scd:openpgp: Allow auto-changing of the key attributes in genkey.
210ba983557b
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Description

scd:openpgp: Allow auto-changing of the key attributes in genkey.

* scd/app-openpgp.c (struct app_local_s): Add field keyalgo.
(parse_algorithm_attribute): Store the new keyalgo field.
(change_keyattr): Change info message.
(change_keyattr_from_string): Rewrite to also accept a keyref and a
keyalgo string.
(do_genkey): Change the keyattr if a keyalgo string is given.
* scd/command.c (cmd_genkey): Add option --algo.

Having this feature makes it easier to use OpenPGP cards in a similar
way to other cards. Note that the explicit changing via SETATTR is
still supported.

(cherry picked from commit d7d75da50543bc7259c5a6e6367b58cbca7f1b7b)
(cherry picked from commit b349adc5c0d00d2fc405a45bd078f1580b5610cc)