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Diffstat (limited to 'src/reducer/validation_XY_PRIME.c')

-rw-r--r-- | src/reducer/validation_XY_PRIME.c | 53 |

1 files changed, 53 insertions, 0 deletions

diff --git a/src/reducer/validation_XY_PRIME.c b/src/reducer/validation_XY_PRIME.c new file mode 100644 index 0000000..ab24014 --- /dev/null +++ b/src/reducer/validation_XY_PRIME.c @@ -0,0 +1,53 @@ +/* + This file is part of Anastasis + Copyright (C) 2020, 2021 Taler Systems SA + + Anastasis is free software; you can redistribute it and/or modify it under the + terms of the GNU Lesser General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + Anastasis 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 + Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file redux/validation_XY_PRIME.c + * @brief anastasis reducer api + * @author Christian Grothoff + * @author Dominik Meister + * @author Dennis Neufeld + */ +#include <string.h> +#include <stdbool.h> +#include <stdio.h> +#include <gcrypt.h> + +/** + * Function to validate a prime number. + * + * @param pr_number prime number to validate (input) + * @return true if pr_number is a prime, else false + */ +bool +XY_PRIME_check (const char *pr_number) +{ + unsigned long long n; + char dummy; + gcry_mpi_t p; + bool is_prime; + + if (1 != sscanf (pr_number, + "%llu%c", + &n, + &dummy)) + return false; + p = gcry_mpi_set_ui (NULL, + (unsigned long) n); + is_prime = (0 == gcry_prime_check (p, + 0)); + gcry_mpi_release (p); + return is_prime; +} |