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
crypto_aegis_block_xor(union aegis_block * dst,const union aegis_block * src)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
crypto_aegis_block_and(union aegis_block * dst,const union aegis_block * src)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
crypto_aegis_aesenc(union aegis_block * dst,const union aegis_block * src,const union aegis_block * key)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 */
81
