mirror of https://gitee.com/openkylin/linux.git
85 lines
2.1 KiB
C
85 lines
2.1 KiB
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/crypto.h>
|
|
#include <linux/err.h>
|
|
#include <crypto/aes.h>
|
|
|
|
#include <net/mac80211.h>
|
|
#include "key.h"
|
|
#include "aes_gmac.h"
|
|
|
|
#define GMAC_MIC_LEN 16
|
|
#define GMAC_NONCE_LEN 12
|
|
#define AAD_LEN 20
|
|
|
|
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[3], ct[1];
|
|
char aead_req_data[sizeof(struct aead_request) +
|
|
crypto_aead_reqsize(tfm)]
|
|
__aligned(__alignof__(struct aead_request));
|
|
struct aead_request *aead_req = (void *)aead_req_data;
|
|
u8 zero[GMAC_MIC_LEN], iv[AES_BLOCK_SIZE];
|
|
|
|
if (data_len < GMAC_MIC_LEN)
|
|
return -EINVAL;
|
|
|
|
memset(aead_req, 0, sizeof(aead_req_data));
|
|
|
|
memset(zero, 0, GMAC_MIC_LEN);
|
|
sg_init_table(sg, 3);
|
|
sg_set_buf(&sg[0], aad, AAD_LEN);
|
|
sg_set_buf(&sg[1], data, data_len - GMAC_MIC_LEN);
|
|
sg_set_buf(&sg[2], zero, 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;
|
|
|
|
sg_init_table(ct, 1);
|
|
sg_set_buf(&ct[0], mic, GMAC_MIC_LEN);
|
|
|
|
aead_request_set_tfm(aead_req, tfm);
|
|
aead_request_set_assoc(aead_req, sg, AAD_LEN + data_len);
|
|
aead_request_set_crypt(aead_req, NULL, ct, 0, iv);
|
|
|
|
crypto_aead_encrypt(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);
|
|
}
|