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/*
* Simultaneous authentication of equals
* Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
*
* 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_KEYSEED_KEY_LEN 32
#define SAE_MAX_PRIME_LEN 512
#define SAE_MAX_ECC_PRIME_LEN 66
#define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN)
#define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_PRIME_LEN)
/* Special value returned by sae_parse_commit() */
#define SAE_SILENTLY_DISCARD 65535
struct sae_temporary_data {
u8 kck[SAE_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;
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;
};
struct sae_data {
enum { SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED } state;
u16 send_confirm;
u8 pmk[SAE_PMK_LEN];
struct crypto_bignum *peer_commit_scalar;
int group;
int sync;
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,
struct sae_data *sae);
int sae_process_commit(struct sae_data *sae);
void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
const struct wpabuf *token);
u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
const u8 **token, size_t *token_len, int *allowed_groups);
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);
#endif /* SAE_H */
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