1 /* $OpenBSD: kex.h,v 1.31 2002/05/16 22:02:50 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_int key_len; 75 u_int block_size; 76 u_char *key; 77 u_char *iv; 78 }; 79 struct Mac { 80 char *name; 81 int enabled; 82 const EVP_MD *md; 83 int mac_len; 84 u_char *key; 85 int key_len; 86 }; 87 struct Comp { 88 int type; 89 int enabled; 90 char *name; 91 }; 92 struct Newkeys { 93 Enc enc; 94 Mac mac; 95 Comp comp; 96 }; 97 struct Kex { 98 u_char *session_id; 99 int session_id_len; 100 Newkeys *newkeys[MODE_MAX]; 101 int we_need; 102 int server; 103 char *name; 104 int hostkey_type; 105 int kex_type; 106 Buffer my; 107 Buffer peer; 108 int done; 109 int flags; 110 char *client_version_string; 111 char *server_version_string; 112 int (*verify_host_key)(Key *); 113 Key *(*load_host_key)(int); 114 int (*host_key_index)(Key *); 115 }; 116 117 Kex *kex_setup(char *[PROPOSAL_MAX]); 118 void kex_finish(Kex *); 119 120 void kex_send_kexinit(Kex *); 121 void kex_input_kexinit(int, u_int32_t, void *); 122 void kex_derive_keys(Kex *, u_char *, BIGNUM *); 123 124 void kexdh(Kex *); 125 void kexgex(Kex *); 126 127 Newkeys *kex_get_newkeys(int); 128 129 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 130 void dump_digest(char *, u_char *, int); 131 #endif 132 133 #endif 134