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/* Special value returned by sae_parse_commit() */
22#define SAE_SILENTLY_DISCARD 65535
23
24struct sae_temporary_data {
25	u8 kck[SAE_KCK_LEN];
26	struct crypto_bignum *own_commit_scalar;
27	struct crypto_bignum *own_commit_element_ffc;
28	struct crypto_ec_point *own_commit_element_ecc;
29	struct crypto_bignum *peer_commit_element_ffc;
30	struct crypto_ec_point *peer_commit_element_ecc;
31	struct crypto_ec_point *pwe_ecc;
32	struct crypto_bignum *pwe_ffc;
33	struct crypto_bignum *sae_rand;
34	struct crypto_ec *ec;
35	int prime_len;
36	const struct dh_group *dh;
37	const struct crypto_bignum *prime;
38	const struct crypto_bignum *order;
39	struct crypto_bignum *prime_buf;
40	struct crypto_bignum *order_buf;
41	struct wpabuf *anti_clogging_token;
42};
43
44struct sae_data {
45	enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state;
46	u16 send_confirm;
47	u8 pmk[SAE_PMK_LEN];
48	struct crypto_bignum *peer_commit_scalar;
49	int group;
50	int sync;
51	struct sae_temporary_data *tmp;
52};
53
54int sae_set_group(struct sae_data *sae, int group);
55void sae_clear_temp_data(struct sae_data *sae);
56void sae_clear_data(struct sae_data *sae);
57
58int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
59		       const u8 *password, size_t password_len,
60		       struct sae_data *sae);
61int sae_process_commit(struct sae_data *sae);
62void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
63		      const struct wpabuf *token);
64u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
65		     const u8 **token, size_t *token_len, int *allowed_groups);
66void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
67int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
68u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);
69
70#endif /* SAE_H */
71