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
5 * Copyright (C) 2017 ARM Limited or its affiliates.
6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
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.
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.
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/>.
21 #include <crypto/internal/hash.h>
22 #include <linux/init.h>
23 #include <linux/module.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>
32 const 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
38 EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
40 static inline u32 p0(u32 x)
42 return x ^ rol32(x, 9) ^ rol32(x, 17);
45 static inline u32 p1(u32 x)
47 return x ^ rol32(x, 15) ^ rol32(x, 23);
50 static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c)
52 return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c));
55 static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g)
57 return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g));
60 static inline u32 t(unsigned int n)
62 return (n < 16) ? SM3_T1 : SM3_T2;
65 static void sm3_expand(u32 *t, u32 *w, u32 *wt)
71 for (i = 0; i <= 15; i++)
72 w[i] = get_unaligned_be32((__u32 *)t + i);
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];
79 for (i = 0; i <= 63; i++)
80 wt[i] = w[i] ^ w[i + 4];
83 static void sm3_compress(u32 *w, u32 *wt, u32 *m)
89 u32 a, b, c, d, e, f, g, h;
101 for (i = 0; i <= 63; i++) {
103 ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i)), 7);
105 ss2 = ss1 ^ rol32(a, 12);
107 tt1 = ff(i, a, b, c) + d + ss2 + *wt;
110 tt2 = gg(i, e, f, g) + h + ss1 + *w;
132 a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
135 static void sm3_transform(struct sm3_state *sst, u8 const *src)
140 sm3_expand((u32 *)src, w, wt);
141 sm3_compress(w, wt, sst->state);
143 memzero_explicit(w, sizeof(w));
144 memzero_explicit(wt, sizeof(wt));
147 static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src,
151 sm3_transform(sst, src);
152 src += SM3_BLOCK_SIZE;
156 int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
159 return sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
161 EXPORT_SYMBOL(crypto_sm3_update);
163 static int sm3_final(struct shash_desc *desc, u8 *out)
165 sm3_base_do_finalize(desc, sm3_generic_block_fn);
166 return sm3_base_finish(desc, out);
169 int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
170 unsigned int len, u8 *hash)
172 sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
173 return sm3_final(desc, hash);
175 EXPORT_SYMBOL(crypto_sm3_finup);
177 static struct shash_alg sm3_alg = {
178 .digestsize = SM3_DIGEST_SIZE,
179 .init = sm3_base_init,
180 .update = crypto_sm3_update,
182 .finup = crypto_sm3_finup,
183 .descsize = sizeof(struct sm3_state),
186 .cra_driver_name = "sm3-generic",
187 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
188 .cra_blocksize = SM3_BLOCK_SIZE,
189 .cra_module = THIS_MODULE,
193 static int __init sm3_generic_mod_init(void)
195 return crypto_register_shash(&sm3_alg);
198 static void __exit sm3_generic_mod_fini(void)
200 crypto_unregister_shash(&sm3_alg);
203 module_init(sm3_generic_mod_init);
204 module_exit(sm3_generic_mod_fini);
206 MODULE_LICENSE("GPL v2");
207 MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
209 MODULE_ALIAS_CRYPTO("sm3");
210 MODULE_ALIAS_CRYPTO("sm3-generic");