xref: /freebsd/contrib/wpa/src/common/sae.h (revision 4436b51dff5736e74da464946049ea6899a88938)
1 /*
2  * Simultaneous authentication of equals
3  * Copyright (c) 2012-2013, 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 SAE_H
10 #define SAE_H
11 
12 #define SAE_KCK_LEN 32
13 #define SAE_PMK_LEN 32
14 #define SAE_PMKID_LEN 16
15 #define SAE_KEYSEED_KEY_LEN 32
16 #define SAE_MAX_PRIME_LEN 512
17 #define SAE_MAX_ECC_PRIME_LEN 66
18 #define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN)
19 #define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_PRIME_LEN)
20 
21 struct sae_temporary_data {
22 	u8 kck[SAE_KCK_LEN];
23 	struct crypto_bignum *own_commit_scalar;
24 	struct crypto_bignum *own_commit_element_ffc;
25 	struct crypto_ec_point *own_commit_element_ecc;
26 	struct crypto_bignum *peer_commit_element_ffc;
27 	struct crypto_ec_point *peer_commit_element_ecc;
28 	struct crypto_ec_point *pwe_ecc;
29 	struct crypto_bignum *pwe_ffc;
30 	struct crypto_bignum *sae_rand;
31 	struct crypto_ec *ec;
32 	int prime_len;
33 	const struct dh_group *dh;
34 	const struct crypto_bignum *prime;
35 	const struct crypto_bignum *order;
36 	struct crypto_bignum *prime_buf;
37 	struct crypto_bignum *order_buf;
38 	struct wpabuf *anti_clogging_token;
39 };
40 
41 struct sae_data {
42 	enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state;
43 	u16 send_confirm;
44 	u8 pmk[SAE_PMK_LEN];
45 	struct crypto_bignum *peer_commit_scalar;
46 	int group;
47 	int sync;
48 	struct sae_temporary_data *tmp;
49 };
50 
51 int sae_set_group(struct sae_data *sae, int group);
52 void sae_clear_temp_data(struct sae_data *sae);
53 void sae_clear_data(struct sae_data *sae);
54 
55 int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
56 		       const u8 *password, size_t password_len,
57 		       struct sae_data *sae);
58 int sae_process_commit(struct sae_data *sae);
59 void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
60 		      const struct wpabuf *token);
61 u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
62 		     const u8 **token, size_t *token_len, int *allowed_groups);
63 void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
64 int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
65 u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);
66 
67 #endif /* SAE_H */
68