/* * Simultaneous authentication of equals * Copyright (c) 2012-2013, Jouni Malinen * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #ifndef SAE_H #define SAE_H #define SAE_KCK_LEN 32 #define SAE_PMK_LEN 32 #define SAE_PMKID_LEN 16 #define SAE_MAX_PRIME_LEN 512 #define SAE_MAX_ECC_PRIME_LEN 66 #define SAE_MAX_HASH_LEN 64 #define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN + 255) #define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_HASH_LEN) /* Special value returned by sae_parse_commit() */ #define SAE_SILENTLY_DISCARD 65535 struct sae_temporary_data { u8 kck[SAE_MAX_HASH_LEN]; size_t kck_len; struct crypto_bignum *own_commit_scalar; struct crypto_bignum *own_commit_element_ffc; struct crypto_ec_point *own_commit_element_ecc; struct crypto_bignum *peer_commit_element_ffc; struct crypto_ec_point *peer_commit_element_ecc; struct crypto_ec_point *pwe_ecc; struct crypto_bignum *pwe_ffc; struct crypto_bignum *sae_rand; struct crypto_ec *ec; int prime_len; int order_len; const struct dh_group *dh; const struct crypto_bignum *prime; const struct crypto_bignum *order; struct crypto_bignum *prime_buf; struct crypto_bignum *order_buf; struct wpabuf *anti_clogging_token; char *pw_id; int vlan_id; u8 bssid[ETH_ALEN]; struct wpabuf *own_rejected_groups; struct wpabuf *peer_rejected_groups; unsigned int h2e:1; unsigned int own_addr_higher:1; }; struct sae_pt { struct sae_pt *next; int group; struct crypto_ec *ec; struct crypto_ec_point *ecc_pt; const struct dh_group *dh; struct crypto_bignum *ffc_pt; }; enum sae_state { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED }; struct sae_data { enum sae_state state; u16 send_confirm; u8 pmk[SAE_PMK_LEN]; u8 pmkid[SAE_PMKID_LEN]; struct crypto_bignum *peer_commit_scalar; struct crypto_bignum *peer_commit_scalar_accepted; int group; unsigned int sync; /* protocol instance variable: Sync */ u16 rc; /* protocol instance variable: Rc (received send-confirm) */ struct sae_temporary_data *tmp; }; int sae_set_group(struct sae_data *sae, int group); void sae_clear_temp_data(struct sae_data *sae); void sae_clear_data(struct sae_data *sae); int sae_prepare_commit(const u8 *addr1, const u8 *addr2, const u8 *password, size_t password_len, const char *identifier, struct sae_data *sae); int sae_prepare_commit_pt(struct sae_data *sae, const struct sae_pt *pt, const u8 *addr1, const u8 *addr2, int *rejected_groups); int sae_process_commit(struct sae_data *sae); void sae_write_commit(struct sae_data *sae, struct wpabuf *buf, const struct wpabuf *token, const char *identifier); u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len, const u8 **token, size_t *token_len, int *allowed_groups, int h2e); void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf); int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len); u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group); const char * sae_state_txt(enum sae_state state); struct sae_pt * sae_derive_pt(int *groups, const u8 *ssid, size_t ssid_len, const u8 *password, size_t password_len, const char *identifier); struct crypto_ec_point * sae_derive_pwe_from_pt_ecc(const struct sae_pt *pt, const u8 *addr1, const u8 *addr2); struct crypto_bignum * sae_derive_pwe_from_pt_ffc(const struct sae_pt *pt, const u8 *addr1, const u8 *addr2); void sae_deinit_pt(struct sae_pt *pt); #endif /* SAE_H */