Edit File: mpi.h
/* 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> /* DSI defines */ #define SHA1_DIGEST_LENGTH 20 /*end of DSI defines */ #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_set_buffer(MPI a, const void *buffer, 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 */