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
18union 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
24struct aegis_state;
25
26extern int aegis128_have_aes_insn;
27
28#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
29#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
30
31bool crypto_aegis128_have_simd(void);
32void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
33void crypto_aegis128_init_simd(struct aegis_state *state,
34			       const union aegis_block *key,
35			       const u8 *iv);
36void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
37					const u8 *src, unsigned int size);
38void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
39					const u8 *src, unsigned int size);
40int crypto_aegis128_final_simd(struct aegis_state *state,
41			       union aegis_block *tag_xor,
42			       unsigned int assoclen,
43			       unsigned int cryptlen,
44			       unsigned int authsize);
45
46static __always_inline void crypto_aegis_block_xor(union aegis_block *dst,
47						   const union aegis_block *src)
48{
49	dst->words64[0] ^= src->words64[0];
50	dst->words64[1] ^= src->words64[1];
51}
52
53static __always_inline void crypto_aegis_block_and(union aegis_block *dst,
54						   const union aegis_block *src)
55{
56	dst->words64[0] &= src->words64[0];
57	dst->words64[1] &= src->words64[1];
58}
59
60static __always_inline void crypto_aegis_aesenc(union aegis_block *dst,
61						const union aegis_block *src,
62						const union aegis_block *key)
63{
64	const u8  *s  = src->bytes;
65	const u32 *t = crypto_ft_tab[0];
66	u32 d0, d1, d2, d3;
67
68	d0 = t[s[ 0]] ^ rol32(t[s[ 5]], 8) ^ rol32(t[s[10]], 16) ^ rol32(t[s[15]], 24);
69	d1 = t[s[ 4]] ^ rol32(t[s[ 9]], 8) ^ rol32(t[s[14]], 16) ^ rol32(t[s[ 3]], 24);
70	d2 = t[s[ 8]] ^ rol32(t[s[13]], 8) ^ rol32(t[s[ 2]], 16) ^ rol32(t[s[ 7]], 24);
71	d3 = t[s[12]] ^ rol32(t[s[ 1]], 8) ^ rol32(t[s[ 6]], 16) ^ rol32(t[s[11]], 24);
72
73	dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
74	dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
75	dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
76	dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
77}
78
79#endif /* _CRYPTO_AEGIS_H */
80