AdvancedLauncher.Tools.PassEncrypt.Decrypt C# (CSharp) Метод

        public static string Decrypt(string cipherText, string passPhrase)
        {
            if (string.IsNullOrEmpty(cipherText)) {
                return null;
            }
            byte[] initVectorBytes = Encoding.ASCII.GetBytes(getInitVector());
            byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
            PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
            byte[] keyBytes = password.GetBytes(keysize / 8);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
            MemoryStream memoryStream = new MemoryStream(cipherTextBytes);

            using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read)) {
                byte[] plainTextBytes = new byte[cipherTextBytes.Length];
                int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
                return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
            }
        }