为什么我的加密/解密程序不起作用？

Question

我正在学习算法，我编写了一个带有Rijndae加密的控制台项目，具有给定的IV和Key。

由于它不会对给定的字符串进行任何更改，因此它实际上不起作用，无论您输入什么，它都会输出相同的字符串。

有人可以告诉我或引导我走出低谷吗？我真的不知道我在哪里做错

提前谢谢

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace RijndaelManage
{


    class Rijndael
    {


        public static void Main()
        {

            try
            {


                string original = "input data here";
                using (RijndaelManaged myRijndael = new RijndaelManaged())
                {


                    byte[] encrypted = EncryptStringToBytes(original);
                    string aftdecryp = DecryptStringFromBytes(encrypted);

                    Console.WriteLine("Original:   {0}", original);
                    Console.WriteLine("After Decryption: {0}", aftdecryp);

                }

            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}", e.Message);
            }
        }

        public static byte[] EncryptStringToBytes(string plainText)

        {
            byte[] encrypted;
            if (plainText == null)
            {
                goto TR_0000;
            }
            else if (plainText.Length > 0)
            {
                using (RijndaelManaged rijAlg = new RijndaelManaged())
                {
                    string s = "NigeroTomoyo!@#$";
                    string str2 = "8321947192739743";
                    rijAlg.KeySize = 0x80;
                    rijAlg.Mode = CipherMode.CBC;
                    rijAlg.Key = Encoding.UTF8.GetBytes(s);
                    rijAlg.IV = Encoding.UTF8.GetBytes(str2);
                    ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
                    using (MemoryStream msEncrypt = new MemoryStream())
                    {
                        using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                        {
                            using (StreamWriter writer = new StreamWriter(csEncrypt))
                            {
                                writer.Write(plainText);
                            }
                            encrypted = msEncrypt.ToArray();
                        }
                    }
                }
            }
            else
            {
                goto TR_0000;
            }
            return encrypted;
        TR_0000:
            throw new ArgumentNullException("plainText");
        }



         static string DecryptStringFromBytes(byte[] cipherText)
        {

            string plaintext;
            if (cipherText == null)
            {
                goto TR_0000;
            }
            else if (cipherText.Length > 0)
            {
                plaintext = null;
                using (RijndaelManaged rijAlg = new RijndaelManaged())
                {
                    string s = "NigeroTomoyo!@#$";
                    string str3 = "8321947192739743";
                    rijAlg.KeySize = 0x80;
                    rijAlg.Mode = CipherMode.CBC;
                    rijAlg.Key = Encoding.UTF8.GetBytes(s);
                    rijAlg.IV = Encoding.UTF8.GetBytes(str3);
                    ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
                    using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                    {
                        using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                        {
                            using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                            {
                                plaintext = srDecrypt.ReadToEnd();
                            }
                        }
                    }
                }
            }
            else
            {
                goto TR_0000;
            }
            return plaintext;
        TR_0000:
            throw new ArgumentNullException("cipherText");
        }

    }
}