cpp: Allow setting the curve to use when generating ECC keys

lang/cpp/src/gpggencardkeyinteractor.h (class GpgGenCardKeyInteractor):
Add enum Curve. Add member function setCurve.
lang/cpp/src/gpggencardkeyinteractor.cpp
(class GpgGenCardKeyInteractor::Private): Initialize simple members
in-class. Add member curve.
(GpgGenCardKeyInteractor::~GpgGenCardKeyInteractor): Use default d'tor.
(GpgGenCardKeyInteractor::setCurve): New.
(GpgGenCardKeyInteractor::action): Return curve defaulting to
Curve25519.
--

This enables users of this interactor to request the generation of
ECC keys with a specific curve as smart card keys. It's up to the user
to specify a curve that is actually supported by the smart card.

GnuPG-bug-id: 4429

1 files changed, 9 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index f9cd8651..fc434647 100644
--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,15 @@ Noteworthy changes in version 1.18.1 (unreleased)
  * qt: Fix problem with expiration dates after 2038-01-19 on 32-bit systems
    when adding an existing subkey to another key.  [T6137]
 
+ * cpp: Allow setting the curve to use when generating ECC keys
+   for smart cards.  [T4429]
+
+ * Interface changes relative to the 1.18.0 release:
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ cpp: GpgGenCardKeyInteractor::Curve        NEW.
+ cpp: GpgGenCardKeyInteractor::setCurve     NEW.
+
+
 Noteworthy changes in version 1.18.0 (2022-08-10)
 -------------------------------------------------