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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
#define MSG_LEN 29
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;
int rv;
unsigned char public[KEY_LEN];
unsigned char private[KEY_LEN];
unsigned char key[KEY_LEN];
unsigned char nonce[NONCE_LEN];
int fd = open("msg.enc", O_RDONLY);
read(fd, private, KEY_LEN);
read(fd, public, KEY_LEN);
read(fd, nonce, NONCE_LEN);
read(fd, out_msg, MSG_LEN);
close(fd);
X25519(key, private, public);
rv = aead_chacha20_poly1305_open(in_msg, &in_msg_len, 1024, key, TAG_LEN, nonce, NONCE_LEN, out_msg, MSG_LEN, NULL, 0);
printf("OPEN RV:%d ILEN:%lu OLEN:%d\n", rv, in_msg_len, MSG_LEN);
printf("MSG: %s\n", in_msg);
}
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