summaryrefslogtreecommitdiffstats
path: root/contrib/wpa/src/crypto/aes-wrap.c
blob: 28d0c89e88f01cbef1a5befd0b8bc4a843744f30 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
/*
 * AES Key Wrap Algorithm (128-bit KEK) (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.
 */

#include "includes.h"

#include "common.h"
#include "aes.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)
 * @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)
{
	u8 *a, *r, b[16];
	int i, j;
	void *ctx;

	a = cipher;
	r = cipher + 8;

	/* 1) Initialize variables. */
	os_memset(a, 0xa6, 8);
	os_memcpy(r, plain, 8 * n);

	ctx = aes_encrypt_init(kek, 16);
	if (ctx == NULL)
		return -1;

	/* 2) Calculate intermediate values.
	 * For j = 0 to 5
	 *     For i=1 to n
	 *         B = AES(K, A | R[i])
	 *         A = MSB(64, B) ^ t where t = (n*j)+i
	 *         R[i] = LSB(64, B)
	 */
	for (j = 0; j <= 5; j++) {
		r = cipher + 8;
		for (i = 1; i <= n; i++) {
			os_memcpy(b, a, 8);
			os_memcpy(b + 8, r, 8);
			aes_encrypt(ctx, b, b);
			os_memcpy(a, b, 8);
			a[7] ^= n * j + i;
			os_memcpy(r, b + 8, 8);
			r += 8;
		}
	}
	aes_encrypt_deinit(ctx);

	/* 3) Output the results.
	 *
	 * These are already in @cipher due to the location of temporary
	 * variables.
	 */

	return 0;
}
OpenPOWER on IntegriCloud