/*
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* Copyright (c) 2015 South Silicon Valley Microelectronics Inc.
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* Copyright (c) 2015 iComm Corporation
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_arp.h>
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#include <asm/string.h>
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#include <linux/wireless.h>
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#include <linux/ieee80211.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include "sec.h"
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#define PRINT_DEBUG 0
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#define AES_BLOCK_LEN 16
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#define CCMP_HDR_LEN 8
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#define CCMP_MIC_LEN 8
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#define CCMP_PN_LEN 6
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#ifdef MULTI_THREAD_ENCRYPT
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int prepare_mask = 0x0b0e0e0f;
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#endif
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struct lib80211_ccmp_data {
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u8 key[CCMP_TK_LEN];
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int key_set;
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u8 tx_pn[CCMP_PN_LEN];
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u8 rx_pn[CCMP_PN_LEN];
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#ifdef MULTI_THREAD_ENCRYPT
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u8 pre_rx_pn[CCMP_PN_LEN];
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#endif
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u32 dot11RSNAStatsCCMPFormatErrors;
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u32 dot11RSNAStatsCCMPReplays;
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u32 dot11RSNAStatsCCMPDecryptErrors;
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int key_idx;
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struct crypto_cipher *tfm;
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#ifndef MULTI_THREAD_ENCRYPT
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u8 tx_b0[AES_BLOCK_LEN], tx_b[AES_BLOCK_LEN],
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tx_e[AES_BLOCK_LEN], tx_s0[AES_BLOCK_LEN];
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u8 rx_b0[AES_BLOCK_LEN], rx_b[AES_BLOCK_LEN], rx_a[AES_BLOCK_LEN];
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#else
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u8 *tx_b0, *tx_b, *tx_e, *tx_s0;
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u8 *rx_b0, *rx_b, *rx_a;
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#endif
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};
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static inline void lib80211_ccmp_aes_encrypt(struct crypto_cipher *tfm,
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const u8 pt[16], u8 ct[16])
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{
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crypto_cipher_encrypt_one(tfm, ct, pt);
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}
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static void *lib80211_ccmp_init(int key_idx)
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{
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struct lib80211_ccmp_data *priv;
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const char *cipher_name = "aes";
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#ifdef MULTI_THREAD_ENCRYPT
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unsigned int buf_size = num_present_cpus()*AES_BLOCK_LEN*sizeof(u8);
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#endif
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priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
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if (priv == NULL)
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goto fail;
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priv->key_idx = key_idx;
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priv->tfm = crypto_alloc_cipher(cipher_name, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(priv->tfm)) {
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printk(KERN_ERR "Failed to allocate cipher %s\n", cipher_name);
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priv->tfm = NULL;
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goto fail;
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}
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else
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{
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printk(KERN_ERR "Found %s in driver %s (M %s).\n",
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priv->tfm->base.__crt_alg->cra_name,
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priv->tfm->base.__crt_alg->cra_driver_name,
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priv->tfm->base.__crt_alg->cra_module->name);
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}
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#ifdef MULTI_THREAD_ENCRYPT
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priv->tx_b0 = priv->tx_b = priv->tx_e = priv->tx_s0 = NULL;
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priv->tx_b0 = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->tx_b = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->tx_e = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->tx_s0 = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->rx_b0 = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->rx_b = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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priv->rx_a = (u8 *)kzalloc(buf_size, GFP_ATOMIC);
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if( (priv->tx_b0 == NULL) || (priv->tx_b == NULL) || (priv->tx_e == NULL) ||
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(priv->tx_s0 == NULL) ||(priv->rx_b0 == NULL) || (priv->rx_b == NULL) || (priv->rx_a == NULL) )
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{
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printk("#######fail to create memory for ccmp!!!\n");
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goto fail;
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}
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#endif
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return priv;
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fail:
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if (priv) {
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if (priv->tfm)
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crypto_free_cipher(priv->tfm);
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#ifdef MULTI_THREAD_ENCRYPT
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if(priv->tx_b0 != NULL)
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kfree(priv->tx_b0);
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if(priv->tx_b != NULL)
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kfree(priv->tx_b);
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if(priv->tx_e != NULL)
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kfree(priv->tx_e);
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if(priv->tx_s0 != NULL)
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kfree(priv->tx_s0);
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if(priv->rx_b0 != NULL)
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kfree(priv->rx_b0);
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if(priv->rx_b != NULL)
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kfree(priv->rx_b);
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if(priv->rx_a != NULL)
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kfree(priv->rx_a);
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#endif
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kfree(priv);
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}
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return NULL;
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}
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static void lib80211_ccmp_deinit(void *priv)
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{
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struct lib80211_ccmp_data *_priv = priv;
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if (_priv && _priv->tfm)
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crypto_free_cipher(_priv->tfm);
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#ifdef MULTI_THREAD_ENCRYPT
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if(_priv->tx_b0 != NULL)
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kfree(_priv->tx_b0);
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if(_priv->tx_b != NULL)
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kfree(_priv->tx_b);
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if(_priv->tx_e != NULL)
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kfree(_priv->tx_e);
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if(_priv->tx_s0 != NULL)
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kfree(_priv->tx_s0);
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if(_priv->rx_b0 != NULL)
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kfree(_priv->rx_b0);
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if(_priv->rx_b != NULL)
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kfree(_priv->rx_b);
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if(_priv->rx_a != NULL)
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kfree(_priv->rx_a);
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#endif
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kfree(priv);
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}
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static inline void xor_block(u8 * b, u8 * a, size_t len)
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{
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int i;
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for (i = 0; i < len; i++)
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b[i] ^= a[i];
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}
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static void ccmp_init_blocks(struct crypto_cipher *tfm,
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struct ieee80211_hdr *hdr,
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u8 * pn, size_t dlen, u8 * b0, u8 * auth, u8 * s0)
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{
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u8 *pos, qc = 0;
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size_t aad_len;
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int a4_included, qc_included;
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u8 aad[2 * AES_BLOCK_LEN];
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a4_included = ieee80211_has_a4(hdr->frame_control);
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qc_included = ieee80211_is_data_qos(hdr->frame_control);
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aad_len = 22;
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if (a4_included)
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aad_len += 6;
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if (qc_included) {
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pos = (u8 *) & hdr->addr4;
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if (a4_included)
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pos += 6;
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qc = *pos & 0x0f;
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aad_len += 2;
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}
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b0[0] = 0x59;
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b0[1] = qc;
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memcpy(b0 + 2, hdr->addr2, ETH_ALEN);
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memcpy(b0 + 8, pn, CCMP_PN_LEN);
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b0[14] = (dlen >> 8) & 0xff;
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b0[15] = dlen & 0xff;
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pos = (u8 *) hdr;
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aad[0] = 0;
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aad[1] = aad_len & 0xff;
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aad[2] = pos[0] & 0x8f;
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aad[3] = pos[1] & 0xc7;
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memcpy(aad + 4, hdr->addr1, 3 * ETH_ALEN);
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pos = (u8 *) & hdr->seq_ctrl;
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aad[22] = pos[0] & 0x0f;
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aad[23] = 0;
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memset(aad + 24, 0, 8);
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if (a4_included)
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memcpy(aad + 24, hdr->addr4, ETH_ALEN);
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if (qc_included) {
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aad[a4_included ? 30 : 24] = qc;
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}
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lib80211_ccmp_aes_encrypt(tfm, b0, auth);
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xor_block(auth, aad, AES_BLOCK_LEN);
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lib80211_ccmp_aes_encrypt(tfm, auth, auth);
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xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN);
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lib80211_ccmp_aes_encrypt(tfm, auth, auth);
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b0[0] &= 0x07;
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b0[14] = b0[15] = 0;
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lib80211_ccmp_aes_encrypt(tfm, b0, s0);
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}
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static int lib80211_ccmp_hdr(struct sk_buff *skb, int hdr_len,
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u8 *aeskey, int keylen, void *priv)
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{
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struct lib80211_ccmp_data *key = priv;
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int i;
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u8 *pos;
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if (skb_headroom(skb) < CCMP_HDR_LEN || skb->len < hdr_len)
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return -1;
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if (aeskey != NULL && keylen >= CCMP_TK_LEN)
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memcpy(aeskey, key->key, CCMP_TK_LEN);
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pos = skb_push(skb, CCMP_HDR_LEN);
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memmove(pos, pos + CCMP_HDR_LEN, hdr_len);
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pos += hdr_len;
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i = CCMP_PN_LEN - 1;
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while (i >= 0) {
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key->tx_pn[i]++;
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if (key->tx_pn[i] != 0)
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break;
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i--;
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}
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*pos++ = key->tx_pn[5];
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*pos++ = key->tx_pn[4];
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*pos++ = 0;
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*pos++ = (key->key_idx << 6) | (1 << 5) ;
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*pos++ = key->tx_pn[3];
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*pos++ = key->tx_pn[2];
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*pos++ = key->tx_pn[1];
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*pos++ = key->tx_pn[0];
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return CCMP_HDR_LEN;
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}
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static int lib80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
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{
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struct lib80211_ccmp_data *key = priv;
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int data_len, i, blocks, last, len;
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u8 *pos, *mic;
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struct ieee80211_hdr *hdr;
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#ifndef MULTI_THREAD_ENCRYPT
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u8 *b0 = key->tx_b0;
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u8 *b = key->tx_b;
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u8 *e = key->tx_e;
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u8 *s0 = key->tx_s0;
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int ret;
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#else
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unsigned int offset = smp_processor_id()*AES_BLOCK_LEN*sizeof(u8);
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u8 *b0 = (key->tx_b0 + offset);
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u8 *b = (key->tx_b + offset);
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u8 *e = (key->tx_e + offset);
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u8 *s0 = (key->tx_s0 + offset);
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u8 tmp_tx_pn[CCMP_PN_LEN], *ccmp_hdr_ptr = NULL;
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void *mask_ptr = NULL;
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#endif
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#ifndef MULTI_THREAD_ENCRYPT
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ret = skb_padto(skb, skb->len + CCMP_MIC_LEN);
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if (ret)
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{
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printk(KERN_ERR "Failed to extand skb for CCMP encryption.");
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return -1;
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}
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if (skb->len < hdr_len)
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return -1;
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#endif
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#ifndef MULTI_THREAD_ENCRYPT
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data_len = skb->len - hdr_len;
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len = lib80211_ccmp_hdr(skb, hdr_len, NULL, 0, priv);
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if (len < 0)
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return -1;
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#else
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mask_ptr = (void *)((size_t)skb_end_pointer(skb) - sizeof(prepare_mask));
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if(memcmp(mask_ptr, &prepare_mask, sizeof(prepare_mask)) != 0)
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{
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printk("no prepared skb\n");
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return -1;
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}
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data_len = skb->len - (hdr_len + CCMP_HDR_LEN);
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ccmp_hdr_ptr = (u8 *)(skb->data + hdr_len);
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tmp_tx_pn[5] = ccmp_hdr_ptr[0];
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tmp_tx_pn[4] = ccmp_hdr_ptr[1];
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tmp_tx_pn[3] = ccmp_hdr_ptr[4];
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tmp_tx_pn[2] = ccmp_hdr_ptr[5];
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tmp_tx_pn[1] = ccmp_hdr_ptr[6];
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tmp_tx_pn[0] = ccmp_hdr_ptr[7];
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#endif
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pos = skb->data + hdr_len + CCMP_HDR_LEN;
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hdr = (struct ieee80211_hdr *)skb->data;
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#ifndef MULTI_THREAD_ENCRYPT
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ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0);
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#else
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ccmp_init_blocks(key->tfm, hdr, tmp_tx_pn, data_len, b0, b, s0);
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#endif
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blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
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last = data_len % AES_BLOCK_LEN;
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for (i = 1; i <= blocks; i++) {
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len = (i == blocks && last) ? last : AES_BLOCK_LEN;
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xor_block(b, pos, len);
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lib80211_ccmp_aes_encrypt(key->tfm, b, b);
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b0[14] = (i >> 8) & 0xff;
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b0[15] = i & 0xff;
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lib80211_ccmp_aes_encrypt(key->tfm, b0, e);
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xor_block(pos, e, len);
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pos += len;
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}
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mic = skb_put(skb, CCMP_MIC_LEN);
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for (i = 0; i < CCMP_MIC_LEN; i++)
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mic[i] = b[i] ^ s0[i];
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return 0;
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}
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static inline int ccmp_replay_check(u8 *pn_n, u8 *pn_o)
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{
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u32 iv32_n, iv16_n;
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u32 iv32_o, iv16_o;
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iv32_n = (pn_n[0] << 24) | (pn_n[1] << 16) | (pn_n[2] << 8) | pn_n[3];
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iv16_n = (pn_n[4] << 8) | pn_n[5];
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iv32_o = (pn_o[0] << 24) | (pn_o[1] << 16) | (pn_o[2] << 8) | pn_o[3];
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iv16_o = (pn_o[4] << 8) | pn_o[5];
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if ((s32)iv32_n - (s32)iv32_o < 0 ||
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(iv32_n == iv32_o && iv16_n <= iv16_o))
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return 1;
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return 0;
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}
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static int lib80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
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{
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struct lib80211_ccmp_data *key = priv;
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u8 keyidx, *pos;
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struct ieee80211_hdr *hdr;
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#ifndef MULTI_THREAD_ENCRYPT
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u8 *b0 = key->rx_b0;
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u8 *b = key->rx_b;
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u8 *a = key->rx_a;
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#else
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unsigned int offset = smp_processor_id()*AES_BLOCK_LEN*sizeof(u8);
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u8 *b0 = (key->rx_b0 + offset);
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u8 *b = (key->rx_b + offset);
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u8 *a = (key->rx_a + offset);
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#endif
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u8 pn[6];
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int i, blocks, last, len;
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size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN - CCMP_MIC_LEN;
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u8 *mic = skb->data + skb->len - CCMP_MIC_LEN;
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#ifndef MULTI_THREAD_ENCRYPT
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if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) {
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key->dot11RSNAStatsCCMPFormatErrors++;
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return -1;
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}
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#endif
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hdr = (struct ieee80211_hdr *)skb->data;
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pos = skb->data + hdr_len;
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keyidx = pos[3];
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#ifndef MULTI_THREAD_ENCRYPT
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if (!(keyidx & (1 << 5))) {
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if (net_ratelimit()) {
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printk(KERN_DEBUG "CCMP: received packet without ExtIV"
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" flag from %pM (%02X)\n", hdr->addr2, keyidx);
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}
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key->dot11RSNAStatsCCMPFormatErrors++;
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return -2;
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}
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keyidx >>= 6;
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if (key->key_idx != keyidx) {
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printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame "
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"keyidx=%d priv=%p\n", key->key_idx, keyidx, priv);
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return -6;
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}
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if (!key->key_set) {
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if (net_ratelimit()) {
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printk(KERN_DEBUG "CCMP: received packet from %pM"
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" with keyid=%d that does not have a configured"
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" key\n", hdr->addr2, keyidx);
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}
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return -3;
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}
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#endif
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pn[0] = pos[7];
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pn[1] = pos[6];
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pn[2] = pos[5];
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pn[3] = pos[4];
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pn[4] = pos[1];
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pn[5] = pos[0];
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pos += 8;
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#if 0
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if (ccmp_replay_check(pn, key->rx_pn)) {
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#ifdef CONFIG_LIB80211_DEBUG
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if (net_ratelimit())
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{
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printk(KERN_DEBUG "CCMP: replay detected: STA=%pM "
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"previous PN %02x%02x%02x%02x%02x%02x "
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"received PN %02x%02x%02x%02x%02x%02x\n",
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hdr->addr2,
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key->rx_pn[0], key->rx_pn[1], key->rx_pn[2],
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key->rx_pn[3], key->rx_pn[4], key->rx_pn[5],
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pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
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}
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#endif
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key->dot11RSNAStatsCCMPReplays++;
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return -4;
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}
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#endif
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ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b);
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xor_block(mic, b, CCMP_MIC_LEN);
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blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
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last = data_len % AES_BLOCK_LEN;
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for (i = 1; i <= blocks; i++) {
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len = (i == blocks && last) ? last : AES_BLOCK_LEN;
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b0[14] = (i >> 8) & 0xff;
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b0[15] = i & 0xff;
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lib80211_ccmp_aes_encrypt(key->tfm, b0, b);
|
xor_block(pos, b, len);
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xor_block(a, pos, len);
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lib80211_ccmp_aes_encrypt(key->tfm, a, a);
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pos += len;
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}
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if (memcmp(mic, a, CCMP_MIC_LEN) != 0) {
|
if (net_ratelimit()) {
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printk(KERN_DEBUG "CCMP: decrypt failed: STA="
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"%pM\n", hdr->addr2);
|
}
|
key->dot11RSNAStatsCCMPDecryptErrors++;
|
return -5;
|
}
|
#ifndef MULTI_THREAD_ENCRYPT
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memcpy(key->rx_pn, pn, CCMP_PN_LEN);
|
#else
|
if (!ccmp_replay_check(pn, key->rx_pn))
|
memcpy(key->rx_pn, pn, CCMP_PN_LEN);
|
#endif
|
memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len);
|
skb_pull(skb, CCMP_HDR_LEN);
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skb_trim(skb, skb->len - CCMP_MIC_LEN);
|
return keyidx;
|
}
|
static int lib80211_ccmp_set_key(void *key, int len, u8 * seq, void *priv)
|
{
|
struct lib80211_ccmp_data *data = priv;
|
int keyidx;
|
struct crypto_cipher *tfm = data->tfm;
|
#ifdef MULTI_THREAD_ENCRYPT
|
u8 *tx_b0 = data->tx_b0;
|
u8 *tx_b = data->tx_b;
|
u8 *tx_e = data->tx_e;
|
u8 *tx_s0 = data->tx_s0;
|
u8 *rx_b0 = data->rx_b0;
|
u8 *rx_b = data->rx_b;
|
u8 *rx_a = data->rx_a;
|
#endif
|
keyidx = data->key_idx;
|
memset(data, 0, sizeof(*data));
|
data->key_idx = keyidx;
|
data->tfm = tfm;
|
if (len == CCMP_TK_LEN) {
|
memcpy(data->key, key, CCMP_TK_LEN);
|
data->key_set = 1;
|
if (seq) {
|
data->rx_pn[0] = seq[5];
|
data->rx_pn[1] = seq[4];
|
data->rx_pn[2] = seq[3];
|
data->rx_pn[3] = seq[2];
|
data->rx_pn[4] = seq[1];
|
data->rx_pn[5] = seq[0];
|
#ifdef MULTI_THREAD_ENCRYPT
|
memcpy(data->pre_rx_pn, data->rx_pn, CCMP_PN_LEN);
|
#endif
|
}
|
crypto_cipher_setkey(data->tfm, data->key, CCMP_TK_LEN);
|
#ifdef MULTI_THREAD_ENCRYPT
|
data->tx_b0 = tx_b0;
|
data->tx_b = tx_b;
|
data->tx_e = tx_e;
|
data->tx_s0 = tx_s0;
|
data->rx_b0 = rx_b0;
|
data->rx_b = rx_b;
|
data->rx_a = rx_a;
|
#endif
|
} else if (len == 0)
|
data->key_set = 0;
|
else
|
return -1;
|
return 0;
|
}
|
static int lib80211_ccmp_get_key(void *key, int len, u8 * seq, void *priv)
|
{
|
struct lib80211_ccmp_data *data = priv;
|
if (len < CCMP_TK_LEN)
|
return -1;
|
if (!data->key_set)
|
return 0;
|
memcpy(key, data->key, CCMP_TK_LEN);
|
if (seq) {
|
seq[0] = data->tx_pn[5];
|
seq[1] = data->tx_pn[4];
|
seq[2] = data->tx_pn[3];
|
seq[3] = data->tx_pn[2];
|
seq[4] = data->tx_pn[1];
|
seq[5] = data->tx_pn[0];
|
}
|
return CCMP_TK_LEN;
|
}
|
static int lib80211_ccmp_set_tx_pn(u8 * seq, void *priv)
|
{
|
struct lib80211_ccmp_data *data = priv;
|
if (seq) {
|
data->tx_pn[0] = seq[0];
|
data->tx_pn[1] = seq[1];
|
data->tx_pn[2] = seq[2];
|
data->tx_pn[3] = seq[3];
|
data->tx_pn[4] = seq[4];
|
data->tx_pn[5] = seq[5];
|
}
|
return 0;
|
}
|
static char *lib80211_ccmp_print_stats(char *p, void *priv)
|
{
|
struct lib80211_ccmp_data *ccmp = priv;
|
p += sprintf(p, "key[%d] alg=CCMP key_set=%d "
|
"tx_pn=%02x%02x%02x%02x%02x%02x "
|
"rx_pn=%02x%02x%02x%02x%02x%02x "
|
"format_errors=%d replays=%d decrypt_errors=%d\n",
|
ccmp->key_idx, ccmp->key_set,
|
ccmp->tx_pn[0], ccmp->tx_pn[1], ccmp->tx_pn[2],
|
ccmp->tx_pn[3], ccmp->tx_pn[4], ccmp->tx_pn[5],
|
ccmp->rx_pn[0], ccmp->rx_pn[1], ccmp->rx_pn[2],
|
ccmp->rx_pn[3], ccmp->rx_pn[4], ccmp->rx_pn[5],
|
ccmp->dot11RSNAStatsCCMPFormatErrors,
|
ccmp->dot11RSNAStatsCCMPReplays,
|
ccmp->dot11RSNAStatsCCMPDecryptErrors);
|
return p;
|
}
|
#ifdef MULTI_THREAD_ENCRYPT
|
static int lib80211_ccmp_encrypt_prepare (struct sk_buff * skb, int hdr_len, void *priv)
|
{
|
int data_len, len, ret;
|
void *ptr = NULL;
|
if (skb_tailroom(skb) < CCMP_MIC_LEN)
|
{
|
ret = skb_padto(skb, skb->len + CCMP_MIC_LEN);
|
if (ret != 0)
|
{
|
printk(KERN_ERR "Failed to extand skb for CCMP encryption, ret = %d.", ret);
|
return -1;
|
}
|
}
|
if (skb->len < hdr_len)
|
return -1;
|
data_len = skb->len - hdr_len;
|
len = lib80211_ccmp_hdr(skb, hdr_len, NULL, 0, priv);
|
if (len < 0)
|
return -1;
|
ptr = (void *)((size_t)skb_end_pointer(skb) - sizeof(prepare_mask));
|
memcpy(ptr, &prepare_mask, sizeof(prepare_mask));
|
return 0;
|
}
|
static int lib80211_ccmp_decrypt_prepare (struct sk_buff * skb, int hdr_len, void *priv)
|
{
|
struct lib80211_ccmp_data *key = priv;
|
u8 keyidx, *pos;
|
struct ieee80211_hdr *hdr;
|
u8 pn[6];
|
if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN)
|
{
|
key->dot11RSNAStatsCCMPFormatErrors++;
|
return -1;
|
}
|
hdr = (struct ieee80211_hdr *)skb->data;
|
pos = skb->data + hdr_len;
|
keyidx = pos[3];
|
if (!(keyidx & (1 << 5)))
|
{
|
{
|
printk(KERN_DEBUG "CCMP: received packet without ExtIV"
|
" flag from %pM (%02X)\n", hdr->addr2, keyidx);
|
}
|
key->dot11RSNAStatsCCMPFormatErrors++;
|
return -2;
|
}
|
keyidx >>= 6;
|
if (key->key_idx != keyidx)
|
{
|
printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame "
|
"keyidx=%d priv=%p\n", key->key_idx, keyidx, priv);
|
return -6;
|
}
|
if (!key->key_set)
|
{
|
{
|
printk(KERN_DEBUG "CCMP: received packet from %pM"
|
" with keyid=%d that does not have a configured"
|
" key\n", hdr->addr2, keyidx);
|
}
|
return -3;
|
}
|
pn[0] = pos[7];
|
pn[1] = pos[6];
|
pn[2] = pos[5];
|
pn[3] = pos[4];
|
pn[4] = pos[1];
|
pn[5] = pos[0];
|
#if 0
|
if (ccmp_replay_check(pn, key->pre_rx_pn))
|
{
|
#if 1
|
{
|
printk(KERN_DEBUG "CCMP: replay detected: STA=%pM "
|
"previous PN %02x%02x%02x%02x%02x%02x "
|
"received PN %02x%02x%02x%02x%02x%02x\n",
|
hdr->addr2,
|
key->rx_pn[0], key->rx_pn[1], key->rx_pn[2],
|
key->rx_pn[3], key->rx_pn[4], key->rx_pn[5],
|
pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
|
}
|
#endif
|
key->dot11RSNAStatsCCMPReplays++;
|
return -4;
|
}
|
#endif
|
memcpy(key->pre_rx_pn, pn, CCMP_PN_LEN);
|
return 0;
|
}
|
#endif
|
static struct ssv_crypto_ops ssv_crypt_ccmp = {
|
.name = "CCMP",
|
.init = lib80211_ccmp_init,
|
.deinit = lib80211_ccmp_deinit,
|
.encrypt_mpdu = lib80211_ccmp_encrypt,
|
.decrypt_mpdu = lib80211_ccmp_decrypt,
|
.encrypt_msdu = NULL,
|
.decrypt_msdu = NULL,
|
.set_tx_pn = lib80211_ccmp_set_tx_pn,
|
.set_key = lib80211_ccmp_set_key,
|
.get_key = lib80211_ccmp_get_key,
|
.print_stats = lib80211_ccmp_print_stats,
|
.extra_mpdu_prefix_len = CCMP_HDR_LEN,
|
.extra_mpdu_postfix_len = CCMP_MIC_LEN,
|
#ifdef MULTI_THREAD_ENCRYPT
|
.encrypt_prepare = lib80211_ccmp_encrypt_prepare,
|
.decrypt_prepare = lib80211_ccmp_decrypt_prepare,
|
#endif
|
};
|
struct ssv_crypto_ops *get_crypto_ccmp_ops(void)
|
{
|
return &ssv_crypt_ccmp;
|
}
|
#if 0
|
static inline int ccmp_replay_check(u8 *pn_n, u8 *pn_o)
|
{
|
u32 iv32_n, iv16_n;
|
u32 iv32_o, iv16_o;
|
iv32_n = (pn_n[5] << 24) | (pn_n[4] << 16) | (pn_n[3] << 8) | pn_n[2];
|
iv16_n = (pn_n[1] << 8) | pn_n[0];
|
iv32_o = (pn_o[5] << 24) | (pn_o[4] << 16) | (pn_o[3] << 8) | pn_o[2];
|
iv16_o = (pn_o[1] << 8) | pn_o[0];
|
if (((u32)iv32_n < (u32)iv32_o) ||
|
(iv32_n == iv32_o && iv16_n <= iv16_o))
|
return 1;
|
return 0;
|
}
|
static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch, int encrypted)
|
{
|
u16 mask_fc;
|
u8 a4_included=0, mgmt=0;
|
u8 qos_tid;
|
u8 *b_0, *aad;
|
u16 data_len, len_a;
|
unsigned int hdrlen;
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
mask_fc = hdr->frame_control;
|
b_0 = scratch + 3 * AES_BLOCK_LEN;
|
aad = scratch + 4 * AES_BLOCK_LEN;
|
if((mask_fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)
|
mgmt = 1;
|
else
|
mgmt = 0;
|
mask_fc &= ~IEEE80211_FCTL_RETRY;
|
mask_fc &= ~IEEE80211_FCTL_PM;
|
mask_fc &= ~IEEE80211_FCTL_MOREDATA;
|
if (!mgmt)
|
mask_fc &= ~0x0070;
|
hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
len_a = hdrlen - 2;
|
if( (mask_fc & (IEEE80211_FCTL_FROMDS|IEEE80211_FCTL_TODS)) == (IEEE80211_FCTL_FROMDS|IEEE80211_FCTL_TODS))
|
a4_included = 1;
|
else
|
a4_included = 0;
|
if (ieee80211_is_data_qos(hdr->frame_control))
|
qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
|
else
|
qos_tid = 0;
|
#if 0
|
if ((mask_fc & (IEEE80211_FCTL_FTYPE | IEEE80211_STYPE_QOS_DATA)) == (IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_DATA))
|
{
|
if(a4_included)
|
qos_tid = (*((u8 *)ppkt + ppkt->hdr_offset+30)) & IEEE80211_QOS_CTL_TID_MASK;
|
else
|
qos_tid = (*((u8 *)ppkt + ppkt->hdr_offset+24)) & IEEE80211_QOS_CTL_TID_MASK;
|
}
|
else
|
qos_tid = 0;
|
#endif
|
data_len = skb->len - hdrlen;
|
if (encrypted)
|
{
|
data_len -= CCMP_MIC_LEN;
|
data_len -= CCMP_HDR_LEN;
|
}
|
b_0[0] = 0x59;
|
b_0[1] = qos_tid | (mgmt << 4);
|
memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
|
memcpy(&b_0[8], pn, CCMP_PN_LEN);
|
put_unaligned_be16(data_len, &b_0[14]);
|
put_unaligned_be16(len_a, &aad[0]);
|
put_unaligned(mask_fc, (__le16 *)&aad[2]);
|
memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
|
aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
|
aad[23] = 0;
|
if (a4_included) {
|
memcpy(&aad[24], hdr->addr4, ETH_ALEN);
|
aad[30] = qos_tid;
|
aad[31] = 0;
|
} else {
|
memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
|
aad[24] = qos_tid;
|
}
|
}
|
static void ccmp_pn2hdr(u8 *hdr, int key_id, u8 *pn)
|
{
|
#if 0
|
hdr[0] = pn[0];
|
hdr[1] = pn[1];
|
hdr[2] = 0;
|
hdr[3] = 0x20 | (key_id << 6);
|
hdr[4] = pn[2];
|
hdr[5] = pn[3];
|
hdr[6] = pn[4];
|
hdr[7] = pn[5];
|
#endif
|
hdr[0] = pn[5];
|
hdr[1] = pn[4];
|
hdr[2] = 0;
|
hdr[3] = 0x20 | (key_id << 6);
|
hdr[4] = pn[3];
|
hdr[5] = pn[2];
|
hdr[6] = pn[1];
|
hdr[7] = pn[0];
|
}
|
#if 0
|
static void ccmp_hdr2pn(u8 *hdr, u8 *pn)
|
{
|
pn[0] = hdr[0];
|
pn[1] = hdr[1];
|
pn[2] = hdr[4];
|
pn[3] = hdr[5];
|
pn[4] = hdr[6];
|
pn[5] = hdr[7];
|
}
|
#endif
|
int ieee80211_crypto_ccmp_encrypt(struct sk_buff *skb, u8 *key, u8 keyidx, u8 *tx_pn)
|
{
|
u8 *data;
|
u32 data_len;
|
u8 crypto_buf[6 * AES_BLOCK_LEN];
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
u32 hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
u64 pn64;
|
u8 pn[6];
|
data_len = skb->len - hdrlen;
|
data = ((u8*)skb->data)+hdrlen;
|
#ifdef SECURITY_DUMP
|
fpga_dump(ppkt,"case-",key,16,0);
|
#endif
|
#if PRINT_DEBUG
|
printk("CCMP encrypt: PN = 0x%02x%02x%02x%02x%02x%02x\n",tx_pn[5],tx_pn[4],tx_pn[3],tx_pn[2],tx_pn[1],tx_pn[0]);
|
#endif
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
|
#if 0
|
frame = (u16*)((u8 *)ppkt + ppkt->hdr_offset);
|
*frame |= IEEE80211_FCTL_PROTECTED;
|
#endif
|
pn64 = (*(u64*)tx_pn)++;
|
pn[5] = pn64;
|
pn[4] = pn64 >> 8;
|
pn[3] = pn64 >> 16;
|
pn[2] = pn64 >> 24;
|
pn[1] = pn64 >> 32;
|
pn[0] = pn64 >> 40;
|
ccmp_special_blocks(skb, pn, crypto_buf, 0);
|
data = skb_push(skb, CCMP_HDR_LEN);
|
memmove(data, data + CCMP_HDR_LEN, hdrlen);
|
ccmp_pn2hdr(data+hdrlen, keyidx, pn);
|
ieee80211_aes_ccm_encrypt(crypto_buf ,key , data+CCMP_HDR_LEN+hdrlen , data_len, skb_put(skb, CCMP_MIC_LEN));
|
#ifdef SECURITY_DUMP
|
fpga_dump(ppkt,"case-",key,16,1);
|
#endif
|
return true;
|
}
|
#endif
|
