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_MAX_PRIME_LEN 512 16 #define SAE_MAX_ECC_PRIME_LEN 66 17 #define SAE_MAX_HASH_LEN 64 18 #define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN + 255) 19 #define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_HASH_LEN) 20 21 /* Special value returned by sae_parse_commit() */ 22 #define SAE_SILENTLY_DISCARD 65535 23 24 struct sae_temporary_data { 25 u8 kck[SAE_MAX_HASH_LEN]; 26 size_t kck_len; 27 struct crypto_bignum *own_commit_scalar; 28 struct crypto_bignum *own_commit_element_ffc; 29 struct crypto_ec_point *own_commit_element_ecc; 30 struct crypto_bignum *peer_commit_element_ffc; 31 struct crypto_ec_point *peer_commit_element_ecc; 32 struct crypto_ec_point *pwe_ecc; 33 struct crypto_bignum *pwe_ffc; 34 struct crypto_bignum *sae_rand; 35 struct crypto_ec *ec; 36 int prime_len; 37 int order_len; 38 const struct dh_group *dh; 39 const struct crypto_bignum *prime; 40 const struct crypto_bignum *order; 41 struct crypto_bignum *prime_buf; 42 struct crypto_bignum *order_buf; 43 struct wpabuf *anti_clogging_token; 44 char *pw_id; 45 int vlan_id; 46 u8 bssid[ETH_ALEN]; 47 struct wpabuf *own_rejected_groups; 48 struct wpabuf *peer_rejected_groups; 49 unsigned int h2e:1; 50 unsigned int own_addr_higher:1; 51 }; 52 53 struct sae_pt { 54 struct sae_pt *next; 55 int group; 56 struct crypto_ec *ec; 57 struct crypto_ec_point *ecc_pt; 58 59 const struct dh_group *dh; 60 struct crypto_bignum *ffc_pt; 61 }; 62 63 enum sae_state { 64 SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED 65 }; 66 67 struct sae_data { 68 enum sae_state state; 69 u16 send_confirm; 70 u8 pmk[SAE_PMK_LEN]; 71 u8 pmkid[SAE_PMKID_LEN]; 72 struct crypto_bignum *peer_commit_scalar; 73 struct crypto_bignum *peer_commit_scalar_accepted; 74 int group; 75 unsigned int sync; /* protocol instance variable: Sync */ 76 u16 rc; /* protocol instance variable: Rc (received send-confirm) */ 77 struct sae_temporary_data *tmp; 78 }; 79 80 int sae_set_group(struct sae_data *sae, int group); 81 void sae_clear_temp_data(struct sae_data *sae); 82 void sae_clear_data(struct sae_data *sae); 83 84 int sae_prepare_commit(const u8 *addr1, const u8 *addr2, 85 const u8 *password, size_t password_len, 86 const char *identifier, struct sae_data *sae); 87 int sae_prepare_commit_pt(struct sae_data *sae, const struct sae_pt *pt, 88 const u8 *addr1, const u8 *addr2, 89 int *rejected_groups); 90 int sae_process_commit(struct sae_data *sae); 91 int sae_write_commit(struct sae_data *sae, struct wpabuf *buf, 92 const struct wpabuf *token, const char *identifier); 93 u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len, 94 const u8 **token, size_t *token_len, int *allowed_groups, 95 int h2e); 96 void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf); 97 int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len); 98 u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group); 99 const char * sae_state_txt(enum sae_state state); 100 struct sae_pt * sae_derive_pt(int *groups, const u8 *ssid, size_t ssid_len, 101 const u8 *password, size_t password_len, 102 const char *identifier); 103 struct crypto_ec_point * 104 sae_derive_pwe_from_pt_ecc(const struct sae_pt *pt, 105 const u8 *addr1, const u8 *addr2); 106 struct crypto_bignum * 107 sae_derive_pwe_from_pt_ffc(const struct sae_pt *pt, 108 const u8 *addr1, const u8 *addr2); 109 void sae_deinit_pt(struct sae_pt *pt); 110 111 #endif /* SAE_H */ 112