using System;

using System.Linq;

using System.Text;

using System.Security.Cryptography;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        var text = "abc123";

        var key = "RCn6SMt(aCakKFTpy0Q]K4GT}A{]x^Xg";

        var iv = "CkJTkwKnKu{=@5b8";

        var encrypted1 = AESEncrypt(text, key, iv);

        var encrypted2 = AesEncrypt(text, key, iv);

        Console.WriteLine(encrypted1);

        Console.WriteLine(encrypted2);

    }

    public static string AESEncrypt(string plainText, string key, string iv)

        {

            byte[] encrypted;

            // Create a new AesManaged.    

            using (AesManaged aes = new())

            {

                aes.IV = Encoding.UTF8.GetBytes(iv);

                aes.Key = Encoding.UTF8.GetBytes(key);

                // Create encryptor    

                ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

                // Create MemoryStream    

                using (MemoryStream ms = new())

                {

                    // Create crypto stream using the CryptoStream class. This class is the key to encryption    

                    // and encrypts and decrypts data from any given stream. In this case, we will pass a memory stream    

                    // to encrypt    

                    using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))

                    {

                        // Create StreamWriter and write data to a stream    

                        using (StreamWriter sw = new StreamWriter(cs))

                            sw.Write(plainText);

                        encrypted = ms.ToArray();

                    }

                }

            }

            // Return encrypted data    

            return encrypted.ToHexString();

        }

    public static string AesEncrypt(string plainText, string key, string iv)

        {

            byte[] encrypted;

​

            var aes = Aes.Create();

​

            aes.IV = Encoding.UTF8.GetBytes(iv);

            aes.Key = Encoding.UTF8.GetBytes(key);

            // Create encryptor    

            ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

            // Create MemoryStream    

            using (MemoryStream ms = new())

            {

                // Create crypto stream using the CryptoStream class. This class is the key to encryption    

                // and encrypts and decrypts data from any given stream. In this case, we will pass a memory stream    

                // to encrypt    

                using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))

                {

                    // Create StreamWriter and write data to a stream    

                    using (StreamWriter sw = new StreamWriter(cs))

                        sw.Write(plainText);

                    encrypted = ms.ToArray();

                }

            }

​

            // Return encrypted data    

            return encrypted.ToHexString();

        }

}

​

public static class Extension{

    public static string ToHexString(this byte[] value) => string.Join("", value.Select(k => k.ToString("x2")));

}