1 /* $OpenBSD: kex.h,v 1.26 2001/06/26 17:27:23 markus Exp $ */ 2 3 /* 4 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 #ifndef KEX_H 27 #define KEX_H 28 29 #include <openssl/evp.h> 30 #include "buffer.h" 31 #include "cipher.h" 32 #include "key.h" 33 34 #define KEX_DH1 "diffie-hellman-group1-sha1" 35 #define KEX_DHGEX "diffie-hellman-group-exchange-sha1" 36 37 enum kex_init_proposals { 38 PROPOSAL_KEX_ALGS, 39 PROPOSAL_SERVER_HOST_KEY_ALGS, 40 PROPOSAL_ENC_ALGS_CTOS, 41 PROPOSAL_ENC_ALGS_STOC, 42 PROPOSAL_MAC_ALGS_CTOS, 43 PROPOSAL_MAC_ALGS_STOC, 44 PROPOSAL_COMP_ALGS_CTOS, 45 PROPOSAL_COMP_ALGS_STOC, 46 PROPOSAL_LANG_CTOS, 47 PROPOSAL_LANG_STOC, 48 PROPOSAL_MAX 49 }; 50 51 enum kex_modes { 52 MODE_IN, 53 MODE_OUT, 54 MODE_MAX 55 }; 56 57 enum kex_exchange { 58 DH_GRP1_SHA1, 59 DH_GEX_SHA1 60 }; 61 62 #define KEX_INIT_SENT 0x0001 63 64 typedef struct Kex Kex; 65 typedef struct Mac Mac; 66 typedef struct Comp Comp; 67 typedef struct Enc Enc; 68 typedef struct Newkeys Newkeys; 69 70 struct Enc { 71 char *name; 72 Cipher *cipher; 73 int enabled; 74 u_char *key; 75 u_char *iv; 76 }; 77 struct Mac { 78 char *name; 79 int enabled; 80 EVP_MD *md; 81 int mac_len; 82 u_char *key; 83 int key_len; 84 }; 85 struct Comp { 86 int type; 87 int enabled; 88 char *name; 89 }; 90 struct Newkeys { 91 Enc enc; 92 Mac mac; 93 Comp comp; 94 }; 95 struct Kex { 96 u_char *session_id; 97 int session_id_len; 98 Newkeys *newkeys[MODE_MAX]; 99 int we_need; 100 int server; 101 char *name; 102 int hostkey_type; 103 int kex_type; 104 Buffer my; 105 Buffer peer; 106 int done; 107 int flags; 108 char *client_version_string; 109 char *server_version_string; 110 int (*verify_host_key)(Key *); 111 Key *(*load_host_key)(int); 112 }; 113 114 Kex *kex_setup(char *[PROPOSAL_MAX]); 115 void kex_finish(Kex *); 116 117 void kex_send_kexinit(Kex *); 118 void kex_input_kexinit(int, int, void *); 119 void kex_derive_keys(Kex *, u_char *, BIGNUM *); 120 121 void kexdh(Kex *); 122 void kexgex(Kex *); 123 124 Newkeys *kex_get_newkeys(int); 125 126 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 127 void dump_digest(char *, u_char *, int); 128 #endif 129 130 #endif 131