hostap/src/common/sae.h

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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_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);
int 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 */