mirror of
https://github.com/cmand/yarrp.git
synced 2024-05-11 05:55:06 +00:00
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* ------------------------------------------------------------------------
|
|
libcperm - A library for creating random permutations.
|
|
Copyright (c) 2014, Lance Alt
|
|
|
|
This file is part of libcperm.
|
|
|
|
This library 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This library 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "cperm.h"
|
|
#include "cperm-internal.h"
|
|
#include "cycle.h"
|
|
|
|
int perm_cycle_create(struct cperm_t* perm) {
|
|
struct cycle_data_t* cycle_data = malloc(sizeof(*cycle_data));
|
|
if(!cycle_data) {
|
|
cperm_errno = PERM_ERROR_NOMEM;
|
|
return PERM_ERROR_NOMEM;
|
|
}
|
|
|
|
cycle_data->next = 0;
|
|
cycle_data->count = 0;
|
|
perm->mode_data = cycle_data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perm_cycle_get(struct cperm_t* perm, uint32_t pt, uint32_t* ct) {
|
|
cperm_errno = PERM_ERROR_OP_NOT_SUPP;
|
|
return PERM_ERROR_OP_NOT_SUPP;
|
|
}
|
|
|
|
int perm_cycle_next(struct cperm_t* perm, uint32_t* ct) {
|
|
struct cycle_data_t* cycle_data = perm->mode_data;
|
|
|
|
if(cycle_data->count >= perm->range) {
|
|
cperm_errno = PERM_END;
|
|
return PERM_END;
|
|
}
|
|
|
|
do {
|
|
perm->cipher->enc(perm, cycle_data->next, ct);
|
|
cycle_data->next++;
|
|
}while(*ct >= perm->range);
|
|
|
|
cycle_data->count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perm_cycle_destroy(struct cperm_t* perm) {
|
|
free(perm->mode_data);
|
|
return 0;
|
|
}
|