scd: Support PASSWD --clear for OpenPGP card.
fec75a3868da
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Description

scd: Support PASSWD --clear for OpenPGP card.

* scd/app-openpgp.c (do_change_pin): Implement handling
APP_CHANGE_FLAG_CLEAR.

It is specified in the specification version 3.1 or later. Some
version 2 cards (including Gnuk) support this feature. Any version 1
card has no support for this feature.

For CHVNO = 1, it clears for both of 81 and 82; That is, user's key
usages for signing and others (decryption and auth).
For CHVNO = 3, it clears for 83, admin key.

For CHVNO = 2, it clears 82; That is, user's key usages
others (decryption and auth).