79 lines
2.2 KiB
C
79 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 *, EC_POINT *, EC_POINT *,
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BIGNUM *, BIGNUM *, 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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