1 /**
2  * @file
3  * Additional SNMPv3 functionality RFC3414 and RFC3826 (internal API, do not use in client code).
4  */
5 
6 /*
7  * Copyright (c) 2016 Elias Oenal.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  *    this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  *    this list of conditions and the following disclaimer in the documentation
17  *    and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  *    derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * Author: Elias Oenal <lwip@eliasoenal.com>
33  */
34 
35 #ifndef LWIP_HDR_APPS_SNMP_V3_PRIV_H
36 #define LWIP_HDR_APPS_SNMP_V3_PRIV_H
37 
38 #include "lwip/apps/snmp_opts.h"
39 
40 #if LWIP_SNMP && LWIP_SNMP_V3
41 
42 #include "snmp_pbuf_stream.h"
43 
44 /* According to RFC 3411 */
45 #define SNMP_V3_MAX_ENGINE_ID_LENGTH  32
46 #define SNMP_V3_MAX_USER_LENGTH       32
47 
48 #define SNMP_V3_MAX_AUTH_PARAM_LENGTH  12
49 #define SNMP_V3_MAX_PRIV_PARAM_LENGTH  8
50 
51 #define SNMP_V3_AUTH_FLAG      0x01
52 #define SNMP_V3_PRIV_FLAG      0x02
53 
54 #define SNMP_V3_MD5_LEN        16
55 #define SNMP_V3_SHA_LEN        20
56 
57 u32_t snmpv3_get_engine_boots_internal(void);
58 u32_t snmpv3_get_engine_time_internal(void);
59 err_t snmpv3_auth(struct snmp_pbuf_stream* stream, u16_t length, const u8_t* key, u8_t algo, u8_t* hmac_out);
60 err_t snmpv3_crypt(struct snmp_pbuf_stream* stream, u16_t length, const u8_t* key,
61     const u8_t* priv_param, const u32_t engine_boots, const u32_t engine_time, u8_t algo, u8_t mode);
62 err_t snmpv3_build_priv_param(u8_t* priv_param);
63 
64 #endif
65 
66 #endif /* LWIP_HDR_APPS_SNMP_V3_PRIV_H */
67