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authorJouni Malinen <j@w1.fi>2012-08-09 20:10:01 (GMT)
committerJouni Malinen <j@w1.fi>2012-08-09 20:18:32 (GMT)
commitdcf10b4502bd7f07d0d5132b62112f3850c24fbb (patch)
treea96612fb3badad072aba2487ac1d5fcc90f5ec4e /wlantest/ccmp.c
parent3aed10f3b7f643f288f6aa1c5aef223c5c679b9e (diff)
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AOSP: These files have been removed from AOSPaosp-jb
Diffstat (limited to 'wlantest/ccmp.c')
-rw-r--r--wlantest/ccmp.c349
1 files changed, 0 insertions, 349 deletions
diff --git a/wlantest/ccmp.c b/wlantest/ccmp.c
deleted file mode 100644
index 6292ee0..0000000
--- a/wlantest/ccmp.c
+++ /dev/null
@@ -1,349 +0,0 @@
-/*
- * CTR with CBC-MAC Protocol (CCMP)
- * Copyright (c) 2010, 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 "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 xor_aes_block(u8 *dst, const u8 *src)
-{
- u32 *d = (u32 *) dst;
- u32 *s = (u32 *) src;
- *d++ ^= *s++;
- *d++ ^= *s++;
- *d++ ^= *s++;
- *d++ ^= *s++;
-}
-
-
-u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
- const u8 *data, size_t data_len, size_t *decrypted_len)
-{
- u8 aad[2 + 30], nonce[13];
- size_t aad_len;
- u8 b[AES_BLOCK_SIZE], x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
- void *aes;
- const u8 *m, *mpos, *mic;
- size_t mlen, last;
- int i;
- u8 *plain, *ppos;
- u8 t[8];
-
- if (data_len < 8 + 8)
- return NULL;
-
- plain = os_malloc(data_len + AES_BLOCK_SIZE);
- if (plain == NULL)
- return NULL;
-
- aes = aes_encrypt_init(tk, 16);
- if (aes == NULL) {
- os_free(plain);
- return NULL;
- }
-
- m = data + 8;
- mlen = data_len - 8 - 8;
- last = mlen % AES_BLOCK_SIZE;
-
- os_memset(aad, 0, sizeof(aad));
- ccmp_aad_nonce(hdr, data, &aad[2], &aad_len, nonce);
- WPA_PUT_BE16(aad, aad_len);
- wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", &aad[2], aad_len);
- wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
-
- /* CCM: M=8 L=2, Adata=1, M' = (M-2)/2 = 3, L' = L-1 = 1 */
-
- /* A_i = Flags | Nonce N | Counter i */
- a[0] = 0x01; /* Flags = L' */
- os_memcpy(&a[1], nonce, 13);
-
- /* Decryption */
-
- mic = data + data_len - 8;
- wpa_hexdump(MSG_EXCESSIVE, "CCMP U", mic, 8);
- /* U = T XOR S_0; S_0 = E(K, A_0) */
- WPA_PUT_BE16(&a[14], 0);
- aes_encrypt(aes, a, x);
- for (i = 0; i < 8; i++)
- t[i] = mic[i] ^ x[i];
- wpa_hexdump(MSG_EXCESSIVE, "CCMP T", t, 8);
-
- /* plaintext = msg XOR (S_1 | S_2 | ... | S_n) */
- ppos = plain;
- mpos = m;
- for (i = 1; i <= mlen / AES_BLOCK_SIZE; i++) {
- WPA_PUT_BE16(&a[14], i);
- /* S_i = E(K, A_i) */
- aes_encrypt(aes, a, ppos);
- xor_aes_block(ppos, mpos);
- ppos += AES_BLOCK_SIZE;
- mpos += AES_BLOCK_SIZE;
- }
- if (last) {
- WPA_PUT_BE16(&a[14], i);
- aes_encrypt(aes, a, ppos);
- /* XOR zero-padded last block */
- for (i = 0; i < last; i++)
- *ppos++ ^= *mpos++;
- }
- wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
-
- /* Authentication */
- /* B_0: Flags | Nonce N | l(m) */
- b[0] = 0x40 /* Adata */ | (3 /* M' */ << 3) | 1 /* L' */;
- os_memcpy(&b[1], nonce, 13);
- WPA_PUT_BE16(&b[14], mlen);
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_0", b, AES_BLOCK_SIZE);
- aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_1", aad, AES_BLOCK_SIZE);
- xor_aes_block(aad, x);
- aes_encrypt(aes, aad, x); /* X_2 = E(K, X_1 XOR B_1) */
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_2", &aad[AES_BLOCK_SIZE],
- AES_BLOCK_SIZE);
- xor_aes_block(&aad[AES_BLOCK_SIZE], x);
- aes_encrypt(aes, &aad[AES_BLOCK_SIZE], x); /* X_3 = E(K, X_2 XOR B_2)
- */
-
- ppos = plain;
- for (i = 0; i < mlen / AES_BLOCK_SIZE; i++) {
- /* X_i+1 = E(K, X_i XOR B_i) */
- xor_aes_block(x, ppos);
- ppos += AES_BLOCK_SIZE;
- aes_encrypt(aes, x, x);
- }
- if (last) {
- /* XOR zero-padded last block */
- for (i = 0; i < last; i++)
- x[i] ^= *ppos++;
- aes_encrypt(aes, x, x);
- }
-
- aes_encrypt_deinit(aes);
-
- if (os_memcmp(x, t, 8) != 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));
- wpa_hexdump(MSG_DEBUG, "CCMP decrypted", plain, mlen);
- os_free(plain);
- return NULL;
- }
-
- *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[2 + 30], nonce[13];
- size_t aad_len;
- u8 b[AES_BLOCK_SIZE], x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
- void *aes;
- u8 *crypt, *pos, *ppos, *mpos;
- size_t plen, last;
- struct ieee80211_hdr *hdr;
- int i;
-
- if (len < hdrlen || hdrlen < 24)
- return NULL;
- plen = len - hdrlen;
- last = plen % AES_BLOCK_SIZE;
-
- 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 */
-
- aes = aes_encrypt_init(tk, 16);
- if (aes == NULL) {
- os_free(crypt);
- return NULL;
- }
-
- os_memset(aad, 0, sizeof(aad));
- ccmp_aad_nonce(hdr, crypt + hdrlen, &aad[2], &aad_len, nonce);
- WPA_PUT_BE16(aad, aad_len);
- wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", &aad[2], aad_len);
- wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
-
- /* Authentication */
- /* B_0: Flags | Nonce N | l(m) */
- b[0] = 0x40 /* Adata */ | (3 /* M' */ << 3) | 1 /* L' */;
- os_memcpy(&b[1], nonce, 13);
- WPA_PUT_BE16(&b[14], plen);
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_0", b, AES_BLOCK_SIZE);
- aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_1", aad, AES_BLOCK_SIZE);
- xor_aes_block(aad, x);
- aes_encrypt(aes, aad, x); /* X_2 = E(K, X_1 XOR B_1) */
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP B_2", &aad[AES_BLOCK_SIZE],
- AES_BLOCK_SIZE);
- xor_aes_block(&aad[AES_BLOCK_SIZE], x);
- aes_encrypt(aes, &aad[AES_BLOCK_SIZE], x); /* X_3 = E(K, X_2 XOR B_2)
- */
-
- ppos = frame + hdrlen;
- for (i = 0; i < plen / AES_BLOCK_SIZE; i++) {
- /* X_i+1 = E(K, X_i XOR B_i) */
- xor_aes_block(x, ppos);
- ppos += AES_BLOCK_SIZE;
- aes_encrypt(aes, x, x);
- }
- if (last) {
- /* XOR zero-padded last block */
- for (i = 0; i < last; i++)
- x[i] ^= *ppos++;
- aes_encrypt(aes, x, x);
- }
-
- /* Encryption */
-
- /* CCM: M=8 L=2, Adata=1, M' = (M-2)/2 = 3, L' = L-1 = 1 */
-
- /* A_i = Flags | Nonce N | Counter i */
- a[0] = 0x01; /* Flags = L' */
- os_memcpy(&a[1], nonce, 13);
-
- ppos = crypt + hdrlen + 8;
-
- /* crypt = msg XOR (S_1 | S_2 | ... | S_n) */
- mpos = frame + hdrlen;
- for (i = 1; i <= plen / AES_BLOCK_SIZE; i++) {
- WPA_PUT_BE16(&a[14], i);
- /* S_i = E(K, A_i) */
- aes_encrypt(aes, a, ppos);
- xor_aes_block(ppos, mpos);
- ppos += AES_BLOCK_SIZE;
- mpos += AES_BLOCK_SIZE;
- }
- if (last) {
- WPA_PUT_BE16(&a[14], i);
- aes_encrypt(aes, a, ppos);
- /* XOR zero-padded last block */
- for (i = 0; i < last; i++)
- *ppos++ ^= *mpos++;
- }
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP T", x, 8);
- /* U = T XOR S_0; S_0 = E(K, A_0) */
- WPA_PUT_BE16(&a[14], 0);
- aes_encrypt(aes, a, b);
- for (i = 0; i < 8; i++)
- ppos[i] = x[i] ^ b[i];
- wpa_hexdump(MSG_EXCESSIVE, "CCMP U", ppos, 8);
-
- wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen + 8, plen);
-
- aes_encrypt_deinit(aes);
-
- *encrypted_len = hdrlen + 8 + plen + 8;
-
- return crypt;
-}