Hi all,
Is the length of MAC algorithm constant or variable? For example, is the
output of a HMAC-SHA1 always be 20 bytes length? Can I specify it to be
a different length, for e.g. 16 bytes?
I know the output length is determined by the hash function it implies.
So the problem turns into "Can OpenSSL hash function outputs a specified
(normally shorter) length of hash?"
Thanks and regards,
Peter Lin
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