--- /dev/null
+/*
+ * CTR with CBC-MAC Protocol (CCMP)
+ * 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.h"
+#include "crypto/aes_wrap.h"
+#include "wlantest.h"
+
+
+static void ccmp_aad_nonce(const struct ieee80211_hdr *hdr, const u8 *data,
+ u8 *aad, size_t *aad_len, u8 *nonce)
+{
+ u16 fc, stype, seq;
+ int qos = 0, addr4 = 0;
+ u8 *pos;
+
+ nonce[0] = 0;
+
+ fc = le_to_host16(hdr->frame_control);
+ stype = WLAN_FC_GET_STYPE(fc);
+ if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
+ (WLAN_FC_TODS | WLAN_FC_FROMDS))
+ addr4 = 1;
+
+ if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) {
+ fc &= ~0x0070; /* Mask subtype bits */
+ if (stype & 0x08) {
+ const u8 *qc;
+ qos = 1;
+ fc &= ~WLAN_FC_ORDER;
+ qc = (const u8 *) (hdr + 1);
+ if (addr4)
+ qc += ETH_ALEN;
+ nonce[0] = qc[0] & 0x0f;
+ }
+ } else if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
+ nonce[0] |= 0x10; /* Management */
+
+ fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
+ fc |= WLAN_FC_ISWEP;
+ WPA_PUT_LE16(aad, fc);
+ pos = aad + 2;
+ os_memcpy(pos, hdr->addr1, 3 * ETH_ALEN);
+ pos += 3 * ETH_ALEN;
+ seq = le_to_host16(hdr->seq_ctrl);
+ seq &= ~0xfff0; /* Mask Seq#; do not modify Frag# */
+ WPA_PUT_LE16(pos, seq);
+ pos += 2;
+
+ os_memcpy(pos, hdr + 1, addr4 * ETH_ALEN + qos * 2);
+ pos += addr4 * ETH_ALEN;
+ if (qos) {
+ pos[0] &= ~0x70;
+ if (1 /* FIX: either device has SPP A-MSDU Capab = 0 */)
+ pos[0] &= ~0x80;
+ pos++;
+ *pos++ = 0x00;
+ }
+
+ *aad_len = pos - aad;
+
+ os_memcpy(nonce + 1, hdr->addr2, ETH_ALEN);
+ nonce[7] = data[7]; /* PN5 */
+ nonce[8] = data[6]; /* PN4 */
+ nonce[9] = data[5]; /* PN3 */
+ nonce[10] = data[4]; /* PN2 */
+ nonce[11] = data[1]; /* PN1 */
+ nonce[12] = data[0]; /* PN0 */
+}
+
+
+static void ccmp_aad_nonce_pv1(const u8 *hdr, const u8 *a1, const u8 *a2,
+ const u8 *a3, const u8 *pn,
+ u8 *aad, size_t *aad_len, u8 *nonce)
+{
+ u16 fc, type;
+ u8 *pos;
+
+ nonce[0] = BIT(5); /* PV1 */
+ /* TODO: Priority for QMF; 0 is used for Data frames */
+
+ fc = WPA_GET_LE16(hdr);
+ type = (fc & (BIT(2) | BIT(3) | BIT(4))) >> 2;
+
+ if (type == 1)
+ nonce[0] |= 0x10; /* Management */
+
+ fc &= ~(BIT(10) | BIT(11) | BIT(13) | BIT(14) | BIT(15));
+ fc |= BIT(12);
+ WPA_PUT_LE16(aad, fc);
+ pos = aad + 2;
+ if (type == 0 || type == 3) {
+ const u8 *sc;
+
+ os_memcpy(pos, a1, ETH_ALEN);
+ pos += ETH_ALEN;
+ os_memcpy(pos, a2, ETH_ALEN);
+ pos += ETH_ALEN;
+
+ if (type == 0) {
+ /* Either A1 or A2 contains SID */
+ sc = hdr + 2 + 2 + ETH_ALEN;
+ } else {
+ /* Both A1 and A2 contain full addresses */
+ sc = hdr + 2 + 2 * ETH_ALEN;
+ }
+ /* SC with Sequence Number subfield (bits 4-15 of the Sequence
+ * Control field) masked to 0. */
+ *pos++ = *sc & 0x0f;
+ *pos++ = 0;
+
+ if (a3) {
+ os_memcpy(pos, a3, ETH_ALEN);
+ pos += ETH_ALEN;
+ }
+ }
+
+ *aad_len = pos - aad;
+
+ os_memcpy(nonce + 1, a2, ETH_ALEN);
+ nonce[7] = pn[5]; /* PN5 */
+ nonce[8] = pn[4]; /* PN4 */
+ nonce[9] = pn[3]; /* PN3 */
+ nonce[10] = pn[2]; /* PN2 */
+ nonce[11] = pn[1]; /* PN1 */
+ nonce[12] = pn[0]; /* PN0 */
+}
+
+
+u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
+ const u8 *data, size_t data_len, size_t *decrypted_len)
+{
+ u8 aad[30], nonce[13];
+ size_t aad_len;
+ size_t mlen;
+ u8 *plain;
+
+ if (data_len < 8 + 8)
+ return NULL;
+
+ plain = os_malloc(data_len + AES_BLOCK_SIZE);
+ if (plain == NULL)
+ return NULL;
+
+ mlen = data_len - 8 - 8;
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce(hdr, data, aad, &aad_len, nonce);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
+
+ if (aes_ccm_ad(tk, 16, nonce, 8, data + 8, mlen, aad, aad_len,
+ data + 8 + mlen, plain) < 0) {
+ u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
+ wpa_printf(MSG_INFO, "Invalid CCMP MIC in frame: A1=" MACSTR
+ " A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
+ MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
+ MAC2STR(hdr->addr3),
+ WLAN_GET_SEQ_SEQ(seq_ctrl),
+ WLAN_GET_SEQ_FRAG(seq_ctrl));
+ os_free(plain);
+ return NULL;
+ }
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
+
+ *decrypted_len = mlen;
+ return plain;
+}
+
+
+void ccmp_get_pn(u8 *pn, const u8 *data)
+{
+ pn[0] = data[7]; /* PN5 */
+ pn[1] = data[6]; /* PN4 */
+ pn[2] = data[5]; /* PN3 */
+ pn[3] = data[4]; /* PN2 */
+ pn[4] = data[1]; /* PN1 */
+ pn[5] = data[0]; /* PN0 */
+}
+
+
+u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
+ u8 *pn, int keyid, size_t *encrypted_len)
+{
+ u8 aad[30], nonce[13];
+ size_t aad_len, plen;
+ u8 *crypt, *pos;
+ struct ieee80211_hdr *hdr;
+
+ if (len < hdrlen || hdrlen < 24)
+ return NULL;
+ plen = len - hdrlen;
+
+ crypt = os_malloc(hdrlen + 8 + plen + 8 + AES_BLOCK_SIZE);
+ if (crypt == NULL)
+ return NULL;
+
+ os_memcpy(crypt, frame, hdrlen);
+ hdr = (struct ieee80211_hdr *) crypt;
+ hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
+ pos = crypt + hdrlen;
+ *pos++ = pn[5]; /* PN0 */
+ *pos++ = pn[4]; /* PN1 */
+ *pos++ = 0x00; /* Rsvd */
+ *pos++ = 0x20 | (keyid << 6);
+ *pos++ = pn[3]; /* PN2 */
+ *pos++ = pn[2]; /* PN3 */
+ *pos++ = pn[1]; /* PN4 */
+ *pos++ = pn[0]; /* PN5 */
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce(hdr, crypt + hdrlen, aad, &aad_len, nonce);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
+
+ if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
+ pos, pos + plen) < 0) {
+ os_free(crypt);
+ return NULL;
+ }
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen + 8, plen);
+
+ *encrypted_len = hdrlen + 8 + plen + 8;
+
+ return crypt;
+}
+
+
+u8 * ccmp_encrypt_pv1(const u8 *tk, const u8 *a1, const u8 *a2, const u8 *a3,
+ const u8 *frame, size_t len,
+ size_t hdrlen, const u8 *pn, int keyid,
+ size_t *encrypted_len)
+{
+ u8 aad[24], nonce[13];
+ size_t aad_len, plen;
+ u8 *crypt, *pos;
+ struct ieee80211_hdr *hdr;
+
+ if (len < hdrlen || hdrlen < 12)
+ return NULL;
+ plen = len - hdrlen;
+
+ crypt = os_malloc(hdrlen + plen + 8 + AES_BLOCK_SIZE);
+ if (crypt == NULL)
+ return NULL;
+
+ os_memcpy(crypt, frame, hdrlen);
+ hdr = (struct ieee80211_hdr *) crypt;
+ hdr->frame_control |= host_to_le16(BIT(12)); /* Protected Frame */
+ pos = crypt + hdrlen;
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce_pv1(crypt, a1, a2, a3, pn, aad, &aad_len, nonce);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, sizeof(nonce));
+
+ if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
+ pos, pos + plen) < 0) {
+ os_free(crypt);
+ return NULL;
+ }
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen, plen);
+
+ *encrypted_len = hdrlen + plen + 8;
+
+ return crypt;
+}
+
+
+u8 * ccmp_256_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
+ const u8 *data, size_t data_len, size_t *decrypted_len)
+{
+ u8 aad[30], nonce[13];
+ size_t aad_len;
+ size_t mlen;
+ u8 *plain;
+
+ if (data_len < 8 + 16)
+ return NULL;
+
+ plain = os_malloc(data_len + AES_BLOCK_SIZE);
+ if (plain == NULL)
+ return NULL;
+
+ mlen = data_len - 8 - 16;
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce(hdr, data, aad, &aad_len, nonce);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 AAD", aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 nonce", nonce, 13);
+
+ if (aes_ccm_ad(tk, 32, nonce, 16, data + 8, mlen, aad, aad_len,
+ data + 8 + mlen, plain) < 0) {
+ u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
+ wpa_printf(MSG_INFO, "Invalid CCMP-256 MIC in frame: A1=" MACSTR
+ " A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
+ MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
+ MAC2STR(hdr->addr3),
+ WLAN_GET_SEQ_SEQ(seq_ctrl),
+ WLAN_GET_SEQ_FRAG(seq_ctrl));
+ os_free(plain);
+ return NULL;
+ }
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 decrypted", plain, mlen);
+
+ *decrypted_len = mlen;
+ return plain;
+}
+
+
+u8 * ccmp_256_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen,
+ u8 *qos, u8 *pn, int keyid, size_t *encrypted_len)
+{
+ u8 aad[30], nonce[13];
+ size_t aad_len, plen;
+ u8 *crypt, *pos;
+ struct ieee80211_hdr *hdr;
+
+ if (len < hdrlen || hdrlen < 24)
+ return NULL;
+ plen = len - hdrlen;
+
+ crypt = os_malloc(hdrlen + 8 + plen + 16 + AES_BLOCK_SIZE);
+ if (crypt == NULL)
+ return NULL;
+
+ os_memcpy(crypt, frame, hdrlen);
+ hdr = (struct ieee80211_hdr *) crypt;
+ hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
+ pos = crypt + hdrlen;
+ *pos++ = pn[5]; /* PN0 */
+ *pos++ = pn[4]; /* PN1 */
+ *pos++ = 0x00; /* Rsvd */
+ *pos++ = 0x20 | (keyid << 6);
+ *pos++ = pn[3]; /* PN2 */
+ *pos++ = pn[2]; /* PN3 */
+ *pos++ = pn[1]; /* PN4 */
+ *pos++ = pn[0]; /* PN5 */
+
+ os_memset(aad, 0, sizeof(aad));
+ ccmp_aad_nonce(hdr, crypt + hdrlen, aad, &aad_len, nonce);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 AAD", aad, aad_len);
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 nonce", nonce, 13);
+
+ if (aes_ccm_ae(tk, 32, nonce, 16, frame + hdrlen, plen, aad, aad_len,
+ pos, pos + plen) < 0) {
+ os_free(crypt);
+ return NULL;
+ }
+
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP-256 encrypted", crypt + hdrlen + 8,
+ plen);
+
+ *encrypted_len = hdrlen + 8 + plen + 16;
+
+ return crypt;
+}
projects / mech_eap.git / blobdiff