1 /* $OpenBSD: dh.h,v 1.9 2015/08/21 11:59:27 reyk 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_EC2N = 1, 25 GROUP_ECP = 2, 26 GROUP_CURVE25519 = 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 group { 39 int id; 40 struct group_id *spec; 41 42 void *dh; 43 void *ec; 44 void *curve25519; 45 46 int (*init)(struct group *); 47 int (*getlen)(struct group *); 48 int (*exchange)(struct group *, uint8_t *); 49 int (*shared)(struct group *, uint8_t *, uint8_t *); 50 }; 51 52 #define DH_MAXSZ 1024 /* 8192 bits */ 53 54 void group_init(void); 55 void group_free(struct group *); 56 struct group *group_get(uint32_t); 57 58 int dh_getlen(struct group *); 59 int dh_create_exchange(struct group *, uint8_t *); 60 int dh_create_shared(struct group *, uint8_t *, uint8_t *); 61 62 #endif /* DH_GROUP_H */ 63