[PATCH] scd: writekey support of ECC

[NIIBE Yutaka]

On 2014-02-24 at 13:21 +0900, NIIBE Yutaka wrote:
> Last year, I lost the opportunity to merge my work of ECC smartcard
> support (specifically, ECDSA).  IIRC, we didn't have any agreements on
> ECDH.  I implemented ECDSA (with NIST P-256) on Gnuk around March
> 2013, and submitted partial change of GnuPG.  Perhaps, it was just the
> code enough to use with OpenSSH, and I forgot to send writekey change.

Reading the archive of gnupg-devel, it reminds me.  I stopped because
of lack of information for the tag value of ECDSA in the private key
template.  I posted to the list:

   OpenPGP card specification enhancement for ECDSA support: key import
   http://lists.gnupg.org/pipermail/gnupg-devel/2013-March/027487.html

Last year, I read JIS X 6320-8:2006 (Japanese one of ISO/IEC
7816-8:2004), which was reaffirmed in 2010-10-01.  There, we have RSA
example (not as standard) for private key template 7f48, but that's
all.

New revision of ISO/IEC 7816-8 is currently under development, and
perhaps, it will include ECDSA tag.
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