1/*
2 * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and
3 * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01
4 *
5 * Copyright (C) 2017 ARM Limited or its affiliates.
6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <crypto/internal/hash.h>
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/mm.h>
25#include <linux/types.h>
26#include <crypto/sm3.h>
27#include <crypto/sm3_base.h>
28#include <linux/bitops.h>
29#include <asm/byteorder.h>
30#include <asm/unaligned.h>
31
32const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
33 0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
34 0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
35 0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
36 0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
37};
38EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
39
40static inline u32 p0(u32 x)
41{
42 return x ^ rol32(x, 9) ^ rol32(x, 17);
43}
44
45static inline u32 p1(u32 x)
46{
47 return x ^ rol32(x, 15) ^ rol32(x, 23);
48}
49
50static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c)
51{
52 return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c));
53}
54
55static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g)
56{
57 return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g));
58}
59
60static inline u32 t(unsigned int n)
61{
62 return (n < 16) ? SM3_T1 : SM3_T2;
63}
64
65static void sm3_expand(u32 *t, u32 *w, u32 *wt)
66{
67 int i;
68 unsigned int tmp;
69
70 /* load the input */
71 for (i = 0; i <= 15; i++)
72 w[i] = get_unaligned_be32((__u32 *)t + i);
73
74 for (i = 16; i <= 67; i++) {
75 tmp = w[i - 16] ^ w[i - 9] ^ rol32(w[i - 3], 15);
76 w[i] = p1(tmp) ^ (rol32(w[i - 13], 7)) ^ w[i - 6];
77 }
78
79 for (i = 0; i <= 63; i++)
80 wt[i] = w[i] ^ w[i + 4];
81}
82
83static void sm3_compress(u32 *w, u32 *wt, u32 *m)
84{
85 u32 ss1;
86 u32 ss2;
87 u32 tt1;
88 u32 tt2;
89 u32 a, b, c, d, e, f, g, h;
90 int i;
91
92 a = m[0];
93 b = m[1];
94 c = m[2];
95 d = m[3];
96 e = m[4];
97 f = m[5];
98 g = m[6];
99 h = m[7];
100
101 for (i = 0; i <= 63; i++) {
102
103 ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i & 31)), 7);
104
105 ss2 = ss1 ^ rol32(a, 12);
106
107 tt1 = ff(i, a, b, c) + d + ss2 + *wt;
108 wt++;
109
110 tt2 = gg(i, e, f, g) + h + ss1 + *w;
111 w++;
112
113 d = c;
114 c = rol32(b, 9);
115 b = a;
116 a = tt1;
117 h = g;
118 g = rol32(f, 19);
119 f = e;
120 e = p0(tt2);
121 }
122
123 m[0] = a ^ m[0];
124 m[1] = b ^ m[1];
125 m[2] = c ^ m[2];
126 m[3] = d ^ m[3];
127 m[4] = e ^ m[4];
128 m[5] = f ^ m[5];
129 m[6] = g ^ m[6];
130 m[7] = h ^ m[7];
131
132 a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
133}
134
135static void sm3_transform(struct sm3_state *sst, u8 const *src)
136{
137 unsigned int w[68];
138 unsigned int wt[64];
139
140 sm3_expand((u32 *)src, w, wt);
141 sm3_compress(w, wt, sst->state);
142
143 memzero_explicit(w, sizeof(w));
144 memzero_explicit(wt, sizeof(wt));
145}
146
147static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src,
148 int blocks)
149{
150 while (blocks--) {
151 sm3_transform(sst, src);
152 src += SM3_BLOCK_SIZE;
153 }
154}
155
156int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
157 unsigned int len)
158{
159 return sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
160}
161EXPORT_SYMBOL(crypto_sm3_update);
162
163static int sm3_final(struct shash_desc *desc, u8 *out)
164{
165 sm3_base_do_finalize(desc, sm3_generic_block_fn);
166 return sm3_base_finish(desc, out);
167}
168
169int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
170 unsigned int len, u8 *hash)
171{
172 sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
173 return sm3_final(desc, hash);
174}
175EXPORT_SYMBOL(crypto_sm3_finup);
176
177static struct shash_alg sm3_alg = {
178 .digestsize = SM3_DIGEST_SIZE,
179 .init = sm3_base_init,
180 .update = crypto_sm3_update,
181 .final = sm3_final,
182 .finup = crypto_sm3_finup,
183 .descsize = sizeof(struct sm3_state),
184 .base = {
185 .cra_name = "sm3",
186 .cra_driver_name = "sm3-generic",
187 .cra_blocksize = SM3_BLOCK_SIZE,
188 .cra_module = THIS_MODULE,
189 }
190};
191
192static int __init sm3_generic_mod_init(void)
193{
194 return crypto_register_shash(&sm3_alg);
195}
196
197static void __exit sm3_generic_mod_fini(void)
198{
199 crypto_unregister_shash(&sm3_alg);
200}
201
202module_init(sm3_generic_mod_init);
203module_exit(sm3_generic_mod_fini);
204
205MODULE_LICENSE("GPL v2");
206MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
207
208MODULE_ALIAS_CRYPTO("sm3");
209MODULE_ALIAS_CRYPTO("sm3-generic");
210