mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 20:22:09 +00:00
7ec7c4a9a6
Use the generic CCM aead chaining mode driver rather than a local implementation that sits right on top of the core AES cipher. This allows the use of accelerated implementations of either CCM as a whole or the CTR mode which it encapsulates. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
|
|
* Copyright 2003-2004, Instant802 Networks, Inc.
|
|
* Copyright 2005-2006, Devicescape Software, Inc.
|
|
*
|
|
* Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
|
|
*
|
|
* 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_ccm.h"
|
|
|
|
void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
|
|
u8 *data, size_t data_len, u8 *mic)
|
|
{
|
|
struct scatterlist assoc, pt, ct[2];
|
|
struct {
|
|
struct aead_request req;
|
|
u8 priv[crypto_aead_reqsize(tfm)];
|
|
} aead_req;
|
|
|
|
memset(&aead_req, 0, sizeof(aead_req));
|
|
|
|
sg_init_one(&pt, data, data_len);
|
|
sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
|
|
sg_init_table(ct, 2);
|
|
sg_set_buf(&ct[0], data, data_len);
|
|
sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
|
|
|
|
aead_request_set_tfm(&aead_req.req, tfm);
|
|
aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
|
|
aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0);
|
|
|
|
crypto_aead_encrypt(&aead_req.req);
|
|
}
|
|
|
|
int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
|
|
u8 *data, size_t data_len, u8 *mic)
|
|
{
|
|
struct scatterlist assoc, pt, ct[2];
|
|
struct {
|
|
struct aead_request req;
|
|
u8 priv[crypto_aead_reqsize(tfm)];
|
|
} aead_req;
|
|
|
|
memset(&aead_req, 0, sizeof(aead_req));
|
|
|
|
sg_init_one(&pt, data, data_len);
|
|
sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
|
|
sg_init_table(ct, 2);
|
|
sg_set_buf(&ct[0], data, data_len);
|
|
sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
|
|
|
|
aead_request_set_tfm(&aead_req.req, tfm);
|
|
aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
|
|
aead_request_set_crypt(&aead_req.req, ct, &pt,
|
|
data_len + IEEE80211_CCMP_MIC_LEN, b_0);
|
|
|
|
return crypto_aead_decrypt(&aead_req.req);
|
|
}
|
|
|
|
struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
|
|
{
|
|
struct crypto_aead *tfm;
|
|
int err;
|
|
|
|
tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(tfm))
|
|
return tfm;
|
|
|
|
err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
|
|
if (!err)
|
|
err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
|
|
if (!err)
|
|
return tfm;
|
|
|
|
crypto_free_aead(tfm);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void ieee80211_aes_key_free(struct crypto_aead *tfm)
|
|
{
|
|
crypto_free_aead(tfm);
|
|
}
|