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      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/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 *, u16, u8 *, int, u8 *, int, u8 *,
     60 			     int, u8 *);
     61 int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *,
     62 		 u8 *, u8 *, u32 *, u8 *, u8 *);
     63 struct crypto_hash * eap_pwd_h_init(void);
     64 void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len);
     65 void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest);
     66 
     67 #endif  /* EAP_PWD_COMMON_H */
     68