Hi everyone
Hopefully someone will take pity on me and provide some answers
(I'm trying to get the sympathy vote)
Before I forget, as I usually do, we are on V5r4.

As part of a web service, I have to provide an authentication token which
"is calculated using the HMAC (keyed-Hash Message Authentication Code) algorithm. This is a type of message authentication code (MAC) calculated using a specific algorithm involving a cryptographic hash function in
combination with a secret key (the shared secret)."
The result of this is to be Hex encoded
What I have done is used the API Qc3CalculateHMAC for SHA_256 (prior e-mail submitted and people have graciously responded)
The result of this calculation is then to be Hex encoded, so I have then used a service program that utilizes
QtqIconvOpen, iconv and iconv_close.
The transmission of this data is being rejected due to the HMAC hex encoded field being incorrect.
I then discovered that the site I am transmitting to is "a Linux system so we are working in ASCII. Use UTF-8." As I was told.
So I thought that I would need to covert the string (and the secret shared password) into the API Qc3CalculateHMAC into UTF-8 (CCSID 1208) - then use the service program that utilizes
QtqIconvOpen, iconv and iconv_close.
However, the rest of the web_service transmission contains EBCDIC values, so I assumed that the Hex encoded value had to be converted BACK to EBCDIC so that the XML transmission would ALL be in EBCDIC to be translated to UTF-8 as part of the transmission
To cut a LOOOOOOOOONG story short, I have tried so many permutations and combinations of what is to be iconved before and after the Qc3CalculateHMAC I don't know where I am
Needless to say ALL of my test transmissions have failed
If anyone has a clearer had than me (who hasn't) and can point me in a good direction, I would be VERY grateful.

Alan Shore
Programmer/Analyst, Direct Response
P:(631) 200-5019
C:(631) 880-8640
"If you're going through Hell, keep going" - Winston Churchill

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