/*
 * 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;
}

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);
}
i/linux/net-next.git/diff/net/mac80211?h=nds-private-remove&amp;id=fcd25166d950bc0fae4179b9d16995a1a2270810'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/mac80211'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=fcd25166d950bc0fae4179b9d16995a1a2270810'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=fcd25166d950bc0fae4179b9d16995a1a2270810'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/mac80211?h=nds-private-remove&amp;id=fcd25166d950bc0fae4179b9d16995a1a2270810'>mac80211</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/mac80211?h=nds-private-remove&amp;id=fcd25166d950bc0fae4179b9d16995a1a2270810&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2017-02-10 14:31:51 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=0d2164af2696821b27b04bebd8420b0e881bf44d'>Merge tag 'mac80211-next-for-davem-2017-02-09' of git://git.kernel.org/pub/sc...</a></td><td>David S. Miller</td><td>14</td><td><span class='deletions'>-178</span>/<span class='insertions'>+105</span></td></tr>
<tr><td><span title='2017-02-09 15:18:24 +0100'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=f181d6a3bcc35633facf5f3925699021c13492c5'>mac80211: fix CSA in IBSS mode</a></td><td>Koen Vandeputte</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2017-02-09 15:17:30 +0100'>2017-02-09</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=8585989d146c61dd073d2135c5bb11d0f979d576'>cfg80211: fix NAN bands definition</a></td><td>Luca Coelho</td><td>2</td><td><span class='deletions'>-10</span>/<span class='insertions'>+10</span></td></tr>
<tr><td><span title='2017-02-08 10:43:40 +0100'>2017-02-08</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=bee427b86217b78a0a5fc85575cc155e4c32bbf9'>cfg80211: Pass new RSSI level in CQM RSSI notification</a></td><td>Andrzej Zaborowski</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2017-02-08 10:43:04 +0100'>2017-02-08</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=769f07d8f0fb6a68a0eda6308bbe890bff894fd7'>mac80211: Pass new RSSI level in CQM RSSI notification</a></td><td>Andrzej Zaborowski</td><td>2</td><td><span class='deletions'>-7</span>/<span class='insertions'>+11</span></td></tr>
<tr><td><span title='2017-02-08 10:05:07 +0100'>2017-02-08</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=b2347a322d1f6f93f1a39fe17ed08628fc959351'>mac80211: check for allocation failure in debugfs code</a></td><td>Dan Carpenter</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2017-02-08 09:19:33 +0100'>2017-02-08</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=26717828b75dd5c46e97f7f4a9b937d038bb2852'>mac80211: aes-cmac: switch to shash CMAC driver</a></td><td>Ard Biesheuvel</td><td>3</td><td><span class='deletions'>-107</span>/<span class='insertions'>+32</span></td></tr>
<tr><td><span title='2017-02-08 09:19:17 +0100'>2017-02-08</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=fe8de3da13bdbcbe8b583a3bbadf677da0f04f83'>mac80211: fils_aead: Use crypto api CMAC shash rather than bare cipher</a></td><td>Ard Biesheuvel</td><td>3</td><td><span class='deletions'>-45</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2017-02-07 16:29:30 -0500'>2017-02-07</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/mac80211?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</a></td><td>David S. Miller