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Do first half of Alice-side of DH handshake.

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svn:r1485
This commit is contained in:
Nick Mathewson 2004-04-05 20:30:53 +00:00
parent 27126e5007
commit eafb8186e5
1 changed files with 17 additions and 3 deletions
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20
src/or/rendclient.c
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@ -50,6 +50,7 @@ rend_client_send_introduction(circuit_t *introcirc, circuit_t *rendcirc) {
char payload[LEN_REND_INTRODUCE1];
char tmp[20+20+128];
rend_service_descriptor_t *parsed=NULL;
crypt_path_t *cpath;
assert(introcirc->purpose == CIRCUIT_PURPOSE_C_INTRODUCING);
assert(rendcirc->purpose == CIRCUIT_PURPOSE_C_REND_READY);
@ -73,12 +74,25 @@ rend_client_send_introduction(circuit_t *introcirc, circuit_t *rendcirc) {
goto err;
}
/* Initialize the pending_final_cpath and start the DH handshake. */
cpath = rendcirc->build_state->pending_final_cpath =
tor_malloc_zero(sizeof(crypt_path_t));
if (!(cpath->handshake_state = crypto_dh_new())) {
log_fn(LOG_WARN, "Couldn't allocate DH");
goto err;
}
if (crypto_dh_generate_public(cpath->handshake_state)<0) {
log_fn(LOG_WARN, "Couldn't generate g^x");
goto err;
}
/* write the remaining items into tmp */
strncpy(tmp, rendcirc->build_state->chosen_exit, 20); /* nul pads */
memcpy(tmp+20, rendcirc->rend_cookie, 20);
memset(tmp+40, 0, 128); /* XXX g^x is all zero's for now */
/* XXX copy the appropriate stuff into rendcirc's pending_final_cpath */
if (crypto_dh_get_public(cpath->handshake_state, tmp+40, 128)<0) {
log_fn(LOG_WARN, "Couldn't extract g^x");
goto err;
}
if(crypto_pk_public_hybrid_encrypt(parsed->pk, tmp,
20+20+128, payload+20,