Why HMAC sha256 return different value on PHP & Javascript

Question

I am trying to build a HMAC SHA256 string in Javascript using CryptoJS, my existing code is written in PHP using the Akamai library.

In some cases I am getting diffe

Answer 1

CryptoJS add UTF8 encoding in "Key" while creating hash sha256 so that we are getting different value.

If i wrap utf8_encode in PHP side then we will get same hmac value as compare to JavaScript

     // <php>
     $key = chr(63) . chr(23) . chr(253);
     signature3 = hash_hmac('SHA256', "st=1453362060~exp=1453363260~acl=/*", utf8_encode($key));