1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1
2 /* mpi-internal.h - Internal to the Multi Pr
3 * Copyright (C) 1994, 1996 Free Software
4 * Copyright (C) 1998, 2000 Free Software
5 *
6 * This file is part of GnuPG.
7 *
8 * Note: This code is heavily based on the GNU
9 * Actually it's the same code with only
10 * way the data is stored; this is to su
11 * of an optional secure memory allocati
12 * to avoid revealing of sensitive data
13 * The GNU MP Library itself is publishe
14 * however I decided to publish this cod
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 assert
34 } while (0);
35
36 /* If KARATSUBA_THRESHOLD is not already defin
37 * value which is good on most machines. */
38
39 /* tested 4, 16, 32 and 64, where 16 gave the
40 * checking a 768 and a 1024 bit ElGamal signa
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 s
47 #if KARATSUBA_THRESHOLD < 2
48 #undef KARATSUBA_THRESHOLD
49 #define KARATSUBA_THRESHOLD 2
50 #endif
51
52 typedef mpi_limb_t *mpi_ptr_t; /* pointer to
53 typedef int mpi_size_t; /* (must be a
54
55 static inline int RESIZE_IF_NEEDED(MPI a, unsi
56 {
57 if (a->alloced < b)
58 return mpi_resize(a, b);
59 return 0;
60 }
61
62 /* Copy N limbs from S to D. */
63 #define MPN_COPY(d, s, n) \
64 do {
65 mpi_size_t _i;
66 for (_i = 0; _i < (n); _i++)
67 (d)[_i] = (s)[_i];
68 } while (0)
69
70 #define MPN_COPY_DECR(d, s, n) \
71 do {
72 mpi_size_t _i;
73 for (_i = (n)-1; _i >= 0; _i--
74 (d)[_i] = (s)[_i];
75 } while (0)
76
77 /* Zero N limbs at D */
78 #define MPN_ZERO(d, n) \
79 do {
80 int _i;
81 for (_i = 0; _i < (n); _i++)
82 (d)[_i] = 0;
83 } while (0)
84
85 #define MPN_NORMALIZE(d, n) \
86 do {
87 while ((n) > 0) {
88 if ((d)[(n)-1])
89 break;
90 (n)--;
91 }
92 } while (0)
93
94 #define MPN_MUL_N_RECURSE(prodp, up, vp, size,
95 do {
96 if ((size) < KARATSUBA_THRESHO
97 mul_n_basecase(prodp,
98 else
99 mul_n(prodp, up, vp, s
100 } while (0);
101
102 /* Divide the two-limb number in (NH,,NL) by D
103 * limb not larger than (2**(2*BITS_PER_MP_LIM
104 * If this would yield overflow, DI should be
105 * (i.e., only ones). For correct operation,
106 * has to be set. Put the quotient in Q and t
107 */
108 #define UDIV_QRNND_PREINV(q, r, nh, nl, d, di)
109 do {
110 mpi_limb_t _ql __maybe_unused;
111 mpi_limb_t _q, _r;
112 mpi_limb_t _xh, _xl;
113 umul_ppmm(_q, _ql, (nh), (di))
114 _q += (nh); /* DI is 2**BI
115 umul_ppmm(_xh, _xl, _q, (d));
116 sub_ddmmss(_xh, _r, (nh), (nl)
117 if (_xh) {
118 sub_ddmmss(_xh, _r, _x
119 _q++;
120 if (_xh) {
121 sub_ddmmss(_xh
122 _q++;
123 }
124 }
125 if (_r >= (d)) {
126 _r -= (d);
127 _q++;
128 }
129 (r) = _r;
130 (q) = _q;
131 } while (0)
132
133
134 /*-- mpiutil.c --*/
135 mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs
136 void mpi_free_limb_space(mpi_ptr_t a);
137 void mpi_assign_limb_space(MPI a, mpi_ptr_t ap
138
139 static inline mpi_limb_t mpihelp_add_1(mpi_ptr
140 mpi_size_t s1_size, m
141 mpi_limb_t mpihelp_add_n(mpi_ptr_t res_ptr, mp
142 mpi_ptr_t s2_ptr, mpi
143 static inline mpi_limb_t mpihelp_add(mpi_ptr_t
144 mpi_ptr_t s2_ptr, mpi_s
145
146 static inline mpi_limb_t mpihelp_sub_1(mpi_ptr
147 mpi_size_t s1_size, m
148 mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mp
149 mpi_ptr_t s2_ptr, mpi
150 static inline mpi_limb_t mpihelp_sub(mpi_ptr_t
151 mpi_ptr_t s2_ptr, mpi_s
152
153 /*-- mpih-cmp.c --*/
154 int mpihelp_cmp(mpi_ptr_t op1_ptr, mpi_ptr_t o
155
156 /*-- mpih-mul.c --*/
157
158 struct karatsuba_ctx {
159 struct karatsuba_ctx *next;
160 mpi_ptr_t tspace;
161 mpi_size_t tspace_size;
162 mpi_ptr_t tp;
163 mpi_size_t tp_size;
164 };
165
166 void mpihelp_release_karatsuba_ctx(struct kara
167
168 mpi_limb_t mpihelp_addmul_1(mpi_ptr_t res_ptr,
169 mpi_size_t s1_size
170 mpi_limb_t mpihelp_submul_1(mpi_ptr_t res_ptr,
171 mpi_size_t s1_size
172 int mpihelp_mul(mpi_ptr_t prodp, mpi_ptr_t up,
173 mpi_ptr_t vp, mpi_size_t vsize
174 void mpih_sqr_n_basecase(mpi_ptr_t prodp, mpi_
175 void mpih_sqr_n(mpi_ptr_t prodp, mpi_ptr_t up,
176 mpi_ptr_t tspace);
177
178 int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp
179 mpi_ptr_t up, m
180 mpi_ptr_t vp, m
181 struct karatsub
182
183 /*-- generic_mpih-mul1.c --*/
184 mpi_limb_t mpihelp_mul_1(mpi_ptr_t res_ptr, mp
185 mpi_size_t s1_size, m
186
187 /*-- mpih-div.c --*/
188 mpi_limb_t mpihelp_mod_1(mpi_ptr_t dividend_pt
189 mpi_limb_t divisor_li
190 mpi_limb_t mpihelp_divrem(mpi_ptr_t qp, mpi_si
191 mpi_ptr_t np, mpi_si
192 mpi_ptr_t dp, mpi_si
193 mpi_limb_t mpihelp_divmod_1(mpi_ptr_t quot_ptr
194 mpi_ptr_t dividend
195 mpi_limb_t divisor
196
197 /*-- generic_mpih-[lr]shift.c --*/
198 mpi_limb_t mpihelp_lshift(mpi_ptr_t wp, mpi_pt
199 unsigned cnt);
200 mpi_limb_t mpihelp_rshift(mpi_ptr_t wp, mpi_pt
201 unsigned cnt);
202
203 /* Define stuff for longlong.h. */
204 #define W_TYPE_SIZE BITS_PER_MPI_LIMB
205 typedef mpi_limb_t UWtype;
206 typedef unsigned int UHWtype;
207 #if defined(__GNUC__)
208 typedef unsigned int UQItype __attribute__ ((m
209 typedef int SItype __attribute__ ((mode(SI)));
210 typedef unsigned int USItype __attribute__ ((m
211 typedef int DItype __attribute__ ((mode(DI)));
212 typedef unsigned int UDItype __attribute__ ((m
213 #else
214 typedef unsigned char UQItype;
215 typedef long SItype;
216 typedef unsigned long USItype;
217 #endif
218
219 #ifdef __GNUC__
220 #include "mpi-inline.h"
221 #endif
222
223 #endif /*G10_MPI_INTERNAL_H */
224
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