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1 /*
2  * EAP server/peer: EAP-SAKE shared routines
3  * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #ifndef EAP_SAKE_COMMON_H
10 #define EAP_SAKE_COMMON_H
11 
12 #define EAP_SAKE_VERSION 2
13 
14 #define EAP_SAKE_SUBTYPE_CHALLENGE 1
15 #define EAP_SAKE_SUBTYPE_CONFIRM 2
16 #define EAP_SAKE_SUBTYPE_AUTH_REJECT 3
17 #define EAP_SAKE_SUBTYPE_IDENTITY 4
18 
19 #define EAP_SAKE_AT_RAND_S 1
20 #define EAP_SAKE_AT_RAND_P 2
21 #define EAP_SAKE_AT_MIC_S 3
22 #define EAP_SAKE_AT_MIC_P 4
23 #define EAP_SAKE_AT_SERVERID 5
24 #define EAP_SAKE_AT_PEERID 6
25 #define EAP_SAKE_AT_SPI_S 7
26 #define EAP_SAKE_AT_SPI_P 8
27 #define EAP_SAKE_AT_ANY_ID_REQ 9
28 #define EAP_SAKE_AT_PERM_ID_REQ 10
29 #define EAP_SAKE_AT_ENCR_DATA 128
30 #define EAP_SAKE_AT_IV 129
31 #define EAP_SAKE_AT_PADDING 130
32 #define EAP_SAKE_AT_NEXT_TMPID 131
33 #define EAP_SAKE_AT_MSK_LIFE 132
34 
35 #define EAP_SAKE_RAND_LEN 16
36 #define EAP_SAKE_MIC_LEN 16
37 #define EAP_SAKE_ROOT_SECRET_LEN 16
38 #define EAP_SAKE_SMS_LEN 16
39 #define EAP_SAKE_TEK_AUTH_LEN 16
40 #define EAP_SAKE_TEK_CIPHER_LEN 16
41 #define EAP_SAKE_TEK_LEN (EAP_SAKE_TEK_AUTH_LEN + EAP_SAKE_TEK_CIPHER_LEN)
42 
43 #ifdef _MSC_VER
44 #pragma pack(push, 1)
45 #endif /* _MSC_VER */
46 
47 struct eap_sake_hdr {
48 	u8 version; /* EAP_SAKE_VERSION */
49 	u8 session_id;
50 	u8 subtype;
51 } STRUCT_PACKED;
52 
53 #ifdef _MSC_VER
54 #pragma pack(pop)
55 #endif /* _MSC_VER */
56 
57 
58 struct eap_sake_parse_attr {
59 	const u8 *rand_s;
60 	const u8 *rand_p;
61 	const u8 *mic_s;
62 	const u8 *mic_p;
63 	const u8 *serverid;
64 	size_t serverid_len;
65 	const u8 *peerid;
66 	size_t peerid_len;
67 	const u8 *spi_s;
68 	size_t spi_s_len;
69 	const u8 *spi_p;
70 	size_t spi_p_len;
71 	const u8 *any_id_req;
72 	const u8 *perm_id_req;
73 	const u8 *encr_data;
74 	size_t encr_data_len;
75 	const u8 *iv;
76 	size_t iv_len;
77 	const u8 *next_tmpid;
78 	size_t next_tmpid_len;
79 	const u8 *msk_life;
80 };
81 
82 int eap_sake_parse_attributes(const u8 *buf, size_t len,
83 			      struct eap_sake_parse_attr *attr);
84 void eap_sake_derive_keys(const u8 *root_secret_a, const u8 *root_secret_b,
85 			  const u8 *rand_s, const u8 *rand_p,
86 			  u8 *tek, u8 *msk, u8 *emsk);
87 int eap_sake_compute_mic(const u8 *tek_auth,
88 			 const u8 *rand_s, const u8 *rand_p,
89 			 const u8 *serverid, size_t serverid_len,
90 			 const u8 *peerid, size_t peerid_len,
91 			 int peer, const u8 *eap, size_t eap_len,
92 			 const u8 *mic_pos, u8 *mic);
93 void eap_sake_add_attr(struct wpabuf *buf, u8 type, const u8 *data,
94 		       size_t len);
95 
96 #endif /* EAP_SAKE_COMMON_H */
97