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/*
* Ouroboros - Copyright (C) 2016 - 2026
*
* OAP - Authentication functions
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_IRMD_OAP_AUTH_H
#define OUROBOROS_IRMD_OAP_AUTH_H
#include <ouroboros/crypt.h>
#include "hdr.h"
int oap_check_hdr(const struct oap_hdr * hdr);
/*
* name is set to the peer crt CN, "" if no crt was presented.
* cached_crt (or NULL) is the peer cert from the initial handshake, used
* to verify a cert-less re-key.
*/
int oap_auth_peer(char * name,
const struct sec_config * cfg,
const struct oap_hdr * local_hdr,
const struct oap_hdr * peer_hdr,
const buffer_t * cached_crt);
/* Derive the handshake key that seals the response identity block. */
int oap_derive_hs_key(const struct crypt_sk * sk,
buffer_t req_hash,
uint8_t * out);
/* resp_hash = H(kex || data || crt): binds the server response transcript. */
int oap_resp_hash(int md_nid,
buffer_t kex,
buffer_t data,
buffer_t crt,
buffer_t * out);
/* Fold request + response transcript + negotiated suite into the key. */
int oap_bind_session_key(struct crypt_sk * sk,
buffer_t req_hash,
buffer_t resp_hash,
int kdf_nid);
/* Server->client key-confirmation tag derived from the bound key. */
int oap_key_confirm_tag(const struct crypt_sk * sk,
buffer_t req_hash,
buffer_t resp_hash,
uint8_t * out,
size_t outlen);
#endif /* OUROBOROS_IRMD_OAP_AUTH_H */
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