src/common/sae.h

   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_MAX_PRIME_LEN 512
  16 #define SAE_MAX_ECC_PRIME_LEN 66
  17 #define SAE_MAX_HASH_LEN 64
  18 #define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN + 255)
  19 #define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_HASH_LEN)
  20
  21 /* Special value returned by sae_parse_commit() */
  22 #define SAE_SILENTLY_DISCARD 65535
  23
  24 struct sae_temporary_data {
  25         u8 kck[SAE_MAX_HASH_LEN];
  26         size_t kck_len;
  27         struct crypto_bignum *own_commit_scalar;
  28         struct crypto_bignum *own_commit_element_ffc;
  29         struct crypto_ec_point *own_commit_element_ecc;
  30         struct crypto_bignum *peer_commit_element_ffc;
  31         struct crypto_ec_point *peer_commit_element_ecc;
  32         struct crypto_ec_point *pwe_ecc;
  33         struct crypto_bignum *pwe_ffc;
  34         struct crypto_bignum *sae_rand;
  35         struct crypto_ec *ec;
  36         int prime_len;
  37         int order_len;
  38         const struct dh_group *dh;
  39         const struct crypto_bignum *prime;
  40         const struct crypto_bignum *order;
  41         struct crypto_bignum *prime_buf;
  42         struct crypto_bignum *order_buf;
  43         struct wpabuf *anti_clogging_token;
  44         char *pw_id;
  45         int vlan_id;
  46         u8 bssid[ETH_ALEN];
  47         struct wpabuf *own_rejected_groups;
  48         struct wpabuf *peer_rejected_groups;
  49         unsigned int h2e:1;
  50         unsigned int own_addr_higher:1;
  51 };
  52
  53 struct sae_pt {
  54         struct sae_pt *next;
  55         int group;
  56         struct crypto_ec *ec;
  57         struct crypto_ec_point *ecc_pt;
  58
  59         const struct dh_group *dh;
  60         struct crypto_bignum *ffc_pt;
  61 };
  62
  63 enum sae_state {
  64         SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED
  65 };
  66
  67 struct sae_data {
  68         enum sae_state state;
  69         u16 send_confirm;
  70         u8 pmk[SAE_PMK_LEN];
  71         u8 pmkid[SAE_PMKID_LEN];
  72         struct crypto_bignum *peer_commit_scalar;
  73         struct crypto_bignum *peer_commit_scalar_accepted;
  74         int group;
  75         unsigned int sync; /* protocol instance variable: Sync */
  76         u16 rc; /* protocol instance variable: Rc (received send-confirm) */
  77         struct sae_temporary_data *tmp;
  78 };
  79
  80 int sae_set_group(struct sae_data *sae, int group);
  81 void sae_clear_temp_data(struct sae_data *sae);
  82 void sae_clear_data(struct sae_data *sae);
  83
  84 int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
  85                        const u8 *password, size_t password_len,
  86                        const char *identifier, struct sae_data *sae);
  87 int sae_prepare_commit_pt(struct sae_data *sae, const struct sae_pt *pt,
  88                           const u8 *addr1, const u8 *addr2,
  89                           int *rejected_groups);
  90 int sae_process_commit(struct sae_data *sae);
  91 void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
  92                       const struct wpabuf *token, const char *identifier);
  93 u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
  94                      const u8 **token, size_t *token_len, int *allowed_groups,
  95                      int h2e);
  96 void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
  97 int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
  98 u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);
  99 const char * sae_state_txt(enum sae_state state);
 100 struct sae_pt * sae_derive_pt(int *groups, const u8 *ssid, size_t ssid_len,
 101                               const u8 *password, size_t password_len,
 102                               const char *identifier);
 103 struct crypto_ec_point *
 104 sae_derive_pwe_from_pt_ecc(const struct sae_pt *pt,
 105                            const u8 *addr1, const u8 *addr2);
 106 struct crypto_bignum *
 107 sae_derive_pwe_from_pt_ffc(const struct sae_pt *pt,
 108                            const u8 *addr1, const u8 *addr2);
 109 void sae_deinit_pt(struct sae_pt *pt);
 110
 111 #endif /* SAE_H */