c# 使用BouncyCastle.Crypto实现MD5withRSA以及SHA256withRSA进行加解密

原创已于 2024-04-08 18:29:48 修改 · 1.1k 阅读

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#c# #python #开发语言

于 2024-04-07 15:59:24 首次发布

本文详细介绍了如何在C#中利用BouncyCastle库实现MD5withRSA和SHA256withRSA的私钥签名与公钥验证，包括私钥转换和调用方法示例。

c# 使用BouncyCastle.Crypto实现MD5withRSA以及SHA256withRSA进行加解密，加密key使用的是Pkcs8，java使用的是Pkcs8，具体代码如下：

   /// <summary>
   /// 私钥签名
   /// </summary>
   /// <param name="signStr"></param>
   /// <returns></returns>
   public  static string RSAPrivateSign(string signStr, string privateKey,string encoding="UTF-8", string signerSymbol="md5")
   {
       RSACryptoServiceProvider ras = new RSACryptoServiceProvider();
       ras.FromXmlString(RSAPrivateKeyJava2DotNet(privateKey));
       byte[] signBytes = ras.SignData(Encoding.GetEncoding(encoding).GetBytes(signStr), signerSymbol);
       return Convert.ToBase64String(signBytes);
   }

    /// <summary>
    /// 公钥解密
    /// </summary>
    /// <param name="signStr"></param>
    /// <param name="publicKey"></param>
    /// <returns></returns>
    public static bool VerifyRSASign(string signStr, string publicKey,string verifySign,string encoding= "UTF-8", string signerSymbol = "md5")
    {
        RSACryptoServiceProvider ras = new RSACryptoServiceProvider();
        ras.FromXmlString(RSAPublicKeyJava2DotNet(publicKey));
        return ras.VerifyData(Encoding.GetEncoding(encoding).GetBytes(signStr), signerSymbol, Convert.FromBase64String(verifySign));
    }

  /// <summary>
  /// 转换私钥
  /// </summary>
  /// <param name="privateKey"></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())
      );
  }

调用方式：

            var md5withRSA= RSAPayHelper.RSAPrivateSign(str, javaPrivateKey, "GBK", "MD5");
            var sha256WithRSA= RSAPayHelper.RSAPrivateSign(str, javaPrivateKey, "GBK", "SHA256");