/*
 * EAP server/peer: EAP-SAKE shared routines
 * Copyright (c) 2006, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#ifndef EAP_SAKE_COMMON_H
#define EAP_SAKE_COMMON_H

#define EAP_SAKE_VERSION 2

#define EAP_SAKE_SUBTYPE_CHALLENGE 1
#define EAP_SAKE_SUBTYPE_CONFIRM 2
#define EAP_SAKE_SUBTYPE_AUTH_REJECT 3
#define EAP_SAKE_SUBTYPE_IDENTITY 4

#define EAP_SAKE_AT_RAND_S 1
#define EAP_SAKE_AT_RAND_P 2
#define EAP_SAKE_AT_MIC_S 3
#define EAP_SAKE_AT_MIC_P 4
#define EAP_SAKE_AT_SERVERID 5
#define EAP_SAKE_AT_PEERID 6
#define EAP_SAKE_AT_SPI_S 7
#define EAP_SAKE_AT_SPI_P 8
#define EAP_SAKE_AT_ANY_ID_REQ 9
#define EAP_SAKE_AT_PERM_ID_REQ 10
#define EAP_SAKE_AT_ENCR_DATA 128
#define EAP_SAKE_AT_IV 129
#define EAP_SAKE_AT_PADDING 130
#define EAP_SAKE_AT_NEXT_TMPID 131
#define EAP_SAKE_AT_MSK_LIFE 132

#define EAP_SAKE_RAND_LEN 16
#define EAP_SAKE_MIC_LEN 16
#define EAP_SAKE_ROOT_SECRET_LEN 16
#define EAP_SAKE_SMS_LEN 16
#define EAP_SAKE_TEK_AUTH_LEN 16
#define EAP_SAKE_TEK_CIPHER_LEN 16
#define EAP_SAKE_TEK_LEN (EAP_SAKE_TEK_AUTH_LEN + EAP_SAKE_TEK_CIPHER_LEN)

#ifdef _MSC_VER
#pragma pack(push, 1)
#endif /* _MSC_VER */

struct eap_sake_hdr {
	u8 code;
	u8 identifier;
	u16 length;
	u8 type; /* EAP_TYPE_SAKE */
	u8 version; /* EAP_SAKE_VERSION */
	u8 session_id;
	u8 subtype;
} STRUCT_PACKED;

#ifdef _MSC_VER
#pragma pack(pop)
#endif /* _MSC_VER */


struct eap_sake_parse_attr {
	const u8 *rand_s;
	const u8 *rand_p;
	const u8 *mic_s;
	const u8 *mic_p;
	const u8 *serverid;
	size_t serverid_len;
	const u8 *peerid;
	size_t peerid_len;
	const u8 *spi_s;
	size_t spi_s_len;
	const u8 *spi_p;
	size_t spi_p_len;
	const u8 *any_id_req;
	const u8 *perm_id_req;
	const u8 *encr_data;
	size_t encr_data_len;
	const u8 *iv;
	size_t iv_len;
	const u8 *next_tmpid;
	size_t next_tmpid_len;
	const u8 *msk_life;
};

int eap_sake_parse_attributes(const u8 *buf, size_t len,
			      struct eap_sake_parse_attr *attr);
void eap_sake_derive_keys(const u8 *root_secret_a, const u8 *root_secret_b,
			  const u8 *rand_s, const u8 *rand_p,
			  u8 *tek, u8 *msk, u8 *emsk);
int eap_sake_compute_mic(const u8 *tek_auth,
			 const u8 *rand_s, const u8 *rand_p,
			 const u8 *serverid, size_t serverid_len,
			 const u8 *peerid, size_t peerid_len,
			 int peer, const u8 *eap, size_t eap_len,
			 const u8 *mic_pos, u8 *mic);

#endif /* EAP_SAKE_COMMON_H */