Decompile Java code (Oauth authorization) - repost

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Project Budget (USD)
$250 - $750

Project Description:
There's a service called Pinger at
Thy have mobile apps, desktop and online clients.
Each app uses OAuth authorization, it's different for different requests.

Desktop client is written on QT, web client is Flash. They are more easy to analyze to understand how authorization works, cause you can use sniffer to get the headers. Web client can't be used though to finish this project, cause it doesn't execute a request that is needed here.
Desktop version is fine, but since it's on QT, it's hard to analyze it.
Android app (JAVA) easily decompiles, but if obfuscated.

Request must work at this links:
[url removed, login to view]:56:36Z (or with any other date)
and [url removed, login to view]

Authorization happenes via the header "Authorization"
Example of a header:
OAuth realm="[url removed, login to view]", oauth_consumer_key="503473425%3Bpinger-desktop-client-26059089-40cb-4c5f-9c1d-2fa6b6f03160", oauth_signature_method="HMAC-SHA1", oauth_signature="K2nmpuwFFtWSgIlIouM9SaSWqdc%3D", oauth_timestamp="1385662737691", oauth_nonce="%7B605064b1-b843-40f9-a970-7f5b0dc07510%7D"

After successful authorization server returns an answer is JSON format, in which there's information about calls, messages, etc.
So what we need is a method to generate this headers based on any specific account.

See files attached.

I know it's pretty complicated description. If you're not familiar with Pinger, register account there, install app and clients. And if you need more info, just ask.

Happy bidding!

Skills required:
Additional Files: Pinger.apk
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