wlantest: Add GCMP implementation and test vectors from P802.11ad/D9.0
Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
parent
5a652e71b0
commit
455bcc0f5c
4 changed files with 517 additions and 0 deletions
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@ -77,6 +77,7 @@ TOBJS += ccmp.o
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TOBJS += tkip.o
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TOBJS += wep.o
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TOBJS += bip.o
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TOBJS += gcmp.o
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../src/utils/libutils.a:
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448
wlantest/gcmp.c
Normal file
448
wlantest/gcmp.c
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@ -0,0 +1,448 @@
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/*
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* GCM with GMAC Protocol (GCMP)
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* Copyright (c) 2012, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "common/ieee802_11_defs.h"
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#include "crypto/aes.h"
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#include "wlantest.h"
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static void inc32(u8 *block)
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{
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u32 val;
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val = WPA_GET_BE32(block + AES_BLOCK_SIZE - 4);
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val++;
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WPA_PUT_BE32(block + AES_BLOCK_SIZE - 4, val);
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}
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static void xor_block(u8 *dst, const u8 *src)
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{
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u32 *d = (u32 *) dst;
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u32 *s = (u32 *) src;
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*d++ ^= *s++;
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*d++ ^= *s++;
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*d++ ^= *s++;
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*d++ ^= *s++;
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}
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static void shift_right_block(u8 *v)
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{
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u32 val;
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val = WPA_GET_BE32(v + 12);
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val >>= 1;
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if (v[11] & 0x01)
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val |= 0x80000000;
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WPA_PUT_BE32(v + 12, val);
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val = WPA_GET_BE32(v + 8);
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val >>= 1;
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if (v[7] & 0x01)
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val |= 0x80000000;
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WPA_PUT_BE32(v + 8, val);
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val = WPA_GET_BE32(v + 4);
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val >>= 1;
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if (v[3] & 0x01)
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val |= 0x80000000;
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WPA_PUT_BE32(v + 4, val);
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val = WPA_GET_BE32(v);
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val >>= 1;
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WPA_PUT_BE32(v, val);
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}
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/* Multiplication in GF(2^128) */
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static void gf_mult(const u8 *x, const u8 *y, u8 *z)
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{
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u8 v[16];
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int i, j;
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os_memset(z, 0, 16); /* Z_0 = 0^128 */
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os_memcpy(v, y, 16); /* V_0 = Y */
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for (i = 0; i < 16; i++) {
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for (j = 0; j < 8; j++) {
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if (x[i] & BIT(7 - j)) {
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/* Z_(i + 1) = Z_i XOR V_i */
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xor_block(z, v);
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} else {
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/* Z_(i + 1) = Z_i */
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}
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if (v[15] & 0x01) {
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/* V_(i + 1) = (V_i >> 1) XOR R */
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shift_right_block(v);
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/* R = 11100001 || 0^120 */
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v[0] ^= 0xe1;
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} else {
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/* V_(i + 1) = V_i >> 1 */
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shift_right_block(v);
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}
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}
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}
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}
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static void ghash(const u8 *h, const u8 *x, size_t xlen, u8 *y)
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{
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size_t m, i;
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const u8 *xpos = x;
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u8 tmp[16];
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m = xlen / 16;
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/* Y_0 = 0^128 */
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os_memset(y, 0, 16);
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for (i = 0; i < m; i++) {
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/* Y_i = (Y^(i-1) XOR X_i) dot H */
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xor_block(y, xpos);
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xpos += 16;
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/* dot operation:
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* multiplication operation for binary Galois (finite) field of
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* 2^128 elements */
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gf_mult(y, h, tmp);
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os_memcpy(y, tmp, 16);
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}
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/* Return Y_m */
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}
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static void aes_gctr(void *aes, const u8 *icb, const u8 *x, size_t xlen, u8 *y)
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{
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size_t i, n, last;
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u8 cb[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE];
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const u8 *xpos = x;
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u8 *ypos = y;
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if (xlen == 0)
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return;
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n = xlen / 16;
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os_memcpy(cb, icb, AES_BLOCK_SIZE);
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/* Full blocks */
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for (i = 0; i < n; i++) {
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aes_encrypt(aes, cb, ypos);
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xor_block(ypos, xpos);
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xpos += AES_BLOCK_SIZE;
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ypos += AES_BLOCK_SIZE;
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inc32(cb);
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}
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last = x + xlen - xpos;
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if (last) {
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/* Last, partial block */
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aes_encrypt(aes, cb, tmp);
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for (i = 0; i < last; i++)
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*ypos++ = *xpos++ ^ tmp[i];
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}
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}
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static void gcmp_aad_nonce(const struct ieee80211_hdr *hdr, const u8 *data,
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u8 *aad, size_t *aad_len, u8 *nonce)
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{
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u16 fc, stype, seq;
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int qos = 0, addr4 = 0;
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u8 *pos;
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fc = le_to_host16(hdr->frame_control);
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stype = WLAN_FC_GET_STYPE(fc);
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if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
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(WLAN_FC_TODS | WLAN_FC_FROMDS))
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addr4 = 1;
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if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) {
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fc &= ~0x0070; /* Mask subtype bits */
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if (stype & 0x08) {
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const u8 *qc;
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qos = 1;
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fc &= ~WLAN_FC_ORDER;
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qc = (const u8 *) (hdr + 1);
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if (addr4)
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qc += ETH_ALEN;
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}
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}
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fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA);
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fc |= WLAN_FC_ISWEP;
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WPA_PUT_LE16(aad, fc);
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pos = aad + 2;
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os_memcpy(pos, hdr->addr1, 3 * ETH_ALEN);
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pos += 3 * ETH_ALEN;
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seq = le_to_host16(hdr->seq_ctrl);
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seq &= ~0xfff0; /* Mask Seq#; do not modify Frag# */
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WPA_PUT_LE16(pos, seq);
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pos += 2;
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os_memcpy(pos, hdr + 1, addr4 * ETH_ALEN + qos * 2);
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pos += addr4 * ETH_ALEN;
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if (qos) {
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pos[0] &= ~0x70;
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if (1 /* FIX: either device has SPP A-MSDU Capab = 0 */)
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pos[0] &= ~0x80;
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pos++;
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*pos++ = 0x00;
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}
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*aad_len = pos - aad;
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os_memcpy(nonce, hdr->addr2, ETH_ALEN);
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nonce[6] = data[7]; /* PN5 */
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nonce[7] = data[6]; /* PN4 */
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nonce[8] = data[5]; /* PN3 */
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nonce[9] = data[4]; /* PN2 */
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nonce[10] = data[1]; /* PN1 */
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nonce[11] = data[0]; /* PN0 */
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}
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u8 * gcmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
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const u8 *data, size_t data_len, size_t *decrypted_len)
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{
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u8 aad[2 + 30], nonce[12], *plain, *auth, *apos;
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u8 H[AES_BLOCK_SIZE];
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u8 J0[AES_BLOCK_SIZE];
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u8 S[16], T[16];
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size_t aad_len, padlen, mlen;
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void *aes;
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const u8 *m;
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if (data_len < 8 + 16)
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return NULL;
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plain = os_malloc(data_len + AES_BLOCK_SIZE);
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if (plain == NULL)
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return NULL;
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aes = aes_encrypt_init(tk, 16);
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if (aes == NULL) {
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os_free(plain);
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return NULL;
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}
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m = data + 8;
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mlen = data_len - 8 - 16;
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os_memset(aad, 0, sizeof(aad));
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gcmp_aad_nonce(hdr, data, &aad[2], &aad_len, nonce);
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WPA_PUT_BE16(aad, aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP AAD", &aad[2], aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP nonce", nonce, sizeof(nonce));
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/* GCM-AD_K(IV, C, A, T)
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*
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* IV = GCMP nonce
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* A = AAD
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* C | T = received frame
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*/
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/* 2. Generate hash subkey H = AES_K(0^128) */
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os_memset(H, 0, sizeof(H));
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aes_encrypt(aes, H, H);
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wpa_hexdump(MSG_EXCESSIVE, "Hash subkey H for GHASH", H, sizeof(H));
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/* 3. Prepare block J_0 = IV || 0^31 || 1 [len(IV) = 96] */
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os_memcpy(J0, nonce, sizeof(nonce));
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os_memset(J0 + sizeof(nonce), 0, AES_BLOCK_SIZE - sizeof(nonce));
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J0[AES_BLOCK_SIZE - 1] = 0x01;
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/* 4. C = GCTR_K(inc_32(J_0), C) */
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inc32(J0);
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aes_gctr(aes, J0, m, mlen, plain);
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/*
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* 5. u = 128 * ceil[len(C)/128] - len(C)
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* v = 128 * ceil[len(A)/128] - len(A)
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* 6. S = GHASH_H(A || 0^v || C || 0^u || [len(A)]64 || [len(C)]64)
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* (i.e., zero padded to block size A || C and lengths of each in bits)
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*/
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auth = os_malloc(32 + 16 + data_len - 16 + 8 + 8);
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if (auth == NULL) {
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os_free(plain);
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return NULL;
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}
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apos = auth;
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/* Zero-padded AAD */
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os_memcpy(apos, &aad[2], aad_len);
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apos += aad_len;
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padlen = (16 - aad_len % 16) % 16;
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os_memset(apos, 0, padlen);
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apos += padlen;
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/* Zero-padded C */
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os_memcpy(apos, m, mlen);
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apos += mlen;
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padlen = (16 - mlen % 16) % 16;
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os_memset(apos, 0, padlen);
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apos += padlen;
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/* Length of AAD and C in bits */
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WPA_PUT_BE64(apos, aad_len * 8);
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apos += 8;
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WPA_PUT_BE64(apos, mlen * 8);
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apos += 8;
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wpa_hexdump(MSG_EXCESSIVE, "GCMP GHASH_H input", auth, apos - auth);
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ghash(H, auth, apos - auth, S);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP S = GHASH_H(...)", S, 16);
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os_free(auth);
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/* 7. T' = MSB_t(GCTR_K(J_0, S)) */
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J0[AES_BLOCK_SIZE - 1] = 0x01;
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aes_gctr(aes, J0, S, sizeof(S), T);
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aes_encrypt_deinit(aes);
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if (os_memcmp(data + data_len - 16, T, 16) != 0) {
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u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
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wpa_printf(MSG_INFO, "Invalid GCMP MIC in frame: A1=" MACSTR
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" A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3),
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WLAN_GET_SEQ_SEQ(seq_ctrl),
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WLAN_GET_SEQ_FRAG(seq_ctrl));
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wpa_hexdump(MSG_DEBUG, "GCMP decrypted", plain, data_len - 16);
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os_free(plain);
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return NULL;
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}
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*decrypted_len = data_len - 8 - 16;
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return plain;
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}
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u8 * gcmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
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u8 *pn, int keyid, size_t *encrypted_len)
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{
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u8 aad[2 + 30], nonce[12], *crypt, *pos, *auth, *apos;
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u8 H[AES_BLOCK_SIZE];
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u8 J0[AES_BLOCK_SIZE];
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u8 S[16];
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size_t aad_len, plen, padlen;
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struct ieee80211_hdr *hdr;
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void *aes;
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if (len < hdrlen || hdrlen < 24)
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return NULL;
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plen = len - hdrlen;
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crypt = os_malloc(hdrlen + 8 + plen + 16 + AES_BLOCK_SIZE);
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if (crypt == NULL)
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return NULL;
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os_memcpy(crypt, frame, hdrlen);
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hdr = (struct ieee80211_hdr *) crypt;
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hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
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pos = crypt + hdrlen;
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*pos++ = pn[5]; /* PN0 */
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*pos++ = pn[4]; /* PN1 */
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*pos++ = 0x00; /* Rsvd */
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*pos++ = 0x20 | (keyid << 6);
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*pos++ = pn[3]; /* PN2 */
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*pos++ = pn[2]; /* PN3 */
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*pos++ = pn[1]; /* PN4 */
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*pos++ = pn[0]; /* PN5 */
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aes = aes_encrypt_init(tk, 16);
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if (aes == NULL) {
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os_free(crypt);
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return NULL;
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}
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os_memset(aad, 0, sizeof(aad));
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gcmp_aad_nonce(hdr, crypt + hdrlen, &aad[2], &aad_len, nonce);
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WPA_PUT_BE16(aad, aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP AAD", &aad[2], aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP nonce", nonce, sizeof(nonce));
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/* GCM-AE_K(IV, P, A)
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*
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* IV = GCMP nonce
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* A = AAD
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*/
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/* 1. Generate hash subkey H = AES_K(0^128) */
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os_memset(H, 0, sizeof(H));
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aes_encrypt(aes, H, H);
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wpa_hexdump(MSG_EXCESSIVE, "Hash subkey H for GHASH", H, sizeof(H));
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/* 2. Prepare block J_0 = IV || 0^31 || 1 [len(IV) = 96] */
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os_memcpy(J0, nonce, sizeof(nonce));
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os_memset(J0 + sizeof(nonce), 0, AES_BLOCK_SIZE - sizeof(nonce));
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J0[AES_BLOCK_SIZE - 1] = 0x01;
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/* 3. C = GCTR_K(inc_32(J_0), P) */
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inc32(J0);
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aes_gctr(aes, J0, frame + hdrlen, len - hdrlen, pos);
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pos += len - hdrlen;
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/*
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* 4. u = 128 * ceil[len(C)/128] - len(C)
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* v = 128 * ceil[len(A)/128] - len(A)
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* 5. S = GHASH_H(A || 0^v || C || 0^u || [len(A)]64 || [len(C)]64)
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* (i.e., zero padded to block size A || C and lengths of each in bits)
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*/
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auth = os_malloc(32 + 16 + len - hdrlen + 8 + 8);
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if (auth == NULL) {
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os_free(crypt);
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return NULL;
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}
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apos = auth;
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/* Zero-padded AAD */
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os_memcpy(apos, &aad[2], aad_len);
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apos += aad_len;
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padlen = (16 - aad_len % 16) % 16;
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os_memset(apos, 0, padlen);
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apos += padlen;
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/* Zero-padded C */
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os_memcpy(apos, crypt + hdrlen + 8, plen);
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apos += plen;
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padlen = (16 - plen % 16) % 16;
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os_memset(apos, 0, padlen);
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apos += padlen;
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/* Length of AAD and C in bits */
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WPA_PUT_BE64(apos, aad_len * 8);
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apos += 8;
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WPA_PUT_BE64(apos, plen * 8);
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apos += 8;
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wpa_hexdump(MSG_EXCESSIVE, "GCMP GHASH_H input", auth, apos - auth);
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ghash(H, auth, apos - auth, S);
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wpa_hexdump(MSG_EXCESSIVE, "GCMP S = GHASH_H(...)", S, 16);
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os_free(auth);
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/* 6. T = MSB_t(GCTR_K(J_0, S)) */
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J0[AES_BLOCK_SIZE - 1] = 0x01;
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aes_gctr(aes, J0, S, sizeof(S), pos);
|
||||
wpa_hexdump(MSG_EXCESSIVE, "GCMP MIC", pos, 16);
|
||||
|
||||
/* 7. Return (C, T) */
|
||||
|
||||
wpa_hexdump(MSG_EXCESSIVE, "GCMP encrypted", crypt + hdrlen + 8, plen);
|
||||
|
||||
aes_encrypt_deinit(aes);
|
||||
|
||||
*encrypted_len = hdrlen + 8 + plen + 16;
|
||||
|
||||
return crypt;
|
||||
}
|
||||
|
|
@ -225,6 +225,68 @@ static void test_vector_ccmp_mgmt(void)
|
|||
}
|
||||
|
||||
|
||||
static void test_vector_gcmp(void)
|
||||
{
|
||||
u8 tk[] = { 0xc9, 0x7c, 0x1f, 0x67, 0xce, 0x37, 0x11, 0x85,
|
||||
0x51, 0x4a, 0x8a, 0x19, 0xf2, 0xbd, 0xd5, 0x2f };
|
||||
u8 pn[] = {
|
||||
0x00, 0x89, 0x5F, 0x5F, 0x2B, 0x08
|
||||
};
|
||||
u8 frame[] = {
|
||||
0x88, 0x48, 0x0b, 0x00, 0x0f, 0xd2, 0xe1, 0x28,
|
||||
0xa5, 0x7c, 0x50, 0x30, 0xf1, 0x84, 0x44, 0x08,
|
||||
0x50, 0x30, 0xf1, 0x84, 0x44, 0x08, 0x80, 0x33,
|
||||
0x03, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
|
||||
0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
|
||||
0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
|
||||
0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
|
||||
0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
|
||||
0x26, 0x27
|
||||
};
|
||||
u8 *enc, *plain;
|
||||
size_t enc_len, plain_len;
|
||||
u8 fcs[4];
|
||||
|
||||
wpa_printf(MSG_INFO, "\nIEEE P802.11ad/D9.0, M.11.1 GCMP test "
|
||||
"vector #2\n");
|
||||
|
||||
wpa_hexdump(MSG_INFO, "TK", tk, sizeof(tk));
|
||||
wpa_hexdump(MSG_INFO, "PN", pn, sizeof(pn));
|
||||
wpa_hexdump(MSG_INFO, "802.11 Header", frame, 26);
|
||||
wpa_hexdump(MSG_INFO, "Plaintext Data", frame + 26, sizeof(frame) - 26);
|
||||
|
||||
enc = gcmp_encrypt(tk, frame, sizeof(frame), 26, frame + 24, pn, 0,
|
||||
&enc_len);
|
||||
if (enc == NULL) {
|
||||
wpa_printf(MSG_ERROR, "Failed to encrypt GCMP frame");
|
||||
return;
|
||||
}
|
||||
|
||||
wpa_hexdump(MSG_INFO, "Encrypted MPDU (without FCS)", enc, enc_len);
|
||||
WPA_PUT_LE32(fcs, crc32(enc, enc_len));
|
||||
wpa_hexdump(MSG_INFO, "FCS", fcs, sizeof(fcs));
|
||||
|
||||
wpa_debug_level = MSG_INFO;
|
||||
plain = gcmp_decrypt(tk, (const struct ieee80211_hdr *) enc,
|
||||
enc + 26, enc_len - 26, &plain_len);
|
||||
wpa_debug_level = MSG_EXCESSIVE;
|
||||
os_free(enc);
|
||||
|
||||
if (plain == NULL) {
|
||||
wpa_printf(MSG_ERROR, "Failed to decrypt GCMP frame");
|
||||
return;
|
||||
}
|
||||
|
||||
if (plain_len != sizeof(frame) - 26 ||
|
||||
os_memcmp(plain, frame + 26, plain_len) != 0) {
|
||||
wpa_hexdump(MSG_ERROR, "Decryption result did not match",
|
||||
plain, plain_len);
|
||||
}
|
||||
|
||||
os_free(plain);
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
wpa_debug_level = MSG_EXCESSIVE;
|
||||
|
|
@ -237,6 +299,7 @@ int main(int argc, char *argv[])
|
|||
test_vector_ccmp();
|
||||
test_vector_bip();
|
||||
test_vector_ccmp_mgmt();
|
||||
test_vector_gcmp();
|
||||
|
||||
os_program_deinit();
|
||||
|
||||
|
|
|
|||
|
|
@ -240,6 +240,11 @@ u8 * wep_decrypt(struct wlantest *wt, const struct ieee80211_hdr *hdr,
|
|||
u8 * bip_protect(const u8 *igtk, u8 *frame, size_t len, u8 *ipn, int keyid,
|
||||
size_t *prot_len);
|
||||
|
||||
u8 * gcmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
|
||||
const u8 *data, size_t data_len, size_t *decrypted_len);
|
||||
u8 * gcmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
|
||||
u8 *pn, int keyid, size_t *encrypted_len);
|
||||
|
||||
int ctrl_init(struct wlantest *wt);
|
||||
void ctrl_deinit(struct wlantest *wt);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue