diff options
Diffstat (limited to 'mpi/mpi-mul.c')
| -rw-r--r-- | mpi/mpi-mul.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/mpi/mpi-mul.c b/mpi/mpi-mul.c index aa5beb73b..85ee1d8c5 100644 --- a/mpi/mpi-mul.c +++ b/mpi/mpi-mul.c @@ -1,5 +1,6 @@ /* mpi-mul.c - MPI functions * Copyright (c) 1997 by Werner Koch (dd9jn) + * Copyright (C) 1994, 1996 Free Software Foundation, Inc. * * This file is part of G10. * @@ -16,6 +17,14 @@ * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + * + * Note: This code is heavily based on the GNU MP Library. + * Actually it's the same code with only minor changes in the + * way the data is stored; this is to support the abstraction + * of an optional secure memory allocation which may be used + * to avoid revealing of sensitive data due to paging etc. + * The GNU MP Library itself is published under the LGPL; + * however I decided to publish this code under the plain GPL. */ #include <config.h> @@ -107,24 +116,28 @@ mpi_mul( MPI w, MPI u, MPI v) mpi_size_t usize, vsize, wsize; mpi_ptr_t up, vp, wp; mpi_limb_t cy; - int usign, vsign, sign_product; + int usign, vsign, usecure, vsecure, sign_product; int assign_wp=0; mpi_ptr_t tmp_limb=NULL; if( u->nlimbs < v->nlimbs ) { /* Swap U and V. */ usize = v->nlimbs; usign = v->sign; + usecure = v->secure; up = v->d; vsize = u->nlimbs; vsign = u->sign; + vsecure = u->secure; vp = u->d; } else { usize = u->nlimbs; usign = u->sign; + usecure = u->secure; up = u->d; vsize = v->nlimbs; vsign = v->sign; + vsecure = v->secure; vp = v->d; } sign_product = usign ^ vsign; @@ -134,7 +147,7 @@ mpi_mul( MPI w, MPI u, MPI v) wsize = usize + vsize; if( w->alloced < wsize ) { if( wp == up || wp == vp ) { - wp = mpi_alloc_limb_space( wsize ); + wp = mpi_alloc_limb_space( wsize, w->secure ); assign_wp = 1; } else { @@ -145,7 +158,7 @@ mpi_mul( MPI w, MPI u, MPI v) else { /* Make U and V not overlap with W. */ if( wp == up ) { /* W and U are identical. Allocate temporary space for U. */ - up = tmp_limb = mpi_alloc_limb_space( usize ); + up = tmp_limb = mpi_alloc_limb_space( usize, usecure ); /* Is V identical too? Keep it identical with U. */ if( wp == vp ) vp = up; @@ -154,7 +167,7 @@ mpi_mul( MPI w, MPI u, MPI v) } else if( wp == vp ) { /* W and V are identical. Allocate temporary space for V. */ - vp = tmp_limb = mpi_alloc_limb_space( vsize ); + vp = tmp_limb = mpi_alloc_limb_space( vsize, vsecure ); /* Copy to the temporary space. */ MPN_COPY( vp, wp, vsize ); } |