Example #1
0
static struct wpabuf * eap_sake_build_confirm(struct eap_sm *sm,
					      struct eap_sake_data *data,
					      u8 id)
{
	struct wpabuf *msg;
	u8 *mic;

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: Request/Confirm");

	msg = eap_sake_build_msg(data, id, 2 + EAP_SAKE_MIC_LEN,
				 EAP_SAKE_SUBTYPE_CONFIRM);
	if (msg == NULL) {
		data->state = FAILURE;
		return NULL;
	}

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: * AT_MIC_S");
	wpabuf_put_u8(msg, EAP_SAKE_AT_MIC_S);
	wpabuf_put_u8(msg, 2 + EAP_SAKE_MIC_LEN);
	mic = wpabuf_put(msg, EAP_SAKE_MIC_LEN);
	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 0,
				 wpabuf_head(msg), wpabuf_len(msg), mic, mic))
	{
		asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: Failed to compute MIC");
		data->state = FAILURE;
		os_free(msg);
		return NULL;
	}

	return msg;
}
Example #2
0
static struct wpabuf * eap_sake_build_identity(struct eap_sm *sm,
					       struct eap_sake_data *data,
					       u8 id)
{
	struct wpabuf *msg;
	size_t plen;

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: Request/Identity");

	plen = 4;
	if (data->serverid)
		plen += 2 + data->serverid_len;
	msg = eap_sake_build_msg(data, id, plen, EAP_SAKE_SUBTYPE_IDENTITY);
	if (msg == NULL) {
		data->state = FAILURE;
		return NULL;
	}

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: * AT_PERM_ID_REQ");
	eap_sake_add_attr(msg, EAP_SAKE_AT_PERM_ID_REQ, NULL, 2);

	if (data->serverid) {
		asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: * AT_SERVERID");
		eap_sake_add_attr(msg, EAP_SAKE_AT_SERVERID,
				  data->serverid, data->serverid_len);
	}

	return msg;
}
Example #3
0
static u8 * eap_sake_build_confirm(struct eap_sm *sm,
                                   struct eap_sake_data *data,
                                   int id, size_t *reqDataLen)
{
    u8 *msg, *pos;

    wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Confirm");

    *reqDataLen = 2 + EAP_SAKE_MIC_LEN;
    msg = eap_sake_build_msg(data, &pos, id, reqDataLen,
                             EAP_SAKE_SUBTYPE_CONFIRM);
    if (msg == NULL) {
        data->state = FAILURE;
        return NULL;
    }

    wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_S");
    *pos++ = EAP_SAKE_AT_MIC_S;
    *pos++ = 2 + EAP_SAKE_MIC_LEN;
    if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
                             data->serverid, data->serverid_len,
                             data->peerid, data->peerid_len, 0,
                             msg, *reqDataLen, pos, pos)) {
        wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
        data->state = FAILURE;
        os_free(msg);
        return NULL;
    }

    return msg;
}
Example #4
0
static u8 * eap_sake_build_identity(struct eap_sm *sm,
                                    struct eap_sake_data *data,
                                    int id, size_t *reqDataLen)
{
    u8 *msg, *pos;

    wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Identity");

    *reqDataLen = 4;
    if (data->serverid)
        *reqDataLen += 2 + data->serverid_len;
    msg = eap_sake_build_msg(data, &pos, id, reqDataLen,
                             EAP_SAKE_SUBTYPE_IDENTITY);
    if (msg == NULL) {
        data->state = FAILURE;
        return NULL;
    }

    wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PERM_ID_REQ");
    *pos++ = EAP_SAKE_AT_PERM_ID_REQ;
    *pos++ = 4;
    *pos++ = 0;
    *pos++ = 0;

    if (data->serverid) {
        wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_SERVERID");
        *pos++ = EAP_SAKE_AT_SERVERID;
        *pos++ = 2 + data->serverid_len;
        os_memcpy(pos, data->serverid, data->serverid_len);
    }

    return msg;
}
static u8 * eap_sake_process_identity(struct eap_sm *sm,
				      struct eap_sake_data *data,
				      struct eap_method_ret *ret,
				      const u8 *reqData, size_t reqDataLen,
				      const u8 *payload, size_t payload_len,
				      size_t *respDataLen)
{
	struct eap_sake_parse_attr attr;
	u8 *resp, *rpos;
	const struct eap_hdr *hdr = (const struct eap_hdr *) reqData;

	if (data->state != IDENTITY) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Identity");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.perm_id_req && !attr.any_id_req) {
		wpa_printf(MSG_INFO, "EAP-SAKE: No AT_PERM_ID_REQ or "
			   "AT_ANY_ID_REQ in Request/Identity");
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Identity");

	*respDataLen = 2 + data->peerid_len;
	resp = eap_sake_build_msg(data, &rpos, hdr->identifier, respDataLen,
				  EAP_SAKE_SUBTYPE_IDENTITY);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
	*rpos++ = EAP_SAKE_AT_PEERID;
	*rpos++ = 2 + data->peerid_len;
	if (data->peerid)
		os_memcpy(rpos, data->peerid, data->peerid_len);

	eap_sake_state(data, CHALLENGE);

	return resp;
}
Example #6
0
static struct wpabuf * eap_sake_process_identity(struct eap_sm *sm,
						 struct eap_sake_data *data,
						 struct eap_method_ret *ret,
						 const struct wpabuf *reqData,
						 const u8 *payload,
						 size_t payload_len)
{
	struct eap_sake_parse_attr attr;
	struct wpabuf *resp;

	if (data->state != IDENTITY) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Identity");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.perm_id_req && !attr.any_id_req) {
		wpa_printf(MSG_INFO, "EAP-SAKE: No AT_PERM_ID_REQ or "
			   "AT_ANY_ID_REQ in Request/Identity");
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Identity");

	resp = eap_sake_build_msg(data, eap_get_id(reqData),
				  2 + data->peerid_len,
				  EAP_SAKE_SUBTYPE_IDENTITY);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
	eap_sake_add_attr(resp, EAP_SAKE_AT_PEERID,
			  data->peerid, data->peerid_len);

	eap_sake_state(data, CHALLENGE);

	return resp;
}
Example #7
0
static u8 * eap_sake_build_challenge(struct eap_sm *sm,
				     struct eap_sake_data *data,
				     int id, size_t *reqDataLen)
{
	u8 *msg, *pos;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Challenge");

	if (hostapd_get_rand(data->rand_s, EAP_SAKE_RAND_LEN)) {
		wpa_printf(MSG_ERROR, "EAP-SAKE: Failed to get random data");
		data->state = FAILURE;
		return NULL;
	}
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_S (server rand)",
		    data->rand_s, EAP_SAKE_RAND_LEN);

	*reqDataLen = 2 + EAP_SAKE_RAND_LEN;
	if (data->serverid)
		*reqDataLen += 2 + data->serverid_len;
	msg = eap_sake_build_msg(data, &pos, id, reqDataLen,
				 EAP_SAKE_SUBTYPE_CHALLENGE);
	if (msg == NULL) {
		data->state = FAILURE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_RAND_S");
	*pos++ = EAP_SAKE_AT_RAND_S;
	*pos++ = 2 + EAP_SAKE_RAND_LEN;
	os_memcpy(pos, data->rand_s, EAP_SAKE_RAND_LEN);
	pos += EAP_SAKE_RAND_LEN;

	if (data->serverid) {
		wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_SERVERID");
		*pos++ = EAP_SAKE_AT_SERVERID;
		*pos++ = 2 + data->serverid_len;
		os_memcpy(pos, data->serverid, data->serverid_len);
	}
	(void)sm;

	return msg;
}
Example #8
0
static struct wpabuf * eap_sake_build_challenge(struct eap_sm *sm,
						struct eap_sake_data *data,
						u8 id)
{
	struct wpabuf *msg;
	size_t plen;

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: Request/Challenge");

	if (os_get_random(data->rand_s, EAP_SAKE_RAND_LEN)) {
		asd_printf(ASD_DEFAULT,MSG_ERROR, "EAP-SAKE: Failed to get random data");
		data->state = FAILURE;
		return NULL;
	}
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_S (server rand)",
		    data->rand_s, EAP_SAKE_RAND_LEN);

	plen = 2 + EAP_SAKE_RAND_LEN;
	if (data->serverid)
		plen += 2 + data->serverid_len;
	msg = eap_sake_build_msg(data, id, plen, EAP_SAKE_SUBTYPE_CHALLENGE);
	if (msg == NULL) {
		data->state = FAILURE;
		return NULL;
	}

	asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: * AT_RAND_S");
	eap_sake_add_attr(msg, EAP_SAKE_AT_RAND_S,
			  data->rand_s, EAP_SAKE_RAND_LEN);

	if (data->serverid) {
		asd_printf(ASD_DEFAULT,MSG_DEBUG, "EAP-SAKE: * AT_SERVERID");
		eap_sake_add_attr(msg, EAP_SAKE_AT_SERVERID,
				  data->serverid, data->serverid_len);
	}

	return msg;
}
Example #9
0
static struct wpabuf * eap_sake_process_confirm(struct eap_sm *sm,
						struct eap_sake_data *data,
						struct eap_method_ret *ret,
						u8 id,
						const struct wpabuf *reqData,
						const u8 *payload,
						size_t payload_len)
{
	struct eap_sake_parse_attr attr;
	u8 mic_s[EAP_SAKE_MIC_LEN];
	struct wpabuf *resp;
	u8 *rpos;

	if (data->state != CONFIRM) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Confirm");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.mic_s) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Request/Confirm did not "
			   "include AT_MIC_S");
		return NULL;
	}

	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 0,
				 wpabuf_head(reqData), wpabuf_len(reqData),
				 attr.mic_s, mic_s)) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
		eap_sake_state(data, FAILURE);
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		ret->allowNotifications = FALSE;
		wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Auth-Reject");
		return eap_sake_build_msg(data, id, 0,
					  EAP_SAKE_SUBTYPE_AUTH_REJECT);
	}
	if (os_memcmp_const(attr.mic_s, mic_s, EAP_SAKE_MIC_LEN) != 0) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Incorrect AT_MIC_S");
		eap_sake_state(data, FAILURE);
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		ret->allowNotifications = FALSE;
		wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending "
			   "Response/Auth-Reject");
		return eap_sake_build_msg(data, id, 0,
					  EAP_SAKE_SUBTYPE_AUTH_REJECT);
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Confirm");

	resp = eap_sake_build_msg(data, id, 2 + EAP_SAKE_MIC_LEN,
				  EAP_SAKE_SUBTYPE_CONFIRM);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
	wpabuf_put_u8(resp, EAP_SAKE_AT_MIC_P);
	wpabuf_put_u8(resp, 2 + EAP_SAKE_MIC_LEN);
	rpos = wpabuf_put(resp, EAP_SAKE_MIC_LEN);
	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 1,
				 wpabuf_head(resp), wpabuf_len(resp), rpos,
				 rpos)) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
		wpabuf_free(resp);
		return NULL;
	}

	eap_sake_state(data, SUCCESS);
	ret->methodState = METHOD_DONE;
	ret->decision = DECISION_UNCOND_SUCC;
	ret->allowNotifications = FALSE;

	return resp;
}
Example #10
0
static struct wpabuf * eap_sake_process_challenge(struct eap_sm *sm,
						  struct eap_sake_data *data,
						  struct eap_method_ret *ret,
						  u8 id,
						  const u8 *payload,
						  size_t payload_len)
{
	struct eap_sake_parse_attr attr;
	struct wpabuf *resp;
	u8 *rpos;
	size_t rlen;

	if (data->state != IDENTITY && data->state != CHALLENGE) {
		wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Challenge received "
			   "in unexpected state (%d)", data->state);
		ret->ignore = TRUE;
		return NULL;
	}
	if (data->state == IDENTITY)
		eap_sake_state(data, CHALLENGE);

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Challenge");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.rand_s) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Request/Challenge did not "
			   "include AT_RAND_S");
		return NULL;
	}

	os_memcpy(data->rand_s, attr.rand_s, EAP_SAKE_RAND_LEN);
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_S (server rand)",
		    data->rand_s, EAP_SAKE_RAND_LEN);

	if (random_get_bytes(data->rand_p, EAP_SAKE_RAND_LEN)) {
		wpa_printf(MSG_ERROR, "EAP-SAKE: Failed to get random data");
		return NULL;
	}
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_P (peer rand)",
		    data->rand_p, EAP_SAKE_RAND_LEN);

	os_free(data->serverid);
	data->serverid = NULL;
	data->serverid_len = 0;
	if (attr.serverid) {
		wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-SAKE: SERVERID",
				  attr.serverid, attr.serverid_len);
		data->serverid = os_malloc(attr.serverid_len);
		if (data->serverid == NULL)
			return NULL;
		os_memcpy(data->serverid, attr.serverid, attr.serverid_len);
		data->serverid_len = attr.serverid_len;
	}

	eap_sake_derive_keys(data->root_secret_a, data->root_secret_b,
			     data->rand_s, data->rand_p,
			     (u8 *) &data->tek, data->msk, data->emsk);

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Challenge");

	rlen = 2 + EAP_SAKE_RAND_LEN + 2 + EAP_SAKE_MIC_LEN;
	if (data->peerid)
		rlen += 2 + data->peerid_len;
	resp = eap_sake_build_msg(data, id, rlen, EAP_SAKE_SUBTYPE_CHALLENGE);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_RAND_P");
	eap_sake_add_attr(resp, EAP_SAKE_AT_RAND_P,
			  data->rand_p, EAP_SAKE_RAND_LEN);

	if (data->peerid) {
		wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
		eap_sake_add_attr(resp, EAP_SAKE_AT_PEERID,
				  data->peerid, data->peerid_len);
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
	wpabuf_put_u8(resp, EAP_SAKE_AT_MIC_P);
	wpabuf_put_u8(resp, 2 + EAP_SAKE_MIC_LEN);
	rpos = wpabuf_put(resp, EAP_SAKE_MIC_LEN);
	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 1,
				 wpabuf_head(resp), wpabuf_len(resp), rpos,
				 rpos)) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
		wpabuf_free(resp);
		return NULL;
	}

	eap_sake_state(data, CONFIRM);

	return resp;
}
static u8 * eap_sake_process_confirm(struct eap_sm *sm,
				     struct eap_sake_data *data,
				     struct eap_method_ret *ret,
				     const u8 *reqData, size_t reqDataLen,
				     const u8 *payload, size_t payload_len,
				     size_t *respDataLen)
{
	struct eap_sake_parse_attr attr;
	u8 mic_s[EAP_SAKE_MIC_LEN];
	u8 *resp, *rpos;
	const struct eap_hdr *hdr = (const struct eap_hdr *) reqData;

	if (data->state != CONFIRM) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Confirm");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.mic_s) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Request/Confirm did not "
			   "include AT_MIC_S");
		return NULL;
	}

	eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
			     data->serverid, data->serverid_len,
			     data->peerid, data->peerid_len, 0,
			     reqData, reqDataLen, attr.mic_s, mic_s);
	if (os_memcmp(attr.mic_s, mic_s, EAP_SAKE_MIC_LEN) != 0) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Incorrect AT_MIC_S");
		eap_sake_state(data, FAILURE);
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		ret->allowNotifications = FALSE;
		*respDataLen = 0;
		wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending "
			   "Response/Auth-Reject");
		return eap_sake_build_msg(data, &rpos, hdr->identifier,
					  respDataLen,
					  EAP_SAKE_SUBTYPE_AUTH_REJECT);
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Confirm");

	*respDataLen = 2 + EAP_SAKE_MIC_LEN;
	resp = eap_sake_build_msg(data, &rpos, hdr->identifier, respDataLen,
				  EAP_SAKE_SUBTYPE_CONFIRM);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
	*rpos++ = EAP_SAKE_AT_MIC_P;
	*rpos++ = 2 + EAP_SAKE_MIC_LEN;
	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 1,
				 resp, *respDataLen, rpos, rpos)) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
		os_free(resp);
		return NULL;
	}

	eap_sake_state(data, SUCCESS);
	ret->methodState = METHOD_DONE;
	ret->decision = DECISION_UNCOND_SUCC;
	ret->allowNotifications = FALSE;

	return resp;
}
static u8 * eap_sake_process_challenge(struct eap_sm *sm,
				       struct eap_sake_data *data,
				       struct eap_method_ret *ret,
				       const u8 *reqData, size_t reqDataLen,
				       const u8 *payload, size_t payload_len,
				       size_t *respDataLen)
{
	struct eap_sake_parse_attr attr;
	u8 *resp, *rpos;
	const struct eap_hdr *hdr = (const struct eap_hdr *) reqData;

	if (data->state != IDENTITY && data->state != CHALLENGE) {
		wpa_printf(MSG_DEBUG, "EAP-SAKE: Request/Challenge received "
			   "in unexpected state (%d)", data->state);
		ret->ignore = TRUE;
		return NULL;
	}
	if (data->state == IDENTITY)
		eap_sake_state(data, CHALLENGE);

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Received Request/Challenge");

	if (eap_sake_parse_attributes(payload, payload_len, &attr))
		return NULL;

	if (!attr.rand_s) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Request/Challenge did not "
			   "include AT_RAND_S");
		return NULL;
	}

	os_memcpy(data->rand_s, attr.rand_s, EAP_SAKE_RAND_LEN);
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_S (server rand)",
		    data->rand_s, EAP_SAKE_RAND_LEN);

	if (hostapd_get_rand(data->rand_p, EAP_SAKE_RAND_LEN)) {
		wpa_printf(MSG_ERROR, "EAP-SAKE: Failed to get random data");
		return NULL;
	}
	wpa_hexdump(MSG_MSGDUMP, "EAP-SAKE: RAND_P (peer rand)",
		    data->rand_p, EAP_SAKE_RAND_LEN);

	os_free(data->serverid);
	data->serverid = NULL;
	data->serverid_len = 0;
	if (attr.serverid) {
		wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-SAKE: SERVERID",
				  attr.serverid, attr.serverid_len);
		data->serverid = os_malloc(attr.serverid_len);
		if (data->serverid == NULL)
			return NULL;
		os_memcpy(data->serverid, attr.serverid, attr.serverid_len);
		data->serverid_len = attr.serverid_len;
	}

	eap_sake_derive_keys(data->root_secret_a, data->root_secret_b,
			     data->rand_s, data->rand_p,
			     (u8 *) &data->tek, data->msk, data->emsk);

	wpa_printf(MSG_DEBUG, "EAP-SAKE: Sending Response/Challenge");

	*respDataLen = 2 + EAP_SAKE_RAND_LEN + 2 + EAP_SAKE_MIC_LEN;
	if (data->peerid)
		*respDataLen += 2 + data->peerid_len;
	resp = eap_sake_build_msg(data, &rpos, hdr->identifier, respDataLen,
				  EAP_SAKE_SUBTYPE_CHALLENGE);
	if (resp == NULL)
		return NULL;

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_RAND_P");
	*rpos++ = EAP_SAKE_AT_RAND_P;
	*rpos++ = 2 + EAP_SAKE_RAND_LEN;
	os_memcpy(rpos, data->rand_p, EAP_SAKE_RAND_LEN);
	rpos += EAP_SAKE_RAND_LEN;

	if (data->peerid) {
		wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_PEERID");
		*rpos++ = EAP_SAKE_AT_PEERID;
		*rpos++ = 2 + data->peerid_len;
		os_memcpy(rpos, data->peerid, data->peerid_len);
		rpos += data->peerid_len;
	}

	wpa_printf(MSG_DEBUG, "EAP-SAKE: * AT_MIC_P");
	*rpos++ = EAP_SAKE_AT_MIC_P;
	*rpos++ = 2 + EAP_SAKE_MIC_LEN;
	if (eap_sake_compute_mic(data->tek.auth, data->rand_s, data->rand_p,
				 data->serverid, data->serverid_len,
				 data->peerid, data->peerid_len, 1,
				 resp, *respDataLen, rpos, rpos)) {
		wpa_printf(MSG_INFO, "EAP-SAKE: Failed to compute MIC");
		os_free(resp);
		return NULL;
	}

	eap_sake_state(data, CONFIRM);

	return resp;
}