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 24 struct 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 44 struct 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 54 int sae_set_group(struct sae_data *sae, int group); 55 void sae_clear_temp_data(struct sae_data *sae); 56 void sae_clear_data(struct sae_data *sae); 57 58 int sae_prepare_commit(const u8 *addr1, const u8 *addr2, 59 const u8 *password, size_t password_len, 60 struct sae_data *sae); 61 int sae_process_commit(struct sae_data *sae); 62 void sae_write_commit(struct sae_data *sae, struct wpabuf *buf, 63 const struct wpabuf *token); 64 u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len, 65 const u8 **token, size_t *token_len, int *allowed_groups); 66 void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf); 67 int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len); 68 u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group); 69 70 #endif /* SAE_H */ 71