/*
- * AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
+ * AES Key Wrap Algorithm (RFC3394)
*
* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
*
- * 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.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
#include "includes.h"
#include "aes_wrap.h"
/**
- * aes_wrap - Wrap keys with AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
- * @kek: 16-octet Key encryption key (KEK)
+ * aes_wrap - Wrap keys with AES Key Wrap Algorithm (RFC3394)
+ * @kek: Key encryption key (KEK)
+ * @kek_len: Length of KEK in octets
* @n: Length of the plaintext key in 64-bit units; e.g., 2 = 128-bit = 16
* bytes
* @plain: Plaintext key to be wrapped, n * 64 bits
* @cipher: Wrapped key, (n + 1) * 64 bits
* Returns: 0 on success, -1 on failure
*/
-int aes_wrap(const u8 *kek, int n, const u8 *plain, u8 *cipher)
+int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher)
{
- u8 *a, *r, b[16];
+ u8 *a, *r, b[AES_BLOCK_SIZE];
int i, j;
void *ctx;
+ unsigned int t;
a = cipher;
r = cipher + 8;
os_memset(a, 0xa6, 8);
os_memcpy(r, plain, 8 * n);
- ctx = aes_encrypt_init(kek, 16);
+ ctx = aes_encrypt_init(kek, kek_len);
if (ctx == NULL)
return -1;
os_memcpy(b + 8, r, 8);
aes_encrypt(ctx, b, b);
os_memcpy(a, b, 8);
- a[7] ^= n * j + i;
+ t = n * j + i;
+ a[7] ^= t;
+ a[6] ^= t >> 8;
+ a[5] ^= t >> 16;
+ a[4] ^= t >> 24;
os_memcpy(r, b + 8, 8);
r += 8;
}