commit e282012219d7b348e5ce5e06ed322203d074d223
author Manuel Pégourié-Gonnard <mpg@elzevir.fr> Thu Nov 21 10:08:50 2013 +0100
committer Manuel Pégourié-Gonnard <mpg@elzevir.fr> Thu Nov 21 21:56:38 2013 +0100
tree 08ecc41be2d6f00a951d5ea65d4064628c3dc884
parent edc1a1f482895ab61032c7c9fbcd718a184acc40

Spare some memory

library/ecp.c

diff --git a/library/ecp.c b/library/ecp.c
index 2ff8820..d7a4567 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -1353,6 +1353,14 @@
 
     ecp_normalize_many( grp, TT, k );
 
+    /*
+     * Post-precessing: reclaim some memory by not storing Z (always 1)
+     */
+    for( i = 0; i < ( 1U << (w-1) ); i++ )
+    {
+        mpi_free( &T[i].Z );
+    }
+
 cleanup:
     return( ret );
 }
@@ -1368,6 +1376,9 @@
     /* Ignore the "sign" bit */
     MPI_CHK( ecp_copy( R, &T[ ( i & 0x7Fu ) >> 1 ] ) );
 
+    /* Restore the Z coordinate */
+    MPI_CHK( mpi_lset( &R->Z, 1 ) );
+
     /*
      * -R = (R.X, -R.Y, R.Z), and
      * -R.Y mod P = P - R.Y unless R.Y == 0