file(1) magic pattern for age

[aerth]

I created a (very) basic magic pattern so that file(1) can tell the user
that a data file was created with age (without the ascii armored, we get
the version number too). I didn't add a MIME type.

Sample outputs:

/tmp/age.txt: age encrypted data (ascii armored)
/tmp/age.dat: age encrypted data Version: 1

To add this to your magic database, create the /etc/file/magic/age file
and run the following line, as root:

# cd /etc/file && /usr/bin/file --compile

--- The rest of this message is the contents of /etc/file/magic/age ---

#------------------------------------------------------------------------------
# $File: age,v 1.1 2020/05/28 16:20:00 aerth Exp $
# age: file(1) magic for age encryption files
#
# format spec: https://age-encryption.org/v1

0 string -----BEGIN\040AGE\040 age encrypted data (ascii armored)
0 string age-encryption.org/ age encrypted data
>20 string x Version: %s

[br...@bsull.com]

Very cool! I use file all the time, this will surely be useful.

Cheers

Brady Sullivan

> On May 27, 2020, at 21:40, aerth <ae...@memeware.net> wrote:
>
> I created a (very) basic magic pattern so that file(1) can tell the user that a data file was created with age (without the ascii armored, we get the version number too). I didn't add a MIME type.

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[Jack Grigg]

Very nice!

Note that per the age specification, the version arbitrary string in the first line begins immediately after the "/", so the current age format version is "v1", not "1". Future formats could have any version string here, e.g. "squeamish-ossifrage" is a valid version. So it would be great to update this to not assume a "v" prefix.

Cheers,

Jack