C# RSA加密和解密，RSA生成私钥和公钥（使用XML格式秘钥）

//方案1：RSA公钥加密
var data = RsaHelper.Encrypt("www.cscode.net|C/S框架网", publickey1);
Console.WriteLine(data);

//方案1：RSA私钥解密
var value = RsaHelper.Decrypt(data, privatekey1);
Console.WriteLine(value);

 //方案2：RSA私钥加密
 var data1 = RsaHelper.Encrypt("www.cscode.net|C/S框架网", privatekey1);

 //方案2：RSA私钥解密
 var value1 = RsaHelper.Decrypt(data, privatekey1);

//数字签名、验签
var signData = RsaHelper.Sign("www.cscode.net|C/S框架网", publickey1);
var isEqual = RsaHelper.VerifySign("www.cscode.net|C/S框架网", signData, privatekey1);
Console.WriteLine(isEqual);

  /// <summary>
  /// RSA算法加密解密（使用XML格式秘钥）
  /// </summary>
  public static class RsaHelper
  {
      /// <summary>
      /// 获取RSA 密钥    
      /// </summary>
      /// <param name="privatekey">私钥</param>
      /// <param name="publickey">公钥</param>
      public static void GetXmlKey(out string privatekey, out string publickey)
      {
          RSACryptoServiceProvider provider = new RSACryptoServiceProvider();
          privatekey = provider.ToXmlString(true);
          publickey = provider.ToXmlString(false);
      }

      /// <summary>
      /// RSA 使用公钥加密
      /// </summary>
      /// <param name="plainText">明文</param>
      /// <param name="publicKey">公钥</param>
      /// <returns></returns>
      public static string Encrypt(string plainText, string publicKey)
      {
          byte[] buffer = Encoding.UTF8.GetBytes(plainText);
          RSACryptoServiceProvider provider = new RSACryptoServiceProvider();
          provider.FromXmlString(publicKey);
          byte[] output = provider.Encrypt(buffer, false);
          return Convert.ToBase64String(output);
      }

      /// <summary>
      ///  RSA 使用私钥解密
      /// </summary>
      /// <param name="encryptedText">明文</param>
      /// <param name="privateKey">私钥</param>
      /// <returns></returns>
      public static string Decrypt(string encryptedText, string privateKey)
      {
          byte[] buffer = Convert.FromBase64String(encryptedText);
          RSACryptoServiceProvider provider = new RSACryptoServiceProvider();
          provider.FromXmlString(privateKey);
          byte[] output = provider.Decrypt(buffer, false);
          return Encoding.UTF8.GetString(output);
      }

      /// <summary>
      /// 使用公钥数字签名
      /// </summary>
      /// <param name="data">加密的数据</param>
      /// <param name="publicKey">公钥</param>
      /// <returns></returns>
      public static string Sign(string data, string publicKey)
      {
          return Encrypt(data, publicKey);
      }

      /// <summary>
      /// 使用私钥验签
      /// </summary>
      /// <param name="original">原文</param>
      /// <param name="encryptedText">数字签名的数据</param>
      /// <param name="privateKey">私钥</param>
      /// <returns></returns>
      public static bool VerifySign(string original, string encryptedText, string privateKey)
      {
          return Decrypt(encryptedText, privateKey).CompareTo(original) == 0;
      }

  }