110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* Simultaneous authentication of equals
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* Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#ifndef SAE_H
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#define SAE_H
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#define SAE_KCK_LEN 32
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#define SAE_PMK_LEN 32
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#define SAE_PMKID_LEN 16
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#define SAE_MAX_PRIME_LEN 512
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#define SAE_MAX_ECC_PRIME_LEN 66
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#define SAE_MAX_HASH_LEN 64
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#define SAE_COMMIT_MAX_LEN (2 + 3 * SAE_MAX_PRIME_LEN + 255)
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#define SAE_CONFIRM_MAX_LEN (2 + SAE_MAX_HASH_LEN)
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/* Special value returned by sae_parse_commit() */
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#define SAE_SILENTLY_DISCARD 65535
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struct sae_temporary_data {
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u8 kck[SAE_MAX_HASH_LEN];
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size_t kck_len;
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struct crypto_bignum *own_commit_scalar;
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struct crypto_bignum *own_commit_element_ffc;
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struct crypto_ec_point *own_commit_element_ecc;
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struct crypto_bignum *peer_commit_element_ffc;
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struct crypto_ec_point *peer_commit_element_ecc;
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struct crypto_ec_point *pwe_ecc;
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struct crypto_bignum *pwe_ffc;
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struct crypto_bignum *sae_rand;
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struct crypto_ec *ec;
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int prime_len;
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int order_len;
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const struct dh_group *dh;
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const struct crypto_bignum *prime;
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const struct crypto_bignum *order;
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struct crypto_bignum *prime_buf;
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struct crypto_bignum *order_buf;
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struct wpabuf *anti_clogging_token;
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char *pw_id;
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int vlan_id;
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u8 bssid[ETH_ALEN];
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struct wpabuf *own_rejected_groups;
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struct wpabuf *peer_rejected_groups;
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unsigned int h2e:1;
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unsigned int own_addr_higher:1;
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};
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struct sae_pt {
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struct sae_pt *next;
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int group;
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struct crypto_ec *ec;
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struct crypto_ec_point *ecc_pt;
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const struct dh_group *dh;
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struct crypto_bignum *ffc_pt;
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};
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enum sae_state {
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SAE_NOTHING, SAE_COMMITTED, SAE_CONFIRMED, SAE_ACCEPTED
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};
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struct sae_data {
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enum sae_state state;
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u16 send_confirm;
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u8 pmk[SAE_PMK_LEN];
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u8 pmkid[SAE_PMKID_LEN];
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struct crypto_bignum *peer_commit_scalar;
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int group;
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unsigned int sync; /* protocol instance variable: Sync */
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u16 rc; /* protocol instance variable: Rc (received send-confirm) */
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struct sae_temporary_data *tmp;
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};
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int sae_set_group(struct sae_data *sae, int group);
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void sae_clear_temp_data(struct sae_data *sae);
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void sae_clear_data(struct sae_data *sae);
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int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
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const u8 *password, size_t password_len,
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const char *identifier, struct sae_data *sae);
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int sae_prepare_commit_pt(struct sae_data *sae, const struct sae_pt *pt,
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const u8 *addr1, const u8 *addr2,
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int *rejected_groups);
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int sae_process_commit(struct sae_data *sae);
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void sae_write_commit(struct sae_data *sae, struct wpabuf *buf,
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const struct wpabuf *token, const char *identifier);
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u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len,
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const u8 **token, size_t *token_len, int *allowed_groups,
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int h2e);
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void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
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int sae_check_confirm(struct sae_data *sae, const u8 *data, size_t len);
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u16 sae_group_allowed(struct sae_data *sae, int *allowed_groups, u16 group);
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const char * sae_state_txt(enum sae_state state);
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struct sae_pt * sae_derive_pt(int *groups, const u8 *ssid, size_t ssid_len,
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const u8 *password, size_t password_len,
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const char *identifier);
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struct crypto_ec_point *
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sae_derive_pwe_from_pt_ecc(const struct sae_pt *pt,
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const u8 *addr1, const u8 *addr2);
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struct crypto_bignum *
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sae_derive_pwe_from_pt_ffc(const struct sae_pt *pt,
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const u8 *addr1, const u8 *addr2);
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void sae_deinit_pt(struct sae_pt *pt);
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#endif /* SAE_H */
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