4 * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
23 * aes_128_ctr_encrypt - AES-128 CTR mode encryption
24 * @key: Key for encryption (16 bytes)
25 * @nonce: Nonce for counter mode (16 bytes)
26 * @data: Data to encrypt in-place
27 * @data_len: Length of data in bytes
28 * Returns: 0 on success, -1 on failure
30 int aes_128_ctr_encrypt(const u8 *key, const u8 *nonce,
31 u8 *data, size_t data_len)
34 size_t j, len, left = data_len;
37 u8 counter[AES_BLOCK_SIZE], buf[AES_BLOCK_SIZE];
39 ctx = aes_encrypt_init(key, 16);
42 os_memcpy(counter, nonce, AES_BLOCK_SIZE);
45 aes_encrypt(ctx, counter, buf);
47 len = (left < AES_BLOCK_SIZE) ? left : AES_BLOCK_SIZE;
48 for (j = 0; j < len; j++)
53 for (i = AES_BLOCK_SIZE - 1; i >= 0; i--) {
59 aes_encrypt_deinit(ctx);