80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* AES-GMAC for IEEE 802.11 BIP-GMAC-128 and BIP-GMAC-256
|
|
* Copyright 2015, Qualcomm Atheros, Inc.
|
|
*/
|
|
|
|
#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);
|
|
}
|