Is there a way to redeem Steam games from Steam keys while I'm not on my PC? [duplicate]

I'm going to be away from the country (and from my PC) for a month. However, I'm going to receive some steam keys from a friend sometime next week, and I was wondering if there was a way for me to redeem steam games while I'm away.

I only have my mobile phone (Android) and tablet (iOS) while I'm away.

Is there a way for me to redeem steam games without a PC?

No. The only official Valve software which allows you to redeem keys is the Steam PC (or Mac) client.

As for unofficial... the only reverse-engineering effort of Steam I know of is SteamKit. One of the lead developers has stated SteamKit intentionally doesn't support redeeming keys because..

There's no good reason to expose an API that could be potentially used to bruteforce CD keys.

Without that reverse engineering effort (which takes an incredible amount of skill and knowledge to do, the vast majority of programmers would not be able to pull it off on their own), no regular developer can create a phone app which can redeem CD keys.