusBytes);
BigInteger exponent = new BigInteger(1, exponentBytes);
RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
KeyFactory fact = KeyFactory.getInstance("RSA");
PublicKey pubKey = fact.generatePublic(rsaPubKey);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] cipherData = cipher.doFinal(new String("chenhailong").getBytes());
return cipherData;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static byte[] Dencrypt(byte[] encrypted) {
try {
byte[] expBytes = Base64.decode(delement);
byte[] modBytes = Base64.decode(module);
BigInteger modules = new BigInteger(1, modBytes);
BigInteger exponent = new BigInteger(1, expBytes);
KeyFactory factory = KeyFactory.getInstance("RSA");
Cipher cipher = Cipher.getInstance("RSA");
RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, exponent);
PrivateKey privKey = factory.generatePrivate(privSpec);
cipher.init(Cipher.DECRYPT_MODE, privKey);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

C#代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace RSA
{
class Program
{
static void Main(string[] args)
{
string de = "iBILuPJFgPMxgpbgN3F2JjD6XjcqRSApjVVbvBBEBDV21Pjj7lTrfhEjSVnJX/MVoZrmX0lxsvoXTMvvVwVF7K7W5hs7Qo+aMN96yWke7wiLEM9M4pPz60A/KSckskiona67tXcqOLXb8N18TKaNCKHv0Ce+GyEKK5+MT7e1vao=";
//string encrypt = RSAEncrypt("", "chenhailong");
byte[] encrypt = RSAEncrypt("chenhailong");
//string name = RSADecrypt(encrypt);
string name = RSADecrypt(Convert.FromBase64String(de));
Console.WriteLine(encrypt.Length);
Console.WriteLine(Convert.ToBase64String(encrypt));
Console.WriteLine(name);
Console.ReadKey();
}
/// <summary>
/// RSA encrypt
/// </summary>
/// <param name="publickey"></param>
/// <param name="content"></param>
/// <returns></returns>
public static byte[] RSAEncrypt(string content)
{
string publickey = @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
byte[] cipherbytes;
rsa.FromXmlString(publickey);
cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
//return Convert.ToBase64String(cipherbytes);
return cipherbytes;
}
/// <summary>
/// RSA decrypt
/// </summary>
/// <param name="privatekey"></param>
/// <param name="content"></param>
/// <returns></returns>
public static string RSADecrypt(byte[] content)
{
string privatekey = @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent><P>/hf2dnK7rNfl3lbqghWcpFdu778hUpIEBixCDL5WiBtpkZdpSw90aERmHJYaW2RGvGRi6zSftLh00KHsPcNUMw==</P><Q>6Cn/jOLrPapDTEp1Fkq+uz++1Do0eeX7HYqi9rY29CqShzCeI7LEYOoSwYuAJ3xA/DuCdQENPSoJ9KFbO4Wsow==</Q><DP>ga1rHIJro8e/yhxjrKYo/nqc5ICQGhrpMNlPkD9n3CjZVPOISkWF7FzUHEzDANeJfkZhcZa21z24aG3rKo5Qnw==</DP><DQ>MNGsCB8rYlMsRZ2ek2pyQwO7h/sZT8y5ilO9wu08Dwnot/7UMiOEQfDWstY3w5XQQHnvC9WFyCfP4h4QBissyw==</DQ><InverseQ>EG02S7SADhH1EVT9DD0Z62Y0uY7gIYvxX/uq+IzKSCwB8M2G7Qv9xgZQaQlLpCaeKbux3Y59hHM+KpamGL19Kg==</InverseQ><D>vmaYHEbPAgOJvaEXQl+t8DQKFT1fudEysTy31LTyXjGu6XiltXXHUuZaa2IPyHgBz0Nd7znwsW/S44iql0Fen1kzKioEL3svANui63O3o5xdDeExVM6zOf1wUUh/oldovPweChyoAdMtUzgvCbJk1sYDJf++Nr0FeNW1RB1XG30=</D></RSAKeyValue>";
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
byte[] cipherbytes;
rsa.FromXmlString(privatekey);
cipherbytes = rsa.Decrypt(content, false);
return Encoding.UTF8.GetString(cipherbytes);
}
}
}