int wps_derive_keys(struct wps_data *wps)
{
struct wpabuf *pubkey, *dh_shared;
u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
const u8 *addr[3];
size_t len[3];
u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
if (wps->dh_privkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
return -1;
}
pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
if (pubkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
return -1;
}
wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
wpa_hexdump_buf(MSG_DEBUG, "WPS: DH peer Public Key", pubkey);
dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
dh5_free(wps->dh_ctx);
wps->dh_ctx = NULL;
dh_shared = wpabuf_zeropad(dh_shared, 192);
if (dh_shared == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
return -1;
}
/* Own DH private key is not needed anymore */
wpabuf_free(wps->dh_privkey);
wps->dh_privkey = NULL;
wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
/* DHKey = SHA-256(g^AB mod p) */
addr[0] = wpabuf_head(dh_shared);
len[0] = wpabuf_len(dh_shared);
sha256_vector(1, addr, len, dhkey);
wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
wpabuf_free(dh_shared);
/* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
addr[0] = wps->nonce_e;
len[0] = WPS_NONCE_LEN;
addr[1] = wps->mac_addr_e;
len[1] = ETH_ALEN;
addr[2] = wps->nonce_r;
len[2] = WPS_NONCE_LEN;
hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
keys, sizeof(keys));
os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
WPS_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
wps->authkey, WPS_AUTHKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
return 0;
}
int wps_derive_keys(struct wps_data *wps)
{
struct wpabuf *pubkey, *dh_shared;
u8 dhkey[SHA256_MAC_LEN], kdk[SHA256_MAC_LEN];
const u8 *addr[3];
size_t len[3];
u8 keys[WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN + WPS_EMSK_LEN];
if (wps->dh_privkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Own DH private key not available");
return -1;
}
pubkey = wps->registrar ? wps->dh_pubkey_e : wps->dh_pubkey_r;
if (pubkey == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Peer DH public key not available");
return -1;
}
dh_shared = dh5_derive_shared(wps->dh_ctx, pubkey, wps->dh_privkey);
dh5_free(wps->dh_ctx);
wps->dh_ctx = NULL;
dh_shared = wpabuf_zeropad(dh_shared, 192);
if (dh_shared == NULL) {
wpa_printf(MSG_DEBUG, "WPS: Failed to derive DH shared key");
return -1;
}
/* Own DH private key is not needed anymore */
wpabuf_free(wps->dh_privkey);
wps->dh_privkey = NULL;
wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH shared key", dh_shared);
/* DHKey = SHA-256(g^AB mod p) */
addr[0] = wpabuf_head(dh_shared);
len[0] = wpabuf_len(dh_shared);
sha256_vector(1, addr, len, dhkey);
wpa_hexdump_key(MSG_DEBUG, "WPS: DHKey", dhkey, sizeof(dhkey));
wpabuf_free(dh_shared);
/* KDK = HMAC-SHA-256_DHKey(N1 || EnrolleeMAC || N2) */
addr[0] = wps->nonce_e;
len[0] = WPS_NONCE_LEN;
addr[1] = wps->mac_addr_e;
len[1] = ETH_ALEN;
addr[2] = wps->nonce_r;
len[2] = WPS_NONCE_LEN;
hmac_sha256_vector(dhkey, sizeof(dhkey), 3, addr, len, kdk);
wpa_hexdump_key(MSG_DEBUG, "WPS: KDK", kdk, sizeof(kdk));
wps_kdf(kdk, NULL, 0, "Wi-Fi Easy and Secure Key Derivation",
keys, sizeof(keys));
os_memcpy(wps->authkey, keys, WPS_AUTHKEY_LEN);
os_memcpy(wps->keywrapkey, keys + WPS_AUTHKEY_LEN, WPS_KEYWRAPKEY_LEN);
os_memcpy(wps->emsk, keys + WPS_AUTHKEY_LEN + WPS_KEYWRAPKEY_LEN,
WPS_EMSK_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: AuthKey",
wps->authkey, WPS_AUTHKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: KeyWrapKey",
wps->keywrapkey, WPS_KEYWRAPKEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "WPS: EMSK", wps->emsk, WPS_EMSK_LEN);
/****** ADD THIS PART ******/
memset(pixie_authkey,0,sizeof(pixie_authkey));
if ( get_debug()==4 )
{ //verbose (-vvv)
printf("[P] AuthKey: ");
}
int pixiecnt = 0;
for (; pixiecnt < WPS_AUTHKEY_LEN; pixiecnt++) {
if ( get_debug()==4 )
{ //verbose (-vvv)
printf("%02x", wps->authkey[pixiecnt]);
}
sprintf(cmd_pixie_aux, "%02x", wps->authkey[pixiecnt]);
strcat(pixie_authkey, cmd_pixie_aux);
if (pixiecnt != WPS_AUTHKEY_LEN - 1) {
if ( get_debug()==4 )
{ //verbose (-vvv)
printf(":");
}
strcat(pixie_authkey,":");
}
}
if ( get_debug()==4 )
{ //verbose (-vvv)
printf("\n");
}
/******/
return 0;
}