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1 | /* 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 | ||
22 | union aegis_block { | |
23 | __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)]; | |
24 | u32 words32[AEGIS_BLOCK_SIZE / sizeof(u32)]; | |
25 | 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 | ||
31 | static 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 | ||
42 | static 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 | ||
49 | static 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 | ||
56 | static void crypto_aegis_aesenc(union aegis_block *dst, | |
57 | const union aegis_block *src, | |
58 | const union aegis_block *key) | |
59 | { | |
60 | u32 *d = dst->words32; | |
61 | const u8 *s = src->bytes; | |
62 | const u32 *k = key->words32; | |
63 | const u32 *t0 = crypto_ft_tab[0]; | |
64 | const u32 *t1 = crypto_ft_tab[1]; | |
65 | const u32 *t2 = crypto_ft_tab[2]; | |
66 | const u32 *t3 = crypto_ft_tab[3]; | |
67 | u32 d0, d1, d2, d3; | |
68 | ||
69 | d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]] ^ k[0]; | |
70 | d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]] ^ k[1]; | |
71 | d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]] ^ k[2]; | |
72 | d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]] ^ k[3]; | |
73 | ||
74 | d[0] = d0; | |
75 | d[1] = d1; | |
76 | d[2] = d2; | |
77 | d[3] = d3; | |
78 | } | |
79 | ||
80 | #endif /* _CRYPTO_AEGIS_H */ |