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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <curve25519.h>
#define KEY_LEN 32
#define SIG_LEN 64
static int v_rng(void *buf, size_t bufsize) {
int fd;
if((fd = open("/dev/urandom", O_RDONLY)) < 0) return -1;
size_t nb = read(fd, buf, bufsize);
close(fd);
if (nb != bufsize) return -1;
return 0;
}
int main(int argc, char *argv[]) {
unsigned char msg[1024];
size_t msg_len;
unsigned char public[KEY_LEN];
unsigned char private[KEY_LEN * 2];
unsigned char signature[SIG_LEN];
strcpy((char *)msg, "PERA JE CAR!");
msg_len = strlen((char *)msg) + 1;
ED25519_keypair(public, private, v_rng);
ED25519_sign(signature, msg, msg_len, private);
unlink("msg.sig");
int fd = open("msg.sig", O_WRONLY | O_CREAT);
write(fd, public, KEY_LEN);
write(fd, signature, SIG_LEN);
close(fd);
}
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