wlantest: Move generic AES-CCM into separate functions
This part of the implementation is not specific to CCMP and could be used for other purposes, too. Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
parent
071c6164ab
commit
05d6054cec
409
wlantest/ccmp.c
409
wlantest/ccmp.c
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@ -1,6 +1,6 @@
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/*
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* CTR with CBC-MAC Protocol (CCMP)
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* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
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* Copyright (c) 2010-2012, 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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@ -14,6 +14,204 @@
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#include "wlantest.h"
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static void xor_aes_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 aes_ccm_auth_start(void *aes, size_t M, size_t L, const u8 *nonce,
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const u8 *aad, size_t aad_len, size_t plain_len,
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u8 *x)
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{
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u8 aad_buf[2 * AES_BLOCK_SIZE];
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u8 b[AES_BLOCK_SIZE];
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/* Authentication */
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/* B_0: Flags | Nonce N | l(m) */
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b[0] = aad_len ? 0x40 : 0 /* Adata */;
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b[0] |= (((M - 2) / 2) /* M' */ << 3);
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b[0] |= (L - 1) /* L' */;
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os_memcpy(&b[1], nonce, 15 - L);
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WPA_PUT_BE16(&b[AES_BLOCK_SIZE - L], plain_len);
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wpa_hexdump_key(MSG_EXCESSIVE, "CCM B_0", b, AES_BLOCK_SIZE);
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aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */
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if (!aad_len)
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return;
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WPA_PUT_BE16(aad_buf, aad_len);
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os_memcpy(aad_buf + 2, aad, aad_len);
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os_memset(aad_buf + 2 + aad_len, 0, sizeof(aad_buf) - 2 - aad_len);
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xor_aes_block(aad_buf, x);
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aes_encrypt(aes, aad_buf, x); /* X_2 = E(K, X_1 XOR B_1) */
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if (aad_len > AES_BLOCK_SIZE - 2) {
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xor_aes_block(&aad_buf[AES_BLOCK_SIZE], x);
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/* X_3 = E(K, X_2 XOR B_2) */
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aes_encrypt(aes, &aad_buf[AES_BLOCK_SIZE], x);
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}
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}
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static void aes_ccm_auth(void *aes, const u8 *data, size_t len, u8 *x)
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{
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size_t last = len % AES_BLOCK_SIZE;
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size_t i;
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for (i = 0; i < len / AES_BLOCK_SIZE; i++) {
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/* X_i+1 = E(K, X_i XOR B_i) */
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xor_aes_block(x, data);
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data += AES_BLOCK_SIZE;
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aes_encrypt(aes, x, x);
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}
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if (last) {
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/* XOR zero-padded last block */
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for (i = 0; i < last; i++)
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x[i] ^= *data++;
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aes_encrypt(aes, x, x);
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}
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}
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static void aes_ccm_encr_start(size_t L, const u8 *nonce, u8 *a)
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{
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/* A_i = Flags | Nonce N | Counter i */
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a[0] = L - 1; /* Flags = L' */
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os_memcpy(&a[1], nonce, 15 - L);
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}
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static void aes_ccm_encr(void *aes, size_t L, const u8 *in, size_t len, u8 *out,
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u8 *a)
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{
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size_t last = len % AES_BLOCK_SIZE;
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size_t i;
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/* crypt = msg XOR (S_1 | S_2 | ... | S_n) */
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for (i = 1; i <= len / AES_BLOCK_SIZE; i++) {
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WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], i);
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/* S_i = E(K, A_i) */
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aes_encrypt(aes, a, out);
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xor_aes_block(out, in);
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out += AES_BLOCK_SIZE;
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in += AES_BLOCK_SIZE;
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}
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if (last) {
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WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], i);
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aes_encrypt(aes, a, out);
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/* XOR zero-padded last block */
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for (i = 0; i < last; i++)
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*out++ ^= *in++;
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}
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}
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static void aes_ccm_encr_auth(void *aes, size_t M, u8 *x, u8 *a, u8 *auth)
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{
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size_t i;
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u8 tmp[AES_BLOCK_SIZE];
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wpa_hexdump_key(MSG_EXCESSIVE, "CCM T", x, M);
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/* U = T XOR S_0; S_0 = E(K, A_0) */
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WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], 0);
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aes_encrypt(aes, a, tmp);
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for (i = 0; i < M; i++)
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auth[i] = x[i] ^ tmp[i];
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wpa_hexdump_key(MSG_EXCESSIVE, "CCM U", auth, M);
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}
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static void aes_ccm_decr_auth(void *aes, size_t M, u8 *a, const u8 *auth, u8 *t)
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{
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size_t i;
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u8 tmp[AES_BLOCK_SIZE];
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wpa_hexdump_key(MSG_EXCESSIVE, "CCM U", auth, M);
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/* U = T XOR S_0; S_0 = E(K, A_0) */
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WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], 0);
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aes_encrypt(aes, a, tmp);
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for (i = 0; i < M; i++)
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t[i] = auth[i] ^ tmp[i];
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wpa_hexdump_key(MSG_EXCESSIVE, "CCM T", t, M);
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}
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/* AES-CCM with fixed L=2 and aad_len <= 30 assumption */
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static int aes_ccm_ae(const u8 *key, size_t key_len, const u8 *nonce,
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size_t M, const u8 *plain, size_t plain_len,
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const u8 *aad, size_t aad_len, u8 *crypt, u8 *auth)
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{
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const size_t L = 2;
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void *aes;
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u8 x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
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if (aad_len > 30 || M > AES_BLOCK_SIZE)
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return -1;
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aes = aes_encrypt_init(key, key_len);
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if (aes == NULL)
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return -1;
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aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, plain_len, x);
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aes_ccm_auth(aes, plain, plain_len, x);
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/* Encryption */
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aes_ccm_encr_start(L, nonce, a);
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aes_ccm_encr(aes, L, plain, plain_len, crypt, a);
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aes_ccm_encr_auth(aes, M, x, a, auth);
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aes_encrypt_deinit(aes);
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return 0;
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}
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/* AES-CCM with fixed L=2 and aad_len <= 30 assumption */
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static int aes_ccm_ad(const u8 *key, size_t key_len, const u8 *nonce,
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size_t M, const u8 *crypt, size_t crypt_len,
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const u8 *aad, size_t aad_len, const u8 *auth, u8 *plain)
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{
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const size_t L = 2;
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void *aes;
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u8 x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
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u8 t[AES_BLOCK_SIZE];
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if (aad_len > 30 || M > AES_BLOCK_SIZE)
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return -1;
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aes = aes_encrypt_init(key, key_len);
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if (aes == NULL)
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return -1;
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/* Decryption */
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aes_ccm_encr_start(L, nonce, a);
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aes_ccm_decr_auth(aes, M, a, auth, t);
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/* plaintext = msg XOR (S_1 | S_2 | ... | S_n) */
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aes_ccm_encr(aes, L, crypt, crypt_len, plain, a);
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aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, crypt_len, x);
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aes_ccm_auth(aes, plain, crypt_len, x);
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aes_encrypt_deinit(aes);
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if (os_memcmp(x, t, M) != 0) {
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wpa_printf(MSG_EXCESSIVE, "CCM: Auth mismatch");
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return -1;
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}
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return 0;
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}
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static void ccmp_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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@ -76,29 +274,13 @@ static void ccmp_aad_nonce(const struct ieee80211_hdr *hdr, const u8 *data,
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}
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static void xor_aes_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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u8 * ccmp_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[13];
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u8 aad[30], nonce[13];
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size_t aad_len;
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u8 b[AES_BLOCK_SIZE], x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
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void *aes;
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const u8 *m, *mpos, *mic;
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size_t mlen, last;
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int i;
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u8 *plain, *ppos;
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u8 t[8];
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size_t mlen;
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u8 *plain;
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if (data_len < 8 + 8)
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return NULL;
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@ -107,95 +289,15 @@ u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
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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 - 8;
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last = mlen % AES_BLOCK_SIZE;
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os_memset(aad, 0, sizeof(aad));
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ccmp_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, "CCMP AAD", &aad[2], aad_len);
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ccmp_aad_nonce(hdr, data, aad, &aad_len, nonce);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
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/* CCM: M=8 L=2, Adata=1, M' = (M-2)/2 = 3, L' = L-1 = 1 */
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/* A_i = Flags | Nonce N | Counter i */
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a[0] = 0x01; /* Flags = L' */
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os_memcpy(&a[1], nonce, 13);
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/* Decryption */
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mic = data + data_len - 8;
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wpa_hexdump(MSG_EXCESSIVE, "CCMP U", mic, 8);
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/* U = T XOR S_0; S_0 = E(K, A_0) */
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WPA_PUT_BE16(&a[14], 0);
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aes_encrypt(aes, a, x);
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for (i = 0; i < 8; i++)
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t[i] = mic[i] ^ x[i];
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wpa_hexdump(MSG_EXCESSIVE, "CCMP T", t, 8);
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/* plaintext = msg XOR (S_1 | S_2 | ... | S_n) */
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ppos = plain;
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mpos = m;
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for (i = 1; i <= mlen / AES_BLOCK_SIZE; i++) {
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WPA_PUT_BE16(&a[14], i);
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/* S_i = E(K, A_i) */
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aes_encrypt(aes, a, ppos);
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xor_aes_block(ppos, mpos);
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ppos += AES_BLOCK_SIZE;
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mpos += AES_BLOCK_SIZE;
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}
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if (last) {
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WPA_PUT_BE16(&a[14], i);
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aes_encrypt(aes, a, ppos);
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/* XOR zero-padded last block */
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for (i = 0; i < last; i++)
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*ppos++ ^= *mpos++;
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}
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wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
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/* Authentication */
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/* B_0: Flags | Nonce N | l(m) */
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b[0] = 0x40 /* Adata */ | (3 /* M' */ << 3) | 1 /* L' */;
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os_memcpy(&b[1], nonce, 13);
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WPA_PUT_BE16(&b[14], mlen);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP B_0", b, AES_BLOCK_SIZE);
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aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */
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wpa_hexdump(MSG_EXCESSIVE, "CCMP B_1", aad, AES_BLOCK_SIZE);
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xor_aes_block(aad, x);
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aes_encrypt(aes, aad, x); /* X_2 = E(K, X_1 XOR B_1) */
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wpa_hexdump(MSG_EXCESSIVE, "CCMP B_2", &aad[AES_BLOCK_SIZE],
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AES_BLOCK_SIZE);
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xor_aes_block(&aad[AES_BLOCK_SIZE], x);
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aes_encrypt(aes, &aad[AES_BLOCK_SIZE], x); /* X_3 = E(K, X_2 XOR B_2)
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*/
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ppos = plain;
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for (i = 0; i < mlen / AES_BLOCK_SIZE; i++) {
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/* X_i+1 = E(K, X_i XOR B_i) */
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xor_aes_block(x, ppos);
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ppos += AES_BLOCK_SIZE;
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aes_encrypt(aes, x, x);
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}
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if (last) {
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/* XOR zero-padded last block */
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for (i = 0; i < last; i++)
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x[i] ^= *ppos++;
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aes_encrypt(aes, x, x);
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}
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aes_encrypt_deinit(aes);
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if (os_memcmp(x, t, 8) != 0) {
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if (aes_ccm_ad(tk, 16, nonce, 8, data + 8, mlen, aad, aad_len,
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data + 8 + mlen, plain) < 0) {
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u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
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wpa_printf(MSG_INFO, "Invalid CCMP MIC in frame: A1=" MACSTR
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" A2=" MACSTR " A3=" MACSTR " seq=%u frag=%u",
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@ -203,10 +305,10 @@ u8 * ccmp_decrypt(const u8 *tk, const struct ieee80211_hdr *hdr,
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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, "CCMP decrypted", plain, mlen);
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os_free(plain);
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return NULL;
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}
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wpa_hexdump(MSG_EXCESSIVE, "CCMP decrypted", plain, mlen);
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*decrypted_len = mlen;
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return plain;
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@ -227,19 +329,14 @@ void ccmp_get_pn(u8 *pn, const u8 *data)
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u8 * ccmp_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[13];
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size_t aad_len;
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u8 b[AES_BLOCK_SIZE], x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE];
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void *aes;
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u8 *crypt, *pos, *ppos, *mpos;
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size_t plen, last;
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u8 aad[30], nonce[13];
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size_t aad_len, plen;
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u8 *crypt, *pos;
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struct ieee80211_hdr *hdr;
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int i;
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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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last = plen % AES_BLOCK_SIZE;
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crypt = os_malloc(hdrlen + 8 + plen + 8 + AES_BLOCK_SIZE);
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if (crypt == NULL)
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@ -258,91 +355,19 @@ u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
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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_memset(aad, 0, sizeof(aad));
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ccmp_aad_nonce(hdr, crypt + hdrlen, aad, &aad_len, nonce);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP AAD", aad, aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
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if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len,
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pos, pos + plen) < 0) {
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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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ccmp_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, "CCMP AAD", &aad[2], aad_len);
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wpa_hexdump(MSG_EXCESSIVE, "CCMP nonce", nonce, 13);
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/* Authentication */
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/* 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;
|
||||
|
|
|
|||
Loading…
Reference in New Issue