ecc: Add key generation flag "no-keytest".

* src/cipher.h (PUBKEY_FLAG_NO_KEYTEST): New.
* cipher/pubkey-util.c (_gcry_pk_util_parse_flaglist): Add flag
"no-keytest".  Return an error for invalid flags of length 10.

* cipher/ecc.c (nist_generate_key): Replace arg random_level by flags
set random level depending on flags.
* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_genkey): Ditto.
* cipher/ecc.c (ecc_generate): Pass flags to generate fucntion and
remove var random_level.
(nist_generate_key): Implement "no-keytest" flag.

* tests/keygen.c (check_ecc_keys): Add tests for transient-key and
no-keytest.
--

After key creation we usually run a test to check whether the keys
really work.  However for transient keys this might be too time
consuming and given that a failed test would anyway abort the process
the optional use of a flag to skip the test is appropriate.

Using Ed25519 for EdDSA and the "no-keytest" flags halves the time to
create such a key.  This was measured by looping the last test from
check_ecc_keys() 1000 times with and without the flag.

Due to a bug in the flags parser unknown flags with a length of 10
characters were not detected.  Thus the "no-keytest" flag can be
employed by all software even for libraries before this.  That bug is
however solved with this version.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 4c74533a..d90ee6d3 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,10 @@ Noteworthy changes in version 1.7.0 (unreleased)
 
  * Added OCB mode.
 
+ * New flag "no-keytest" for ECC key generation.  Due to a bug in the
+   parser that flag will also be accepted but ignored by older version
+   of Libgcrypt.
+
  * Interface changes relative to the 1.6.0 release:
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  gcry_mac_get_algo               NEW.