1 /* 2 * EAP server/peer: EAP-pwd shared definitions 3 * Copyright (c) 2009, Dan Harkins <dharkins@lounge.org> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef EAP_PWD_COMMON_H 10 #define EAP_PWD_COMMON_H 11 12 /* 13 * definition of a finite cyclic group 14 * TODO: support one based on a prime field 15 */ 16 typedef struct group_definition_ { 17 u16 group_num; 18 struct crypto_ec *group; 19 struct crypto_ec_point *pwe; 20 } EAP_PWD_group; 21 22 /* 23 * EAP-pwd header, included on all payloads 24 * L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set) 25 */ 26 #define EAP_PWD_HDR_SIZE 1 27 28 #define EAP_PWD_OPCODE_ID_EXCH 1 29 #define EAP_PWD_OPCODE_COMMIT_EXCH 2 30 #define EAP_PWD_OPCODE_CONFIRM_EXCH 3 31 #define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80) 32 #define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80) 33 #define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40) 34 #define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40) 35 #define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f) 36 #define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y)) 37 38 /* EAP-pwd-ID payload */ 39 struct eap_pwd_id { 40 be16 group_num; 41 u8 random_function; 42 #define EAP_PWD_DEFAULT_RAND_FUNC 1 43 u8 prf; 44 #define EAP_PWD_DEFAULT_PRF 1 45 u8 token[4]; 46 u8 prep; 47 #define EAP_PWD_PREP_NONE 0 48 #define EAP_PWD_PREP_MS 1 49 #define EAP_PWD_PREP_SSHA1 3 50 #define EAP_PWD_PREP_SSHA256 4 51 #define EAP_PWD_PREP_SSHA512 5 52 u8 identity[0]; /* length inferred from payload */ 53 } STRUCT_PACKED; 54 55 /* common routines */ 56 EAP_PWD_group * get_eap_pwd_group(u16 num); 57 int compute_password_element(EAP_PWD_group *grp, u16 num, 58 const u8 *password, size_t password_len, 59 const u8 *id_server, size_t id_server_len, 60 const u8 *id_peer, size_t id_peer_len, 61 const u8 *token); 62 int compute_keys(EAP_PWD_group *grp, const struct crypto_bignum *k, 63 const struct crypto_bignum *peer_scalar, 64 const struct crypto_bignum *server_scalar, 65 const u8 *confirm_peer, const u8 *confirm_server, 66 const u32 *ciphersuite, u8 *msk, u8 *emsk, u8 *session_id); 67 struct crypto_hash * eap_pwd_h_init(void); 68 void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len); 69 void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest); 70 struct crypto_ec_point * eap_pwd_get_element(EAP_PWD_group *group, 71 const u8 *buf); 72 struct crypto_bignum * eap_pwd_get_scalar(EAP_PWD_group *group, const u8 *buf); 73 int eap_pwd_get_rand_mask(EAP_PWD_group *group, struct crypto_bignum *_rand, 74 struct crypto_bignum *_mask, 75 struct crypto_bignum *scalar); 76 77 #endif /* EAP_PWD_COMMON_H */ 78