C#RSA對(duì)接JAVA中RSA方式的示例分析

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C#中通過FromXmlString屬性加載的是XML形式,而JAVA中用到的是解析后的PEM格式的字符串,總之讀取證書中信息無(wú)非是轉(zhuǎn)換方式問題

/// <summary>
    /// c# 使用 java 的公鑰進(jìn)行rsa加密 utf8編碼  通過解析公鑰加密數(shù)據(jù)
    /// </summary>
    /// <param name="publickey"></param>
    /// <returns></returns>
    public static string RSAEncrypts(string content)
    {

      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      byte[] cipherbytes;
      X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\Config\\dsptest.cer");
      //創(chuàng)建并返回當(dāng)前算法對(duì)象的xml字符串表示形式
      string publicKeyString = x509Certificate2.PublicKey.Key.ToXmlString(false);
      rsa.FromXmlString(publicKeyString);
      //rsa.FromXmlString(RSAPublicKeyJava2DotNet(publicKeyString));
      cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
      return Convert.ToBase64String(cipherbytes);  
    }

      /// <summary>
      /// 私鑰解密 通過解析私鑰來(lái)解析數(shù)據(jù) X509KeyStorageFlags.Exportable這個(gè)屬性很關(guān)鍵是獲取私鑰信息的
      /// </summary>
      /// <param name="privatekey"></param>
      /// <param name="content"></param>
      /// <returns></returns>
     public static string RSADecrypt( string content)
    {
      byte[] rgb = Convert.FromBase64String(content);
      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
      byte[] cipherbytes;
      X509Certificate2 x509Certificate2 = new X509Certificate2("D:\\Config\\test.pfx", "cfca1234", X509KeyStorageFlags.Exportable);
      //創(chuàng)建并返回當(dāng)前算法對(duì)象的xml字符串表示形式
      //rsa.FromXmlString(RSAPrivateKeyJava2DotNet(Const.privatekey));

      rsa.FromXmlString(x509Certificate2.PrivateKey.ToXmlString(true));
      cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);
      return Encoding.UTF8.GetString(cipherbytes);      
    }

/***************以下是java提供的公私鑰轉(zhuǎn)成.net公私鑰XML的方式*************************************/
/// <summary> 
/// RSA公鑰格式轉(zhuǎn)換，java->.net
/// </summary>
/// <param name="publicKey">java生成的公鑰</param>
/// <returns></returns>
public static string RSAPublicKeyJava2DotNet(string publicKey)
{
RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
}

/// <summary>
/// RSA私鑰格式轉(zhuǎn)換，java->.net
/// </summary>
/// <param name="privateKey">java生成的RSA私鑰</param>
/// <returns></returns>
public static string RSAPrivateKeyJava2DotNet(string privateKey)
{
 RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));

return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));

}

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