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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <crypto.h>
#include <curve25519.h>
#define NONCE_LEN 8
#define TAG_LEN 16
#define KEY_LEN 32
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 in_msg[1024];
unsigned char out_msg[1024];
size_t in_msg_len;
size_t out_msg_len;
int rv;
unsigned char public1[KEY_LEN];
unsigned char private1[KEY_LEN];
unsigned char public2[KEY_LEN];
unsigned char private2[KEY_LEN];
unsigned char key[KEY_LEN];
unsigned char nonce[NONCE_LEN];
strcpy((char *)in_msg, "PERA JE CAR!");
in_msg_len = strlen((char *)in_msg) + 1;
v_rng(nonce, NONCE_LEN);
X25519_keypair(public1, private1, v_rng);
X25519_keypair(public2, private2, v_rng);
X25519(key, private1, public2);
rv = aead_chacha20_poly1305_seal(out_msg, &out_msg_len, 1024, key, TAG_LEN, nonce, NONCE_LEN, in_msg, in_msg_len, NULL, 0);
printf("SEAL RV:%d ILEN:%lu OLEN:%lu\n", rv, in_msg_len, out_msg_len);
unlink("msg.enc");
int fd = open("msg.enc", O_WRONLY | O_CREAT);
write(fd, private2, KEY_LEN);
write(fd, public1, KEY_LEN);
write(fd, nonce, NONCE_LEN);
write(fd, out_msg, out_msg_len);
close(fd);
}
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