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authorJouni Malinen <j@w1.fi>2012-09-08 13:32:35 (GMT)
committerJouni Malinen <j@w1.fi>2012-09-08 14:08:53 (GMT)
commita9eae7efe30b4f2616602b6d2f6198dfd3407074 (patch)
tree902522250fec9832c7db4ccd26455b76f2467ebf /wlantest/bip.c
parent6522984086f6d5c4c0b62bdaf2979fc9173b1485 (diff)
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wlantest: Move BIP function into a separate function and file
Signed-hostap: Jouni Malinen <j@w1.fi>
Diffstat (limited to 'wlantest/bip.c')
-rw-r--r--wlantest/bip.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/wlantest/bip.c b/wlantest/bip.c
new file mode 100644
index 0000000..a239d49
--- /dev/null
+++ b/wlantest/bip.c
@@ -0,0 +1,67 @@
+/*
+ * BIP
+ * Copyright (c) 2010-2012, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "common/ieee802_11_defs.h"
+#include "crypto/aes_wrap.h"
+#include "wlantest.h"
+
+
+u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
+ size_t *prot_len)
+{
+ u8 *prot, *pos, *buf;
+ u8 mic[16];
+ u16 fc;
+ struct ieee80211_hdr *hdr;
+ size_t plen;
+
+ plen = len + 18;
+ prot = os_malloc(plen);
+ if (prot == NULL)
+ return NULL;
+ os_memcpy(prot, frame, len);
+ pos = prot + len;
+ *pos++ = WLAN_EID_MMIE;
+ *pos++ = 16;
+ WPA_PUT_LE16(pos, keyid);
+ pos += 2;
+ os_memcpy(pos, ipn, 6);
+ pos += 6;
+ os_memset(pos, 0, 8); /* MIC */
+
+ buf = os_malloc(plen + 20 - 24);
+ if (buf == NULL) {
+ os_free(prot);
+ return NULL;
+ }
+
+ /* BIP AAD: FC(masked) A1 A2 A3 */
+ hdr = (struct ieee80211_hdr *) frame;
+ fc = le_to_host16(hdr->frame_control);
+ fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
+ WPA_PUT_LE16(buf, fc);
+ os_memcpy(buf + 2, hdr->addr1, 3 * ETH_ALEN);
+ os_memcpy(buf + 20, prot + 24, plen - 24);
+ wpa_hexdump(MSG_MSGDUMP, "BIP: AAD|Body(masked)", buf, plen + 20 - 24);
+ /* MIC = L(AES-128-CMAC(AAD || Frame Body(masked)), 0, 64) */
+ if (omac1_aes_128(igtk, buf, plen + 20 - 24, mic) < 0) {
+ os_free(prot);
+ os_free(buf);
+ return NULL;
+ }
+ os_free(buf);
+
+ os_memcpy(pos, mic, 8);
+ wpa_hexdump(MSG_DEBUG, "BIP MMIE MIC", pos, 8);
+
+ *prot_len = plen;
+ return prot;
+}