1/*	$NetBSD: aes_ct64_enc.c,v 1.1 2025/11/23 22:44:14 riastradh Exp $	*/
2
3/*
4 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
21 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE.
25 */
26
27#include <sys/cdefs.h>
28__KERNEL_RCSID(1, "$NetBSD: aes_ct64_enc.c,v 1.1 2025/11/23 22:44:14 riastradh Exp $");
29
30#include <sys/types.h>
31
32#include <crypto/aes/aes_bear64.h>
33
34static inline void
35add_round_key(uint64_t q[static 8], const uint64_t sk[static 8])
36{
37	q[0] ^= sk[0];
38	q[1] ^= sk[1];
39	q[2] ^= sk[2];
40	q[3] ^= sk[3];
41	q[4] ^= sk[4];
42	q[5] ^= sk[5];
43	q[6] ^= sk[6];
44	q[7] ^= sk[7];
45}
46
47static inline void
48shift_rows(uint64_t q[static 8])
49{
50	int i;
51
52	for (i = 0; i < 8; i ++) {
53		uint64_t x;
54
55		x = q[i];
56		q[i] = (x & (uint64_t)0x000000000000FFFF)
57			| ((x & (uint64_t)0x00000000FFF00000) >> 4)
58			| ((x & (uint64_t)0x00000000000F0000) << 12)
59			| ((x & (uint64_t)0x0000FF0000000000) >> 8)
60			| ((x & (uint64_t)0x000000FF00000000) << 8)
61			| ((x & (uint64_t)0xF000000000000000) >> 12)
62			| ((x & (uint64_t)0x0FFF000000000000) << 4);
63	}
64}
65
66static inline uint64_t
67rotr32(uint64_t x)
68{
69	return (x << 32) | (x >> 32);
70}
71
72static inline void
73mix_columns(uint64_t q[static 8])
74{
75	uint64_t q0, q1, q2, q3, q4, q5, q6, q7;
76	uint64_t r0, r1, r2, r3, r4, r5, r6, r7;
77
78	q0 = q[0];
79	q1 = q[1];
80	q2 = q[2];
81	q3 = q[3];
82	q4 = q[4];
83	q5 = q[5];
84	q6 = q[6];
85	q7 = q[7];
86	r0 = (q0 >> 16) | (q0 << 48);
87	r1 = (q1 >> 16) | (q1 << 48);
88	r2 = (q2 >> 16) | (q2 << 48);
89	r3 = (q3 >> 16) | (q3 << 48);
90	r4 = (q4 >> 16) | (q4 << 48);
91	r5 = (q5 >> 16) | (q5 << 48);
92	r6 = (q6 >> 16) | (q6 << 48);
93	r7 = (q7 >> 16) | (q7 << 48);
94
95	q[0] = q7 ^ r7 ^ r0 ^ rotr32(q0 ^ r0);
96	q[1] = q0 ^ r0 ^ q7 ^ r7 ^ r1 ^ rotr32(q1 ^ r1);
97	q[2] = q1 ^ r1 ^ r2 ^ rotr32(q2 ^ r2);
98	q[3] = q2 ^ r2 ^ q7 ^ r7 ^ r3 ^ rotr32(q3 ^ r3);
99	q[4] = q3 ^ r3 ^ q7 ^ r7 ^ r4 ^ rotr32(q4 ^ r4);
100	q[5] = q4 ^ r4 ^ r5 ^ rotr32(q5 ^ r5);
101	q[6] = q5 ^ r5 ^ r6 ^ rotr32(q6 ^ r6);
102	q[7] = q6 ^ r6 ^ r7 ^ rotr32(q7 ^ r7);
103}
104
105/* see inner.h */
106void
107br_aes_ct64_bitslice_encrypt(unsigned num_rounds,
108	const uint64_t skey[static 120], uint64_t q[static 8])
109{
110	unsigned u;
111
112	add_round_key(q, skey);
113	for (u = 1; u < num_rounds; u ++) {
114		br_aes_ct64_bitslice_Sbox(q);
115		shift_rows(q);
116		mix_columns(q);
117		add_round_key(q, skey + (u << 3));
118	}
119	br_aes_ct64_bitslice_Sbox(q);
120	shift_rows(q);
121	add_round_key(q, skey + (num_rounds << 3));
122}
123