Curve25519 support.

* agent/cvt-openpgp.c (get_keygrip): Handle Curve25519.
(convert_secret_key, convert_transfer_key): Ditto.
* common/openpgp-oid.c (oidtable): Add Curve25519.
(oid_crv25519, openpgp_oid_is_crv25519): New.
* common/util.h (openpgp_oid_is_crv25519): New.
* g10/ecdh.c (pk_ecdh_encrypt_with_shared_point): Handle the case
with Montgomery curve which uses x-only coordinate.
* g10/keygen.c (gen_ecc): Handle Curve25519.
(ask_curve): Change the API and second arg is to return subkey algo.
(generate_keypair, generate_subkeypair): Follow chage of ask_curve.
* g10/keyid.c (keygrip_from_pk): Handle Curve25519.
* g10/pkglue.c (pk_encrypt): Handle Curve25519.
* g10/pubkey-enc.c (get_it): Handle the case with Montgomery curve.
* scd/app-openpgp.c (ECC_FLAG_DJB_TWEAK): New.
(send_key_attr): Work with general ECC, Ed25519, and Curve25519.
(get_public_key): Likewise.
(ecc_writekey): Handle flag_djb_tweak.

--

When libgcrypt has Curve25519, GnuPG now supports Curve25519.

1 files changed, 1 insertions, 0 deletions

diff --git a/common/util.h b/common/util.h
index df0f39290..66749eaaa 100644
--- a/common/util.h
+++ b/common/util.h
@@ -322,6 +322,7 @@ size_t percent_unescape_inplace (char *string, int nulrepl);
 gpg_error_t openpgp_oid_from_str (const char *string, gcry_mpi_t *r_mpi);
 char *openpgp_oid_to_str (gcry_mpi_t a);
 int openpgp_oid_is_ed25519 (gcry_mpi_t a);
+int openpgp_oid_is_crv25519 (gcry_mpi_t a);
 const char *openpgp_curve_to_oid (const char *name, unsigned int *r_nbits);
 const char *openpgp_oid_to_curve (const char *oid, int canon);
 const char *openpgp_enum_curves (int *idxp);