static int receive_cid(struct key* csession_secret)
{
struct key ssession_public;
struct key tmpkey;
if (!receive_packet(CID1,
8 + keyex->size + AUTH_LENGTH,
8 + keyex->size + AUTH_LENGTH))
return 0;
if (!pkt_validate(&rpacket, &cid_authenticator)) {
debug1(DEBUG_PACKET, "Received CID failed validation");
return 0;
}
pkt_get_key(&rpacket, 8, &ssession_public, keyex);
key_exchange(&tmpkey, &ssession_public, csession_secret);
auth_start(&msg_authenticator, &tmpkey);
encr_init(&encryptor, &tmpkey);
debug1(DEBUG_PACKET, "Received CID packet");
seq_last = 0;
return 1;
}
int main(int argc, char **argv) {
int mode, sock;
size_t length;
// Alice's public and secret keys
unsigned char *a_pk;
unsigned char *a_sk;
// Bob's public key
unsigned char *b_pk;
if (argc != 1 + 6) {
fprintf(stderr, usage);
return EXIT_FAILURE;
}
// read all the keys off the disk
if (read_from_file(argv[2], &a_pk, &length)) {
fprintf(stderr, "Failed to read sender's public key\n");
return EXIT_FAILURE;
}
if (length != crypto_box_PUBLICKEYBYTES) {
fprintf(stderr, "Failed to read sender's public key: incorrect size\n");
return EXIT_FAILURE;
}
if (read_from_file(argv[3], &a_sk, &length)) {
fprintf(stderr, "Failed to read sender's private key\n");
return EXIT_FAILURE;
}
if (length != crypto_box_SECRETKEYBYTES) {
fprintf(stderr, "Failed to read sender's private key: incorrect size\n");
return EXIT_FAILURE;
}
if (read_from_file(argv[4], &b_pk, &length)) {
fprintf(stderr, "Failed to read recipient's public key\n");
return EXIT_FAILURE;
}
if (length != crypto_box_PUBLICKEYBYTES) {
fprintf(stderr, "Failed to read recipient's public key: incorrect size\n");
}
if (!strcmp(argv[1], "client")) {
mode = client_mode;
} else if (!strcmp(argv[1], "server")) {
mode = server_mode;
} else {
fprintf(stderr, usage);
return EXIT_FAILURE;
}
// Connect
if(start_networking(mode, argv[5], argv[6], &sock)) {
puts("Could not network..");
close(sock);
return EXIT_FAILURE;
}
unsigned char key[crypto_secretbox_KEYBYTES + crypto_box_ZEROBYTES] = {0};
key_exchange(a_sk, b_pk, key, mode, sock);
write_to_file((mode ? "alice.asymm" : "bob.asymm"), key + crypto_box_ZEROBYTES, crypto_secretbox_KEYBYTES);
return 0;
}
