A simple Android app written in Basic4Android.
Its purpose is to generate smartcard unblock codes using your Admin key and your phone instead of requiring a computer.
The common SLE4442 cards are memory cards only and lack a built-in processor, and thus are for data storage only.
Real smartcards are the ones such as the Gemalto IDPrime 930, YubiKey, JavacardOS [...]. Its Windows equivalent would be the Gemalto Response Code calculator.
Android PIN Unblocker has a very simple set of features, it doesn't do anything else than generating the Response Code.
If you need to generate sha256, sha384 or sha512 hashes for your Admin key then you can use a different existing Android application to generate it.
I added the ability to scan QR codes in Android PIN Unblocker using the below Basic4Android library:
It's used alongside a PC application such as CodeTwo QR Code Reader & Generator to do the card unblocking more efficiently.
You can later install an agent program into e.g. employees' computers to type the unblock code with the Android Share To functionality.
On a real Android phone the display has an higher resolution and thus you'll have more space to type the Admin key than on this screenshot.
Here you can type the Request Code and also choose to hide the Admin key with the checkbox below it.
This application has been intended for situations where you're entering unblock codes for employees or people who stand-by next to you.
You can thus now easily type your Admin key once, then hide it with the appropriate checkbox below it.
This way nobody accidentally grabs a picture of your Admin key while unblocking your employees' smartcards.
You can see on the previous screenshot a Share To button next to the generated Response Code, which will pop the native Android Intent chooser.
From there you can share the Response Code over to Telegram, Signal, WhatsApp, SMS, and so on.
Here you can see that it's possible to write your Admin key on a native Android note-taking application then select the text, which you can directly share to Android PIN Unblocker.
That's also where you can generate Admin key hashes yourself with a different Android app then share the generated hash to Android PIN Unblocker.
The App automatically verifies whether the shared text is a valid 32 or 48 digits string and is made of 0-9 A-F characters only (hex chars). The App discards shared texts that are invalid Admin keys and will simply behave as if you launched it yourself.
I decided to allow 32-digits Admin keys since that's what some smartcard manufacturers actually use.
Whenever you share an Admin key to the app instead of copy-pasting it yourself, the Hide Admin Key checkbox becomes disabled and you cannot unhide it.
This feature prevents accidental disclosure of your Admin key while unblocking cards on your employees' computers.
Make sure to verify whether your Android ROM doesn't have a clipboard history prior to copy-pasting Admin keys (Samsung & Huawei have one).
If clipboard history cannot be disabled then use a different keyboard application instead of your Android built-in one.
Well I don't care about legalese anyway but let's pick GNU GPLv3 (or later version) since my friends at the Free Software Foundation recommend it.
Basic4Android also allows completely free usage of their IDE for both commercial and non-commercial purposes so it should be OK.