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_gmac.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 net/mac80211/aes_gmac.c (limited to 'net/mac80211/aes_gmac.c') diff --git a/net/mac80211/aes_gmac.c b/net/mac80211/aes_gmac.c new file mode 100644 index 0000000..bd72a86 --- /dev/null +++ b/net/mac80211/aes_gmac.c @@ -0,0 +1,82 @@ +/* + * AES-GMAC for IEEE 802.11 BIP-GMAC-128 and BIP-GMAC-256 + * Copyright 2015, Qualcomm Atheros, Inc. + * + * 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 "key.h" +#include "aes_gmac.h" + +int ieee80211_aes_gmac(struct crypto_aead *tfm, const u8 *aad, u8 *nonce, + const u8 *data, size_t data_len, u8 *mic) +{ + struct scatterlist sg[4]; + u8 *zero, *__aad, iv[AES_BLOCK_SIZE]; + struct aead_request *aead_req; + int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); + + if (data_len < GMAC_MIC_LEN) + return -EINVAL; + + aead_req = kzalloc(reqsize + GMAC_MIC_LEN + GMAC_AAD_LEN, GFP_ATOMIC); + if (!aead_req) + return -ENOMEM; + + zero = (u8 *)aead_req + reqsize; + __aad = zero + GMAC_MIC_LEN; + memcpy(__aad, aad, GMAC_AAD_LEN); + + sg_init_table(sg, 4); + sg_set_buf(&sg[0], __aad, GMAC_AAD_LEN); + sg_set_buf(&sg[1], data, data_len - GMAC_MIC_LEN); + sg_set_buf(&sg[2], zero, GMAC_MIC_LEN); + sg_set_buf(&sg[3], mic, GMAC_MIC_LEN); + + memcpy(iv, nonce, GMAC_NONCE_LEN); + memset(iv + GMAC_NONCE_LEN, 0, sizeof(iv) - GMAC_NONCE_LEN); + iv[AES_BLOCK_SIZE - 1] = 0x01; + + aead_request_set_tfm(aead_req, tfm); + aead_request_set_crypt(aead_req, sg, sg, 0, iv); + aead_request_set_ad(aead_req, GMAC_AAD_LEN + data_len); + + crypto_aead_encrypt(aead_req); + kzfree(aead_req); + + return 0; +} + +struct crypto_aead *ieee80211_aes_gmac_key_setup(const u8 key[], + size_t key_len) +{ + struct crypto_aead *tfm; + int err; + + tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(tfm)) + return tfm; + + err = crypto_aead_setkey(tfm, key, key_len); + if (!err) + err = crypto_aead_setauthsize(tfm, GMAC_MIC_LEN); + if (!err) + return tfm; + + crypto_free_aead(tfm); + return ERR_PTR(err); +} + +void ieee80211_aes_gmac_key_free(struct crypto_aead *tfm) +{ + crypto_free_aead(tfm); +} -- cgit v1.2.3