/**
* eap_pax_initial_key_derivation - EAP-PAX initial key derivation
* @mac_id: MAC ID (EAP_PAX_MAC_*) / currently, only HMAC_SHA1_128 is supported
* @ak: Authentication Key
* @e: Entropy
* @mk: Buffer for the derived Master Key
* @ck: Buffer for the derived Confirmation Key
* @ick: Buffer for the derived Integrity Check Key
* Returns: 0 on success, -1 on failure
*/
int eap_pax_initial_key_derivation(u8 mac_id, const u8 *ak, const u8 *e,
u8 *mk, u8 *ck, u8 *ick)
{
wpa_printf(MSG_DEBUG, "EAP-PAX: initial key derivation");
if (eap_pax_kdf(mac_id, ak, EAP_PAX_AK_LEN, "Master Key",
e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_MK_LEN, mk) ||
eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Confirmation Key",
e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_CK_LEN, ck) ||
eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Integrity Check Key",
e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_ICK_LEN, ick))
return -1;
wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: AK", ak, EAP_PAX_AK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: MK", mk, EAP_PAX_MK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: CK", ck, EAP_PAX_CK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: ICK", ick, EAP_PAX_ICK_LEN);
return 0;
}
static u8 * eap_pax_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_pax_data *data = priv;
u8 *key;
if (data->state != SUCCESS)
return NULL;
key = os_malloc(EAP_MSK_LEN);
if (key == NULL)
return NULL;
*len = EAP_MSK_LEN;
eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN,
"Master Session Key", data->rand.e, 2 * EAP_PAX_RAND_LEN,
EAP_MSK_LEN, key);
return key;
}
static u8 *eap_pax_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_pax_data *data = priv;
u8 *key;
if (data->state != PAX_DONE) {
return NULL;
}
key = os_malloc(EAP_EMSK_LEN);
if (key == NULL) {
return NULL;
}
*len = EAP_EMSK_LEN;
eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN, "Extended Master Session Key", data->rand.e, 2 * EAP_PAX_RAND_LEN, EAP_EMSK_LEN, key);
return key;
}