DavidW_20496
Feb 24, 2015Nimbostratus
HMAC 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}"]]
The inner sha256 takes a string parameter. The outer sha256 seems to take a string concatennated with the byte array result of the inner sha256.... This looks very odd to concattenate different types. What actually happens here ?