commit b94081bfc18e0e53678d615213a17978eafe335c
author Paul Bakker <p.j.bakker@polarssl.org> Wed Jan 05 15:53:06 2011 +0000
committer Paul Bakker <p.j.bakker@polarssl.org> Wed Jan 05 15:53:06 2011 +0000
tree c135c0fc535b30b9bc5d2b7f98eda2e48f379c27
parent ccba9bc42d25b79044cebee52a131a7fb2268e18

 - Make A only smaller if it is larger than |X| - 1

library/bignum.c

diff --git a/library/bignum.c b/library/bignum.c
index 78e9384..55188b7 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -1746,8 +1746,11 @@
         for( j = 0; j < A.n * ciL; j++ )
             *p++ = (unsigned char) f_rng( p_rng );
 
-        j = mpi_msb( &A ) - mpi_msb( &W );
-        MPI_CHK( mpi_shift_r( &A, j + 1 ) );
+        if( mpi_cmp_mpi( &A, &W ) >= 0 )
+        {
+            j = mpi_msb( &A ) - mpi_msb( &W );
+            MPI_CHK( mpi_shift_r( &A, j + 1 ) );
+        }
         A.p[0] |= 3;
 
         /*