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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* mpi-internal.h - Internal to the Multi Precision Integers
3 * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
4 * Copyright (C) 1998, 2000 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 the
10 * way the data is stored; this is to support the abstraction
11 * of an optional secure memory allocation which may be used
12 * 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_INTERNAL_H
18#define G10_MPI_INTERNAL_H
19
20#include <linux/module.h>
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/string.h>
24#include <linux/mpi.h>
25#include <linux/errno.h>
26
27#define log_debug printk
28#define log_bug printk
29
30#define assert(x) \
31 do { \
32 if (!x) \
33 log_bug("failed assertion\n"); \
34 } while (0);
35
36/* If KARATSUBA_THRESHOLD is not already defined, define it to a
37 * value which is good on most machines. */
38
39/* tested 4, 16, 32 and 64, where 16 gave the best performance when
40 * checking a 768 and a 1024 bit ElGamal signature.
41 * (wk 22.12.97) */
42#ifndef KARATSUBA_THRESHOLD
43#define KARATSUBA_THRESHOLD 16
44#endif
45
46/* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
47#if KARATSUBA_THRESHOLD < 2
48#undef KARATSUBA_THRESHOLD
49#define KARATSUBA_THRESHOLD 2
50#endif
51
52typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
53typedef int mpi_size_t; /* (must be a signed type) */
54
55/* Copy N limbs from S to D. */
56#define MPN_COPY(d, s, n) \
57 do { \
58 mpi_size_t _i; \
59 for (_i = 0; _i < (n); _i++) \
60 (d)[_i] = (s)[_i]; \
61 } while (0)
62
63#define MPN_COPY_DECR(d, s, n) \
64 do { \
65 mpi_size_t _i; \
66 for (_i = (n)-1; _i >= 0; _i--) \
67 (d)[_i] = (s)[_i]; \
68 } while (0)
69
70/* Zero N limbs at D */
71#define MPN_ZERO(d, n) \
72 do { \
73 int _i; \
74 for (_i = 0; _i < (n); _i++) \
75 (d)[_i] = 0; \
76 } while (0)
77
78#define MPN_NORMALIZE(d, n) \
79 do { \
80 while ((n) > 0) { \
81 if ((d)[(n)-1]) \
82 break; \
83 (n)--; \
84 } \
85 } while (0)
86
87#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
88 do { \
89 if ((size) < KARATSUBA_THRESHOLD) \
90 mul_n_basecase(prodp, up, vp, size); \
91 else \
92 mul_n(prodp, up, vp, size, tspace); \
93 } while (0);
94
95/*-- mpiutil.c --*/
96mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs);
97void mpi_free_limb_space(mpi_ptr_t a);
98void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs);
99
100static inline mpi_limb_t mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
101 mpi_size_t s1_size, mpi_limb_t s2_limb);
102mpi_limb_t mpihelp_add_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
103 mpi_ptr_t s2_ptr, mpi_size_t size);
104static inline mpi_limb_t mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
105 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
106
107static inline mpi_limb_t mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
108 mpi_size_t s1_size, mpi_limb_t s2_limb);
109mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
110 mpi_ptr_t s2_ptr, mpi_size_t size);
111static inline mpi_limb_t mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
112 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
113
114/*-- mpih-cmp.c --*/
115int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size);
116
117/*-- mpih-mul.c --*/
118
119struct karatsuba_ctx {
120 struct karatsuba_ctx *next;
121 mpi_ptr_t tspace;
122 mpi_size_t tspace_size;
123 mpi_ptr_t tp;
124 mpi_size_t tp_size;
125};
126
127void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx *ctx);
128
129mpi_limb_t mpihelp_addmul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
130 mpi_size_t s1_size, mpi_limb_t s2_limb);
131mpi_limb_t mpihelp_submul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
132 mpi_size_t s1_size, mpi_limb_t s2_limb);
133int mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
134 mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result);
135void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size);
136void mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
137 mpi_ptr_t tspace);
138
139int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp,
140 mpi_ptr_t up, mpi_size_t usize,
141 mpi_ptr_t vp, mpi_size_t vsize,
142 struct karatsuba_ctx *ctx);
143
144/*-- generic_mpih-mul1.c --*/
145mpi_limb_t mpihelp_mul_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
146 mpi_size_t s1_size, mpi_limb_t s2_limb);
147
148/*-- mpih-div.c --*/
149mpi_limb_t mpihelp_divrem(mpi_ptr_t qp, mpi_size_t qextra_limbs,
150 mpi_ptr_t np, mpi_size_t nsize,
151 mpi_ptr_t dp, mpi_size_t dsize);
152
153/*-- generic_mpih-[lr]shift.c --*/
154mpi_limb_t mpihelp_lshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
155 unsigned cnt);
156mpi_limb_t mpihelp_rshift(mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
157 unsigned cnt);
158
159/* Define stuff for longlong.h. */
160#define W_TYPE_SIZE BITS_PER_MPI_LIMB
161typedef mpi_limb_t UWtype;
162typedef unsigned int UHWtype;
163#if defined(__GNUC__)
164typedef unsigned int UQItype __attribute__ ((mode(QI)));
165typedef int SItype __attribute__ ((mode(SI)));
166typedef unsigned int USItype __attribute__ ((mode(SI)));
167typedef int DItype __attribute__ ((mode(DI)));
168typedef unsigned int UDItype __attribute__ ((mode(DI)));
169#else
170typedef unsigned char UQItype;
171typedef long SItype;
172typedef unsigned long USItype;
173#endif
174
175#ifdef __GNUC__
176#include "mpi-inline.h"
177#endif
178
179#endif /*G10_MPI_INTERNAL_H */