libsodium/test/default/sodium_utils.c

#include <stdio.h>
#include <string.h>

#define TEST_NAME "sodium_utils"
#include "cmptest.h"

int main(void)
{
  unsigned char buf1[1000];
  unsigned char buf2[1000];
  char          buf3[33];
  unsigned char buf4[4];
  const char   *hex;
  size_t        bin_len;

  randombytes(buf1, sizeof buf1);
  memcpy(buf2, buf1, sizeof buf2);
  printf("%d\n", sodium_memcmp(buf1, buf2, sizeof buf1));
  sodium_memzero(buf1, 0U);
  printf("%d\n", sodium_memcmp(buf1, buf2, sizeof buf1));
  sodium_memzero(buf1, sizeof buf1 / 2);
  printf("%d\n", sodium_memcmp(buf1, buf2, sizeof buf1));
  printf("%d\n", sodium_memcmp(buf1, buf2, 0U));
  sodium_memzero(buf2, sizeof buf2 / 2);
  printf("%d\n", sodium_memcmp(buf1, buf2, sizeof buf1));
  printf("%s\n", sodium_bin2hex(buf3, 33U,
                                (const unsigned char *)
                                "0123456789ABCDEF", 16U));
  hex = "Cafe : 6942";
  sodium_hex2bin(buf4, sizeof buf4, hex, strlen(hex), ": ", &bin_len, NULL);
  printf("%zu:%02x%02x%02x%02x\n", bin_len,
         buf4[0], buf4[1], buf4[2], buf4[3]);

  return 0;
}