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AndrewSav/GetSteamGuardCode.cs

Last active September 4, 2019 01:15
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Revisions

  1. AndrewSav revised this gist Sep 4, 2019. No changes.
  2. AndrewSav revised this gist Sep 4, 2019. No changes.
  3. AndrewSav created this gist Jul 28, 2017.
    12 changes: 12 additions & 0 deletions GetSteamGuardCode.cs
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,12 @@
    string GetSteamGuardCode(string base64SharedSecret)
    {
    long time = (long)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds + 10;
    byte[] timeHash = BitConverter.GetBytes(time/30).Reverse().ToArray();
    HMACSHA1 hmac = new HMACSHA1(Convert.FromBase64String(base64SharedSecret));
    hmac.Initialize();
    byte[] hash = hmac.ComputeHash(timeHash);
    int b = hash[19] & 0xF;
    int codePoint = (hash[b] & 0x7F) << 24 | (hash[b + 1] & 0xFF) << 16 | (hash[b + 2] & 0xFF) << 8 | (hash[b + 3] & 0xFF);
    string steamChars = "23456789BCDFGHJKMNPQRTVWXY";
    return new string(Enumerable.Range(0,5).Select(x => steamChars[codePoint/((int)Math.Pow(steamChars.Length,x)) % steamChars.Length]).ToArray());
    }