1 /* $OpenBSD: dh.h,v 1.15 2021/05/28 18:01:39 tobhe Exp $ */ 2 3 /* 4 * Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef DH_GROUP_H 20 #define DH_GROUP_H 21 22 enum group_type { 23 GROUP_MODP = 0, 24 GROUP_ECP = 1, 25 GROUP_CURVE25519 = 2, 26 GROUP_SNTRUP761X25519 = 3 27 }; 28 29 struct group_id { 30 enum group_type type; 31 unsigned int id; 32 int bits; 33 char *prime; 34 char *generator; 35 int nid; 36 }; 37 38 struct dh_group { 39 int id; 40 const struct group_id 41 *spec; 42 43 void *dh; 44 void *ec; 45 void *curve25519; 46 void *kemsx; 47 48 int (*init)(struct dh_group *); 49 int (*getlen)(struct dh_group *); 50 int (*secretlen)(struct dh_group *); 51 int (*exchange)(struct dh_group *, uint8_t *); 52 int (*exchange2)(struct dh_group *, struct ibuf **, struct ibuf *); 53 int (*shared)(struct dh_group *, uint8_t *, uint8_t *); 54 int (*shared2)(struct dh_group *, struct ibuf **, struct ibuf *); 55 }; 56 57 #define DH_MAXSZ 1024 /* 8192 bits */ 58 59 void group_init(void); 60 void group_free(struct dh_group *); 61 struct dh_group *group_get(uint32_t); 62 const struct group_id 63 *group_getid(uint32_t); 64 65 int dh_create_exchange(struct dh_group *, struct ibuf **, struct ibuf *); 66 int dh_create_shared(struct dh_group *, struct ibuf **, struct ibuf *); 67 68 #endif /* DH_GROUP_H */ 69