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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - lib/mpi/mpi-bit.c
1 /* mpi-bit.c - MPI bit level fucntions
2 * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
21 #include "mpi-internal.h"
24 #define A_LIMB_1 ((mpi_limb_t) 1)
27 * Sometimes we have MSL (most significant limbs) which are 0;
28 * this is for some reasons not good, so this function removes them.
30 void mpi_normalize(MPI a
)
32 for (; a
->nlimbs
&& !a
->d
[a
->nlimbs
- 1]; a
->nlimbs
--)
37 * Return the number of bits in A.
39 unsigned mpi_get_nbits(MPI a
)
46 mpi_limb_t alimb
= a
->d
[a
->nlimbs
- 1];
48 n
= count_leading_zeros(alimb
);
50 n
= BITS_PER_MPI_LIMB
;
51 n
= BITS_PER_MPI_LIMB
- n
+ (a
->nlimbs
- 1) * BITS_PER_MPI_LIMB
;
56 EXPORT_SYMBOL_GPL(mpi_get_nbits
);