Just a guess, since you don't say what you expect to get as a result in $step2: Does hmac_sha256_hex($step1, pack("H*",$appkey)) help?

Update:

I am using hmac_sha256_hex as the app key string is in hex.

I believe the general naming convention in many of the Digest::* modules is that the suffix _hex on the function name refers to their return value, and not their arguments.

In reply to Re: HMAC Sha256 Help! (updated) by haukex
in thread HMAC Sha256 Help! by ribble

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