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