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bug#22405: 25.1.50; Recent changes break epg's ability to read from the

From: Daiki Ueno
Subject: bug#22405: 25.1.50; Recent changes break epg's ability to read from the gpg card
Date: Mon, 08 Feb 2016 11:04:11 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

Manoj Srivastava <address@hidden> writes:

>         I have a gpg card which I use to store my signing sub keys
> on. Sometime between December 15 and January 15th, I can no longer send
> gpg signed emails using mml2016 and epg when I use a secring.gpg that
> refers to keys on the card.
>         I can:
>  1. Read mail in Gnus and decrypt encrypted emails sent to me
>  2. Load gpg encrypted .el files during startup.
>  3. Verify signatures in emails.
>  If I try to send a gpg signed message, I get the error with the
> back trace appended below. Based on trying to step through the
> mml2015-sign  function, epg-sign-string returns nil, which leads to the
> error.  epg does seem to talk to the card: I am prompted for a PIN (not
> a passphrase), and the card signature count does get incremented.
>         When I replace the secring.pgp with one that contains my mey
> itself, I can successfully  sign emails. I can consistently reproduce
> this failure.

I don't see any significant change in epg during that period, but there
are potentially several factors (e.g. new GnuPG versions, mml2015
rework) that could cause the problem.  Could you try `M-x
epa-sign-region' to isolate the problem?

Also I would like to ask you to gather more information with the steps
described in:

Daiki Ueno

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