release/src/router/dropbear/kex.h

   1 /*
   2  * Dropbear - a SSH2 server
   3  *
   4  * Copyright (c) 2002,2003 Matt Johnston
   5  * All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE. */
  24
  25 #ifndef _KEX_H_
  26 #define _KEX_H_
  27
  28 #include "includes.h"
  29 #include "algo.h"
  30 #include "signkey.h"
  31
  32 void send_msg_kexinit();
  33 void recv_msg_kexinit();
  34 void send_msg_newkeys();
  35 void recv_msg_newkeys();
  36 void kexfirstinitialise();
  37
  38 struct kex_dh_param *gen_kexdh_param();
  39 void free_kexdh_param(struct kex_dh_param *param);
  40 void kexdh_comb_key(struct kex_dh_param *param, mp_int *dh_pub_them,
  41                 sign_key *hostkey);
  42
  43 #ifdef DROPBEAR_ECDH
  44 struct kex_ecdh_param *gen_kexecdh_param();
  45 void free_kexecdh_param(struct kex_ecdh_param *param);
  46 void kexecdh_comb_key(struct kex_ecdh_param *param, buffer *pub_them,
  47                 sign_key *hostkey);
  48 #endif
  49
  50 #ifdef DROPBEAR_CURVE25519
  51 struct kex_curve25519_param *gen_kexcurve25519_param();
  52 void free_kexcurve25519_param(struct kex_curve25519_param *param);
  53 void kexcurve25519_comb_key(struct kex_curve25519_param *param, buffer *pub_them,
  54                 sign_key *hostkey);
  55 #endif
  56
  57 #ifndef DISABLE_ZLIB
  58 int is_compress_trans();
  59 int is_compress_recv();
  60 #endif
  61
  62 void recv_msg_kexdh_init(); /* server */
  63
  64 void send_msg_kexdh_init(); /* client */
  65 void recv_msg_kexdh_reply(); /* client */
  66
  67 struct KEXState {
  68
  69         unsigned sentkexinit : 1; /*set when we've sent/recv kexinit packet */
  70         unsigned recvkexinit : 1;
  71         unsigned them_firstfollows : 1; /* true when first_kex_packet_follows is set */
  72         unsigned sentnewkeys : 1; /* set once we've send MSG_NEWKEYS (will be cleared once we have also received */
  73         unsigned recvnewkeys : 1; /* set once we've received MSG_NEWKEYS (cleared once we have also sent */
  74
  75         unsigned donefirstkex : 1; /* Set to 1 after the first kex has completed,
  76                                                                   ie the transport layer has been set up */
  77
  78         unsigned our_first_follows_matches : 1;
  79
  80         time_t lastkextime; /* time of the last kex */
  81         unsigned int datatrans; /* data transmitted since last kex */
  82         unsigned int datarecv; /* data received since last kex */
  83
  84 };
  85
  86 #define DH_P_1_LEN 128
  87 extern const unsigned char dh_p_1[DH_P_1_LEN];
  88 #define DH_P_14_LEN 256
  89 extern const unsigned char dh_p_14[DH_P_14_LEN];
  90
  91 struct kex_dh_param {
  92         mp_int pub; /* e */
  93         mp_int priv; /* x */
  94 };
  95
  96 #ifdef DROPBEAR_ECDH
  97 struct kex_ecdh_param {
  98         ecc_key key;
  99 };
 100 #endif
 101
 102 #ifdef DROPBEAR_CURVE25519
 103 #define CURVE25519_LEN 32
 104 struct kex_curve25519_param {
 105         unsigned char priv[CURVE25519_LEN];
 106         unsigned char pub[CURVE25519_LEN];
 107 };
 108
 109 /* No header file for curve25519_donna */
 110 int curve25519_donna(unsigned char *out, const unsigned char *secret, const unsigned char *other);
 111 #endif
 112
 113
 114 #define MAX_KEXHASHBUF 2000
 115
 116 #endif /* _KEX_H_ */