gf_example_7.c 1.65 KB
``````/*
* GF-Complete: A Comprehensive Open Source Library for Galois Field Arithmetic
* James S. Plank, Ethan L. Miller, Kevin M. Greenan,
* Benjamin A. Arnold, John A. Burnum, Adam W. Disney, Allen C. McBride.
*
* gf_example_7.c
*
* Demonstrating extract_word and Cauchy
*/

#include <stdio.h>
#include <getopt.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

#include "gf_complete.h"
#include "gf_rand.h"

void usage(char *s)
{
fprintf(stderr, "usage: gf_example_7\n");
exit(1);
}

int main(int argc, char **argv)
{
uint8_t *a, *b;
int i, j;
gf_t gf;

if (gf_init_hard(&gf, 3, GF_MULT_TABLE, GF_REGION_CAUCHY, GF_DIVIDE_DEFAULT, 0, 0, 0, NULL, NULL) == 0) {
fprintf(stderr, "gf_init_hard failed\n");
exit(1);
}

a = (uint8_t *) malloc(3);
b = (uint8_t *) malloc(3);

MOA_Seed(0);

for (i = 0; i < 3; i++) a[i] = MOA_Random_W(8, 1);

gf.multiply_region.w32(&gf, a, b, 5, 3, 0);

printf("a: 0x%lx    b: 0x%lx\n", (unsigned long) a, (unsigned long) b);

printf("\n");
printf("a: 0x%02x 0x%02x 0x%02x\n", a[0], a[1], a[2]);
printf("b: 0x%02x 0x%02x 0x%02x\n", b[0], b[1], b[2]);
printf("\n");

printf("a bits:");
for (i = 0; i < 3; i++) {
printf(" ");
for (j = 7; j >= 0; j--) printf("%c", (a[i] & (1 << j)) ? '1' : '0');
}
printf("\n");

printf("b bits:");
for (i = 0; i < 3; i++) {
printf(" ");
for (j = 7; j >= 0; j--) printf("%c", (b[i] & (1 << j)) ? '1' : '0');
}
printf("\n");

printf("\n");
for (i = 0; i < 8; i++) {
printf("Word %2d: %d * 5 = %d\n", i,
gf.extract_word.w32(&gf, a, 3, i),
gf.extract_word.w32(&gf, b, 3, i));
}
return 0;
}
``````