/*

 * 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_PMK_LEN_MAX 64

#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)

#ifdef CONFIG_SAE_PK

#define SAE_CONFIRM_MAX_LEN ((2 + SAE_MAX_HASH_LEN) + 1500)

#else /* CONFIG_SAE_PK */

#define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_HASH_LEN)

#endif /* CONFIG_SAE_PK */

#define SAE_PK_M_LEN 16

/* Special value returned by sae_parse_commit() */

#define SAE_SILENTLY_DISCARD 65535

struct sae_pk {

  struct wpabuf *m;

  struct crypto_ec_key *key;

  int group;

  struct wpabuf *pubkey; /* DER encoded subjectPublicKey */

#ifdef CONFIG_TESTING_OPTIONS

  struct crypto_ec_key *sign_key_override;

#endif /* CONFIG_TESTING_OPTIONS */

};

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;

  u8 *pw_id;

  size_t pw_id_len;

  u8 *parsed_pw_id;

  size_t parsed_pw_id_len;

  char *dec_pw_id;

  size_t dec_pw_id_len;

  unsigned int pw_id_counter;

  int vlan_id;

  u8 bssid[ETH_ALEN];

  struct wpabuf *own_rejected_groups;

  struct wpabuf *peer_rejected_groups;

  unsigned int own_addr_higher:1;

  unsigned int try_other_password:1;

#ifdef CONFIG_SAE_PK

  u8 kek[SAE_MAX_HASH_LEN];

  size_t kek_len;

  const struct sae_pk *ap_pk;

  u8 own_addr[ETH_ALEN];

  u8 peer_addr[ETH_ALEN];

  u8 fingerprint[SAE_MAX_HASH_LEN];

  size_t fingerprint_bytes;

  size_t fingerprint_bits;

  size_t lambda;

  unsigned int sec;

  u8 ssid[32];

  size_t ssid_len;

#ifdef CONFIG_TESTING_OPTIONS

  bool omit_pk_elem;

#endif /* CONFIG_TESTING_OPTIONS */

#endif /* CONFIG_SAE_PK */

  struct os_reltime disabled_until;

  const void *used_pw;

};

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;

  struct wpabuf *password_id;

#ifdef CONFIG_SAE_PK

  u8 ssid[32];

  size_t ssid_len;

#endif /* CONFIG_SAE_PK */

};

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_MAX];

  size_t pmk_len;

  int akmp; /* WPA_KEY_MGMT_* used in key derivation */

  u32 own_akm_suite_selector;

  u32 peer_akm_suite_selector;

  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) */

  unsigned int h2e:1;

  unsigned int pk:1;

  unsigned int no_pw_id:1;

  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_prepare_commit_pt(struct sae_data *sae, const struct sae_pt *pt,

        const u8 *addr1, const u8 *addr2,

        int *rejected_groups, const struct sae_pk *pk);

int sae_process_commit(struct sae_data *sae);

int sae_write_commit(struct sae_data *sae, struct wpabuf *buf,

         const struct wpabuf *token, const u8 *identifier,

         size_t identifier_len);

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, int *ie_offset);

int sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);

int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len,

          int *ie_offset);

u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);

const char * sae_state_txt(enum sae_state state);

size_t sae_ecc_prime_len_2_hash_len(size_t prime_len);

size_t sae_ffc_prime_len_2_hash_len(size_t prime_len);

struct sae_pt * sae_derive_pt(const int *groups,

            const u8 *ssid, size_t ssid_len,

            const u8 *password, size_t password_len,

            const u8 *identifier, size_t identifier_len);

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);

/* sae_pk.c */

#ifdef CONFIG_SAE_PK

bool sae_pk_valid_password(const char *pw);

#else /* CONFIG_SAE_PK */

static inline bool sae_pk_valid_password(const char *pw)

{

  return false;

}

Unexecuted instantiation: p2p.c:sae_pk_valid_password

Unexecuted instantiation: p2p_invitation.c:sae_pk_valid_password

#endif /* CONFIG_SAE_PK */

char * sae_pk_base32_encode(const u8 *src, size_t len_bits);

u8 * sae_pk_base32_decode(const char *src, size_t len, size_t *out_len);

int sae_pk_set_password(struct sae_data *sae, const char *password);

void sae_deinit_pk(struct sae_pk *pk);

struct sae_pk * sae_parse_pk(const char *val);

int sae_write_confirm_pk(struct sae_data *sae, struct wpabuf *buf);

int sae_check_confirm_pk(struct sae_data *sae, const u8 *ies, size_t ies_len);

int sae_hash(size_t hash_len, const u8 *data, size_t len, u8 *hash);

u32 sae_pk_get_be19(const u8 *buf);

void sae_pk_buf_shift_left_19(u8 *buf, size_t len);

#endif /* SAE_H */