5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 2000 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
24 #include "silcske_status.h"
26 /* Forward declaration for SKE object. */
27 typedef struct SilcSKEStruct *SilcSKE;
29 /* Forward declaration for security properties. */
30 typedef struct SilcSKESecurityPropertiesStruct *SilcSKESecurityProperties;
32 /* Supported Public Key Types, defined by the protocol */
34 SILC_SKE_PK_TYPE_SILC = 1, /* Mandatory type */
35 /* Optional types. These are not implemented currently
36 SILC_SKE_PK_TYPE_SSH2 = 2,
37 SILC_SKE_PK_TYPE_X509V3 = 3,
38 SILC_SKE_PK_TYPE_OPENPGP = 4,
39 SILC_SKE_PK_TYPE_SPKI = 5
43 /* Packet sending callback. Caller of the SKE routines must provide
44 a routine to send packets to negotiation parties. */
45 typedef void (*SilcSKESendPacketCb)(SilcSKE ske, SilcBuffer packet,
46 SilcPacketType type, void *context);
48 /* Generic SKE callback function. This is called in various SKE
49 routines. The SilcSKE object sent as argument provides all the data
50 callers routine might need (payloads etc). */
51 typedef void (*SilcSKECb)(SilcSKE ske, void *context);
53 /* Callback function used to verify the received public key. */
54 typedef SilcSKEStatus (*SilcSKEVerifyCb)(SilcSKE ske,
55 unsigned char *pk_data,
57 SilcSKEPKType pk_type,
60 /* Context passed to key material processing function. The function
61 returns the processed key material into this structure. */
63 unsigned char *send_iv;
64 unsigned char *receive_iv;
66 unsigned char *send_enc_key;
67 unsigned char *receive_enc_key;
68 unsigned int enc_key_len;
69 unsigned char *hmac_key;
70 unsigned int hmac_key_len;
73 #define SILC_SKE_COOKIE_LEN 16
78 /* Security Property Flags. */
80 SILC_SKE_SP_FLAG_NONE = (1L << 0),
81 SILC_SKE_SP_FLAG_NO_REPLY = (1L << 1),
82 SILC_SKE_SP_FLAG_PFS = (1L << 2),
83 } SilcSKESecurityPropertyFlag;
85 /* Security Properties negotiated between key exchange parties. This
86 structure is filled from the Key Exchange Start Payload which is used
87 to negotiate what security properties should be used in the
89 struct SilcSKESecurityPropertiesStruct {
91 SilcSKEDiffieHellmanGroup group;
95 /* XXX SilcCompression comp; */
98 struct SilcSKEStruct {
99 /* The connection object. This is initialized by the caller. */
100 SilcSocketConnection sock;
102 /* Security properties negotiated */
103 SilcSKESecurityProperties prop;
105 /* Key Exchange payloads filled during key negotiation with
106 remote data. Responder may save local data here as well. */
107 SilcSKEStartPayload *start_payload;
108 SilcSKEOnePayload *ke1_payload;
109 SilcSKETwoPayload *ke2_payload;
111 /* Temporary copy of the KE Start Payload used in the
113 SilcBuffer start_payload_copy;
115 /* If initiator, this is responders public key. If responder this
116 is our own public key. */
120 /* Random number x, 1 < x < q. This is the secret exponent
121 used in Diffie Hellman computations. */
124 /* The secret shared key */
127 /* The hash value HASH of the key exchange */
129 unsigned int hash_len;
131 /* Random Number Generator. This is set by the caller and must
132 be free'd by the caller. */
135 /* Pointer to the what ever user data. This is set by the caller
136 and is not touched by the SKE. The caller must also free this one. */
141 SilcSKE silc_ske_alloc();
142 void silc_ske_free(SilcSKE ske);
143 SilcSKEStatus silc_ske_initiator_start(SilcSKE ske, SilcRng rng,
144 SilcSocketConnection sock,
145 SilcSKEStartPayload *start_payload,
146 SilcSKESendPacketCb send_packet,
148 SilcSKEStatus silc_ske_initiator_phase_1(SilcSKE ske,
149 SilcBuffer start_payload,
152 SilcSKEStatus silc_ske_initiator_phase_2(SilcSKE ske,
153 SilcSKESendPacketCb send_packet,
155 SilcSKEStatus silc_ske_initiator_finish(SilcSKE ske,
156 SilcBuffer ke2_payload,
157 SilcSKEVerifyCb verify_key,
158 void *verify_context,
161 SilcSKEStatus silc_ske_responder_start(SilcSKE ske, SilcRng rng,
162 SilcSocketConnection sock,
163 SilcBuffer start_payload,
166 SilcSKEStatus silc_ske_responder_phase_1(SilcSKE ske,
167 SilcSKEStartPayload *start_payload,
168 SilcSKESendPacketCb send_packet,
170 SilcSKEStatus silc_ske_responder_phase_2(SilcSKE ske,
171 SilcBuffer ke1_payload,
174 SilcSKEStatus silc_ske_responder_finish(SilcSKE ske,
175 SilcPublicKey public_key,
176 SilcPrivateKey private_key,
177 SilcSKEPKType pk_type,
178 SilcSKESendPacketCb send_packet,
180 SilcSKEStatus silc_ske_end(SilcSKE ske,
181 SilcSKESendPacketCb send_packet,
183 SilcSKEStatus silc_ske_abort(SilcSKE ske, SilcSKEStatus status,
184 SilcSKESendPacketCb send_packet,
187 silc_ske_assemble_security_properties(SilcSKE ske,
188 SilcSKEStartPayload **return_payload);
190 silc_ske_select_security_properties(SilcSKE ske,
191 SilcSKEStartPayload *payload,
192 SilcSKEStartPayload *remote_payload);
193 SilcSKEStatus silc_ske_create_rnd(SilcSKE ske, SilcInt n,
196 SilcSKEStatus silc_ske_make_hash(SilcSKE ske,
197 unsigned char *return_hash,
198 unsigned int *return_hash_len);
199 SilcSKEStatus silc_ske_process_key_material(SilcSKE ske,
200 unsigned int req_iv_len,
201 unsigned int req_enc_key_len,
202 unsigned int req_hmac_key_len,
203 SilcSKEKeyMaterial *key);