2011-08-31 05:05:16 -06:00
|
|
|
/* 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 "mpi-internal.h"
|
|
|
|
|
|
|
|
/****************
|
|
|
|
* 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 mpi_alloc(unsigned nlimbs)
|
|
|
|
{
|
|
|
|
MPI a;
|
|
|
|
|
|
|
|
a = kmalloc(sizeof *a, GFP_KERNEL);
|
|
|
|
if (!a)
|
|
|
|
return a;
|
|
|
|
|
|
|
|
if (nlimbs) {
|
|
|
|
a->d = mpi_alloc_limb_space(nlimbs);
|
|
|
|
if (!a->d) {
|
|
|
|
kfree(a);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
a->d = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
a->alloced = nlimbs;
|
|
|
|
a->nlimbs = 0;
|
|
|
|
a->sign = 0;
|
|
|
|
a->flags = 0;
|
|
|
|
a->nbits = 0;
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mpi_alloc);
|
|
|
|
|
|
|
|
mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
|
|
|
|
{
|
|
|
|
size_t len = nlimbs * sizeof(mpi_limb_t);
|
|
|
|
|
2012-01-26 10:13:19 -07:00
|
|
|
if (!len)
|
|
|
|
return NULL;
|
|
|
|
|
2011-08-31 05:05:16 -06:00
|
|
|
return kmalloc(len, GFP_KERNEL);
|
|
|
|
}
|
|
|
|
|
|
|
|
void mpi_free_limb_space(mpi_ptr_t a)
|
|
|
|
{
|
|
|
|
if (!a)
|
|
|
|
return;
|
|
|
|
|
|
|
|
kfree(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()]
|
|
|
|
*/
|
|
|
|
int mpi_resize(MPI a, unsigned nlimbs)
|
|
|
|
{
|
|
|
|
void *p;
|
|
|
|
|
|
|
|
if (nlimbs <= a->alloced)
|
|
|
|
return 0; /* no need to do it */
|
|
|
|
|
|
|
|
if (a->d) {
|
|
|
|
p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
|
|
|
|
if (!p)
|
|
|
|
return -ENOMEM;
|
|
|
|
memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
|
|
|
|
kfree(a->d);
|
|
|
|
a->d = p;
|
|
|
|
} else {
|
|
|
|
a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
|
|
|
|
if (!a->d)
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
a->alloced = nlimbs;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void mpi_clear(MPI a)
|
|
|
|
{
|
|
|
|
a->nlimbs = 0;
|
|
|
|
a->nbits = 0;
|
|
|
|
a->flags = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void mpi_free(MPI a)
|
|
|
|
{
|
|
|
|
if (!a)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (a->flags & 4)
|
|
|
|
kfree(a->d);
|
|
|
|
else
|
|
|
|
mpi_free_limb_space(a->d);
|
|
|
|
|
|
|
|
if (a->flags & ~7)
|
|
|
|
pr_info("invalid flag value in mpi\n");
|
|
|
|
kfree(a);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(mpi_free);
|
|
|
|
|
|
|
|
/****************
|
|
|
|
* Note: This copy function should not interpret the MPI
|
|
|
|
* but copy it transparently.
|
|
|
|
*/
|
|
|
|
int mpi_copy(MPI *copied, const MPI a)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
MPI b;
|
|
|
|
|
2012-01-26 10:13:16 -07:00
|
|
|
*copied = NULL;
|
2011-08-31 05:05:16 -06:00
|
|
|
|
|
|
|
if (a) {
|
|
|
|
b = mpi_alloc(a->nlimbs);
|
|
|
|
if (!b)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
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];
|
|
|
|
|
|
|
|
*copied = b;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int mpi_set(MPI w, const MPI u)
|
|
|
|
{
|
|
|
|
mpi_ptr_t wp, up;
|
|
|
|
mpi_size_t usize = u->nlimbs;
|
|
|
|
int usign = u->sign;
|
|
|
|
|
|
|
|
if (RESIZE_IF_NEEDED(w, (size_t) usize) < 0)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
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;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int mpi_set_ui(MPI w, unsigned long u)
|
|
|
|
{
|
|
|
|
if (RESIZE_IF_NEEDED(w, 1) < 0)
|
|
|
|
return -ENOMEM;
|
|
|
|
w->d[0] = u;
|
|
|
|
w->nlimbs = u ? 1 : 0;
|
|
|
|
w->sign = 0;
|
|
|
|
w->nbits = 0;
|
|
|
|
w->flags = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
MPI mpi_alloc_set_ui(unsigned long u)
|
|
|
|
{
|
|
|
|
MPI w = mpi_alloc(1);
|
|
|
|
if (!w)
|
|
|
|
return w;
|
|
|
|
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;
|
|
|
|
}
|