-static bool metakey_ec_h(connection_t *c, const char *request) {
- size_t siglen = ecdsa_size(&c->ecdsa);
- char in[MAX_STRING_SIZE];
- char key[MAX_STRING_SIZE];
- char sig[siglen];
-
- logger(LOG_DEBUG, "Got ECDH metakey from %s", c->name);
-
- if(sscanf(request, "%*d " MAX_STRING, in) != 1) {
- logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
- return false;
- }
-
- if(strlen(in) != (ECDH_SIZE + siglen) * 2) {
- logger(LOG_ERR, "Possible intruder %s (%s): %s %d != %d", c->name, c->hostname, "wrong keylength", strlen(in) / 2, (ECDH_SIZE + siglen));
- return false;
- }
-
- hex2bin(in, key, ECDH_SIZE);
- hex2bin(in + ECDH_SIZE * 2, sig, siglen);
-
- if(!ecdsa_verify(&c->ecdsa, key, ECDH_SIZE, sig)) {
- logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "invalid ECDSA signature");
- return false;
- }
-
- char shared[ECDH_SHARED_SIZE * 2 + 1];
-
- if(!ecdh_compute_shared(&c->ecdh, key, shared))
- return false;
-
- /* Update our crypto end */
-
- if(!cipher_open_by_name(&c->incipher, "aes-256-ofb"))
- return false;
- if(!digest_open_by_name(&c->indigest, "sha512", -1))
- return false;
- if(!cipher_open_by_name(&c->outcipher, "aes-256-ofb"))
- return false;
- if(!digest_open_by_name(&c->outdigest, "sha512", -1))
- return false;
-
- size_t mykeylen = cipher_keylength(&c->incipher);
- size_t hiskeylen = cipher_keylength(&c->outcipher);
-
- char *mykey;
- char *hiskey;
- char *seed;
-
- if(strcmp(myself->name, c->name) < 0) {
- mykey = key;
- hiskey = key + mykeylen * 2;
- xasprintf(&seed, "tinc TCP key expansion %s %s", myself->name, c->name);
- } else {
- mykey = key + hiskeylen * 2;
- hiskey = key;
- xasprintf(&seed, "tinc TCP key expansion %s %s", c->name, myself->name);
- }
-
- if(!prf(shared, ECDH_SHARED_SIZE, seed, strlen(seed), key, hiskeylen * 2 + mykeylen * 2))
- return false;
-
- free(seed);
-
- bin2hex(shared, shared, ECDH_SHARED_SIZE);
- shared[ECDH_SHARED_SIZE * 2] = 0;
- logger(LOG_DEBUG, "Shared secret is %s", shared);
-
- cipher_set_key(&c->incipher, mykey, true);
- digest_set_key(&c->indigest, mykey + mykeylen, mykeylen);
-
- cipher_set_key(&c->outcipher, hiskey, false);
- digest_set_key(&c->outdigest, hiskey + hiskeylen, hiskeylen);
-
- c->status.decryptin = true;
- c->status.encryptout = true;
- c->allow_request = CHALLENGE;
-
- return send_challenge(c);
-}
-
-bool metakey_h(connection_t *c, char *request) {
- if(c->protocol_minor >= 2)
- return metakey_ec_h(c, request);
-