From 52409fae3e4b8d16b68b61902fc09075cd97b75d Mon Sep 17 00:00:00 2001 From: Dominik Sliwa Date: Sun, 2 Jul 2017 16:41:37 +0200 Subject: Backports generated from 4.11 kernel Initial commit. Signed-off-by: Dominik Sliwa --- net/mac80211/aes_cmac.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 net/mac80211/aes_cmac.c (limited to 'net/mac80211/aes_cmac.c') diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c new file mode 100644 index 0000000..2fb6558 --- /dev/null +++ b/net/mac80211/aes_cmac.c @@ -0,0 +1,71 @@ +/* + * AES-128-CMAC with TLen 16 for IEEE 802.11w BIP + * Copyright 2008, Jouni Malinen + * + * 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. + */ + +#include +#include +#include +#include +#include +#include + +#include +#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]; + + desc->tfm = tfm; + + crypto_shash_init(desc); + crypto_shash_update(desc, aad, AAD_LEN); + 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); + + desc->tfm = tfm; + + crypto_shash_init(desc); + crypto_shash_update(desc, aad, AAD_LEN); + 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)) + crypto_shash_setkey(tfm, key, key_len); + + return tfm; +} + +void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm) +{ + crypto_free_shash(tfm); +} -- cgit v1.2.3