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changed the dir layout

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Werner Koch 1997-11-26 21:06:44 +00:00
parent 46900fbd43
commit e655f8de8d
14 changed files with 330 additions and 278 deletions
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29
mpi/mpi-pow.c
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@ -1,5 +1,6 @@
/* mpi-pow.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>
@ -35,6 +44,7 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
mpi_ptr_t rp, ep, mp, bp;
mpi_size_t esize, msize, bsize, rsize;
int esign, msign, bsign, rsign;
int esec, msec, bsec, rsec;
mpi_size_t size;
int mod_shift_cnt;
int negative_result;
@ -48,6 +58,11 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
esign = exp->sign;
msign = mod->sign;
esec = exp->secure;
msec = mod->secure;
bsec = base->secure;
rsec = res->secure;
rp = res->d;
ep = exp->d;
@ -67,7 +82,7 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
* mpn_divrem. This will make the intermediate values in the calculation
* slightly larger, but the correct result is obtained after a final
* reduction using the original MOD value. */
mp = mp_marker = mpi_alloc_limb_space(msize);
mp = mp_marker = mpi_alloc_limb_space(msize, msec);
count_leading_zeros( mod_shift_cnt, mod->d[msize-1] );
if( mod_shift_cnt )
mpihelp_lshift( mp, mod->d, msize, mod_shift_cnt );
@ -79,7 +94,7 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
if( bsize > msize ) { /* The base is larger than the module. Reduce it. */
/* Allocate (BSIZE + 1) with space for remainder and quotient.
* (The quotient is (bsize - msize + 1) limbs.) */
bp = bp_marker = mpi_alloc_limb_space( bsize + 1);
bp = bp_marker = mpi_alloc_limb_space( bsize + 1, bsec );
MPN_COPY( bp, base->d, bsize );
/* We don't care about the quotient, store it above the remainder,
* at BP + MSIZE. */
@ -103,7 +118,7 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
* parameters are identical to RES, defer deallocation of the old
* space. */
if( rp == ep || rp == mp || rp == bp ) {
rp = mpi_alloc_limb_space( size );
rp = mpi_alloc_limb_space( size, rsec );
assign_rp = 1;
}
else {
@ -115,18 +130,18 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
if( rp == bp ) {
/* RES and BASE are identical. Allocate temp. space for BASE. */
assert( !bp_marker );
bp = bp_marker = mpi_alloc_limb_space( bsize );
bp = bp_marker = mpi_alloc_limb_space( bsize, bsec );
MPN_COPY(bp, rp, bsize);
}
if( rp == ep ) {
/* RES and EXP are identical. Allocate temp. space for EXP. */
ep = ep_marker = mpi_alloc_limb_space( esize );
ep = ep_marker = mpi_alloc_limb_space( esize, esec );
MPN_COPY(ep, rp, esize);
}
if( rp == mp ) {
/* RES and MOD are identical. Allocate temporary space for MOD.*/
assert( !mp_marker );
mp = mp_marker = mpi_alloc_limb_space( msize );
mp = mp_marker = mpi_alloc_limb_space( msize, msec );
MPN_COPY(mp, rp, msize);
}
}
@ -137,7 +152,7 @@ mpi_powm( MPI res, MPI base, MPI exp, MPI mod)
{
mpi_size_t i;
mpi_ptr_t xp = xp_marker = mpi_alloc_limb_space( 2 * (msize + 1) );
mpi_ptr_t xp = xp_marker = mpi_alloc_limb_space( 2 * (msize + 1), msec );
int c;
mpi_limb_t e;
mpi_limb_t carry_limb;