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92 lines
2.2 KiB
92 lines
2.2 KiB
// 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 <[email protected]> |
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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 CMAC_TLEN 8 /* CMAC TLen = 64 bits (8 octets) */ |
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#define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */ |
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#define AAD_LEN 20 |
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static const u8 zero[CMAC_TLEN_256]; |
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void 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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{ |
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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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crypto_shash_init(desc); |
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crypto_shash_update(desc, aad, AAD_LEN); |
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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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crypto_shash_update(desc, zero, 8); |
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crypto_shash_update(desc, data + 8, data_len - 8 - CMAC_TLEN); |
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} else { |
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crypto_shash_update(desc, data, data_len - CMAC_TLEN); |
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} |
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crypto_shash_finup(desc, zero, CMAC_TLEN, out); |
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memcpy(mic, out, CMAC_TLEN); |
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} |
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void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad, |
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const u8 *data, size_t data_len, u8 *mic) |
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{ |
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SHASH_DESC_ON_STACK(desc, tfm); |
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const __le16 *fc; |
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desc->tfm = tfm; |
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crypto_shash_init(desc); |
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crypto_shash_update(desc, aad, AAD_LEN); |
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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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crypto_shash_update(desc, zero, 8); |
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crypto_shash_update(desc, data + 8, |
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data_len - 8 - CMAC_TLEN_256); |
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} else { |
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crypto_shash_update(desc, data, data_len - CMAC_TLEN_256); |
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} |
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crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic); |
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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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