Release 4.15 net/mac80211/aes_gmac.c

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
172
65.40%
1
33.33%
Ard Biesheuvel
67
25.48%
1
33.33%
Herbert Xu
24
9.13%
1
33.33%
Total
263
100.00%
3
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
88
100.00%
2
100.00%
Total
88
100.00%
2
100.00%



void ieee80211_aes_gmac_key_free(struct crypto_aead *tfm)
{
	crypto_free_aead(tfm);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
298
76.21%
2
40.00%
Ard Biesheuvel
67
17.14%
1
20.00%
Herbert Xu
26
6.65%
2
40.00%
Total
391
100.00%
5
100.00%
Directory: net/mac80211

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.