/*
* CTR with CBC-MAC Protocol (CCMP)
- * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
+ * 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/common.h"
#include "common/ieee802_11_defs.h"
#include "crypto/aes.h"
+#include "crypto/aes_wrap.h"
#include "wlantest.h"
}
-static void xor_aes_block(u8 *dst, const u8 *src)
+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)
{
- u32 *d = (u32 *) dst;
- u32 *s = (u32 *) src;
- *d++ ^= *s++;
- *d++ ^= *s++;
- *d++ ^= *s++;
- *d++ ^= *s++;
+ 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[2 + 30], nonce[13];
+ u8 aad[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];
+ size_t mlen;
+ u8 *plain;
if (data_len < 8 + 8)
return NULL;
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);
+ 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);
- /* 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) {
+ 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->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;
}
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
*decrypted_len = mlen;
return plain;
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;
+ u8 aad[30], nonce[13];
+ size_t aad_len, plen;
+ u8 *crypt, *pos;
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)
*pos++ = pn[1]; /* PN4 */
*pos++ = pn[0]; /* PN5 */
- aes = aes_encrypt_init(tk, 16);
- if (aes == NULL) {
+ 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(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);
+ 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));
- /* 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);
+ if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
+ pos, pos + plen) < 0) {
+ os_free(crypt);
+ return NULL;
}
- /* Encryption */
+ wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen, plen);
- /* CCM: M=8 L=2, Adata=1, M' = (M-2)/2 = 3, L' = L-1 = 1 */
+ *encrypted_len = hdrlen + plen + 8;
- /* A_i = Flags | Nonce N | Counter i */
- a[0] = 0x01; /* Flags = L' */
- os_memcpy(&a[1], nonce, 13);
+ return crypt;
+}
- 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++;
+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);
- 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);
+ *decrypted_len = mlen;
+ return plain;
+}
- wpa_hexdump(MSG_EXCESSIVE, "CCMP encrypted", crypt + hdrlen + 8, plen);
- aes_encrypt_deinit(aes);
+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;
- *encrypted_len = hdrlen + 8 + plen + 8;
+ 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