1/* SPDX-License-Identifier: Apache-2.0 OR BSD-2-Clause */
2//
3// This file is dual-licensed, meaning that you can use it under your
4// choice of either of the following two licenses:
5//
6// Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
7//
8// Licensed under the Apache License 2.0 (the "License"). You can obtain
9// a copy in the file LICENSE in the source distribution or at
10// https://www.openssl.org/source/license.html
11//
12// or
13//
14// Copyright (c) 2023, Christoph Müllner <christoph.muellner@vrull.eu>
15// Copyright (c) 2023, Jerry Shih <jerry.shih@sifive.com>
16// Copyright 2024 Google LLC
17// All rights reserved.
18//
19// Redistribution and use in source and binary forms, with or without
20// modification, are permitted provided that the following conditions
21// are met:
22// 1. Redistributions of source code must retain the above copyright
23//    notice, this list of conditions and the following disclaimer.
24// 2. Redistributions in binary form must reproduce the above copyright
25//    notice, this list of conditions and the following disclaimer in the
26//    documentation and/or other materials provided with the distribution.
27//
28// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39
40// The generated code of this file depends on the following RISC-V extensions:
41// - RV64I
42// - RISC-V Vector ('V') with VLEN >= 128
43// - RISC-V Vector SM4 Block Cipher extension ('Zvksed')
44// - RISC-V Vector Cryptography Bit-manipulation extension ('Zvkb')
45
46#include <linux/linkage.h>
47
48.text
49.option arch, +zvksed, +zvkb
50
51// void sm4_expandkey_zksed_zvkb(const u8 user_key[16], u32 rkey_enc[32],
52//				 u32 rkey_dec[32]);
53SYM_FUNC_START(sm4_expandkey_zvksed_zvkb)
54	vsetivli	zero, 4, e32, m1, ta, ma
55
56	// Load the user key.
57	vle32.v		v1, (a0)
58	vrev8.v		v1, v1
59
60	// XOR the user key with the family key.
61	la		t0, FAMILY_KEY
62	vle32.v		v2, (t0)
63	vxor.vv		v1, v1, v2
64
65	// Compute the round keys.  Store them in forwards order in rkey_enc
66	// and in reverse order in rkey_dec.
67	addi		a2, a2, 31*4
68	li		t0, -4
69	.set		i, 0
70.rept 8
71	vsm4k.vi	v1, v1, i
72	vse32.v		v1, (a1)	// Store to rkey_enc.
73	vsse32.v	v1, (a2), t0	// Store to rkey_dec.
74.if i < 7
75	addi		a1, a1, 16
76	addi		a2, a2, -16
77.endif
78	.set		i, i + 1
79.endr
80
81	ret
82SYM_FUNC_END(sm4_expandkey_zvksed_zvkb)
83
84// void sm4_crypt_zvksed_zvkb(const u32 rkey[32], const u8 in[16], u8 out[16]);
85SYM_FUNC_START(sm4_crypt_zvksed_zvkb)
86	vsetivli	zero, 4, e32, m1, ta, ma
87
88	// Load the input data.
89	vle32.v		v1, (a1)
90	vrev8.v		v1, v1
91
92	// Do the 32 rounds of SM4, 4 at a time.
93	.set		i, 0
94.rept 8
95	vle32.v		v2, (a0)
96	vsm4r.vs	v1, v2
97.if i < 7
98	addi		a0, a0, 16
99.endif
100	.set		i, i + 1
101.endr
102
103	// Store the output data (in reverse element order).
104	vrev8.v		v1, v1
105	li		t0, -4
106	addi		a2, a2, 12
107	vsse32.v	v1, (a2), t0
108
109	ret
110SYM_FUNC_END(sm4_crypt_zvksed_zvkb)
111
112.section ".rodata"
113.p2align 2
114.type FAMILY_KEY, @object
115FAMILY_KEY:
116	.word 0xA3B1BAC6, 0x56AA3350, 0x677D9197, 0xB27022DC
117.size FAMILY_KEY, . - FAMILY_KEY
118