[openssl-users] "openssl dgst" computes wrong HMAC?

Billy Brumley bbrumley at gmail.com
Tue Feb 3 10:16:06 UTC 2015

> $ echo -n foobar | openssl dgst -sha256 -hex -hmac aabbcc
> (stdin)= 6e74cdc3b72b8b66535b914357c7d656a22acbb1700b4e6de688fd5c091d305c

This gets posted every once in a while -- google around. Something
about the hmac switch not doing what you think it's doing.

$ echo -n foobar | openssl dgst -sha256 -mac HMAC -macopt hexkey:aabbcc
(stdin)= 985343745ee86b452c7c0b327171829c77e1a022f423d95156b52fa22083db8e


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