65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
|
|
* EAP server/peer: EAP-PSK shared routines
|
|
* Copyright (c) 2004-2006, 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.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include "common.h"
|
|
#include "aes_wrap.h"
|
|
#include "eap_defs.h"
|
|
#include "eap_psk_common.h"
|
|
|
|
#define aes_block_size 16
|
|
|
|
|
|
void eap_psk_key_setup(const u8 *psk, u8 *ak, u8 *kdk)
|
|
{
|
|
os_memset(ak, 0, aes_block_size);
|
|
aes_128_encrypt_block(psk, ak, ak);
|
|
os_memcpy(kdk, ak, aes_block_size);
|
|
ak[aes_block_size - 1] ^= 0x01;
|
|
kdk[aes_block_size - 1] ^= 0x02;
|
|
aes_128_encrypt_block(psk, ak, ak);
|
|
aes_128_encrypt_block(psk, kdk, kdk);
|
|
}
|
|
|
|
|
|
void eap_psk_derive_keys(const u8 *kdk, const u8 *rand_p, u8 *tek, u8 *msk,
|
|
u8 *emsk)
|
|
{
|
|
u8 hash[aes_block_size];
|
|
u8 counter = 1;
|
|
int i;
|
|
|
|
aes_128_encrypt_block(kdk, rand_p, hash);
|
|
|
|
hash[aes_block_size - 1] ^= counter;
|
|
aes_128_encrypt_block(kdk, hash, tek);
|
|
hash[aes_block_size - 1] ^= counter;
|
|
counter++;
|
|
|
|
for (i = 0; i < EAP_MSK_LEN / aes_block_size; i++) {
|
|
hash[aes_block_size - 1] ^= counter;
|
|
aes_128_encrypt_block(kdk, hash, &msk[i * aes_block_size]);
|
|
hash[aes_block_size - 1] ^= counter;
|
|
counter++;
|
|
}
|
|
|
|
for (i = 0; i < EAP_EMSK_LEN / aes_block_size; i++) {
|
|
hash[aes_block_size - 1] ^= counter;
|
|
aes_128_encrypt_block(kdk, hash, &emsk[i * aes_block_size]);
|
|
hash[aes_block_size - 1] ^= counter;
|
|
counter++;
|
|
}
|
|
}
|