RSA.Cryptography “不正确的参数”抛出 C#答案

【问题标题】：RSA.Cryptography "Incorrect Parameter" thrown C#RSA.Cryptography “不正确的参数”抛出 C#
【发布时间】：2020-11-23 06:49:40
【问题描述】：

我正在尝试为我和我的朋友设置一个混乱的服务器，但遇到了 RSA 解密的问题。

使用了正确的键
如果我启用 OAEP 填充，我会收到一条错误消息，仅显示“OAEPpadding”
我对这个错误失去了理智，我在下面发布脚本。
加密工作正常，只是解密有问题

请帮忙

using System;
using System.Net.Sockets;
using System.Net;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.Xml.Serialization;

namespace Server_WIN_
{
class Program
{
 public static XmlSerializer xs = new XmlSerializer(typeof(RSAParameters));
 public static TcpListener server = new TcpListener(IPAddress.Parse("192.168.1.93"), 78);
 public static TcpClient client = null;
 public static NetworkStream canwetalk = null;
 public static RSACryptoServiceProvider csp = new RSACryptoServiceProvider(4096);
 public static RSAParameters publickey;
 public static RSAParameters privatekey;
 static Program()
 {
     server.Start();
     csp.PersistKeyInCsp = false;
     publickey = csp.ExportParameters(false);
     privatekey = csp.ExportParameters(true);

     client = server.AcceptTcpClient();
     canwetalk = client.GetStream();
 }
         public static void Main(string[] args)
 {
         string strHostName = "";
         strHostName = Dns.GetHostName();
         // Then using host name, get the IP address list..
         IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
         IPAddress[] addr = ipEntry.AddressList;
     Random ran = new Random();
     HashAlgorithm sha = SHA256.Create();
     string msg = "";
     byte[] buffer = new byte[4096];
     msg = "test";
     msg = Encrypt(msg);
     msg = Decrypt(msg);
     Console.WriteLine(msg);
 }

 public static string PublicKeyString()
 {
     byte[] bytes = new byte[4096];
     var sw = new StringWriter();
     var xs = new XmlSerializer(typeof(RSAParameters));
     xs.Serialize(sw, publickey);
     return sw.ToString();
 }
 public static string PrivateKeyString()
 {
     byte[] bytes = new byte[4096];
     var sw = new StringWriter();
     var xs = new XmlSerializer(typeof(RSAParameters));
     xs.Serialize(sw, privatekey);
     return sw.ToString();
 }
 public static string Encrypt(string msg)
 {
     csp.ImportParameters(publickey);

     byte[] data = System.Text.Encoding.ASCII.GetBytes(msg);
     byte[] cipher = csp.Encrypt(data, false);
     return System.Text.Encoding.ASCII.GetString(cipher);
 }
 public static string Decrypt(string msg)
 {
     try
     { 
         csp.ImportParameters(privatekey);
         byte[] decrypted = csp.Decrypt(System.Text.Encoding.ASCII.GetBytes(msg), false);
         return System.Text.Encoding.Unicode.GetString(decrypted);
     }
     catch(CryptographicException e)
     {
         string p = e.ToString();
         Console.WriteLine(p);
     }
     return "";
 }
 public static void ExportPublicKey()
 {
     string msg = PublicKeyString();
     byte[] buffer = new byte[4096];
     byte[] msg1 = System.Text.Encoding.ASCII.GetBytes(msg);
     canwetalk.Write(msg1, 0, msg1.Length);

 }
 public static void ToStream(string msg, bool Encryption)
 {
     if (Encryption)
     {
         msg = Encrypt(msg);
         byte[] msgbytes = System.Text.Encoding.ASCII.GetBytes(msg);
         canwetalk.Write(msgbytes, 0, msgbytes.Length);
     }
     else
     {
         byte[] msgbytes = System.Text.Encoding.ASCII.GetBytes(msg);
         canwetalk.Write(msgbytes, 0, msgbytes.Length);
     }
 }
 public static string ReadStream()
 {
     byte[] buffer = new byte[4096];
     int i = canwetalk.Read(buffer,0,buffer.Length);
     return System.Text.Encoding.ASCII.GetString(buffer,0,i);
 }

}

【问题讨论】：

return System.Text.Encoding.ASCII.GetString(cipher); 这永远行不通。加密的结果是一个不代表有效 ASCII 编码字符串的任意字节序列。解码器将简单地用有效的东西替换不可能的编码并继续前进。结果是损坏的数据。字节数组 (byte[]) 没有任何问题，它们可以轻松地在函数之间和通过网络流传递。但是，如果您必须转换为字符串，请使用适当的编码，例如 base64。
谢谢詹姆斯，你说得对，我不知道为什么我试图将它解析为字符串。

标签： c# encryption rsa sos

【解决方案1】：

你会发现这个 stackoverflow 问题很有帮助，但它已经过时了 Error occurred while decoding OAEP padding

【讨论】：

【解决方案2】：

不要使用相同的提供程序。改为这样做：

var publicKey = RSA.Create();

publicKey.ImportParameters(PUB_PARAMS);

var privateKey = RSA.Create();

privateKey.ImportParameters(PRIV_PARAMS);

【讨论】：