linux/lib/crypto/mpi/mpiutil.c

/* 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"

/* Constants allocated right away at startup.  */
static MPI constants[MPI_NUMBER_OF_CONSTANTS];

/* Initialize the MPI subsystem.  This is called early and allows to
 * do some initialization without taking care of threading issues.
 */
static int __init mpi_init(void)
{ … }
postcore_initcall(mpi_init);

/* Return a constant MPI descripbed by NO which is one of the
 * MPI_C_xxx macros.  There is no need to copy this returned value; it
 * may be used directly.
 */
MPI mpi_const(enum gcry_mpi_constants no)
{ … }
EXPORT_SYMBOL_GPL(…);

/****************
 * 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 change this to bits (or bytes).
 *
 *	  But mpi_alloc is used in a lot of places :-)
 */
MPI mpi_alloc(unsigned nlimbs)
{ … }
EXPORT_SYMBOL_GPL(…);

mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
{ … }

void mpi_free_limb_space(mpi_ptr_t a)
{ … }

void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned 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 mpi_clear(MPI a)
{ … }
EXPORT_SYMBOL_GPL(…);

void mpi_free(MPI a)
{ … }
EXPORT_SYMBOL_GPL(…);

/****************
 * Note: This copy function should not interpret the MPI
 *	 but copy it transparently.
 */
MPI mpi_copy(MPI a)
{ … }

/****************
 * This function allocates an MPI which is optimized to hold
 * a value as large as the one given in the argument and allocates it
 * with the same flags as A.
 */
MPI mpi_alloc_like(MPI a)
{ … }


/* Set U into W and release U.  If W is NULL only U will be released. */
void mpi_snatch(MPI w, MPI u)
{ … }


MPI mpi_set(MPI w, MPI u)
{ … }
EXPORT_SYMBOL_GPL(…);

MPI mpi_set_ui(MPI w, unsigned long u)
{ … }
EXPORT_SYMBOL_GPL(…);

MPI mpi_alloc_set_ui(unsigned long u)
{ … }

/****************
 * Swap the value of A and B, when SWAP is 1.
 * Leave the value when SWAP is 0.
 * This implementation should be constant-time regardless of SWAP.
 */
void mpi_swap_cond(MPI a, MPI b, unsigned long swap)
{ … }

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;