Tomb/extras/kdf/gen_salt.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void print_hex(unsigned char *buf, int len)
{
int i;
for(i=0;i<len;i++){
printf("%02x", buf[i]);
}
}
int main(int argc, char **argv) {
int len=32;
int res;
unsigned char *buf;
FILE *rand;
if(argc>=2) {
if(sscanf(argv[1], "%d", &len) != 1) {
fprintf(stderr, "Error: len must be an integer\n");
return 1;
}
}
buf = calloc(len, sizeof(char));
memset(buf, 9, len);
rand = fopen("/dev/random", "r");
res = fread(buf, sizeof(char), len, rand);
if( res != len) {
fprintf(stderr, "Error reading /dev/random: %d != %d, \n", res, len);
fclose(rand);
free(buf);
return 2;
}
fclose(rand);
print_hex(buf, len);
free(buf);
return 0;
}