1 /* SPDX-License-Identifier: GPL-2.0-or-later */
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
9 #ifndef _CRYPTO_AEGIS_H
10 #define _CRYPTO_AEGIS_H
11
12 #include <crypto/aes.h>
13 #include <linux/bitops.h>
14 #include <linux/types.h>
15
16 #define AEGIS_BLOCK_SIZE 16
17
18 union aegis_block {
19 __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
20 __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
21 u8 bytes[AEGIS_BLOCK_SIZE];
22 };
23
24 #define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
25 #define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
26
crypto_aegis_block_xor(union aegis_block * dst,const union aegis_block * src)27 static __always_inline void crypto_aegis_block_xor(union aegis_block *dst,
28 const union aegis_block *src)
29 {
30 dst->words64[0] ^= src->words64[0];
31 dst->words64[1] ^= src->words64[1];
32 }
33
crypto_aegis_block_and(union aegis_block * dst,const union aegis_block * src)34 static __always_inline void crypto_aegis_block_and(union aegis_block *dst,
35 const union aegis_block *src)
36 {
37 dst->words64[0] &= src->words64[0];
38 dst->words64[1] &= src->words64[1];
39 }
40
crypto_aegis_aesenc(union aegis_block * dst,const union aegis_block * src,const union aegis_block * key)41 static __always_inline void crypto_aegis_aesenc(union aegis_block *dst,
42 const union aegis_block *src,
43 const union aegis_block *key)
44 {
45 const u8 *s = src->bytes;
46 const u32 *t = crypto_ft_tab[0];
47 u32 d0, d1, d2, d3;
48
49 d0 = t[s[ 0]] ^ rol32(t[s[ 5]], 8) ^ rol32(t[s[10]], 16) ^ rol32(t[s[15]], 24);
50 d1 = t[s[ 4]] ^ rol32(t[s[ 9]], 8) ^ rol32(t[s[14]], 16) ^ rol32(t[s[ 3]], 24);
51 d2 = t[s[ 8]] ^ rol32(t[s[13]], 8) ^ rol32(t[s[ 2]], 16) ^ rol32(t[s[ 7]], 24);
52 d3 = t[s[12]] ^ rol32(t[s[ 1]], 8) ^ rol32(t[s[ 6]], 16) ^ rol32(t[s[11]], 24);
53
54 dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
55 dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
56 dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
57 dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
58 }
59
60 #endif /* _CRYPTO_AEGIS_H */
61
