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 #include <openssl/bn.h> 13 #include <openssl/ec.h> 14 #include <openssl/evp.h> 15 16 /* 17 * definition of a finite cyclic group 18 * TODO: support one based on a prime field 19 */ 20 typedef struct group_definition_ { 21 u16 group_num; 22 EC_GROUP *group; 23 EC_POINT *pwe; 24 BIGNUM *order; 25 BIGNUM *prime; 26 } EAP_PWD_group; 27 28 /* 29 * EAP-pwd header, included on all payloads 30 * L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set) 31 */ 32 #define EAP_PWD_HDR_SIZE 1 33 34 #define EAP_PWD_OPCODE_ID_EXCH 1 35 #define EAP_PWD_OPCODE_COMMIT_EXCH 2 36 #define EAP_PWD_OPCODE_CONFIRM_EXCH 3 37 #define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80) 38 #define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80) 39 #define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40) 40 #define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40) 41 #define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f) 42 #define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y)) 43 44 /* EAP-pwd-ID payload */ 45 struct eap_pwd_id { 46 be16 group_num; 47 u8 random_function; 48 #define EAP_PWD_DEFAULT_RAND_FUNC 1 49 u8 prf; 50 #define EAP_PWD_DEFAULT_PRF 1 51 u8 token[4]; 52 u8 prep; 53 #define EAP_PWD_PREP_NONE 0 54 #define EAP_PWD_PREP_MS 1 55 u8 identity[0]; /* length inferred from payload */ 56 } STRUCT_PACKED; 57 58 /* common routines */ 59 int compute_password_element(EAP_PWD_group *grp, u16 num, 60 const u8 *password, size_t password_len, 61 const u8 *id_server, size_t id_server_len, 62 const u8 *id_peer, size_t id_peer_len, 63 const u8 *token); 64 int compute_keys(EAP_PWD_group *grp, BN_CTX *bnctx, const BIGNUM *k, 65 const BIGNUM *peer_scalar, const BIGNUM *server_scalar, 66 const u8 *confirm_peer, const u8 *confirm_server, 67 const u32 *ciphersuite, u8 *msk, u8 *emsk, u8 *session_id); 68 struct crypto_hash * eap_pwd_h_init(void); 69 void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len); 70 void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest); 71 72 #endif /* EAP_PWD_COMMON_H */ 73