Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
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* Copyright 2008, Jouni Malinen <j@w1.fi>
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* Copyright (C) 2020 Intel Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <crypto/aes.h>
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#include <net/mac80211.h>
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#include "key.h"
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#include "aes_cmac.h"
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#define AAD_LEN 20
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static const u8 zero[IEEE80211_CMAC_256_MIC_LEN];
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int ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
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const u8 *data, size_t data_len, u8 *mic,
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unsigned int mic_len)
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{
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int err;
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SHASH_DESC_ON_STACK(desc, tfm);
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u8 out[AES_BLOCK_SIZE];
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const __le16 *fc;
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desc->tfm = tfm;
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err = crypto_shash_init(desc);
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if (err)
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return err;
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err = crypto_shash_update(desc, aad, AAD_LEN);
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if (err)
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return err;
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fc = (const __le16 *)aad;
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if (ieee80211_is_beacon(*fc)) {
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/* mask Timestamp field to zero */
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err = crypto_shash_update(desc, zero, 8);
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if (err)
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return err;
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err = crypto_shash_update(desc, data + 8,
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data_len - 8 - mic_len);
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if (err)
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return err;
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} else {
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err = crypto_shash_update(desc, data, data_len - mic_len);
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if (err)
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return err;
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}
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err = crypto_shash_finup(desc, zero, mic_len, out);
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if (err)
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return err;
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memcpy(mic, out, mic_len);
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return 0;
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}
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struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
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size_t key_len)
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{
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struct crypto_shash *tfm;
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tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
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if (!IS_ERR(tfm)) {
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int err = crypto_shash_setkey(tfm, key, key_len);
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if (err) {
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crypto_free_shash(tfm);
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return ERR_PTR(err);
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}
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}
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return tfm;
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}
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void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
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{
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crypto_free_shash(tfm);
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}
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