小编use*_*316的帖子

我有以下代码来加密和解密c#中的消息.当我试图运行它时给出一个例外,即"要解密的数据超过此模数为256字节的最大值"

 public static void Main(string[] args)
    {
        X509Certificate2 cert = new X509Certificate2(@"C:\Data\ABC-rsa-public-key-certificate.cer");
        string encryptedText = EncrypIt("Hello", cert);
        string decryptedText = DecrptIt(encryptedText, cert);
        System.Console.WriteLine(decryptedText);


    }

    public static string EncrypIt(string inputString, X509Certificate2 cert)
    {
        RSACryptoServiceProvider publicKey = (RSACryptoServiceProvider)cert.PublicKey.Key;
        byte[] plainBytes = Encoding.UTF8.GetBytes(inputString);
        byte[] encryptedBytes = publicKey.Encrypt(plainBytes, false);
        string encryptedText = Encoding.UTF8.GetString(encryptedBytes);
        return encryptedText;      
    }

    public static string DecrptIt(string encryptedText, X509Certificate2 cert)
   {
       RSACryptoServiceProvider privateKey = (RSACryptoServiceProvider)cert.PublicKey.Key;
       byte[] encryptedBytes = Encoding.UTF8.GetBytes(encryptedText);
       byte[] decryptedBytes = privateKey.Decrypt(encryptedBytes, false);
       string decryptedText = Encoding.UTF8.GetString(decryptedBytes);
       return decryptedText;
   }