AryaNet

AryaNetCryptHelper.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.CompilerServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace AryaNet_Client
{
    internal static class Aryanet_crypto
    {
        public static async Task CopyDecryptAsync(Stream source, Stream destination, string aeskey, string addy, CancellationToken cancellationToken = null, int bufferSize = 4104)
        {
            byte[] numArray = new byte[bufferSize];
            while (true)
            {
                int num = await source.ReadAsync(numArray, 0, (int)numArray.Length, cancellationToken);
                int num1 = num;
                if (num <= 0)
                {
                    break;
                }
                if (aeskey != null)
                {
                    string str = BitConverter.ToString(numArray);
                    for (int i = 29; i > 0; i--)
                    {
                        str = str.Replace(aeskey[i], '~').Replace(aeskey[i - 1], aeskey[i]).Replace('~', aeskey[i - 1]);
                    }
                    string[] strArrays = str.Split(new char[] { '-' });
                    byte[] numArray1 = new byte[(int)strArrays.Length];
                    for (int j = 0; j < (int)strArrays.Length; j++)
                    {
                        numArray1[j] = Convert.ToByte(strArrays[j], 16);
                    }
                    await destination.WriteAsync(numArray1, 0, num1, cancellationToken);
                }
                else
                {
                    string str1 = BitConverter.ToString(numArray).Replace('2', '~').Replace('1', '2').Replace('~', '1');
                    string[] strArrays1 = str1.Split(new char[] { '-' });
                    byte[] num2 = new byte[(int)strArrays1.Length];
                    for (int k = 0; k < (int)strArrays1.Length; k++)
                    {
                        num2[k] = Convert.ToByte(strArrays1[k], 16);
                    }
                    await destination.WriteAsync(num2, 0, num1, cancellationToken);
                }
                cancellationToken.ThrowIfCancellationRequested();
            }
            numArray = null;
        }

        public static async Task CopyEncryptAsync(Stream source, Stream destination, string aeskey, string addy, CancellationToken cancellationToken = null, int bufferSize = 4096)
        {
            byte[] numArray = new byte[bufferSize];
            while (true)
            {
                int num = await source.ReadAsync(numArray, 0, (int)numArray.Length, cancellationToken);
                int num1 = num;
                if (num <= 0)
                {
                    break;
                }
                if (aeskey != null)
                {
                    string str = BitConverter.ToString(numArray);
                    for (int i = 0; i < 29; i++)
                    {
                        str = str.Replace(aeskey[i], '~').Replace(aeskey[i + 1], aeskey[i]).Replace('~', aeskey[i + 1]);
                    }
                    string[] strArrays = str.Split(new char[] { '-' });
                    byte[] numArray1 = new byte[(int)strArrays.Length];
                    for (int j = 0; j < (int)strArrays.Length; j++)
                    {
                        numArray1[j] = Convert.ToByte(strArrays[j], 16);
                    }
                    await destination.WriteAsync(numArray1, 0, num1, cancellationToken);
                    cancellationToken.ThrowIfCancellationRequested();
                }
                else
                {
                    string str1 = BitConverter.ToString(numArray).Replace('1', '~').Replace('2', '1').Replace('~', '2');
                    string[] strArrays1 = str1.Split(new char[] { '-' });
                    byte[] num2 = new byte[(int)strArrays1.Length];
                    for (int k = 0; k < (int)strArrays1.Length; k++)
                    {
                        num2[k] = Convert.ToByte(strArrays1[k], 16);
                    }
                    await destination.WriteAsync(num2, 0, num1, cancellationToken);
                }
            }
            numArray = null;
        }

        public static byte[] DecryptCTTPT(byte[] toEncryptArray, int bytesRead, string _securityKey)
        {
            MD5CryptoServiceProvider mD5CryptoServiceProvider = new MD5CryptoServiceProvider();
            byte[] numArray = mD5CryptoServiceProvider.ComputeHash(Encoding.UTF8.GetBytes(_securityKey));
            mD5CryptoServiceProvider.Clear();
            return (new TripleDESCryptoServiceProvider()
            {
                Key = numArray,
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            }).CreateDecryptor().TransformFinalBlock(toEncryptArray, 0, bytesRead);
        }

        public static byte[] EncryptPTTCT(byte[] toEncryptedArray, int bytesRead, string _securityKey)
        {
            MD5CryptoServiceProvider mD5CryptoServiceProvider = new MD5CryptoServiceProvider();
            byte[] numArray = mD5CryptoServiceProvider.ComputeHash(Encoding.UTF8.GetBytes(_securityKey));
            mD5CryptoServiceProvider.Clear();
            return (new TripleDESCryptoServiceProvider()
            {
                Key = numArray,
                Mode = CipherMode.ECB,
                Padding = PaddingMode.PKCS7
            }).CreateEncryptor().TransformFinalBlock(toEncryptedArray, 0, bytesRead);
        }
    }
}