d37e296979
Added a mpi_read_buf() helper function to export MPI to a buf provided by the user, and a mpi_get_size() helper, that tells the user how big the buf is. Changed mpi_free to use kzfree instead of kfree because it is used to free crypto keys. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/* mpiutil.ac - Utility functions for MPI
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* Copyright (C) 1998, 1999 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 "mpi-internal.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 mpi_alloc(unsigned nlimbs)
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{
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MPI a;
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a = kmalloc(sizeof *a, GFP_KERNEL);
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if (!a)
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return a;
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if (nlimbs) {
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a->d = mpi_alloc_limb_space(nlimbs);
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if (!a->d) {
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kfree(a);
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return NULL;
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}
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} else {
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a->d = NULL;
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}
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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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a->nbits = 0;
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return a;
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}
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EXPORT_SYMBOL_GPL(mpi_alloc);
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mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
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{
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size_t len = nlimbs * sizeof(mpi_limb_t);
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if (!len)
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return NULL;
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return kmalloc(len, GFP_KERNEL);
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}
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void 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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kzfree(a);
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}
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void 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 m_realloc()]
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*/
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int mpi_resize(MPI a, unsigned nlimbs)
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{
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void *p;
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if (nlimbs <= a->alloced)
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return 0; /* no need to do it */
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if (a->d) {
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p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
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kzfree(a->d);
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a->d = p;
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} else {
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a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
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if (!a->d)
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return -ENOMEM;
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}
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a->alloced = nlimbs;
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return 0;
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}
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void 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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kzfree(a->d);
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else
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mpi_free_limb_space(a->d);
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if (a->flags & ~7)
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pr_info("invalid flag value in mpi\n");
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kfree(a);
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}
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EXPORT_SYMBOL_GPL(mpi_free);
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MODULE_DESCRIPTION("Multiprecision maths library");
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MODULE_LICENSE("GPL");
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