wolfSSL SSL/TLS library, support up to TLS1.3
Dependents: CyaSSL-Twitter-OAuth4Tw Example-client-tls-cert TwitterReader TweetTest ... more
wolfcrypt/src/wolfmath.c
- Committer:
- wolfSSL
- Date:
- 2017-05-02
- Revision:
- 6:fa3bd0ca5896
File content as of revision 6:fa3bd0ca5896:
/* wolfmath.c * * Copyright (C) 2006-2016 wolfSSL Inc. * * This file is part of wolfSSL. * * wolfSSL is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * wolfSSL is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA */ /* common functions for either math library */ #ifdef HAVE_CONFIG_H #include <config.h> #endif /* in case user set USE_FAST_MATH there */ #include <wolfssl/wolfcrypt/settings.h> #ifdef USE_FAST_MATH #include <wolfssl/wolfcrypt/tfm.h> #else #include <wolfssl/wolfcrypt/integer.h> #endif #include <wolfssl/wolfcrypt/error-crypt.h> #include <wolfssl/wolfcrypt/logging.h> #if defined(USE_FAST_MATH) || !defined(NO_BIG_INT) int get_digit_count(mp_int* a) { if (a == NULL) return 0; return a->used; } mp_digit get_digit(mp_int* a, int n) { if (a == NULL) return 0; return (n >= a->used || n < 0) ? 0 : a->dp[n]; } int get_rand_digit(WC_RNG* rng, mp_digit* d) { return wc_RNG_GenerateBlock(rng, (byte*)d, sizeof(mp_digit)); } int mp_rand(mp_int* a, int digits, WC_RNG* rng) { int ret; mp_digit d; if (rng == NULL) return MISSING_RNG_E; if (a == NULL) return BAD_FUNC_ARG; mp_zero(a); if (digits <= 0) { return MP_OKAY; } /* first place a random non-zero digit */ do { ret = get_rand_digit(rng, &d); if (ret != 0) { return ret; } } while (d == 0); if ((ret = mp_add_d(a, d, a)) != MP_OKAY) { return ret; } while (--digits > 0) { if ((ret = mp_lshd(a, 1)) != MP_OKAY) { return ret; } if ((ret = get_rand_digit(rng, &d)) != 0) { return ret; } if ((ret = mp_add_d(a, d, a)) != MP_OKAY) { return ret; } } return ret; } #endif