test_netis.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>


uint32_t reverse_bytes(uint32_t bytes)
{
    uint32_t aux = 0;
    uint8_t byte;
    int i;

    for(i = 0; i < 32; i+=8)
    {
        byte = (bytes >> i) & 0xff;
        aux |= byte << (32 - 8 - i);
    }
    return aux;
}


void print_hex(unsigned char *s)
{
  while(*s)
    printf("%02x", (unsigned int) *s++);
  printf("\n");
}


unsigned char *generate_random(unsigned char *data, int len, int seed)
{
    int i, num;

    srand(seed);

    for (i=0; i<(len/4); i++) {
        num = reverse_bytes(rand());
        //*((int *)data) = num;
        memcpy(data,&num,sizeof(num));
        data += 4;
    }

    i = len % 4;
    if (i > 0) {
        num = rand();
        memcpy(data, &num, i);
    }
    return data+len;
}


int main (void) {
    int seed;
    unsigned char *out;
    printf("Генерация E-Nonce/E-S1/E-S2 для Netis\n");
    printf("Введите seed: ");
    fflush(stdout);
    scanf("%d", &seed);
    generate_random(out, 16, seed);
    print_hex(out);
    return 0;
}