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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/mac80211/aes_cmac.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/mac80211/aes_cmac.c')
-rw-r--r--net/mac80211/aes_cmac.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
new file mode 100644
index 000000000..48c04f89d
--- /dev/null
+++ b/net/mac80211/aes_cmac.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
+ * Copyright 2008, Jouni Malinen <j@w1.fi>
+ * Copyright (C) 2020 Intel Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <crypto/aes.h>
+
+#include <net/mac80211.h>
+#include "key.h"
+#include "aes_cmac.h"
+
+#define CMAC_TLEN 8 /* CMAC TLen = 64 bits (8 octets) */
+#define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */
+#define AAD_LEN 20
+
+static const u8 zero[CMAC_TLEN_256];
+
+void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic)
+{
+ SHASH_DESC_ON_STACK(desc, tfm);
+ u8 out[AES_BLOCK_SIZE];
+ const __le16 *fc;
+
+ desc->tfm = tfm;
+
+ crypto_shash_init(desc);
+ crypto_shash_update(desc, aad, AAD_LEN);
+ fc = (const __le16 *)aad;
+ if (ieee80211_is_beacon(*fc)) {
+ /* mask Timestamp field to zero */
+ crypto_shash_update(desc, zero, 8);
+ crypto_shash_update(desc, data + 8, data_len - 8 - CMAC_TLEN);
+ } else {
+ crypto_shash_update(desc, data, data_len - CMAC_TLEN);
+ }
+ crypto_shash_finup(desc, zero, CMAC_TLEN, out);
+
+ memcpy(mic, out, CMAC_TLEN);
+}
+
+void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic)
+{
+ SHASH_DESC_ON_STACK(desc, tfm);
+ const __le16 *fc;
+
+ desc->tfm = tfm;
+
+ crypto_shash_init(desc);
+ crypto_shash_update(desc, aad, AAD_LEN);
+ fc = (const __le16 *)aad;
+ if (ieee80211_is_beacon(*fc)) {
+ /* mask Timestamp field to zero */
+ crypto_shash_update(desc, zero, 8);
+ crypto_shash_update(desc, data + 8,
+ data_len - 8 - CMAC_TLEN_256);
+ } else {
+ crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
+ }
+ crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic);
+}
+
+struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
+ size_t key_len)
+{
+ struct crypto_shash *tfm;
+
+ tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
+ if (!IS_ERR(tfm)) {
+ int err = crypto_shash_setkey(tfm, key, key_len);
+
+ if (err) {
+ crypto_free_shash(tfm);
+ return ERR_PTR(err);
+ }
+ }
+
+ return tfm;
+}
+
+void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
+{
+ crypto_free_shash(tfm);
+}