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/* $OpenBSD: dh.h,v 1.15 2021/05/28 18:01:39 tobhe Exp $ */
/*
* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DH_GROUP_H
#define DH_GROUP_H
enum group_type {
GROUP_MODP = 0,
GROUP_ECP = 1,
GROUP_CURVE25519 = 2,
GROUP_SNTRUP761X25519 = 3
};
struct group_id {
enum group_type type;
unsigned int id;
int bits;
char *prime;
char *generator;
int nid;
};
struct dh_group {
int id;
const struct group_id
*spec;
void *dh;
void *ec;
void *curve25519;
void *kemsx;
int (*init)(struct dh_group *);
int (*getlen)(struct dh_group *);
int (*secretlen)(struct dh_group *);
int (*exchange)(struct dh_group *, uint8_t *);
int (*exchange2)(struct dh_group *, struct ibuf **, struct ibuf *);
int (*shared)(struct dh_group *, uint8_t *, uint8_t *);
int (*shared2)(struct dh_group *, struct ibuf **, struct ibuf *);
};
#define DH_MAXSZ 1024 /* 8192 bits */
void group_init(void);
void group_free(struct dh_group *);
struct dh_group *group_get(uint32_t);
const struct group_id
*group_getid(uint32_t);
int dh_create_exchange(struct dh_group *, struct ibuf **, struct ibuf *);
int dh_create_shared(struct dh_group *, struct ibuf **, struct ibuf *);
#endif /* DH_GROUP_H */
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