13ff40c12SJohn Marino /* 23ff40c12SJohn Marino * EAP server/peer: EAP-pwd shared definitions 33ff40c12SJohn Marino * Copyright (c) 2009, Dan Harkins <dharkins@lounge.org> 43ff40c12SJohn Marino * 53ff40c12SJohn Marino * This software may be distributed under the terms of the BSD license. 63ff40c12SJohn Marino * See README for more details. 73ff40c12SJohn Marino */ 83ff40c12SJohn Marino 93ff40c12SJohn Marino #ifndef EAP_PWD_COMMON_H 103ff40c12SJohn Marino #define EAP_PWD_COMMON_H 113ff40c12SJohn Marino 123ff40c12SJohn Marino /* 133ff40c12SJohn Marino * definition of a finite cyclic group 143ff40c12SJohn Marino * TODO: support one based on a prime field 153ff40c12SJohn Marino */ 163ff40c12SJohn Marino typedef struct group_definition_ { 173ff40c12SJohn Marino u16 group_num; 18*a1157835SDaniel Fojt struct crypto_ec *group; 19*a1157835SDaniel Fojt struct crypto_ec_point *pwe; 203ff40c12SJohn Marino } EAP_PWD_group; 213ff40c12SJohn Marino 223ff40c12SJohn Marino /* 233ff40c12SJohn Marino * EAP-pwd header, included on all payloads 243ff40c12SJohn Marino * L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set) 253ff40c12SJohn Marino */ 263ff40c12SJohn Marino #define EAP_PWD_HDR_SIZE 1 273ff40c12SJohn Marino 283ff40c12SJohn Marino #define EAP_PWD_OPCODE_ID_EXCH 1 293ff40c12SJohn Marino #define EAP_PWD_OPCODE_COMMIT_EXCH 2 303ff40c12SJohn Marino #define EAP_PWD_OPCODE_CONFIRM_EXCH 3 313ff40c12SJohn Marino #define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80) 323ff40c12SJohn Marino #define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80) 333ff40c12SJohn Marino #define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40) 343ff40c12SJohn Marino #define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40) 353ff40c12SJohn Marino #define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f) 363ff40c12SJohn Marino #define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y)) 373ff40c12SJohn Marino 383ff40c12SJohn Marino /* EAP-pwd-ID payload */ 393ff40c12SJohn Marino struct eap_pwd_id { 403ff40c12SJohn Marino be16 group_num; 413ff40c12SJohn Marino u8 random_function; 423ff40c12SJohn Marino #define EAP_PWD_DEFAULT_RAND_FUNC 1 433ff40c12SJohn Marino u8 prf; 443ff40c12SJohn Marino #define EAP_PWD_DEFAULT_PRF 1 453ff40c12SJohn Marino u8 token[4]; 463ff40c12SJohn Marino u8 prep; 473ff40c12SJohn Marino #define EAP_PWD_PREP_NONE 0 483ff40c12SJohn Marino #define EAP_PWD_PREP_MS 1 49*a1157835SDaniel Fojt #define EAP_PWD_PREP_SSHA1 3 50*a1157835SDaniel Fojt #define EAP_PWD_PREP_SSHA256 4 51*a1157835SDaniel Fojt #define EAP_PWD_PREP_SSHA512 5 523ff40c12SJohn Marino u8 identity[0]; /* length inferred from payload */ 533ff40c12SJohn Marino } STRUCT_PACKED; 543ff40c12SJohn Marino 553ff40c12SJohn Marino /* common routines */ 56*a1157835SDaniel Fojt EAP_PWD_group * get_eap_pwd_group(u16 num); 57*a1157835SDaniel Fojt int compute_password_element(EAP_PWD_group *grp, u16 num, 58*a1157835SDaniel Fojt const u8 *password, size_t password_len, 59*a1157835SDaniel Fojt const u8 *id_server, size_t id_server_len, 60*a1157835SDaniel Fojt const u8 *id_peer, size_t id_peer_len, 61*a1157835SDaniel Fojt const u8 *token); 62*a1157835SDaniel Fojt int compute_keys(EAP_PWD_group *grp, const struct crypto_bignum *k, 63*a1157835SDaniel Fojt const struct crypto_bignum *peer_scalar, 64*a1157835SDaniel Fojt const struct crypto_bignum *server_scalar, 65*a1157835SDaniel Fojt const u8 *confirm_peer, const u8 *confirm_server, 66*a1157835SDaniel Fojt const u32 *ciphersuite, u8 *msk, u8 *emsk, u8 *session_id); 673ff40c12SJohn Marino struct crypto_hash * eap_pwd_h_init(void); 683ff40c12SJohn Marino void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len); 693ff40c12SJohn Marino void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest); 70*a1157835SDaniel Fojt struct crypto_ec_point * eap_pwd_get_element(EAP_PWD_group *group, 71*a1157835SDaniel Fojt const u8 *buf); 72*a1157835SDaniel Fojt struct crypto_bignum * eap_pwd_get_scalar(EAP_PWD_group *group, const u8 *buf); 73*a1157835SDaniel Fojt int eap_pwd_get_rand_mask(EAP_PWD_group *group, struct crypto_bignum *_rand, 74*a1157835SDaniel Fojt struct crypto_bignum *_mask, 75*a1157835SDaniel Fojt struct crypto_bignum *scalar); 763ff40c12SJohn Marino 773ff40c12SJohn Marino #endif /* EAP_PWD_COMMON_H */ 78