3 * Copyright (c) 2010-2012, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "common/ieee802_11_defs.h"
13 #include "crypto/aes_wrap.h"
17 u8 * bip_protect(const u8 *igtk, size_t igtk_len, u8 *frame, size_t len,
18 u8 *ipn, int keyid, size_t *prot_len)
23 struct ieee80211_hdr *hdr;
26 plen = len + igtk_len == 32 ? 26 : 18;
27 prot = os_malloc(plen);
30 os_memcpy(prot, frame, len);
32 *pos++ = WLAN_EID_MMIE;
33 *pos++ = igtk_len == 32 ? 24 : 16;
34 WPA_PUT_LE16(pos, keyid);
36 os_memcpy(pos, ipn, 6);
38 os_memset(pos, 0, igtk_len == 32 ? 16 : 8); /* MIC */
40 buf = os_malloc(plen + 20 - 24);
46 /* BIP AAD: FC(masked) A1 A2 A3 */
47 hdr = (struct ieee80211_hdr *) frame;
48 fc = le_to_host16(hdr->frame_control);
49 fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
50 WPA_PUT_LE16(buf, fc);
51 os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
52 os_memcpy(buf + 20, prot + 24, plen - 24);
53 wpa_hexdump(MSG_MSGDUMP, "BIP: AAD|Body(masked)", buf, plen + 20 - 24);
54 /* MIC = L(AES-128-CMAC(AAD || Frame Body(masked)), 0, 64) */
55 if (omac1_aes_128(igtk, buf, plen + 20 - 24, mic) < 0) {
62 os_memcpy(pos, mic, igtk_len == 32 ? 16 : 8);
63 wpa_hexdump(MSG_DEBUG, "BIP MMIE MIC", pos, igtk_len == 32 ? 16 : 8);
70 u8 * bip_gmac_protect(const u8 *igtk, size_t igtk_len, u8 *frame, size_t len,
71 u8 *ipn, int keyid, size_t *prot_len)
75 struct ieee80211_hdr *hdr;
80 prot = os_malloc(plen);
83 os_memcpy(prot, frame, len);
85 *pos++ = WLAN_EID_MMIE;
87 WPA_PUT_LE16(pos, keyid);
89 os_memcpy(pos, ipn, 6);
91 os_memset(pos, 0, 16); /* MIC */
93 buf = os_malloc(plen + 20 - 24);
99 /* BIP AAD: FC(masked) A1 A2 A3 */
100 hdr = (struct ieee80211_hdr *) frame;
101 fc = le_to_host16(hdr->frame_control);
102 fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
103 WPA_PUT_LE16(buf, fc);
104 os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
105 os_memcpy(buf + 20, prot + 24, plen - 24);
106 wpa_hexdump(MSG_MSGDUMP, "BIP-GMAC: AAD|Body(masked)",
107 buf, plen + 20 - 24);
109 /* Nonce: A2 | IPN */
110 os_memcpy(nonce, hdr->addr2, ETH_ALEN);
111 npos = nonce + ETH_ALEN;
118 wpa_hexdump(MSG_EXCESSIVE, "BIP-GMAC: Nonce", nonce, sizeof(nonce));
120 /* MIC = AES-GMAC(AAD || Frame Body(masked)) */
121 if (aes_gmac(igtk, igtk_len, nonce, sizeof(nonce),
122 buf, plen + 20 - 24, pos) < 0) {
129 wpa_hexdump(MSG_DEBUG, "BIP-GMAC MMIE MIC", pos, 16);