forked from Minki/linux
2d5d4b0a6d
When BIP is used to protect Beacon frames, the Timestamp field is masked to zero. Otherwise, the BIP processing is identical to the way it was already used with group-addressed Robust Management frames. Signed-off-by: Jouni Malinen <jouni@codeaurora.org> Link: https://lore.kernel.org/r/20200222132548.20835-4-jouni@codeaurora.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AES-GMAC for IEEE 802.11 BIP-GMAC-128 and BIP-GMAC-256
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* Copyright 2015, Qualcomm Atheros, Inc.
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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/err.h>
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#include <crypto/aead.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_gmac.h"
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int ieee80211_aes_gmac(struct crypto_aead *tfm, const u8 *aad, u8 *nonce,
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const u8 *data, size_t data_len, u8 *mic)
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{
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struct scatterlist sg[5];
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u8 *zero, *__aad, iv[AES_BLOCK_SIZE];
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struct aead_request *aead_req;
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int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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const __le16 *fc;
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if (data_len < GMAC_MIC_LEN)
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return -EINVAL;
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aead_req = kzalloc(reqsize + GMAC_MIC_LEN + GMAC_AAD_LEN, GFP_ATOMIC);
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if (!aead_req)
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return -ENOMEM;
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zero = (u8 *)aead_req + reqsize;
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__aad = zero + GMAC_MIC_LEN;
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memcpy(__aad, aad, GMAC_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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sg_init_table(sg, 5);
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sg_set_buf(&sg[0], __aad, GMAC_AAD_LEN);
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sg_set_buf(&sg[1], zero, 8);
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sg_set_buf(&sg[2], data + 8, data_len - 8 - GMAC_MIC_LEN);
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sg_set_buf(&sg[3], zero, GMAC_MIC_LEN);
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sg_set_buf(&sg[4], mic, GMAC_MIC_LEN);
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} else {
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sg_init_table(sg, 4);
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sg_set_buf(&sg[0], __aad, GMAC_AAD_LEN);
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sg_set_buf(&sg[1], data, data_len - GMAC_MIC_LEN);
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sg_set_buf(&sg[2], zero, GMAC_MIC_LEN);
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sg_set_buf(&sg[3], mic, GMAC_MIC_LEN);
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}
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memcpy(iv, nonce, GMAC_NONCE_LEN);
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memset(iv + GMAC_NONCE_LEN, 0, sizeof(iv) - GMAC_NONCE_LEN);
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iv[AES_BLOCK_SIZE - 1] = 0x01;
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_crypt(aead_req, sg, sg, 0, iv);
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aead_request_set_ad(aead_req, GMAC_AAD_LEN + data_len);
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crypto_aead_encrypt(aead_req);
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kzfree(aead_req);
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return 0;
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}
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struct crypto_aead *ieee80211_aes_gmac_key_setup(const u8 key[],
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size_t key_len)
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{
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struct crypto_aead *tfm;
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int err;
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tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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return tfm;
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err = crypto_aead_setkey(tfm, key, key_len);
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if (!err)
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err = crypto_aead_setauthsize(tfm, GMAC_MIC_LEN);
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if (!err)
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return tfm;
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crypto_free_aead(tfm);
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return ERR_PTR(err);
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}
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void ieee80211_aes_gmac_key_free(struct crypto_aead *tfm)
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{
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crypto_free_aead(tfm);
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}
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