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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/* mpi.h - Multi Precision Integers3 * Copyright (C) 1994, 1996, 1998, 1999,4 * 2000, 2001 Free Software Foundation, Inc.5 *6 * This file is part of GNUPG.7 *8 * Note: This code is heavily based on the GNU MP Library.9 * Actually it's the same code with only minor changes in the10 * way the data is stored; this is to support the abstraction11 * of an optional secure memory allocation which may be used12 * to avoid revealing of sensitive data due to paging etc.13 * The GNU MP Library itself is published under the LGPL;14 * however I decided to publish this code under the plain GPL.15 */16 17#ifndef G10_MPI_H18#define G10_MPI_H19 20#include <linux/types.h>21#include <linux/scatterlist.h>22 23#define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)24#define BITS_PER_MPI_LIMB BITS_PER_LONG25 26typedef unsigned long int mpi_limb_t;27typedef signed long int mpi_limb_signed_t;28 29struct gcry_mpi {30 int alloced; /* array size (# of allocated limbs) */31 int nlimbs; /* number of valid limbs */32 int nbits; /* the real number of valid bits (info only) */33 int sign; /* indicates a negative number */34 unsigned flags; /* bit 0: array must be allocated in secure memory space */35 /* bit 1: not used */36 /* bit 2: the limb is a pointer to some m_alloced data */37 mpi_limb_t *d; /* array with the limbs */38};39 40typedef struct gcry_mpi *MPI;41 42#define mpi_get_nlimbs(a) ((a)->nlimbs)43 44/*-- mpiutil.c --*/45MPI mpi_alloc(unsigned nlimbs);46void mpi_free(MPI a);47int mpi_resize(MPI a, unsigned nlimbs);48 49MPI mpi_copy(MPI a);50 51/*-- mpicoder.c --*/52MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);53MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);54MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);55void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);56int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,57 int *sign);58int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,59 int *sign);60 61/*-- mpi-mod.c --*/62int mpi_mod(MPI rem, MPI dividend, MPI divisor);63 64/*-- mpi-pow.c --*/65int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);66 67/*-- mpi-cmp.c --*/68int mpi_cmp_ui(MPI u, ulong v);69int mpi_cmp(MPI u, MPI v);70 71/*-- mpi-sub-ui.c --*/72int mpi_sub_ui(MPI w, MPI u, unsigned long vval);73 74/*-- mpi-bit.c --*/75void mpi_normalize(MPI a);76unsigned mpi_get_nbits(MPI a);77int mpi_test_bit(MPI a, unsigned int n);78int mpi_set_bit(MPI a, unsigned int n);79int mpi_rshift(MPI x, MPI a, unsigned int n);80 81/*-- mpi-add.c --*/82int mpi_add(MPI w, MPI u, MPI v);83int mpi_sub(MPI w, MPI u, MPI v);84int mpi_addm(MPI w, MPI u, MPI v, MPI m);85int mpi_subm(MPI w, MPI u, MPI v, MPI m);86 87/*-- mpi-mul.c --*/88int mpi_mul(MPI w, MPI u, MPI v);89int mpi_mulm(MPI w, MPI u, MPI v, MPI m);90 91/*-- mpi-div.c --*/92int mpi_tdiv_r(MPI rem, MPI num, MPI den);93int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);94 95/* inline functions */96 97/**98 * mpi_get_size() - returns max size required to store the number99 *100 * @a: A multi precision integer for which we want to allocate a buffer101 *102 * Return: size required to store the number103 */104static inline unsigned int mpi_get_size(MPI a)105{106 return a->nlimbs * BYTES_PER_MPI_LIMB;107}108#endif /*G10_MPI_H */109