ecc: Prepare for future Ed25519 optimization.

* mpi/ec-ed25519.c: New but empty file.
* mpi/ec-internal.h: New.
* mpi/ec.c: Include ec-internal.h.
(ec_mod): New.
(ec_addm): Use ec_mod.
(ec_mulm): Remove commented code.  Use ec_mod.
(ec_subm): Call simple sub.
(ec_pow2): Use ec_mulm.
(ec_mul2): New.
(dup_point_weierstrass): Use ec_mul2.
(dup_point_twistededwards): Add special case for a == -1.  Use
ec_mul2.
(add_points_weierstrass): Use ec_mul2.
(add_points_twistededwards): Add special case for a == -1.
(_gcry_mpi_ec_curve_point): Ditto.
(ec_p_init): Add hack to test Barrett functions.
* src/ec-context.h (mpi_ec_ctx_s): Add P_BARRETT.

* mpi/mpi-mod.c (_gcry_mpi_mod_barrett): Fix sign problem.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/src/ec-context.h b/src/ec-context.h
index 8dce7a7c..ba6bdfc6 100644
--- a/src/ec-context.h
+++ b/src/ec-context.h
@@ -53,6 +53,8 @@ struct mpi_ec_ctx_s
 
     gcry_mpi_t two_inv_p;
 
+    mpi_barrett_t p_barrett;
+
     /* Scratch variables.  */
     gcry_mpi_t scratch[11];