crypto_epoch.h

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single TCP/UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2024 OpenVPN Inc <sales@openvpn.net>
 *  Copyright (C) 2024 Arne Schwabe <arne@rfc2549.org>
 *
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef CRYPTO_EPOCH_H
#define CRYPTO_EPOCH_H
 
void
ovpn_hkdf_expand(const uint8_t *secret,
                 const uint8_t *info, int info_len,
                 uint8_t *out, int out_len);
 
bool
ovpn_expand_label(const uint8_t *secret, size_t secret_len,
                  const uint8_t *label, size_t label_len,
                  const uint8_t *context, size_t context_len,
                  uint8_t *out, uint16_t out_len);
 
void
epoch_data_key_derive(struct key_parameters *key,
                      const struct epoch_key *epoch_key,
                      const struct key_type *kt);
 
void
epoch_generate_future_receive_keys(struct crypto_options *co);
 
 
void
epoch_replace_update_recv_key(struct crypto_options *co,
                              uint16_t new_epoch);
 
void
epoch_iterate_send_key(struct crypto_options *co);
 
void
free_epoch_key_ctx(struct crypto_options *co);
 
void
epoch_init_key_ctx(struct crypto_options *co, const struct key_type *key_type,
                   const struct epoch_key *e1_send, const struct epoch_key *e1_recv,
                   uint16_t future_key_count);
 
struct key_ctx *
epoch_lookup_decrypt_key(struct crypto_options *opt, uint16_t epoch);
 
void
epoch_check_send_iterate(struct crypto_options *opt);
 
 
#endif /* ifndef CRYPTO_EPOCH_H */