Winify – Rev 44

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///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3      //
//  Please see: http://www.gnu.org/licenses/gpl.html for legal details,  //
//  rights of fair usage, the disclaimer and warranty conditions.        //
///////////////////////////////////////////////////////////////////////////

using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Threading.Tasks;

namespace Winify.Utilities
{
    public static class AES
    {
        #region Static Fields and Constants

        private const int AESKeySaltBytes = 16;

        private static readonly RNGCryptoServiceProvider Rng = new RNGCryptoServiceProvider();

        #endregion

        #region Public Methods

        ///////////////////////////////////////////////////////////////////////////
        //  Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3      //
        ///////////////////////////////////////////////////////////////////////////
        public static async Task<byte[]> Encrypt(byte[] plain, string password)
        {
            using (var rijndael = Rijndael.Create())
            {
                rijndael.BlockSize = 128;
                rijndael.Mode = CipherMode.CBC;
                rijndael.KeySize = 256;
                rijndael.Padding = PaddingMode.PKCS7;
                var salt = new byte[AESKeySaltBytes];
                Rng.GetBytes(salt);
                using (var pdb = new Rfc2898DeriveBytes(password, salt, 1000))
                {
                    rijndael.Key = pdb.GetBytes(rijndael.KeySize / 8);
                    rijndael.IV = pdb.GetBytes(rijndael.BlockSize / 8);

                    using (var memoryStream = new MemoryStream())
                    {
                        using (var cryptoStream =
                               new CryptoStream(memoryStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write))
                        {
                            await cryptoStream.WriteAsync(plain, 0, plain.Length);
                            cryptoStream.Close();

                            var ciphertext = memoryStream.ToArray();

                            return salt.Concat(ciphertext).ToArray();
                        }
                    }
                }
            }
        }

        ///////////////////////////////////////////////////////////////////////////
        //  Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3      //
        ///////////////////////////////////////////////////////////////////////////
        public static async Task<byte[]> Decrypt(byte[] cipher, string password)
        {
            using (var rijndael = Rijndael.Create())
            {
                rijndael.BlockSize = 128;
                rijndael.Mode = CipherMode.CBC;
                rijndael.KeySize = 256;
                rijndael.Padding = PaddingMode.PKCS7;

                var salt = cipher.Take(AESKeySaltBytes).ToArray();

                var ciphertext = cipher.Skip(AESKeySaltBytes).ToArray();

                using (var pdb = new Rfc2898DeriveBytes(password, salt, 1000))
                {
                    rijndael.Key = pdb.GetBytes(rijndael.KeySize / 8);
                    rijndael.IV = pdb.GetBytes(rijndael.BlockSize / 8);

                    using (var memoryStream = new MemoryStream())
                    {
                        using (var cryptoStream =
                               new CryptoStream(memoryStream, rijndael.CreateDecryptor(), CryptoStreamMode.Write))
                        {
                            await cryptoStream.WriteAsync(ciphertext, 0, ciphertext.Length);
                            cryptoStream.Close();

                            return memoryStream.ToArray();
                        }
                    }
                }
            }
        }

        #endregion
    }
}

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