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

namespace D2Multi
{
    static class D2AccountCrypto
    {
        static readonly byte[] Entropy = Encoding.UTF8.GetBytes("D2Multi.Accounts.v1");

        public static string Protect(string plain)
        {
            if (string.IsNullOrEmpty(plain))
                return string.Empty;
            var bytes = Encoding.UTF8.GetBytes(plain);
            var protectedBytes = ProtectedData.Protect(bytes, Entropy, DataProtectionScope.CurrentUser);
            return Convert.ToBase64String(protectedBytes);
        }

        public static string Unprotect(string base64Cipher)
        {
            if (string.IsNullOrEmpty(base64Cipher))
                return string.Empty;
            try
            {
                var protectedBytes = Convert.FromBase64String(base64Cipher);
                var bytes = ProtectedData.Unprotect(protectedBytes, Entropy, DataProtectionScope.CurrentUser);
                return Encoding.UTF8.GetString(bytes);
            }
            catch
            {
                return string.Empty;
            }
        }
    }
}