Jack, it looks like you're close to having an RPG solution. Using iconv()
for EBCDIC to ASCII conversion was one key. Just to be clear, both your
"key" and your "data" must be converted to ASCII before calling

We went through this a couple months ago. Very similar scenario. We needed
an RPG "hash" procedure which mimics the PHP hash_hmac() function.

Understand that Qc3CalculateHash() supports the following encryption

MD5 c 1
SHA1 c 2
SHA256 c 3
SHA384 c 4
SHA512 c 5

So I'd recommend creating a SINGLE procedure which has the same parameters
as the PHP hash_hmac() function.

Note that hash_hmac() converts the hash to lower case, by default.

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