mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-27 01:38:37 -05:00
0f3d578efc
Remove the GPL notification text from the files that were initially contributed by myself. Signed-hostap: Jouni Malinen <j@w1.fi>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
|
|
* AES-128 CBC
|
|
*
|
|
* 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_cbc_encrypt - AES-128 CBC encryption
|
|
* @key: Encryption key
|
|
* @iv: Encryption IV for CBC mode (16 bytes)
|
|
* @data: Data to encrypt in-place
|
|
* @data_len: Length of data in bytes (must be divisible by 16)
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
|
|
{
|
|
void *ctx;
|
|
u8 cbc[AES_BLOCK_SIZE];
|
|
u8 *pos = data;
|
|
int i, j, blocks;
|
|
|
|
ctx = aes_encrypt_init(key, 16);
|
|
if (ctx == NULL)
|
|
return -1;
|
|
os_memcpy(cbc, iv, AES_BLOCK_SIZE);
|
|
|
|
blocks = data_len / AES_BLOCK_SIZE;
|
|
for (i = 0; i < blocks; i++) {
|
|
for (j = 0; j < AES_BLOCK_SIZE; j++)
|
|
cbc[j] ^= pos[j];
|
|
aes_encrypt(ctx, cbc, cbc);
|
|
os_memcpy(pos, cbc, AES_BLOCK_SIZE);
|
|
pos += AES_BLOCK_SIZE;
|
|
}
|
|
aes_encrypt_deinit(ctx);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* aes_128_cbc_decrypt - AES-128 CBC decryption
|
|
* @key: Decryption key
|
|
* @iv: Decryption IV for CBC mode (16 bytes)
|
|
* @data: Data to decrypt in-place
|
|
* @data_len: Length of data in bytes (must be divisible by 16)
|
|
* Returns: 0 on success, -1 on failure
|
|
*/
|
|
int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
|
|
{
|
|
void *ctx;
|
|
u8 cbc[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE];
|
|
u8 *pos = data;
|
|
int i, j, blocks;
|
|
|
|
ctx = aes_decrypt_init(key, 16);
|
|
if (ctx == NULL)
|
|
return -1;
|
|
os_memcpy(cbc, iv, AES_BLOCK_SIZE);
|
|
|
|
blocks = data_len / AES_BLOCK_SIZE;
|
|
for (i = 0; i < blocks; i++) {
|
|
os_memcpy(tmp, pos, AES_BLOCK_SIZE);
|
|
aes_decrypt(ctx, pos, pos);
|
|
for (j = 0; j < AES_BLOCK_SIZE; j++)
|
|
pos[j] ^= cbc[j];
|
|
os_memcpy(cbc, tmp, AES_BLOCK_SIZE);
|
|
pos += AES_BLOCK_SIZE;
|
|
}
|
|
aes_decrypt_deinit(ctx);
|
|
return 0;
|
|
}
|