using System;
using System.Security.Cryptography;
using System.Text;

namespace AyalaLauncherBeta2016
{
    public static class DPAPI
    {
        public static string Protect(
            this string clearText,
            string optionalEntropy = null,
            DataProtectionScope scope = DataProtectionScope.LocalMachine)
        {
            if (clearText == null)
                throw new ArgumentNullException("clearText");
            byte[] clearBytes = Encoding.UTF8.GetBytes(clearText);
            byte[] entropyBytes = string.IsNullOrEmpty(optionalEntropy)
                ? null
                : Encoding.UTF8.GetBytes(optionalEntropy);
            byte[] encryptedBytes = ProtectedData.Protect(clearBytes, entropyBytes, scope);
            return Convert.ToBase64String(encryptedBytes);
        }

        public static string Protect2(string stringToEncrypt, string optionalEntropy, DataProtectionScope scope)
        {
            return Convert.ToBase64String(
                ProtectedData.Protect(
                    Encoding.UTF8.GetBytes(stringToEncrypt)
                    , optionalEntropy != null ? Encoding.UTF8.GetBytes(optionalEntropy) : null
                    , scope));
        }

        public static string Unprotect2(string encryptedString, string optionalEntropy, DataProtectionScope scope)
        {
            return Encoding.UTF8.GetString(
                ProtectedData.Unprotect(
                    Convert.FromBase64String(encryptedString)
                    , optionalEntropy != null ? Encoding.UTF8.GetBytes(optionalEntropy) : null
                    , scope));
        }

        public static string Unprotect(
            this string encryptedText,
            string optionalEntropy = null,
            DataProtectionScope scope = DataProtectionScope.LocalMachine)
        {
            if (encryptedText == null)
                throw new ArgumentNullException("encryptedText");
            byte[] encryptedBytes = Convert.FromBase64String(encryptedText);
            byte[] entropyBytes = string.IsNullOrEmpty(optionalEntropy)
                ? null
                : Encoding.UTF8.GetBytes(optionalEntropy);
            byte[] clearBytes = ProtectedData.Unprotect(encryptedBytes, entropyBytes, scope);
            return Encoding.UTF8.GetString(clearBytes);
        }
    }
}