PHP/Java Function to Generate a Valid signed_body for Instagram

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I need a working PHP or JAVA (php is better) function that will generate a VALID signed_body parameter for a HTTP Post Request to Instagram.
I can provide some dumps of the valid signed_body's if necessary.
The function is needed asap.

Skills required:
Java, PHP
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