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bug#43421: Encoding issue in exported archive signatures

From: Ludovic Courtès
Subject: bug#43421: Encoding issue in exported archive signatures
Date: Tue, 15 Sep 2020 17:42:24 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)


Ludovic Courtès <ludovic.courtes@inria.fr> skribis:

> Following the ‘guix authenticate’ in commit
> 64cf660f872fb7aaf0d2b463e45b4c756297f743¹, I’m observing encoding
> issues:
>   guix archive --export \
>     /gnu/store/3p5wcw2a0844rbcmlrqfjx8bx7b7gq34-r-rvest-0.3.6-guile-builder
> yield an archive with this signature:
> (signature
>  (data
>   (flags rfc6979)
>   (hash sha256 
> #1DEE0418AF5FD8A05D2142290BA03735176FA27BB68B3A02977C774EA3DBDAEC#)
>   )
>  (sig-val
>   (ecdsa
>    (r #072B8E5C6B84D4ED469EC2CF63103621602E9AF3902E454CAD49CFA6BDE2FBF0#)
>    (s "~%*Øw2%YZ»+yvc*¤Ì44C;RM\t3EQIp<ü")
>    )
>   )
>  (public-key
>   (ecc
>    (curve Ed25519)
>    (q #8D156F295D24B0D9A86FA5741A840FF2D24F60F7B6C4134814AD55625971B394#)
>    )
>   )
>  )
> Notice the ‘s’ field of the signature.
> The problem does not occur systematically: it depends on the byte string
> (libgcrypt encodes Latin-1ish strings as strings and other strings as
> hex sequences.)  The problem is similar to 
> <https://issues.guix.gnu.org/17312>.

Fixed in b911d6547444b5f8d17b224bafa5ee1b5aafaff5!

> The interesting bit is that this archive can be correctly ingested by a
> new daemon, but it fails signature verification with an older daemon.

This is because when using the new daemon on both sides, we were
encoding/decoding strings as UTF-8, which made no sense but worked
well.  Older implementations rightfully expect “raw strings”
aka. ISO-8859-1.


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