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Release 4.14 net/mac80211/aes_gmac.c

Directory: net/mac80211
 * 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 <linux/kernel.h>
#include <linux/types.h>
#include <linux/err.h>
#include <crypto/aead.h>
#include <crypto/aes.h>

#include <net/mac80211.h>
#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; }


Jouni Malinen17265.40%133.33%
Ard Biesheuvel6725.48%133.33%
Herbert Xu249.13%133.33%

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); }


Jouni Malinen88100.00%2100.00%

void ieee80211_aes_gmac_key_free(struct crypto_aead *tfm) { crypto_free_aead(tfm); }


Jouni Malinen15100.00%1100.00%

Overall Contributors

Jouni Malinen29876.21%240.00%
Ard Biesheuvel6717.14%120.00%
Herbert Xu266.65%240.00%
Directory: net/mac80211
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