mpi: Add functions to manipulate the sign.

* src/gcrypt.h.in (gcry_mpi_is_neg): New.
(gcry_mpi_neg, gcry_mpi_abs): New.
* mpi/mpiutil.c (_gcry_mpi_is_neg): New.
(_gcry_mpi_neg, _gcry_mpi_abs): New.
* src/visibility.c, src/visibility.h: Add wrappers.
* src/libgcrypt.def, src/libgcrypt.vers: Export them.
* src/mpi.h (mpi_is_neg): New.  Rename old macro to mpi_has_sign.
* mpi/mpi-mod.c (_gcry_mpi_mod_barrett): Use mpi_has_sign.
* mpi/mpi-mpow.c (calc_barrett): Ditto.
* cipher/primegen.c (_gcry_derive_x931_prime): Ditto
* cipher/rsa.c (secret): Ditto.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/visibility.c b/src/visibility.c
index bb51d58e..0e244117 100644
--- a/src/visibility.c
+++ b/src/visibility.c
@@ -293,6 +293,24 @@ gcry_mpi_swap (gcry_mpi_t a, gcry_mpi_t b)
 }
 
 int
+gcry_mpi_is_neg (gcry_mpi_t a)
+{
+  return _gcry_mpi_is_neg (a);
+}
+
+void
+gcry_mpi_neg (gcry_mpi_t w, gcry_mpi_t u)
+{
+  _gcry_mpi_neg (w, u);
+}
+
+void
+gcry_mpi_abs (gcry_mpi_t w)
+{
+  _gcry_mpi_abs (w);
+}
+
+int
 gcry_mpi_cmp (const gcry_mpi_t u, const gcry_mpi_t v)
 {
   return _gcry_mpi_cmp (u, v);