Forum Discussion
DavidW_20496
Nimbostratus
NimbostratusHMAC Question
F5 posted an example for generating an HMAC based on sha256
https://devcentral.f5.com/wiki/iRules.HMAC.ashx
In the line 31 there is
set token [sha256 $opad[sha256 "${ipad}${message}"]]
...
Looks like TCL allows for that sort of concatenation. I took a few minutes but didn't find a documented example of it. The code example does work, however, and modifying it to the following still returns the same results.
set innerdata [sha256 "${ipad}${message}"]
set token [sha256 "${opad}${innerdata}"]
