using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

namespace CascCrypto

{

    // Token: 0x02000007 RID: 7

    public class Crypto

    {

        // Token: 0x06000012 RID: 18 RVA: 0x00002290 File Offset: 0x00000690

        public static string EncryptString(string Plaintext, string Key)

        {

            byte[] bytes = Encoding.UTF8.GetBytes(Plaintext);

            Aes aes = Aes.Create();

            aes.BlockSize = 128;

            aes.KeySize = 128;

            aes.IV = Encoding.UTF8.GetBytes("1tdyjCbY1Ix49842");

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

            aes.Mode = CipherMode.CBC;

            string result;

            using (MemoryStream memoryStream = new MemoryStream())

            {

                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write))

                {

                    cryptoStream.Write(bytes, 0, bytes.Length);

                    cryptoStream.FlushFinalBlock();

                }

                result = Convert.ToBase64String(memoryStream.ToArray());

            }

            return result;

        }

​

        // Token: 0x06000013 RID: 19 RVA: 0x00002360 File Offset: 0x00000760

        public static string DecryptString(string EncryptedString, string Key)

        {

            byte[] array = Convert.FromBase64String(EncryptedString);

            Aes aes = Aes.Create();

            aes.KeySize = 128;

            aes.BlockSize = 128;

            aes.IV = Encoding.UTF8.GetBytes("1tdyjCbY1Ix49842");

            aes.Mode = CipherMode.CBC;

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

            string @string;

            using (MemoryStream memoryStream = new MemoryStream(array))

            {

                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Read))

                {

                    byte[] array2 = new byte[checked(array.Length - 1 + 1)];

                    cryptoStream.Read(array2, 0, array2.Length);

                    @string = Encoding.UTF8.GetString(array2);

                }

            }

            return @string;

        }

​

        // Token: 0x04000006 RID: 6

        public const string DefaultIV = "1tdyjCbY1Ix49842";

​

        // Token: 0x04000007 RID: 7

        public const int Keysize = 128;

        public static void Main(string[] args)

        {

            string pewude = "sT333ve2";

            string encKey = "c4scadek3y654321";

            string enc = EncryptString(pewude, encKey);

            Console.WriteLine("You got grade A and your percentage marks is " + enc );

        }

    }

​

}

​