97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* mpi.h - Multi Precision Integers
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* Copyright (C) 1994, 1996, 1998, 1999,
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* 2000, 2001 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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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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#ifndef G10_MPI_H
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#define G10_MPI_H
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)
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#define BITS_PER_MPI_LIMB BITS_PER_LONG
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typedef unsigned long int mpi_limb_t;
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typedef signed long int mpi_limb_signed_t;
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struct gcry_mpi {
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int alloced; /* array size (# of allocated limbs) */
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int nlimbs; /* number of valid limbs */
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int nbits; /* the real number of valid bits (info only) */
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int sign; /* indicates a negative number */
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unsigned flags; /* bit 0: array must be allocated in secure memory space */
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/* bit 1: not used */
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/* bit 2: the limb is a pointer to some m_alloced data */
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mpi_limb_t *d; /* array with the limbs */
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};
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typedef struct gcry_mpi *MPI;
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#define mpi_get_nlimbs(a) ((a)->nlimbs)
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/*-- mpiutil.c --*/
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MPI mpi_alloc(unsigned nlimbs);
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void mpi_free(MPI a);
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int mpi_resize(MPI a, unsigned nlimbs);
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/*-- mpicoder.c --*/
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MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
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MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
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MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
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void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
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int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
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int *sign);
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int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
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int *sign);
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/*-- mpi-pow.c --*/
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int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
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/*-- mpi-cmp.c --*/
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int mpi_cmp_ui(MPI u, ulong v);
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int mpi_cmp(MPI u, MPI v);
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/*-- mpi-bit.c --*/
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void mpi_normalize(MPI a);
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unsigned mpi_get_nbits(MPI a);
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/* inline functions */
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/**
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* mpi_get_size() - returns max size required to store the number
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*
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* @a: A multi precision integer for which we want to allocate a bufer
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*
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* Return: size required to store the number
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*/
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static inline unsigned int mpi_get_size(MPI a)
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{
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return a->nlimbs * BYTES_PER_MPI_LIMB;
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}
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#endif /*G10_MPI_H */
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