158 lines
5.2 KiB
C
158 lines
5.2 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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#define mpi_is_neg(a) ((a)->sign)
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/*-- mpiutil.c --*/
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MPI mpi_alloc(unsigned nlimbs);
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MPI mpi_alloc_secure(unsigned nlimbs);
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MPI mpi_alloc_like(MPI a);
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void mpi_free(MPI a);
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int mpi_resize(MPI a, unsigned nlimbs);
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int mpi_copy(MPI *copy, const MPI a);
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void mpi_clear(MPI a);
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int mpi_set(MPI w, MPI u);
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int mpi_set_ui(MPI w, ulong u);
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MPI mpi_alloc_set_ui(unsigned long u);
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void mpi_m_check(MPI a);
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void mpi_swap(MPI a, MPI b);
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/*-- mpicoder.c --*/
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MPI do_encode_md(const void *sha_buffer, unsigned nbits);
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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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int mpi_fromstr(MPI val, const char *str);
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u32 mpi_get_keyid(MPI a, u32 *keyid);
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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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void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, 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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#define log_mpidump g10_log_mpidump
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/*-- mpi-add.c --*/
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int mpi_add_ui(MPI w, MPI u, ulong v);
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int mpi_add(MPI w, MPI u, MPI v);
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int mpi_addm(MPI w, MPI u, MPI v, MPI m);
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int mpi_sub_ui(MPI w, MPI u, ulong v);
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int mpi_sub(MPI w, MPI u, MPI v);
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int mpi_subm(MPI w, MPI u, MPI v, MPI m);
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/*-- mpi-mul.c --*/
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int mpi_mul_ui(MPI w, MPI u, ulong v);
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int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
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int mpi_mul(MPI w, MPI u, MPI v);
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int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
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/*-- mpi-div.c --*/
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ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
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int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
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int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
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int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
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int mpi_tdiv_r(MPI rem, MPI num, MPI den);
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int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
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int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
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int mpi_divisible_ui(const MPI dividend, ulong divisor);
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/*-- mpi-gcd.c --*/
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int mpi_gcd(MPI g, const MPI a, const MPI b);
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/*-- mpi-pow.c --*/
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int mpi_pow(MPI w, MPI u, MPI v);
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int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
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/*-- mpi-mpow.c --*/
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int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, 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-scan.c --*/
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int mpi_getbyte(MPI a, unsigned idx);
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void mpi_putbyte(MPI a, unsigned idx, int value);
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unsigned mpi_trailing_zeros(MPI a);
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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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int mpi_test_bit(MPI a, unsigned n);
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int mpi_set_bit(MPI a, unsigned n);
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int mpi_set_highbit(MPI a, unsigned n);
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void mpi_clear_highbit(MPI a, unsigned n);
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void mpi_clear_bit(MPI a, unsigned n);
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int mpi_rshift(MPI x, MPI a, unsigned n);
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/*-- mpi-inv.c --*/
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int mpi_invm(MPI x, MPI u, MPI v);
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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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