ecc: Implement the "nocomp" flag for key generation.

* cipher/ecc.c (ecc_generate): Support the "nocomp" flag.
* tests/keygen.c (check_ecc_keys): Add a test for it.

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

1 files changed, 8 insertions, 4 deletions

diff --git a/doc/gcrypt.texi b/doc/gcrypt.texi
index dd65f9a3..1619f0d4 100644
--- a/doc/gcrypt.texi
+++ b/doc/gcrypt.texi
@@ -2232,11 +2232,15 @@ are known:
 @table @code
 
 @item comp
+@itemx nocomp
 @cindex comp
-If supported and not yet the default return ECC points in compact
-(compressed) representation.  The compact representation requires a
-small overhead before a point can be used but halves the size of a to
-be conveyed public key.
+@cindex nocomp
+If supported by the algorithm and curve the @code{comp} flag requests
+that points are returned in compact (compressed) representation.  The
+@code{nocomp} flag requests that points are returned with full
+coordinates.  The default depends on the the algorithm and curve.
+The compact representation requires a small overhead before a point
+can be used but halves the size of a to be conveyed public key.
 
 @item pkcs1
 @cindex PKCS1