/* mpi.h - Multi Precision Integers
* Copyright (C) 1994, 1996, 1998, 1999,
* 2000, 2001 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
*
* Note: This code is heavily based on the GNU MP Library.
* Actually it's the same code with only minor changes in the
* way the data is stored; this is to support the abstraction
* of an optional secure memory allocation which may be used
* to avoid revealing of sensitive data due to paging etc.
* The GNU MP Library itself is published under the LGPL;
* however I decided to publish this code under the plain GPL.
*/
#ifndef G10_MPI_H
#define G10_MPI_H
#include <linux/types.h>
#include <linux/scatterlist.h>
#define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)
#define BITS_PER_MPI_LIMB BITS_PER_LONG
typedef unsigned long int mpi_limb_t;
typedef signed long int mpi_limb_signed_t;
struct gcry_mpi {
int alloced; /* array size (# of allocated limbs) */
int nlimbs; /* number of valid limbs */
int nbits; /* the real number of valid bits (info only) */
int sign; /* indicates a negative number */
unsigned flags; /* bit 0: array must be allocated in secure memory space */
/* bit 1: not used */
/* bit 2: the limb is a pointer to some m_alloced data */
mpi_limb_t *d; /* array with the limbs */
};
typedef struct gcry_mpi *MPI;
#define mpi_get_nlimbs(a) ((a)->nlimbs)
#define mpi_is_neg(a) ((a)->sign)
/*-- mpiutil.c --*/
MPI mpi_alloc(unsigned nlimbs);
MPI mpi_alloc_secure(unsigned nlimbs);
MPI mpi_alloc_like(MPI a);
void mpi_free(MPI a);
int mpi_resize(MPI a, unsigned nlimbs);
int mpi_copy(MPI *copy, const MPI a);
void mpi_clear(MPI a);
int mpi_set(MPI w, MPI u);
int mpi_set_ui(MPI w, ulong u);
MPI mpi_alloc_set_ui(unsigned long u);
void mpi_m_check(MPI a);
void mpi_swap(MPI a, MPI b);
/*-- mpicoder.c --*/
MPI do_encode_md(const void *sha_buffer, unsigned nbits);
MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
int mpi_fromstr(MPI val, const char *str);
u32 mpi_get_keyid(MPI a, u32 *keyid);
void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
int *sign);
void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
int *sign);
#define log_mpidump g10_log_mpidump
/*-- mpi-add.c --*/
int mpi_add_ui(MPI w, MPI u, ulong v);
int mpi_add(MPI w, MPI u, MPI v);
int mpi_addm(MPI w, MPI u, MPI v, MPI m);
int mpi_sub_ui(MPI w, MPI u, ulong v);
int mpi_sub(MPI w, MPI u, MPI v);
int mpi_subm(MPI w, MPI u, MPI v, MPI m);
/*-- mpi-mul.c --*/
int mpi_mul_ui(MPI w, MPI u, ulong v);
int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
int mpi_mul(MPI w, MPI u, MPI v);
int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
/*-- mpi-div.c --*/
ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
int mpi_tdiv_r(MPI rem, MPI num, MPI den);
int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
int mpi_divisible_ui(const MPI dividend, ulong divisor);
/*-- mpi-gcd.c --*/
int mpi_gcd(MPI g, const MPI a, const MPI b);
/*-- mpi-pow.c --*/
int mpi_pow(MPI w, MPI u, MPI v);
int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
/*-- mpi-mpow.c --*/
int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI mod);
/*-- mpi-cmp.c --*/
int mpi_cmp_ui(MPI u, ulong v);
int mpi_cmp(MPI u, MPI v);
/*-- mpi-scan.c --*/
int mpi_getbyte(MPI a, unsigned idx);
void mpi_putbyte(MPI a, unsigned idx, int value);
unsigned mpi_trailing_zeros(MPI a);
/*-- mpi-bit.c --*/
void mpi_normalize(MPI a);
unsigned mpi_get_nbits(MPI a);
int mpi_test_bit(MPI a, unsigned n);
int mpi_set_bit(MPI a, unsigned n);
int mpi_set_highbit(MPI a, unsigned n);
void mpi_clear_highbit(MPI a, unsigned n);
void mpi_clear_bit(MPI a, unsigned n);
int mpi_rshift(MPI x, MPI a, unsigned n);
/*-- mpi-inv.c --*/
int mpi_invm(MPI x, MPI u, MPI v);
/* inline functions */
/**
* mpi_get_size() - returns max size required to store the number
*
* @a: A multi precision integer for which we want to allocate a bufer
*
* Return: size required to store the number
*/
static inline unsigned int mpi_get_size(MPI a)
{
return a->nlimbs * BYTES_PER_MPI_LIMB;
}
#endif /*G10_MPI_H */
