1 /* 2 * EAP server/peer: EAP-pwd shared definitions 3 * Copyright (c) 2009, Dan Harkins <dharkins (at) 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/sha.h> 14 #include <openssl/ec.h> 15 #include <openssl/evp.h> 16 #include <openssl/hmac.h> 17 18 /* 19 * definition of a finite cyclic group 20 * TODO: support one based on a prime field 21 */ 22 typedef struct group_definition_ { 23 u16 group_num; 24 EC_GROUP *group; 25 EC_POINT *pwe; 26 BIGNUM *order; 27 BIGNUM *prime; 28 } EAP_PWD_group; 29 30 /* 31 * EAP-pwd header, included on all payloads 32 * L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set) 33 */ 34 #define EAP_PWD_HDR_SIZE 1 35 36 #define EAP_PWD_OPCODE_ID_EXCH 1 37 #define EAP_PWD_OPCODE_COMMIT_EXCH 2 38 #define EAP_PWD_OPCODE_CONFIRM_EXCH 3 39 #define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80) 40 #define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80) 41 #define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40) 42 #define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40) 43 #define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f) 44 #define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y)) 45 46 /* EAP-pwd-ID payload */ 47 struct eap_pwd_id { 48 be16 group_num; 49 u8 random_function; 50 #define EAP_PWD_DEFAULT_RAND_FUNC 1 51 u8 prf; 52 #define EAP_PWD_DEFAULT_PRF 1 53 u8 token[4]; 54 u8 prep; 55 #define EAP_PWD_PREP_NONE 0 56 #define EAP_PWD_PREP_MS 1 57 u8 identity[0]; /* length inferred from payload */ 58 } STRUCT_PACKED; 59 60 /* common routines */ 61 int compute_password_element(EAP_PWD_group *, u16, u8 *, int, u8 *, int, u8 *, 62 int, u8 *); 63 int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *, 64 u8 *, u8 *, u32 *, u8 *, u8 *); 65 void H_Init(HMAC_CTX *); 66 void H_Update(HMAC_CTX *, const u8 *, int); 67 void H_Final(HMAC_CTX *, u8 *); 68 69 #endif /* EAP_PWD_COMMON_H */ 70
