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Removed files from the HEAD revision, because they are now in another
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Werner Koch
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165 changed files with 0 additions and 35058 deletions
409
mpi/mpiutil.c
409
mpi/mpiutil.c
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/* mpiutil.ac - Utility functions for MPI
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* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "g10lib.h"
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#include "mpi-internal.h"
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#include "memory.h"
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/****************
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* Note: It was a bad idea to use the number of limbs to allocate
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* because on a alpha the limbs are large but we normally need
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* integers of n bits - So we should chnage this to bits (or bytes).
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*
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* But mpi_alloc is used in a lot of places :-)
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*/
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MPI
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mpi_alloc( unsigned nlimbs )
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{
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MPI a;
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a = g10_xmalloc( sizeof *a );
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a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 0 ) : NULL;
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a->alloced = nlimbs;
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a->nlimbs = 0;
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a->sign = 0;
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a->flags = 0;
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return a;
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}
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void
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mpi_m_check( MPI a )
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{
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g10_check_heap(a);
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g10_check_heap(a->d);
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}
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MPI
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mpi_alloc_secure( unsigned nlimbs )
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{
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MPI a;
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a = g10_xmalloc( sizeof *a );
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a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 1 ) : NULL;
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a->alloced = nlimbs;
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a->flags = 1;
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a->nlimbs = 0;
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a->sign = 0;
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return a;
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}
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mpi_ptr_t
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mpi_alloc_limb_space( unsigned nlimbs, int secure )
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{
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size_t len = nlimbs * sizeof(mpi_limb_t);
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mpi_ptr_t p;
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p = secure? g10_xmalloc_secure( len ) : g10_xmalloc( len );
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return p;
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}
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void
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mpi_free_limb_space( mpi_ptr_t a )
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{
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if( !a )
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return;
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g10_free(a);
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}
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void
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mpi_assign_limb_space( MPI a, mpi_ptr_t ap, unsigned nlimbs )
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{
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mpi_free_limb_space(a->d);
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a->d = ap;
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a->alloced = nlimbs;
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}
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/****************
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* Resize the array of A to NLIMBS. the additional space is cleared
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* (set to 0) [done by g10_realloc()]
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*/
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void
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mpi_resize( MPI a, unsigned nlimbs )
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{
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if( nlimbs <= a->alloced )
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return; /* no need to do it */
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/* Note: a->secure is not used - instead the realloc functions
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* take care of it. Maybe we should drop a->secure completely
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* and rely on a mpi_is_secure function, which would be
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* a wrapper around g10_is_secure
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*/
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if( a->d )
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a->d = g10_xrealloc(a->d, nlimbs * sizeof(mpi_limb_t) );
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else /* FIXME: It may not be allocted in secure memory */
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a->d = g10_xcalloc( nlimbs , sizeof(mpi_limb_t) );
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a->alloced = nlimbs;
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}
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void
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mpi_clear( MPI a )
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{
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a->nlimbs = 0;
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a->flags = 0;
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}
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void
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mpi_free( MPI a )
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{
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if( !a )
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return;
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if( a->flags & 4 )
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g10_free( a->d );
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else {
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mpi_free_limb_space(a->d);
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}
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if( a->flags & ~7 )
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log_bug("invalid flag value in mpi\n");
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g10_free(a);
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}
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static void
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mpi_set_secure( MPI a )
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{
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mpi_ptr_t ap, bp;
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if( (a->flags & 1) )
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return;
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a->flags |= 1;
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ap = a->d;
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if( !a->nlimbs ) {
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assert(!ap);
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return;
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}
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bp = mpi_alloc_limb_space( a->nlimbs, 1 );
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MPN_COPY( bp, ap, a->nlimbs );
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a->d = bp;
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mpi_free_limb_space(ap);
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}
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MPI
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gcry_mpi_set_opaque( MPI a, void *p, unsigned int nbits )
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{
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if( !a ) {
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a = mpi_alloc(0);
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}
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if( a->flags & 4 )
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g10_free( a->d );
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else {
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mpi_free_limb_space(a->d);
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}
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a->d = p;
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a->alloced = 0;
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a->nlimbs = 0;
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a->sign = nbits;
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a->flags = 4;
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return a;
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}
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void *
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gcry_mpi_get_opaque( MPI a, unsigned int *nbits )
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{
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if( !(a->flags & 4) )
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log_bug("mpi_get_opaque on normal mpi\n");
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if( nbits )
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*nbits = a->sign;
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return a->d;
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}
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/****************
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* Note: This copy function should not interpret the MPI
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* but copy it transparently.
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*/
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MPI
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mpi_copy( MPI a )
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{
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int i;
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MPI b;
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if( a && (a->flags & 4) ) {
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void *p = g10_is_secure(a->d)? g10_xmalloc_secure( (a->sign+7)/8 )
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: g10_xmalloc( (a->sign+7)/8 );
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memcpy( p, a->d, (a->sign+7)/8 );
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b = gcry_mpi_set_opaque( NULL, p, a->sign );
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}
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else if( a ) {
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b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs )
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: mpi_alloc( a->nlimbs );
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b->nlimbs = a->nlimbs;
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b->sign = a->sign;
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b->flags = a->flags;
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for(i=0; i < b->nlimbs; i++ )
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b->d[i] = a->d[i];
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}
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else
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b = NULL;
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return b;
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}
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/****************
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* This function allocates an MPI which is optimized to hold
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* a value as large as the one given in the arhgument and allocates it
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* with the same flags as A.
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*/
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MPI
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mpi_alloc_like( MPI a )
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{
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MPI b;
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if( a && (a->flags & 4) ) {
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int n = (a->sign+7)/8;
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void *p = g10_is_secure(a->d)? g10_malloc_secure( n )
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: g10_malloc( n );
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memcpy( p, a->d, n );
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b = gcry_mpi_set_opaque( NULL, p, a->sign );
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}
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else if( a ) {
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b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs )
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: mpi_alloc( a->nlimbs );
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b->nlimbs = 0;
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b->sign = 0;
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b->flags = a->flags;
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}
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else
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b = NULL;
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return b;
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}
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void
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mpi_set( MPI w, MPI u)
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{
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mpi_ptr_t wp, up;
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mpi_size_t usize = u->nlimbs;
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int usign = u->sign;
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RESIZE_IF_NEEDED(w, usize);
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wp = w->d;
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up = u->d;
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MPN_COPY( wp, up, usize );
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w->nlimbs = usize;
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w->flags = u->flags;
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w->sign = usign;
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}
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void
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mpi_set_ui( MPI w, unsigned long u)
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{
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RESIZE_IF_NEEDED(w, 1);
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w->d[0] = u;
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w->nlimbs = u? 1:0;
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w->sign = 0;
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w->flags = 0;
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}
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MPI
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mpi_alloc_set_ui( unsigned long u)
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{
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MPI w = mpi_alloc(1);
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w->d[0] = u;
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w->nlimbs = u? 1:0;
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w->sign = 0;
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return w;
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}
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void
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mpi_swap( MPI a, MPI b)
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{
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struct gcry_mpi tmp;
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tmp = *a; *a = *b; *b = tmp;
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}
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GCRY_MPI
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gcry_mpi_new( unsigned int nbits )
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{
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return mpi_alloc( (nbits+BITS_PER_MPI_LIMB-1) / BITS_PER_MPI_LIMB );
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}
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GCRY_MPI
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gcry_mpi_snew( unsigned int nbits )
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{
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return mpi_alloc_secure( (nbits+BITS_PER_MPI_LIMB-1) / BITS_PER_MPI_LIMB );
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}
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void
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gcry_mpi_release( GCRY_MPI a )
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{
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mpi_free( a );
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}
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GCRY_MPI
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gcry_mpi_copy( const GCRY_MPI a )
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{
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return mpi_copy( (GCRY_MPI)a );
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}
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GCRY_MPI
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gcry_mpi_set( GCRY_MPI w, const GCRY_MPI u )
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{
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if( !w )
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w = mpi_alloc( mpi_get_nlimbs(u) );
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mpi_set( w, (GCRY_MPI)u );
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return w;
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}
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GCRY_MPI
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gcry_mpi_set_ui( GCRY_MPI w, unsigned long u )
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{
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if( !w )
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w = mpi_alloc(1);
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mpi_set_ui( w, u );
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return w;
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}
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int
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gcry_mpi_cmp( const GCRY_MPI u, const GCRY_MPI v )
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{
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return mpi_cmp( (GCRY_MPI)u, (GCRY_MPI)v );
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}
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int
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gcry_mpi_cmp_ui( const GCRY_MPI u, unsigned long v )
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{
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return mpi_cmp_ui( (GCRY_MPI)u, v );
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}
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void
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gcry_mpi_randomize( GCRY_MPI w,
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unsigned int nbits, enum gcry_random_level level )
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{
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char *p = mpi_is_secure(w) ? gcry_random_bytes( (nbits+7)/8, level )
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: gcry_random_bytes_secure( (nbits+7)/8, level );
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mpi_set_buffer( w, p, (nbits+7)/8, 0 );
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g10_free(p);
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}
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void
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gcry_mpi_set_flag( GCRY_MPI a, enum gcry_mpi_flag flag )
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{
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switch( flag ) {
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case GCRYMPI_FLAG_SECURE: mpi_set_secure(a); break;
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case GCRYMPI_FLAG_OPAQUE:
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default: log_bug("invalid flag value\n");
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}
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}
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void
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gcry_mpi_clear_flag( GCRY_MPI a, enum gcry_mpi_flag flag )
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{
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switch( flag ) {
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case GCRYMPI_FLAG_SECURE:
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case GCRYMPI_FLAG_OPAQUE:
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default: log_bug("invalid flag value\n");
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}
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}
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int
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gcry_mpi_get_flag( GCRY_MPI a, enum gcry_mpi_flag flag )
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{
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switch( flag ) {
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case GCRYMPI_FLAG_SECURE: return (a->flags & 1);
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case GCRYMPI_FLAG_OPAQUE: return (a->flags & 4);
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default: log_bug("invalid flag value\n");
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}
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}
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