mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-12-04 21:28:27 -05:00
0f3d578efc
Remove the GPL notification text from the files that were initially contributed by myself. Signed-hostap: Jouni Malinen <j@w1.fi>
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/*
|
|
* AES-128 CTR
|
|
*
|
|
* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
|
|
*
|
|
* This software may be distributed under the terms of the BSD license.
|
|
* See README for more details.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include "common.h"
|
|
#include "aes.h"
|
|
#include "aes_wrap.h"
|
|
|
|
/**
|
|
* aes_128_ctr_encrypt - AES-128 CTR mode encryption
|
|
* @key: Key for encryption (16 bytes)
|
|
* @nonce: Nonce for counter mode (16 bytes)
|
|
* @data: Data to encrypt in-place
|
|
* @data_len: Length of data in bytes
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int aes_128_ctr_encrypt(const u8 *key, const u8 *nonce,
|
|
u8 *data, size_t data_len)
|
|
{
|
|
void *ctx;
|
|
size_t j, len, left = data_len;
|
|
int i;
|
|
u8 *pos = data;
|
|
u8 counter[AES_BLOCK_SIZE], buf[AES_BLOCK_SIZE];
|
|
|
|
ctx = aes_encrypt_init(key, 16);
|
|
if (ctx == NULL)
|
|
return -1;
|
|
os_memcpy(counter, nonce, AES_BLOCK_SIZE);
|
|
|
|
while (left > 0) {
|
|
aes_encrypt(ctx, counter, buf);
|
|
|
|
len = (left < AES_BLOCK_SIZE) ? left : AES_BLOCK_SIZE;
|
|
for (j = 0; j < len; j++)
|
|
pos[j] ^= buf[j];
|
|
pos += len;
|
|
left -= len;
|
|
|
|
for (i = AES_BLOCK_SIZE - 1; i >= 0; i--) {
|
|
counter[i]++;
|
|
if (counter[i])
|
|
break;
|
|
}
|
|
}
|
|
aes_encrypt_deinit(ctx);
|
|
return 0;
|
|
}
|