1 /* mpi.h - Multi Precision Integers 2 * Copyright (C) 1994, 1996, 1998, 1999, 3 * 2000, 2001 Free Software Foundation, Inc. 4 * 5 * This file is part of GNUPG. 6 * 7 * GNUPG is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * GNUPG is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 20 * 21 * Note: This code is heavily based on the GNU MP Library. 22 * Actually it's the same code with only minor changes in the 23 * way the data is stored; this is to support the abstraction 24 * of an optional secure memory allocation which may be used 25 * to avoid revealing of sensitive data due to paging etc. 26 * The GNU MP Library itself is published under the LGPL; 27 * however I decided to publish this code under the plain GPL. 28 */ 29 30 #ifndef G10_MPI_H 31 #define G10_MPI_H 32 33 #include <linux/types.h> 34 35 /* DSI defines */ 36 37 #define SHA1_DIGEST_LENGTH 20 38 39 /*end of DSI defines */ 40 41 #define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8) 42 #define BITS_PER_MPI_LIMB BITS_PER_LONG 43 44 typedef unsigned long int mpi_limb_t; 45 typedef signed long int mpi_limb_signed_t; 46 47 struct gcry_mpi { 48 int alloced; /* array size (# of allocated limbs) */ 49 int nlimbs; /* number of valid limbs */ 50 int nbits; /* the real number of valid bits (info only) */ 51 int sign; /* indicates a negative number */ 52 unsigned flags; /* bit 0: array must be allocated in secure memory space */ 53 /* bit 1: not used */ 54 /* bit 2: the limb is a pointer to some m_alloced data */ 55 mpi_limb_t *d; /* array with the limbs */ 56 }; 57 58 typedef struct gcry_mpi *MPI; 59 60 #define MPI_NULL NULL 61 62 #define mpi_get_nlimbs(a) ((a)->nlimbs) 63 #define mpi_is_neg(a) ((a)->sign) 64 65 /*-- mpiutil.c --*/ 66 MPI mpi_alloc(unsigned nlimbs); 67 MPI mpi_alloc_secure(unsigned nlimbs); 68 MPI mpi_alloc_like(MPI a); 69 void mpi_free(MPI a); 70 int mpi_resize(MPI a, unsigned nlimbs); 71 int mpi_copy(MPI *copy, const MPI a); 72 void mpi_clear(MPI a); 73 int mpi_set(MPI w, MPI u); 74 int mpi_set_ui(MPI w, ulong u); 75 MPI mpi_alloc_set_ui(unsigned long u); 76 void mpi_m_check(MPI a); 77 void mpi_swap(MPI a, MPI b); 78 79 /*-- mpicoder.c --*/ 80 MPI do_encode_md(const void *sha_buffer, unsigned nbits); 81 MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread); 82 int mpi_fromstr(MPI val, const char *str); 83 u32 mpi_get_keyid(MPI a, u32 *keyid); 84 void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign); 85 void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign); 86 int mpi_set_buffer(MPI a, const void *buffer, unsigned nbytes, int sign); 87 88 #define log_mpidump g10_log_mpidump 89 90 /*-- mpi-add.c --*/ 91 int mpi_add_ui(MPI w, MPI u, ulong v); 92 int mpi_add(MPI w, MPI u, MPI v); 93 int mpi_addm(MPI w, MPI u, MPI v, MPI m); 94 int mpi_sub_ui(MPI w, MPI u, ulong v); 95 int mpi_sub(MPI w, MPI u, MPI v); 96 int mpi_subm(MPI w, MPI u, MPI v, MPI m); 97 98 /*-- mpi-mul.c --*/ 99 int mpi_mul_ui(MPI w, MPI u, ulong v); 100 int mpi_mul_2exp(MPI w, MPI u, ulong cnt); 101 int mpi_mul(MPI w, MPI u, MPI v); 102 int mpi_mulm(MPI w, MPI u, MPI v, MPI m); 103 104 /*-- mpi-div.c --*/ 105 ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor); 106 int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor); 107 int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor); 108 int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor); 109 int mpi_tdiv_r(MPI rem, MPI num, MPI den); 110 int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den); 111 int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count); 112 int mpi_divisible_ui(const MPI dividend, ulong divisor); 113 114 /*-- mpi-gcd.c --*/ 115 int mpi_gcd(MPI g, const MPI a, const MPI b); 116 117 /*-- mpi-pow.c --*/ 118 int mpi_pow(MPI w, MPI u, MPI v); 119 int mpi_powm(MPI res, MPI base, MPI exp, MPI mod); 120 121 /*-- mpi-mpow.c --*/ 122 int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI mod); 123 124 /*-- mpi-cmp.c --*/ 125 int mpi_cmp_ui(MPI u, ulong v); 126 int mpi_cmp(MPI u, MPI v); 127 128 /*-- mpi-scan.c --*/ 129 int mpi_getbyte(MPI a, unsigned idx); 130 void mpi_putbyte(MPI a, unsigned idx, int value); 131 unsigned mpi_trailing_zeros(MPI a); 132 133 /*-- mpi-bit.c --*/ 134 void mpi_normalize(MPI a); 135 unsigned mpi_get_nbits(MPI a); 136 int mpi_test_bit(MPI a, unsigned n); 137 int mpi_set_bit(MPI a, unsigned n); 138 int mpi_set_highbit(MPI a, unsigned n); 139 void mpi_clear_highbit(MPI a, unsigned n); 140 void mpi_clear_bit(MPI a, unsigned n); 141 int mpi_rshift(MPI x, MPI a, unsigned n); 142 143 /*-- mpi-inv.c --*/ 144 int mpi_invm(MPI x, MPI u, MPI v); 145 146 #endif /*G10_MPI_H */ 147