mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-29 18:58:21 -05:00
e4d7b22a53
The changes are:
1. the word "and" in the hunting-and-pecking string passed to the KDF
should be capitalized.
2. the primebitlen used in the KDF should be a short not an int.
3. the computation of MK in hostap is based on an older version of the
draft and is not the way it's specified in the RFC.
4. the group being passed into computation of the Commit was not in
network order.
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
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* EAP server/peer: EAP-pwd shared definitions
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* Copyright (c) 2009, Dan Harkins <dharkins@lounge.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the BSD license.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation.
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*
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* See README and COPYING for more details.
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*/
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#ifndef EAP_PWD_COMMON_H
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#define EAP_PWD_COMMON_H
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#include <openssl/bn.h>
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#include <openssl/sha.h>
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#include <openssl/ec.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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/*
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* definition of a finite cyclic group
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* TODO: support one based on a prime field
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*/
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typedef struct group_definition_ {
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u16 group_num;
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EC_GROUP *group;
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EC_POINT *pwe;
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BIGNUM *order;
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BIGNUM *prime;
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} EAP_PWD_group;
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/*
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* EAP-pwd header, included on all payloads
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*/
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struct eap_pwd_hdr {
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u8 l_bit:1;
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u8 m_bit:1;
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u8 exch:6;
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u8 total_length[0]; /* included when l_bit is set */
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} STRUCT_PACKED;
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#define EAP_PWD_OPCODE_ID_EXCH 1
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#define EAP_PWD_OPCODE_COMMIT_EXCH 2
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#define EAP_PWD_OPCODE_CONFIRM_EXCH 3
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#define EAP_PWD_GET_LENGTH_BIT(x) ((x)->lm_exch & 0x80)
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#define EAP_PWD_SET_LENGTH_BIT(x) ((x)->lm_exch |= 0x80)
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#define EAP_PWD_GET_MORE_BIT(x) ((x)->lm_exch & 0x40)
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#define EAP_PWD_SET_MORE_BIT(x) ((x)->lm_exch |= 0x40)
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#define EAP_PWD_GET_EXCHANGE(x) ((x)->lm_exch & 0x3f)
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#define EAP_PWD_SET_EXCHANGE(x,y) ((x)->lm_exch |= (y))
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/* EAP-pwd-ID payload */
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struct eap_pwd_id {
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be16 group_num;
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u8 random_function;
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#define EAP_PWD_DEFAULT_RAND_FUNC 1
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u8 prf;
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#define EAP_PWD_DEFAULT_PRF 1
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u8 token[4];
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u8 prep;
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#define EAP_PWD_PREP_NONE 0
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#define EAP_PWD_PREP_MS 1
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u8 identity[0]; /* length inferred from payload */
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} STRUCT_PACKED;
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/* common routines */
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int compute_password_element(EAP_PWD_group *, u16, u8 *, int, u8 *, int, u8 *,
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int, u8 *);
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int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *,
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u8 *, u8 *, u32 *, u8 *, u8 *);
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void H_Init(HMAC_CTX *);
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void H_Update(HMAC_CTX *, const u8 *, int);
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void H_Final(HMAC_CTX *, u8 *);
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#endif /* EAP_PWD_COMMON_H */
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