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/*
* EAP server/peer: EAP-pwd shared definitions
* Copyright (c) 2009, Dan Harkins <dharkins@lounge.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the BSD license.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation.
*
* See README and COPYING for more details.
*/
#ifndef EAP_PWD_COMMON_H
#define EAP_PWD_COMMON_H
#include <openssl/bn.h>
#include <openssl/sha.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
/*
* definition of a finite cyclic group
* TODO: support one based on a prime field
*/
typedef struct group_definition_ {
u16 group_num;
EC_GROUP *group;
EC_POINT *pwe;
BIGNUM *order;
BIGNUM *prime;
} EAP_PWD_group;
/*
* EAP-pwd header, included on all payloads
* L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set)
*/
#define EAP_PWD_HDR_SIZE 1
#define EAP_PWD_OPCODE_ID_EXCH 1
#define EAP_PWD_OPCODE_COMMIT_EXCH 2
#define EAP_PWD_OPCODE_CONFIRM_EXCH 3
#define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80)
#define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80)
#define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40)
#define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40)
#define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f)
#define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y))
/* EAP-pwd-ID payload */
struct eap_pwd_id {
be16 group_num;
u8 random_function;
#define EAP_PWD_DEFAULT_RAND_FUNC 1
u8 prf;
#define EAP_PWD_DEFAULT_PRF 1
u8 token[4];
u8 prep;
#define EAP_PWD_PREP_NONE 0
#define EAP_PWD_PREP_MS 1
u8 identity[0]; /* length inferred from payload */
} STRUCT_PACKED;
/* common routines */
int compute_password_element(EAP_PWD_group *, u16, u8 *, int, u8 *, int, u8 *,
int, u8 *);
int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *,
u8 *, u8 *, u32 *, u8 *, u8 *);
void H_Init(HMAC_CTX *);
void H_Update(HMAC_CTX *, const u8 *, int);
void H_Final(HMAC_CTX *, u8 *);
#endif /* EAP_PWD_COMMON_H */
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