Openssl digest with hexadecimal coded input

Question

Does anyone knows how the dgst function of the Openssl library manage the input value? I mean, it considers the input value as ASCII characters or in any other charset encoding?
I'm trying to input hexadecimal values but can't find how to do this:

$echo -n "FFFF" | openssl dgst -sha256

The result is different from the obtained by other ways (e.g. Java's MessageDigest) with the hexadecimal number '0xFFFF' as input.

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– jww, Commented Dec 18, 2015 at 6:04

Leśny Rumcajs · Accepted Answer · 2015-12-16 14:04:01Z

0

Normally dgst takes ASCII input, to get hash of 0xFFFF try:

printf "\xFF\xFF" | openssl dgst -sha256

The result should be: ca2fd00fa001190744c15c317643ab092e7048ce086a243e2be9437c898de1bb

answered Dec 16, 2015 at 14:04

Leśny Rumcajs

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2 Comments

CarlosRos Over a year ago

That's correct. Now I must figure out how to convert large hex numbers into that format.

Leśny Rumcajs Over a year ago

For example using one of the many answers from here: stackoverflow.com/questions/1604765/… . You'll probably want to write a bash script to even further simplify your sha256 digest usage.

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