1 | /* wolfmath.c
|
---|
2 | *
|
---|
3 | * Copyright (C) 2006-2017 wolfSSL Inc.
|
---|
4 | *
|
---|
5 | * This file is part of wolfSSL.
|
---|
6 | *
|
---|
7 | * wolfSSL 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 | * wolfSSL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
|
---|
20 | */
|
---|
21 |
|
---|
22 |
|
---|
23 | /* common functions for either math library */
|
---|
24 |
|
---|
25 | #ifdef HAVE_CONFIG_H
|
---|
26 | #include <config.h>
|
---|
27 | #endif
|
---|
28 |
|
---|
29 | /* in case user set USE_FAST_MATH there */
|
---|
30 | #include <wolfssl/wolfcrypt/settings.h>
|
---|
31 |
|
---|
32 | #ifdef USE_FAST_MATH
|
---|
33 | #include <wolfssl/wolfcrypt/tfm.h>
|
---|
34 | #else
|
---|
35 | #include <wolfssl/wolfcrypt/integer.h>
|
---|
36 | #endif
|
---|
37 |
|
---|
38 | #include <wolfssl/wolfcrypt/error-crypt.h>
|
---|
39 | #include <wolfssl/wolfcrypt/logging.h>
|
---|
40 |
|
---|
41 | #if defined(USE_FAST_MATH) || !defined(NO_BIG_INT)
|
---|
42 |
|
---|
43 | #ifdef WOLFSSL_ASYNC_CRYPT
|
---|
44 | #include <wolfssl/wolfcrypt/async.h>
|
---|
45 | #endif
|
---|
46 |
|
---|
47 | #ifdef NO_INLINE
|
---|
48 | #include <wolfssl/wolfcrypt/misc.h>
|
---|
49 | #else
|
---|
50 | #define WOLFSSL_MISC_INCLUDED
|
---|
51 | #include <wolfcrypt/src/misc.c>
|
---|
52 | #endif
|
---|
53 |
|
---|
54 |
|
---|
55 | #if !defined(WC_NO_CACHE_RESISTANT) && \
|
---|
56 | ((defined(HAVE_ECC) && defined(ECC_TIMING_RESISTANT)) || \
|
---|
57 | (defined(USE_FAST_MATH) && defined(TFM_TIMING_RESISTANT)))
|
---|
58 |
|
---|
59 | /* all off / all on pointer addresses for constant calculations */
|
---|
60 | /* ecc.c uses same table */
|
---|
61 | const wolfssl_word wc_off_on_addr[2] =
|
---|
62 | {
|
---|
63 | #if defined(WC_64BIT_CPU)
|
---|
64 | W64LIT(0x0000000000000000),
|
---|
65 | W64LIT(0xffffffffffffffff)
|
---|
66 | #elif defined(WC_16BIT_CPU)
|
---|
67 | 0x0000U,
|
---|
68 | 0xffffU
|
---|
69 | #else
|
---|
70 | /* 32 bit */
|
---|
71 | 0x00000000U,
|
---|
72 | 0xffffffffU
|
---|
73 | #endif
|
---|
74 | };
|
---|
75 | #endif
|
---|
76 |
|
---|
77 |
|
---|
78 | int get_digit_count(mp_int* a)
|
---|
79 | {
|
---|
80 | if (a == NULL)
|
---|
81 | return 0;
|
---|
82 |
|
---|
83 | return a->used;
|
---|
84 | }
|
---|
85 |
|
---|
86 | mp_digit get_digit(mp_int* a, int n)
|
---|
87 | {
|
---|
88 | if (a == NULL)
|
---|
89 | return 0;
|
---|
90 |
|
---|
91 | return (n >= a->used || n < 0) ? 0 : a->dp[n];
|
---|
92 | }
|
---|
93 |
|
---|
94 | int get_rand_digit(WC_RNG* rng, mp_digit* d)
|
---|
95 | {
|
---|
96 | return wc_RNG_GenerateBlock(rng, (byte*)d, sizeof(mp_digit));
|
---|
97 | }
|
---|
98 |
|
---|
99 | #ifdef WC_RSA_BLINDING
|
---|
100 | int mp_rand(mp_int* a, int digits, WC_RNG* rng)
|
---|
101 | {
|
---|
102 | int ret;
|
---|
103 | mp_digit d;
|
---|
104 |
|
---|
105 | if (rng == NULL)
|
---|
106 | return MISSING_RNG_E;
|
---|
107 |
|
---|
108 | if (a == NULL)
|
---|
109 | return BAD_FUNC_ARG;
|
---|
110 |
|
---|
111 | mp_zero(a);
|
---|
112 | if (digits <= 0) {
|
---|
113 | return MP_OKAY;
|
---|
114 | }
|
---|
115 |
|
---|
116 | /* first place a random non-zero digit */
|
---|
117 | do {
|
---|
118 | ret = get_rand_digit(rng, &d);
|
---|
119 | if (ret != 0) {
|
---|
120 | return ret;
|
---|
121 | }
|
---|
122 | } while (d == 0);
|
---|
123 |
|
---|
124 | if ((ret = mp_add_d(a, d, a)) != MP_OKAY) {
|
---|
125 | return ret;
|
---|
126 | }
|
---|
127 |
|
---|
128 | while (--digits > 0) {
|
---|
129 | if ((ret = mp_lshd(a, 1)) != MP_OKAY) {
|
---|
130 | return ret;
|
---|
131 | }
|
---|
132 | if ((ret = get_rand_digit(rng, &d)) != 0) {
|
---|
133 | return ret;
|
---|
134 | }
|
---|
135 | if ((ret = mp_add_d(a, d, a)) != MP_OKAY) {
|
---|
136 | return ret;
|
---|
137 | }
|
---|
138 | }
|
---|
139 |
|
---|
140 | return ret;
|
---|
141 | }
|
---|
142 | #endif /* WC_RSA_BLINDING */
|
---|
143 |
|
---|
144 |
|
---|
145 | #ifdef HAVE_WOLF_BIGINT
|
---|
146 | void wc_bigint_init(WC_BIGINT* a)
|
---|
147 | {
|
---|
148 | if (a != NULL) {
|
---|
149 | a->buf = NULL;
|
---|
150 | a->len = 0;
|
---|
151 | a->heap = NULL;
|
---|
152 | }
|
---|
153 | }
|
---|
154 |
|
---|
155 | int wc_bigint_alloc(WC_BIGINT* a, word32 sz)
|
---|
156 | {
|
---|
157 | int err = MP_OKAY;
|
---|
158 |
|
---|
159 | if (a == NULL)
|
---|
160 | return BAD_FUNC_ARG;
|
---|
161 |
|
---|
162 | if (sz > 0) {
|
---|
163 | if (a->buf && sz > a->len) {
|
---|
164 | wc_bigint_free(a);
|
---|
165 | }
|
---|
166 | if (a->buf == NULL) {
|
---|
167 | a->buf = (byte*)XMALLOC(sz, a->heap, DYNAMIC_TYPE_WOLF_BIGINT);
|
---|
168 | }
|
---|
169 | if (a->buf == NULL) {
|
---|
170 | err = MP_MEM;
|
---|
171 | }
|
---|
172 | else {
|
---|
173 | XMEMSET(a->buf, 0, sz);
|
---|
174 | }
|
---|
175 | }
|
---|
176 | a->len = sz;
|
---|
177 |
|
---|
178 | return err;
|
---|
179 | }
|
---|
180 |
|
---|
181 | /* assumes input is big endian format */
|
---|
182 | int wc_bigint_from_unsigned_bin(WC_BIGINT* a, const byte* in, word32 inlen)
|
---|
183 | {
|
---|
184 | int err;
|
---|
185 |
|
---|
186 | if (a == NULL || in == NULL || inlen == 0)
|
---|
187 | return BAD_FUNC_ARG;
|
---|
188 |
|
---|
189 | err = wc_bigint_alloc(a, inlen);
|
---|
190 | if (err == 0) {
|
---|
191 | XMEMCPY(a->buf, in, inlen);
|
---|
192 | }
|
---|
193 |
|
---|
194 | return err;
|
---|
195 | }
|
---|
196 |
|
---|
197 | int wc_bigint_to_unsigned_bin(WC_BIGINT* a, byte* out, word32* outlen)
|
---|
198 | {
|
---|
199 | word32 sz;
|
---|
200 |
|
---|
201 | if (a == NULL || out == NULL || outlen == NULL || *outlen == 0)
|
---|
202 | return BAD_FUNC_ARG;
|
---|
203 |
|
---|
204 | /* trim to fit into output buffer */
|
---|
205 | sz = a->len;
|
---|
206 | if (a->len > *outlen) {
|
---|
207 | WOLFSSL_MSG("wc_bigint_export: Truncating output");
|
---|
208 | sz = *outlen;
|
---|
209 | }
|
---|
210 |
|
---|
211 | if (a->buf) {
|
---|
212 | XMEMCPY(out, a->buf, sz);
|
---|
213 | }
|
---|
214 |
|
---|
215 | *outlen = sz;
|
---|
216 |
|
---|
217 | return MP_OKAY;
|
---|
218 | }
|
---|
219 |
|
---|
220 | void wc_bigint_zero(WC_BIGINT* a)
|
---|
221 | {
|
---|
222 | if (a && a->buf) {
|
---|
223 | ForceZero(a->buf, a->len);
|
---|
224 | }
|
---|
225 | }
|
---|
226 |
|
---|
227 | void wc_bigint_free(WC_BIGINT* a)
|
---|
228 | {
|
---|
229 | if (a) {
|
---|
230 | if (a->buf) {
|
---|
231 | XFREE(a->buf, a->heap, DYNAMIC_TYPE_WOLF_BIGINT);
|
---|
232 | }
|
---|
233 | a->buf = NULL;
|
---|
234 | a->len = 0;
|
---|
235 | }
|
---|
236 | }
|
---|
237 |
|
---|
238 | int wc_mp_to_bigint(mp_int* src, WC_BIGINT* dst)
|
---|
239 | {
|
---|
240 | int err;
|
---|
241 | word32 sz;
|
---|
242 |
|
---|
243 | if (src == NULL || dst == NULL)
|
---|
244 | return BAD_FUNC_ARG;
|
---|
245 |
|
---|
246 | sz = mp_unsigned_bin_size(src);
|
---|
247 | err = wc_bigint_alloc(dst, sz);
|
---|
248 | if (err == MP_OKAY)
|
---|
249 | err = mp_to_unsigned_bin(src, dst->buf);
|
---|
250 |
|
---|
251 | return err;
|
---|
252 | }
|
---|
253 |
|
---|
254 | int wc_bigint_to_mp(WC_BIGINT* src, mp_int* dst)
|
---|
255 | {
|
---|
256 | int err;
|
---|
257 |
|
---|
258 | if (src == NULL || dst == NULL)
|
---|
259 | return BAD_FUNC_ARG;
|
---|
260 |
|
---|
261 | if (src->buf == NULL)
|
---|
262 | return BAD_FUNC_ARG;
|
---|
263 |
|
---|
264 | err = mp_read_unsigned_bin(dst, src->buf, src->len);
|
---|
265 | wc_bigint_free(src);
|
---|
266 |
|
---|
267 | return err;
|
---|
268 | }
|
---|
269 |
|
---|
270 | #endif /* HAVE_WOLF_BIGINT */
|
---|
271 |
|
---|
272 | #endif /* USE_FAST_MATH || !NO_BIG_INT */
|
---|