Authorize.net SIM intergration

Hi Guys,
I am trying to setup SIM intergration for my authorize.net merchant account however I do not have mhash compiled in php (and I do not want to risk recompiling it as I am not comfortable doing so). I email authorize.net about this and they said:

"Greetings from Authorize.Net!

You need to get your web hosting provider to re-compile php with mhash support or you will need to locate a third party module that has a function for creating HMAC md5 hashes. Thanks for your time!"

Well after spending hours looking for a third party module that has a function for creating HMAC md5 hashes. Anyone know where I can get one??? I would be VERRRRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY greatful if someone could please help - thanks guys !!

 

 

 

 

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