关于单点登录插件如何使用C# 进行实现的方法

目前官方只提供了Java的实现方法，这里提供一种C#的实现方法，使用nuget包：Portable.BouncyCastle，安装后使用一下帮助类即可：

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Web;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;

public class RSAHelper
{
    public static string publicKey = @"替换成你自己的PUBLIC KEY";
    public static string RsaEncrypt(string value, bool usePkcs8 = false)
    {
        if (string.IsNullOrEmpty(value)) return value;

        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(2048);
        rsa.FromXmlString(RSAPublicKeyJava2DotNet(publicKey));//将公钥导入到RSA对象中，准备加密；
        var buffer = Encoding.UTF8.GetBytes(value);
        buffer = rsa.Encrypt(buffer, false);
        return Convert.ToBase64String(buffer);
    }

    /***************以下是java提供的公私钥转成.net公私钥XML的方式*************************************/
    /// <summary> 
    /// RSA公钥格式转换，java->.net
    /// </summary>
    /// <param name="publicKey">java生成的公钥</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()));
    }

}