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Ondrej Mosnacekf606a882018-05-11 14:12:49 +02001/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * AEGIS common definitions
4 *
5 * Copyright (c) 2018 Ondrej Mosnacek <omosnacek@gmail.com>
6 * Copyright (c) 2018 Red Hat, Inc. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 */
13
14#ifndef _CRYPTO_AEGIS_H
15#define _CRYPTO_AEGIS_H
16
17#include <crypto/aes.h>
18#include <linux/types.h>
19
20#define AEGIS_BLOCK_SIZE 16
21
22union aegis_block {
23 __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
Ard Biesheuvel4f1f9522018-10-01 10:36:38 +020024 __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
Ondrej Mosnacekf606a882018-05-11 14:12:49 +020025 u8 bytes[AEGIS_BLOCK_SIZE];
26};
27
28#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
29#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
30
31static const union aegis_block crypto_aegis_const[2] = {
32 { .words64 = {
33 cpu_to_le64(U64_C(0x0d08050302010100)),
34 cpu_to_le64(U64_C(0x6279e99059372215)),
35 } },
36 { .words64 = {
37 cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
38 cpu_to_le64(U64_C(0xdd28b57342311120)),
39 } },
40};
41
42static void crypto_aegis_block_xor(union aegis_block *dst,
43 const union aegis_block *src)
44{
45 dst->words64[0] ^= src->words64[0];
46 dst->words64[1] ^= src->words64[1];
47}
48
49static void crypto_aegis_block_and(union aegis_block *dst,
50 const union aegis_block *src)
51{
52 dst->words64[0] &= src->words64[0];
53 dst->words64[1] &= src->words64[1];
54}
55
56static void crypto_aegis_aesenc(union aegis_block *dst,
57 const union aegis_block *src,
58 const union aegis_block *key)
59{
Ondrej Mosnacekf606a882018-05-11 14:12:49 +020060 const u8 *s = src->bytes;
Ondrej Mosnacekf606a882018-05-11 14:12:49 +020061 const u32 *t0 = crypto_ft_tab[0];
62 const u32 *t1 = crypto_ft_tab[1];
63 const u32 *t2 = crypto_ft_tab[2];
64 const u32 *t3 = crypto_ft_tab[3];
65 u32 d0, d1, d2, d3;
66
Ard Biesheuvel4f1f9522018-10-01 10:36:38 +020067 d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]];
68 d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]];
69 d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]];
70 d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]];
Ondrej Mosnacekf606a882018-05-11 14:12:49 +020071
Ard Biesheuvel4f1f9522018-10-01 10:36:38 +020072 dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
73 dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
74 dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
75 dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
Ondrej Mosnacekf606a882018-05-11 14:12:49 +020076}
77
78#endif /* _CRYPTO_AEGIS_H */