2 * Simultaneous authentication of equals
3 * Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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)
21 /* Special value returned by sae_parse_commit() */
22 #define SAE_SILENTLY_DISCARD 65535
24 struct sae_temporary_data {
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;
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;
45 enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state;
48 u8 pmkid[SAE_PMKID_LEN];
49 struct crypto_bignum *peer_commit_scalar;
52 struct sae_temporary_data *tmp;
55 int sae_set_group(struct sae_data *sae, int group);
56 void sae_clear_temp_data(struct sae_data *sae);
57 void sae_clear_data(struct sae_data *sae);
59 int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
60 const u8 *password, size_t password_len,
61 struct sae_data *sae);
62 int sae_process_commit(struct sae_data *sae);
63 void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
64 const struct wpabuf *token);
65 u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
66 const u8 **token, size_t *token_len, int *allowed_groups);
67 void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
68 int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
69 u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);