[352] | 1 | /* wolfmath.c
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| 2 | *
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| 3 | * Copyright (C) 2006-2017 wolfSSL Inc.
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| 4 | *
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| 5 | * This file is part of wolfSSL.
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| 6 | *
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| 7 | * wolfSSL is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * wolfSSL is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /* common functions for either math library */
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| 24 |
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| 25 | #ifdef HAVE_CONFIG_H
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| 26 | #include <config.h>
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| 27 | #endif
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| 28 |
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| 29 | /* in case user set USE_FAST_MATH there */
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| 30 | #include <wolfssl/wolfcrypt/settings.h>
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| 31 |
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| 32 | #ifdef USE_FAST_MATH
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| 33 | #include <wolfssl/wolfcrypt/tfm.h>
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| 34 | #else
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| 35 | #include <wolfssl/wolfcrypt/integer.h>
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| 36 | #endif
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| 37 |
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| 38 | #include <wolfssl/wolfcrypt/error-crypt.h>
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| 39 | #include <wolfssl/wolfcrypt/logging.h>
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| 40 |
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| 41 | #if defined(USE_FAST_MATH) || !defined(NO_BIG_INT)
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| 42 |
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| 43 | #ifdef WOLFSSL_ASYNC_CRYPT
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| 44 | #include <wolfssl/wolfcrypt/async.h>
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| 45 | #endif
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| 46 |
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| 47 | #ifdef NO_INLINE
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| 48 | #include <wolfssl/wolfcrypt/misc.h>
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| 49 | #else
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| 50 | #define WOLFSSL_MISC_INCLUDED
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| 51 | #include <wolfcrypt/src/misc.c>
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| 52 | #endif
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| 53 |
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| 54 |
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| 55 | #if !defined(WC_NO_CACHE_RESISTANT) && \
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| 56 | ((defined(HAVE_ECC) && defined(ECC_TIMING_RESISTANT)) || \
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| 57 | (defined(USE_FAST_MATH) && defined(TFM_TIMING_RESISTANT)))
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| 58 |
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| 59 | /* all off / all on pointer addresses for constant calculations */
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| 60 | /* ecc.c uses same table */
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| 61 | const wolfssl_word wc_off_on_addr[2] =
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| 62 | {
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| 63 | #if defined(WC_64BIT_CPU)
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| 64 | W64LIT(0x0000000000000000),
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| 65 | W64LIT(0xffffffffffffffff)
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| 66 | #elif defined(WC_16BIT_CPU)
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| 67 | 0x0000U,
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| 68 | 0xffffU
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| 69 | #else
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| 70 | /* 32 bit */
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| 71 | 0x00000000U,
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| 72 | 0xffffffffU
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| 73 | #endif
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| 74 | };
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| 75 | #endif
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| 76 |
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| 77 |
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| 78 | int get_digit_count(mp_int* a)
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| 79 | {
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| 80 | if (a == NULL)
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| 81 | return 0;
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| 82 |
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| 83 | return a->used;
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| 84 | }
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| 85 |
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| 86 | mp_digit get_digit(mp_int* a, int n)
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| 87 | {
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| 88 | if (a == NULL)
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| 89 | return 0;
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| 90 |
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| 91 | return (n >= a->used || n < 0) ? 0 : a->dp[n];
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| 92 | }
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| 93 |
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| 94 | int get_rand_digit(WC_RNG* rng, mp_digit* d)
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| 95 | {
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| 96 | return wc_RNG_GenerateBlock(rng, (byte*)d, sizeof(mp_digit));
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| 97 | }
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| 98 |
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| 99 | #ifdef WC_RSA_BLINDING
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| 100 | int mp_rand(mp_int* a, int digits, WC_RNG* rng)
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| 101 | {
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| 102 | int ret;
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| 103 | mp_digit d;
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| 104 |
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| 105 | if (rng == NULL)
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| 106 | return MISSING_RNG_E;
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| 107 |
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| 108 | if (a == NULL)
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| 109 | return BAD_FUNC_ARG;
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| 110 |
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| 111 | mp_zero(a);
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| 112 | if (digits <= 0) {
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| 113 | return MP_OKAY;
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| 114 | }
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| 115 |
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| 116 | /* first place a random non-zero digit */
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| 117 | do {
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| 118 | ret = get_rand_digit(rng, &d);
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| 119 | if (ret != 0) {
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| 120 | return ret;
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| 121 | }
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| 122 | } while (d == 0);
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| 123 |
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| 124 | if ((ret = mp_add_d(a, d, a)) != MP_OKAY) {
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| 125 | return ret;
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| 126 | }
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| 127 |
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| 128 | while (--digits > 0) {
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| 129 | if ((ret = mp_lshd(a, 1)) != MP_OKAY) {
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| 130 | return ret;
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| 131 | }
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| 132 | if ((ret = get_rand_digit(rng, &d)) != 0) {
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| 133 | return ret;
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| 134 | }
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| 135 | if ((ret = mp_add_d(a, d, a)) != MP_OKAY) {
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| 136 | return ret;
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | return ret;
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| 141 | }
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| 142 | #endif /* WC_RSA_BLINDING */
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| 143 |
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| 144 |
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| 145 | #ifdef HAVE_WOLF_BIGINT
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| 146 | void wc_bigint_init(WC_BIGINT* a)
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| 147 | {
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| 148 | if (a != NULL) {
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| 149 | a->buf = NULL;
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| 150 | a->len = 0;
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| 151 | a->heap = NULL;
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | int wc_bigint_alloc(WC_BIGINT* a, word32 sz)
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| 156 | {
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| 157 | int err = MP_OKAY;
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| 158 |
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| 159 | if (a == NULL)
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| 160 | return BAD_FUNC_ARG;
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| 161 |
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| 162 | if (sz > 0) {
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| 163 | if (a->buf && sz > a->len) {
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| 164 | wc_bigint_free(a);
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| 165 | }
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| 166 | if (a->buf == NULL) {
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| 167 | a->buf = (byte*)XMALLOC(sz, a->heap, DYNAMIC_TYPE_WOLF_BIGINT);
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| 168 | }
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| 169 | if (a->buf == NULL) {
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| 170 | err = MP_MEM;
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| 171 | }
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| 172 | else {
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| 173 | XMEMSET(a->buf, 0, sz);
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| 174 | }
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| 175 | }
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| 176 | a->len = sz;
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| 177 |
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| 178 | return err;
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| 179 | }
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| 180 |
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| 181 | /* assumes input is big endian format */
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| 182 | int wc_bigint_from_unsigned_bin(WC_BIGINT* a, const byte* in, word32 inlen)
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| 183 | {
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| 184 | int err;
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| 185 |
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| 186 | if (a == NULL || in == NULL || inlen == 0)
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| 187 | return BAD_FUNC_ARG;
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| 188 |
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| 189 | err = wc_bigint_alloc(a, inlen);
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| 190 | if (err == 0) {
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| 191 | XMEMCPY(a->buf, in, inlen);
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| 192 | }
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| 193 |
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| 194 | return err;
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| 195 | }
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| 196 |
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| 197 | int wc_bigint_to_unsigned_bin(WC_BIGINT* a, byte* out, word32* outlen)
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| 198 | {
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| 199 | word32 sz;
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| 200 |
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| 201 | if (a == NULL || out == NULL || outlen == NULL || *outlen == 0)
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| 202 | return BAD_FUNC_ARG;
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| 203 |
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| 204 | /* trim to fit into output buffer */
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| 205 | sz = a->len;
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| 206 | if (a->len > *outlen) {
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| 207 | WOLFSSL_MSG("wc_bigint_export: Truncating output");
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| 208 | sz = *outlen;
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| 209 | }
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| 210 |
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| 211 | if (a->buf) {
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| 212 | XMEMCPY(out, a->buf, sz);
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| 213 | }
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| 214 |
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| 215 | *outlen = sz;
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| 216 |
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| 217 | return MP_OKAY;
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| 218 | }
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| 219 |
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| 220 | void wc_bigint_zero(WC_BIGINT* a)
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| 221 | {
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| 222 | if (a && a->buf) {
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| 223 | ForceZero(a->buf, a->len);
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| 224 | }
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| 225 | }
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| 226 |
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| 227 | void wc_bigint_free(WC_BIGINT* a)
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| 228 | {
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| 229 | if (a) {
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| 230 | if (a->buf) {
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| 231 | XFREE(a->buf, a->heap, DYNAMIC_TYPE_WOLF_BIGINT);
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| 232 | }
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| 233 | a->buf = NULL;
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| 234 | a->len = 0;
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| 235 | }
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| 236 | }
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| 237 |
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| 238 | int wc_mp_to_bigint(mp_int* src, WC_BIGINT* dst)
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| 239 | {
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| 240 | int err;
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| 241 | word32 sz;
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| 242 |
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| 243 | if (src == NULL || dst == NULL)
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| 244 | return BAD_FUNC_ARG;
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| 245 |
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| 246 | sz = mp_unsigned_bin_size(src);
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| 247 | err = wc_bigint_alloc(dst, sz);
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| 248 | if (err == MP_OKAY)
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| 249 | err = mp_to_unsigned_bin(src, dst->buf);
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| 250 |
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| 251 | return err;
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| 252 | }
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| 253 |
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| 254 | int wc_bigint_to_mp(WC_BIGINT* src, mp_int* dst)
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| 255 | {
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| 256 | int err;
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| 257 |
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| 258 | if (src == NULL || dst == NULL)
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| 259 | return BAD_FUNC_ARG;
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| 260 |
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| 261 | if (src->buf == NULL)
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| 262 | return BAD_FUNC_ARG;
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| 263 |
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| 264 | err = mp_read_unsigned_bin(dst, src->buf, src->len);
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| 265 | wc_bigint_free(src);
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| 266 |
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| 267 | return err;
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| 268 | }
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| 269 |
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| 270 | #endif /* HAVE_WOLF_BIGINT */
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| 271 |
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| 272 | #endif /* USE_FAST_MATH || !NO_BIG_INT */
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