1a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt/* 2a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt * Simultaneous authentication of equals 3a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt * Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi> 4a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt * 5a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 6a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt * See README for more details. 7a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt */ 8a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 9a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#ifndef SAE_H 10a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_H 11a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 12a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_KCK_LEN 32 13a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_PMK_LEN 32 14a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_PMKID_LEN 16 15a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_KEYSEED_KEY_LEN 32 16a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_MAX_PRIME_LEN 512 17a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_MAX_ECC_PRIME_LEN 66 18a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN) 19a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_PRIME_LEN) 20a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 214171258d30a612645aa061cede62233b5c58ca2aDmitry Shmidt/* Special value returned by sae_parse_commit() */ 224171258d30a612645aa061cede62233b5c58ca2aDmitry Shmidt#define SAE_SILENTLY_DISCARD 65535 234171258d30a612645aa061cede62233b5c58ca2aDmitry Shmidt 24a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtstruct sae_temporary_data { 25a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt u8 kck[SAE_KCK_LEN]; 26a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *own_commit_scalar; 27a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *own_commit_element_ffc; 28a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_ec_point *own_commit_element_ecc; 29a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *peer_commit_element_ffc; 30a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_ec_point *peer_commit_element_ecc; 31a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_ec_point *pwe_ecc; 32a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *pwe_ffc; 33a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *sae_rand; 34a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_ec *ec; 35a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt int prime_len; 36a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const struct dh_group *dh; 37a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const struct crypto_bignum *prime; 38a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const struct crypto_bignum *order; 39a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *prime_buf; 40a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *order_buf; 41fb45fd5cfed8bdccd0859c7fc05449fc187e2d06Dmitry Shmidt struct wpabuf *anti_clogging_token; 42a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt}; 43a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 44a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtstruct sae_data { 45a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state; 46a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt u16 send_confirm; 47a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt u8 pmk[SAE_PMK_LEN]; 48a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct crypto_bignum *peer_commit_scalar; 49a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt int group; 50746bde5f922dfd627d25111da4313395bc4ed6afDmitry Shmidt int sync; 51a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct sae_temporary_data *tmp; 52a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt}; 53a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 54a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtint sae_set_group(struct sae_data *sae, int group); 55a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtvoid sae_clear_temp_data(struct sae_data *sae); 56a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtvoid sae_clear_data(struct sae_data *sae); 57a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 58a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtint sae_prepare_commit(const u8 *addr1, const u8 *addr2, 59a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const u8 *password, size_t password_len, 60a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt struct sae_data *sae); 61a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtint sae_process_commit(struct sae_data *sae); 62a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtvoid sae_write_commit(struct sae_data *sae, struct wpabuf *buf, 63a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const struct wpabuf *token); 64a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtu16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len, 65a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt const u8 **token, size_t *token_len, int *allowed_groups); 66a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtvoid sae_write_confirm(struct sae_data *sae, struct wpabuf *buf); 67a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidtint sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len); 68fb45fd5cfed8bdccd0859c7fc05449fc187e2d06Dmitry Shmidtu16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group); 69a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt 70a54fa5fb807eaeff45464139b5a7759f060cec68Dmitry Shmidt#endif /* SAE_H */ 71