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gnupg/mpi/mpiutil.c

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/* mpiutil.ac - Utility functions for MPI
* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "mpi.h"
#include "mpi-internal.h"
#include "memory.h"
#include "util.h"
#ifdef M_DEBUG
#undef mpi_alloc
#undef mpi_alloc_secure
#undef mpi_free
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#endif
/****************
* Note: It was a bad idea to use the number of limbs to allocate
* because on a alpha the limbs are large but we normally need
* integers of n bits - So we should chnage this to bits (or bytes).
*
* But mpi_alloc is used in a lot of places :-)
*/
MPI
#ifdef M_DEBUG
mpi_debug_alloc( unsigned nlimbs, const char *info )
#else
mpi_alloc( unsigned nlimbs )
#endif
{
MPI a;
if( DBG_MEMORY )
log_debug("mpi_alloc(%u)\n", nlimbs*BITS_PER_MPI_LIMB );
#ifdef M_DEBUG
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a = m_debug_alloc( sizeof *a, info );
a->d = nlimbs? mpi_debug_alloc_limb_space( nlimbs, 0, info ) : NULL;
#else
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a = m_alloc( sizeof *a );
a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 0 ) : NULL;
#endif
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a->alloced = nlimbs;
a->nlimbs = 0;
a->sign = 0;
a->flags = 0;
a->nbits = 0;
return a;
}
void
mpi_m_check( MPI a )
{
m_check(a);
m_check(a->d);
}
MPI
#ifdef M_DEBUG
mpi_debug_alloc_secure( unsigned nlimbs, const char *info )
#else
mpi_alloc_secure( unsigned nlimbs )
#endif
{
MPI a;
if( DBG_MEMORY )
log_debug("mpi_alloc_secure(%u)\n", nlimbs*BITS_PER_MPI_LIMB );
#ifdef M_DEBUG
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a = m_debug_alloc( sizeof *a, info );
a->d = nlimbs? mpi_debug_alloc_limb_space( nlimbs, 1, info ) : NULL;
#else
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a = m_alloc( sizeof *a );
a->d = nlimbs? mpi_alloc_limb_space( nlimbs, 1 ) : NULL;
#endif
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a->alloced = nlimbs;
a->flags = 1;
a->nlimbs = 0;
a->sign = 0;
a->nbits = 0;
return a;
}
#if 0
static void *unused_limbs_5;
static void *unused_limbs_32;
static void *unused_limbs_64;
#endif
mpi_ptr_t
#ifdef M_DEBUG
mpi_debug_alloc_limb_space( unsigned nlimbs, int secure, const char *info )
#else
mpi_alloc_limb_space( unsigned nlimbs, int secure )
#endif
{
size_t len = nlimbs * sizeof(mpi_limb_t);
mpi_ptr_t p;
if( DBG_MEMORY )
log_debug("mpi_alloc_limb_space(%u)\n", (unsigned)len*8 );
#if 0
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if( !secure ) {
if( nlimbs == 5 && unused_limbs_5 ) { /* DSA 160 bits */
p = unused_limbs_5;
unused_limbs_5 = *p;
return p;
}
else if( nlimbs == 32 && unused_limbs_32 ) { /* DSA 1024 bits */
p = unused_limbs_32;
unused_limbs_32 = *p;
return p;
}
else if( nlimbs == 64 && unused_limbs_64 ) { /* DSA 2*1024 bits */
p = unused_limbs_64;
unused_limbs_64 = *p;
return p;
}
}
#endif
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#ifdef M_DEBUG
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p = secure? m_debug_alloc_secure(len, info):m_debug_alloc( len, info );
#else
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p = secure? m_alloc_secure( len ):m_alloc( len );
#endif
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return p;
}
void
#ifdef M_DEBUG
mpi_debug_free_limb_space( mpi_ptr_t a, const char *info )
#else
mpi_free_limb_space( mpi_ptr_t a )
#endif
{
if( !a )
return;
if( DBG_MEMORY )
log_debug("mpi_free_limb_space of size %lu\n", (ulong)m_size(a)*8 );
#if 0
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if( !m_is_secure(a) ) {
size_t nlimbs = m_size(a) / 4 ;
void *p = a;
if( nlimbs == 5 ) { /* DSA 160 bits */
*a = unused_limbs_5;
unused_limbs_5 = a;
return;
}
else if( nlimbs == 32 ) { /* DSA 1024 bits */
*a = unused_limbs_32;
unused_limbs_32 = a;
return;
}
else if( nlimbs == 64 ) { /* DSA 2*1024 bits */
*a = unused_limbs_64;
unused_limbs_64 = a;
return;
}
}
#endif
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m_free(a);
}
void
mpi_assign_limb_space( MPI a, mpi_ptr_t ap, unsigned nlimbs )
{
mpi_free_limb_space(a->d);
a->d = ap;
a->alloced = nlimbs;
}
/****************
* Resize the array of A to NLIMBS. the additional space is cleared
* (set to 0) [done by m_realloc()]
*/
void
#ifdef M_DEBUG
mpi_debug_resize( MPI a, unsigned nlimbs, const char *info )
#else
mpi_resize( MPI a, unsigned nlimbs )
#endif
{
if( nlimbs <= a->alloced )
return; /* no need to do it */
/* Note: a->secure is not used - instead the realloc functions
* take care of it. Maybe we should drop a->secure completely
* and rely on a mpi_is_secure function, which would be
* a wrapper around m_is_secure
*/
#ifdef M_DEBUG
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if( a->d )
a->d = m_debug_realloc(a->d, nlimbs * sizeof(mpi_limb_t), info );
else
a->d = m_debug_alloc_clear( nlimbs * sizeof(mpi_limb_t), info );
#else
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if( a->d )
a->d = m_realloc(a->d, nlimbs * sizeof(mpi_limb_t) );
else
a->d = m_alloc_clear( nlimbs * sizeof(mpi_limb_t) );
#endif
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a->alloced = nlimbs;
}
void
mpi_clear( MPI a )
{
a->nlimbs = 0;
a->nbits = 0;
a->flags = 0;
}
void
#ifdef M_DEBUG
mpi_debug_free( MPI a, const char *info )
#else
mpi_free( MPI a )
#endif
{
if( !a )
return;
if( DBG_MEMORY )
log_debug("mpi_free\n" );
if( a->flags & 4 )
m_free( a->d );
else {
#ifdef M_DEBUG
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mpi_debug_free_limb_space(a->d, info);
#else
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mpi_free_limb_space(a->d);
#endif
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}
if( a->flags & ~7 )
log_bug("invalid flag value in mpi\n");
m_free(a);
}
void
mpi_set_secure( MPI a )
{
mpi_ptr_t ap, bp;
if( (a->flags & 1) )
return;
a->flags |= 1;
ap = a->d;
if( !a->nlimbs ) {
assert(!ap);
return;
}
#ifdef M_DEBUG
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bp = mpi_debug_alloc_limb_space( a->nlimbs, 1, "set_secure" );
#else
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bp = mpi_alloc_limb_space( a->nlimbs, 1 );
#endif
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MPN_COPY( bp, ap, a->nlimbs );
a->d = bp;
#ifdef M_DEBUG
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mpi_debug_free_limb_space(ap, "set_secure");
#else
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mpi_free_limb_space(ap);
#endif
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}
MPI
mpi_set_opaque( MPI a, void *p, int len )
{
if( !a ) {
#ifdef M_DEBUG
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a = mpi_debug_alloc(0,"alloc_opaque");
#else
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a = mpi_alloc(0);
#endif
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}
if( a->flags & 4 )
m_free( a->d );
else {
#ifdef M_DEBUG
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mpi_debug_free_limb_space(a->d, "alloc_opaque");
#else
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mpi_free_limb_space(a->d);
#endif
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}
a->d = p;
a->alloced = 0;
a->nlimbs = 0;
a->nbits = len;
a->flags = 4;
return a;
}
void *
mpi_get_opaque( MPI a, int *len )
{
if( !(a->flags & 4) )
log_bug("mpi_get_opaque on normal mpi\n");
if( len )
*len = a->nbits;
return a->d;
}
/****************
* Note: This copy function should not interpret the MPI
* but copy it transparently.
*/
MPI
#ifdef M_DEBUG
mpi_debug_copy( MPI a, const char *info )
#else
mpi_copy( MPI a )
#endif
{
int i;
MPI b;
if( a && (a->flags & 4) ) {
void *p = m_is_secure(a->d)? m_alloc_secure( a->nbits )
: m_alloc( a->nbits );
memcpy( p, a->d, a->nbits );
b = mpi_set_opaque( NULL, p, a->nbits );
}
else if( a ) {
#ifdef M_DEBUG
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b = mpi_is_secure(a)? mpi_debug_alloc_secure( a->nlimbs, info )
: mpi_debug_alloc( a->nlimbs, info );
#else
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b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs )
: mpi_alloc( a->nlimbs );
#endif
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b->nlimbs = a->nlimbs;
b->sign = a->sign;
b->flags = a->flags;
b->nbits = a->nbits;
for(i=0; i < b->nlimbs; i++ )
b->d[i] = a->d[i];
}
else
b = NULL;
return b;
}
/****************
* This function allocates an MPI which is optimized to hold
* a value as large as the one given in the arhgument and allocates it
* with the same flags as A.
*/
MPI
#ifdef M_DEBUG
mpi_debug_alloc_like( MPI a, const char *info )
#else
mpi_alloc_like( MPI a )
#endif
{
MPI b;
if( a && (a->flags & 4) ) {
void *p = m_is_secure(a->d)? m_alloc_secure( a->nbits )
: m_alloc( a->nbits );
memcpy( p, a->d, a->nbits );
b = mpi_set_opaque( NULL, p, a->nbits );
}
else if( a ) {
#ifdef M_DEBUG
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b = mpi_is_secure(a)? mpi_debug_alloc_secure( a->nlimbs, info )
: mpi_debug_alloc( a->nlimbs, info );
#else
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b = mpi_is_secure(a)? mpi_alloc_secure( a->nlimbs )
: mpi_alloc( a->nlimbs );
#endif
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b->nlimbs = 0;
b->sign = 0;
b->flags = a->flags;
b->nbits = 0;
}
else
b = NULL;
return b;
}
void
mpi_set( MPI w, MPI u)
{
mpi_ptr_t wp, up;
mpi_size_t usize = u->nlimbs;
int usign = u->sign;
RESIZE_IF_NEEDED(w, usize);
wp = w->d;
up = u->d;
MPN_COPY( wp, up, usize );
w->nlimbs = usize;
w->nbits = u->nbits;
w->flags = u->flags;
w->sign = usign;
}
void
mpi_set_ui( MPI w, unsigned long u)
{
RESIZE_IF_NEEDED(w, 1);
w->d[0] = u;
w->nlimbs = u? 1:0;
w->sign = 0;
w->nbits = 0;
w->flags = 0;
}
MPI
mpi_alloc_set_ui( unsigned long u)
{
#ifdef M_DEBUG
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MPI w = mpi_debug_alloc(1,"alloc_set_ui");
#else
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MPI w = mpi_alloc(1);
#endif
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w->d[0] = u;
w->nlimbs = u? 1:0;
w->sign = 0;
return w;
}
void
mpi_swap( MPI a, MPI b)
{
struct gcry_mpi tmp;
tmp = *a; *a = *b; *b = tmp;
}