Revised patch to support the SmartCard-HSM in scdaemon

[NIIBE Yutaka]

Hello,

This is a reply to your message sent last year.

On 07/23/2014 06:04 AM, Andreas Schwier wrote:
> please find attached [1] the revised patch to GnuPG master, adding
> support for the SmartCard-HSM to scdaemon.

Recently, we received a post to gnupg-users about using the
SmartCard-HSM for OpenPGP.

  http://lists.gnupg.org/pipermail/gnupg-users/2015-July/053870.html

IIUC, the driver you submitted is intended to be used with gpgsm,
perhaps.  Please correct me if I'm wrong.

Do you have a plan to add the READKEY method so that it can work
for OpenPGP?

In gnupg/scd/app-openpgp.c, we have:
========================
/* Handle the READKEY command for OpenPGP.  On success a canonical
   encoded S-expression with the public key will get stored at PK and
   its length (for assertions) at PKLEN; the caller must release that
   buffer. On error PK and PKLEN are not changed and an error code is
   returned.  */
static gpg_error_t
do_readkey (app_t app, const char *keyid, unsigned char **pk, size_t *pklen)
========================

When it's available, gpg frontend can ask card for signing/decipher
for OpenPGP.

Creating OpenPGP from the public key in the card, we will need some
tool, though.
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