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nettle
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dsa-keygen.c
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Niels Möller
Update copyright headers for dual licensing.
12 апр 2014, 11:44
12 апр 2014, 11:44
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/* dsa-keygen.c Generation of DSA keypairs Copyright (C) 2002, 2014 Niels Möller This file is part of GNU Nettle. GNU Nettle is free software: you can redistribute it and/or modify it under the terms of either: * the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. or * 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. or both in parallel, as here. GNU Nettle 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 copies of the GNU General Public License and the GNU Lesser General Public License along with this program. If not, see http://www.gnu.org/licenses/. */ #if HAVE_CONFIG_H # include "config.h" #endif #include <stdlib.h> #include "dsa.h" #include "bignum.h" /* Valid sizes, according to FIPS 186-3 are (1024, 160), (2048, 224), (2048, 256), (3072, 256). Currenty, we use only q_bits of 160 or 256. */ void dsa_generate_keypair (const struct dsa_params *params, mpz_t pub, mpz_t key, void *random_ctx, nettle_random_func *random) { mpz_t r; mpz_init_set(r, params->q); mpz_sub_ui(r, r, 2); nettle_mpz_random(key, random_ctx, random, r); mpz_add_ui(key, key, 1); mpz_powm(pub, params->g, key, params->p); mpz_clear (r); }