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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /net/mac80211/aes_cmac.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
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.c | 92 |
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); +} |