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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 #include <linux/scatterlist.h>
35
36 #define BYTES_PER_MPI_LIMB (BITS_PER_LONG / 8)
37 #define BITS_PER_MPI_LIMB BITS_PER_LONG
38
39 typedef unsigned long int mpi_limb_t;
40 typedef signed long int mpi_limb_signed_t;
41
42 struct gcry_mpi {
43 int alloced; /* array size (# of allocated limbs) */
44 int nlimbs; /* number of valid limbs */
45 int nbits; /* the real number of valid bits (info only) */
46 int sign; /* indicates a negative number */
47 unsigned flags; /* bit 0: array must be allocated in secure memory space */
48 /* bit 1: not used */
49 /* bit 2: the limb is a pointer to some m_alloced data */
50 mpi_limb_t *d; /* array with the limbs */
51 };
52
53 typedef struct gcry_mpi *MPI;
54
55 #define mpi_get_nlimbs(a) ((a)->nlimbs)
56 #define mpi_is_neg(a) ((a)->sign)
57
58 /*-- mpiutil.c --*/
59 MPI mpi_alloc(unsigned nlimbs);
60 MPI mpi_alloc_secure(unsigned nlimbs);
61 MPI mpi_alloc_like(MPI a);
62 void mpi_free(MPI a);
63 int mpi_resize(MPI a, unsigned nlimbs);
64 int mpi_copy(MPI *copy, const MPI a);
65 void mpi_clear(MPI a);
66 int mpi_set(MPI w, MPI u);
67 int mpi_set_ui(MPI w, ulong u);
68 MPI mpi_alloc_set_ui(unsigned long u);
69 void mpi_m_check(MPI a);
70 void mpi_swap(MPI a, MPI b);
71
72 /*-- mpicoder.c --*/
73 MPI do_encode_md(const void *sha_buffer, unsigned nbits);
74 MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
75 MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
76 MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len);
77 int mpi_fromstr(MPI val, const char *str);
78 u32 mpi_get_keyid(MPI a, u32 *keyid);
79 void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
80 int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
81 int *sign);
82 void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
83 int mpi_write_to_sgl(MPI a, struct scatterlist *sg, unsigned nbytes,
84 int *sign);
85
86 #define log_mpidump g10_log_mpidump
87
88 /*-- mpi-add.c --*/
89 int mpi_add_ui(MPI w, MPI u, ulong v);
90 int mpi_add(MPI w, MPI u, MPI v);
91 int mpi_addm(MPI w, MPI u, MPI v, MPI m);
92 int mpi_sub_ui(MPI w, MPI u, ulong v);
93 int mpi_sub(MPI w, MPI u, MPI v);
94 int mpi_subm(MPI w, MPI u, MPI v, MPI m);
95
96 /*-- mpi-mul.c --*/
97 int mpi_mul_ui(MPI w, MPI u, ulong v);
98 int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
99 int mpi_mul(MPI w, MPI u, MPI v);
100 int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
101
102 /*-- mpi-div.c --*/
103 ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
104 int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
105 int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
106 int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
107 int mpi_tdiv_r(MPI rem, MPI num, MPI den);
108 int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
109 int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
110 int mpi_divisible_ui(const MPI dividend, ulong divisor);
111
112 /*-- mpi-gcd.c --*/
113 int mpi_gcd(MPI g, const MPI a, const MPI b);
114
115 /*-- mpi-pow.c --*/
116 int mpi_pow(MPI w, MPI u, MPI v);
117 int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
118
119 /*-- mpi-mpow.c --*/
120 int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI mod);
121
122 /*-- mpi-cmp.c --*/
123 int mpi_cmp_ui(MPI u, ulong v);
124 int mpi_cmp(MPI u, MPI v);
125
126 /*-- mpi-scan.c --*/
127 int mpi_getbyte(MPI a, unsigned idx);
128 void mpi_putbyte(MPI a, unsigned idx, int value);
129 unsigned mpi_trailing_zeros(MPI a);
130
131 /*-- mpi-bit.c --*/
132 void mpi_normalize(MPI a);
133 unsigned mpi_get_nbits(MPI a);
134 int mpi_test_bit(MPI a, unsigned n);
135 int mpi_set_bit(MPI a, unsigned n);
136 int mpi_set_highbit(MPI a, unsigned n);
137 void mpi_clear_highbit(MPI a, unsigned n);
138 void mpi_clear_bit(MPI a, unsigned n);
139 int mpi_rshift(MPI x, MPI a, unsigned n);
140
141 /*-- mpi-inv.c --*/
142 int mpi_invm(MPI x, MPI u, MPI v);
143
144 /* inline functions */
145
146 /**
147 * mpi_get_size() - returns max size required to store the number
148 *
149 * @a: A multi precision integer for which we want to allocate a bufer
150 *
151 * Return: size required to store the number
152 */
153 static inline unsigned int mpi_get_size(MPI a)
154 {
155 return a->nlimbs * BYTES_PER_MPI_LIMB;
156 }
157 #endif /*G10_MPI_H */