--- /dev/null
+--- a/net/mac80211/Kconfig
++++ b/net/mac80211/Kconfig
+@@ -5,7 +5,6 @@ config MAC80211
+ depends on CRYPTO
+ depends on CRYPTO_ARC4
+ depends on CRYPTO_AES
+- depends on CRYPTO_CCM
+ depends on CRC32
+ select BACKPORT_AVERAGE
+ ---help---
+--- a/net/mac80211/aes_ccm.c
++++ b/net/mac80211/aes_ccm.c
+@@ -2,8 +2,6 @@
+ * Copyright 2003-2004, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ *
+- * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
+- *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+@@ -19,75 +17,134 @@
+ #include "key.h"
+ #include "aes_ccm.h"
+
+-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+- u8 *data, size_t data_len, u8 *mic)
++static void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *scratch, u8 *a)
+ {
+- struct scatterlist assoc, pt, ct[2];
+- struct {
+- struct aead_request req;
+- u8 priv[crypto_aead_reqsize(tfm)];
+- } aead_req;
+-
+- memset(&aead_req, 0, sizeof(aead_req));
+-
+- sg_init_one(&pt, data, data_len);
+- sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
+- sg_init_table(ct, 2);
+- sg_set_buf(&ct[0], data, data_len);
+- sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
+-
+- aead_request_set_tfm(&aead_req.req, tfm);
+- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
+- aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0);
++ int i;
++ u8 *b_0, *aad, *b, *s_0;
+
+- crypto_aead_encrypt(&aead_req.req);
++ b_0 = scratch + 3 * AES_BLOCK_SIZE;
++ aad = scratch + 4 * AES_BLOCK_SIZE;
++ b = scratch;
++ s_0 = scratch + AES_BLOCK_SIZE;
++
++ crypto_cipher_encrypt_one(tfm, b, b_0);
++
++ /* Extra Authenticate-only data (always two AES blocks) */
++ for (i = 0; i < AES_BLOCK_SIZE; i++)
++ aad[i] ^= b[i];
++ crypto_cipher_encrypt_one(tfm, b, aad);
++
++ aad += AES_BLOCK_SIZE;
++
++ for (i = 0; i < AES_BLOCK_SIZE; i++)
++ aad[i] ^= b[i];
++ crypto_cipher_encrypt_one(tfm, a, aad);
++
++ /* Mask out bits from auth-only-b_0 */
++ b_0[0] &= 0x07;
++
++ /* S_0 is used to encrypt T (= MIC) */
++ b_0[14] = 0;
++ b_0[15] = 0;
++ crypto_cipher_encrypt_one(tfm, s_0, b_0);
+ }
+
+-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+- u8 *data, size_t data_len, u8 *mic)
++
++void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
++ u8 *data, size_t data_len,
++ u8 *cdata, u8 *mic)
+ {
+- struct scatterlist assoc, pt, ct[2];
+- struct {
+- struct aead_request req;
+- u8 priv[crypto_aead_reqsize(tfm)];
+- } aead_req;
+-
+- memset(&aead_req, 0, sizeof(aead_req));
+-
+- sg_init_one(&pt, data, data_len);
+- sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
+- sg_init_table(ct, 2);
+- sg_set_buf(&ct[0], data, data_len);
+- sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
+-
+- aead_request_set_tfm(&aead_req.req, tfm);
+- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
+- aead_request_set_crypt(&aead_req.req, ct, &pt,
+- data_len + IEEE80211_CCMP_MIC_LEN, b_0);
++ int i, j, last_len, num_blocks;
++ u8 *pos, *cpos, *b, *s_0, *e, *b_0;
++
++ b = scratch;
++ s_0 = scratch + AES_BLOCK_SIZE;
++ e = scratch + 2 * AES_BLOCK_SIZE;
++ b_0 = scratch + 3 * AES_BLOCK_SIZE;
++
++ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
++ last_len = data_len % AES_BLOCK_SIZE;
++ aes_ccm_prepare(tfm, scratch, b);
++
++ /* Process payload blocks */
++ pos = data;
++ cpos = cdata;
++ for (j = 1; j <= num_blocks; j++) {
++ int blen = (j == num_blocks && last_len) ?
++ last_len : AES_BLOCK_SIZE;
++
++ /* Authentication followed by encryption */
++ for (i = 0; i < blen; i++)
++ b[i] ^= pos[i];
++ crypto_cipher_encrypt_one(tfm, b, b);
++
++ b_0[14] = (j >> 8) & 0xff;
++ b_0[15] = j & 0xff;
++ crypto_cipher_encrypt_one(tfm, e, b_0);
++ for (i = 0; i < blen; i++)
++ *cpos++ = *pos++ ^ e[i];
++ }
+
+- return crypto_aead_decrypt(&aead_req.req);
++ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++)
++ mic[i] = b[i] ^ s_0[i];
+ }
+
+-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
++
++int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
++ u8 *cdata, size_t data_len, u8 *mic, u8 *data)
+ {
+- struct crypto_aead *tfm;
+- int err;
++ int i, j, last_len, num_blocks;
++ u8 *pos, *cpos, *b, *s_0, *a, *b_0;
+
+- tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
+- if (IS_ERR(tfm))
+- return tfm;
+-
+- err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
+- if (!err)
+- err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
+- if (!err)
+- return tfm;
++ b = scratch;
++ s_0 = scratch + AES_BLOCK_SIZE;
++ a = scratch + 2 * AES_BLOCK_SIZE;
++ b_0 = scratch + 3 * AES_BLOCK_SIZE;
++
++ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
++ last_len = data_len % AES_BLOCK_SIZE;
++ aes_ccm_prepare(tfm, scratch, a);
++
++ /* Process payload blocks */
++ cpos = cdata;
++ pos = data;
++ for (j = 1; j <= num_blocks; j++) {
++ int blen = (j == num_blocks && last_len) ?
++ last_len : AES_BLOCK_SIZE;
++
++ /* Decryption followed by authentication */
++ b_0[14] = (j >> 8) & 0xff;
++ b_0[15] = j & 0xff;
++ crypto_cipher_encrypt_one(tfm, b, b_0);
++ for (i = 0; i < blen; i++) {
++ *pos = *cpos++ ^ b[i];
++ a[i] ^= *pos++;
++ }
++ crypto_cipher_encrypt_one(tfm, a, a);
++ }
++
++ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++) {
++ if ((mic[i] ^ s_0[i]) != a[i])
++ return -1;
++ }
+
+- crypto_free_aead(tfm);
+- return ERR_PTR(err);
++ return 0;
+ }
+
+-void ieee80211_aes_key_free(struct crypto_aead *tfm)
++
++struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[])
++{
++ struct crypto_cipher *tfm;
++
++ tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
++ if (!IS_ERR(tfm))
++ crypto_cipher_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
++
++ return tfm;
++}
++
++
++void ieee80211_aes_key_free(struct crypto_cipher *tfm)
+ {
+- crypto_free_aead(tfm);
++ crypto_free_cipher(tfm);
+ }
+--- a/net/mac80211/aes_ccm.h
++++ b/net/mac80211/aes_ccm.h
+@@ -12,11 +12,13 @@
+
+ #include <linux/crypto.h>
+
+-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[]);
+-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+- u8 *data, size_t data_len, u8 *mic);
+-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+- u8 *data, size_t data_len, u8 *mic);
+-void ieee80211_aes_key_free(struct crypto_aead *tfm);
++struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]);
++void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
++ u8 *data, size_t data_len,
++ u8 *cdata, u8 *mic);
++int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
++ u8 *cdata, size_t data_len,
++ u8 *mic, u8 *data);
++void ieee80211_aes_key_free(struct crypto_cipher *tfm);
+
+ #endif /* AES_CCM_H */
+--- a/net/mac80211/key.h
++++ b/net/mac80211/key.h
+@@ -84,7 +84,7 @@ struct ieee80211_key {
+ * Management frames.
+ */
+ u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
+- struct crypto_aead *tfm;
++ struct crypto_cipher *tfm;
+ u32 replays; /* dot11RSNAStatsCCMPReplays */
+ } ccmp;
+ struct {
+--- a/net/mac80211/wpa.c
++++ b/net/mac80211/wpa.c
+@@ -301,16 +301,22 @@ ieee80211_crypto_tkip_decrypt(struct iee
+ }
+
+
+-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
++static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
+ int encrypted)
+ {
+ __le16 mask_fc;
+ int a4_included, mgmt;
+ u8 qos_tid;
+- u16 len_a;
++ u8 *b_0, *aad;
++ u16 data_len, len_a;
+ unsigned int hdrlen;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+
++ memset(scratch, 0, 6 * AES_BLOCK_SIZE);
++
++ b_0 = scratch + 3 * AES_BLOCK_SIZE;
++ aad = scratch + 4 * AES_BLOCK_SIZE;
++
+ /*
+ * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
+ * Retry, PwrMgt, MoreData; set Protected
+@@ -332,21 +338,20 @@ static void ccmp_special_blocks(struct s
+ else
+ qos_tid = 0;
+
+- /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
+- * mode authentication are not allowed to collide, yet both are derived
+- * from this vector b_0. We only set L := 1 here to indicate that the
+- * data size can be represented in (L+1) bytes. The CCM layer will take
+- * care of storing the data length in the top (L+1) bytes and setting
+- * and clearing the other bits as is required to derive the two IVs.
+- */
+- b_0[0] = 0x1;
++ data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN;
++ if (encrypted)
++ data_len -= IEEE80211_CCMP_MIC_LEN;
+
++ /* First block, b_0 */
++ b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
+ /* Nonce: Nonce Flags | A2 | PN
+ * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
+ */
+ b_0[1] = qos_tid | (mgmt << 4);
+ memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
+ memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
++ /* l(m) */
++ put_unaligned_be16(data_len, &b_0[14]);
+
+ /* AAD (extra authenticate-only data) / masked 802.11 header
+ * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
+@@ -402,8 +407,7 @@ static int ccmp_encrypt_skb(struct ieee8
+ u8 *pos;
+ u8 pn[6];
+ u64 pn64;
+- u8 aad[2 * AES_BLOCK_SIZE];
+- u8 b_0[AES_BLOCK_SIZE];
++ u8 scratch[6 * AES_BLOCK_SIZE];
+
+ if (info->control.hw_key &&
+ !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
+@@ -456,9 +460,9 @@ static int ccmp_encrypt_skb(struct ieee8
+ return 0;
+
+ pos += IEEE80211_CCMP_HDR_LEN;
+- ccmp_special_blocks(skb, pn, b_0, aad, 0);
+- ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
+- skb_put(skb, IEEE80211_CCMP_MIC_LEN));
++ ccmp_special_blocks(skb, pn, scratch, 0);
++ ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len,
++ pos, skb_put(skb, IEEE80211_CCMP_MIC_LEN));
+
+ return 0;
+ }
+@@ -521,16 +525,16 @@ ieee80211_crypto_ccmp_decrypt(struct iee
+ }
+
+ if (!(status->flag & RX_FLAG_DECRYPTED)) {
+- u8 aad[2 * AES_BLOCK_SIZE];
+- u8 b_0[AES_BLOCK_SIZE];
++ u8 scratch[6 * AES_BLOCK_SIZE];
+ /* hardware didn't decrypt/verify MIC */
+- ccmp_special_blocks(skb, pn, b_0, aad, 1);
++ ccmp_special_blocks(skb, pn, scratch, 1);
+
+ if (ieee80211_aes_ccm_decrypt(
+- key->u.ccmp.tfm, b_0, aad,
++ key->u.ccmp.tfm, scratch,
+ skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
+ data_len,
+- skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
++ skb->data + skb->len - IEEE80211_CCMP_MIC_LEN,
++ skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN))
+ return RX_DROP_UNUSABLE;
+ }
+
projects / 12.09 / openwrt.git / blobdiff