libsodium/test/default/sodium_utils.c

#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_buf(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("%lu:%02x%02x%02x%02x\n", (unsigned long)bin_len, buf4[0], buf4[1],
           buf4[2], buf4[3]);

    return 0;
}