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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * sm3_base.h - core logic for SM3 implementations
4 *
5 * Copyright (C) 2017 ARM Limited or its affiliates.
6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
7 */
8
9#ifndef _CRYPTO_SM3_BASE_H
10#define _CRYPTO_SM3_BASE_H
11
12#include <crypto/internal/hash.h>
13#include <crypto/sm3.h>
14#include <linux/crypto.h>
15#include <linux/module.h>
16#include <asm/unaligned.h>
17
18typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
19
20static inline int sm3_base_init(struct shash_desc *desc)
21{
22 struct sm3_state *sctx = shash_desc_ctx(desc);
23
24 sctx->state[0] = SM3_IVA;
25 sctx->state[1] = SM3_IVB;
26 sctx->state[2] = SM3_IVC;
27 sctx->state[3] = SM3_IVD;
28 sctx->state[4] = SM3_IVE;
29 sctx->state[5] = SM3_IVF;
30 sctx->state[6] = SM3_IVG;
31 sctx->state[7] = SM3_IVH;
32 sctx->count = 0;
33
34 return 0;
35}
36
37static inline int sm3_base_do_update(struct shash_desc *desc,
38 const u8 *data,
39 unsigned int len,
40 sm3_block_fn *block_fn)
41{
42 struct sm3_state *sctx = shash_desc_ctx(desc);
43 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
44
45 sctx->count += len;
46
47 if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
48 int blocks;
49
50 if (partial) {
51 int p = SM3_BLOCK_SIZE - partial;
52
53 memcpy(sctx->buffer + partial, data, p);
54 data += p;
55 len -= p;
56
57 block_fn(sctx, sctx->buffer, 1);
58 }
59
60 blocks = len / SM3_BLOCK_SIZE;
61 len %= SM3_BLOCK_SIZE;
62
63 if (blocks) {
64 block_fn(sctx, data, blocks);
65 data += blocks * SM3_BLOCK_SIZE;
66 }
67 partial = 0;
68 }
69 if (len)
70 memcpy(sctx->buffer + partial, data, len);
71
72 return 0;
73}
74
75static inline int sm3_base_do_finalize(struct shash_desc *desc,
76 sm3_block_fn *block_fn)
77{
78 const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
79 struct sm3_state *sctx = shash_desc_ctx(desc);
80 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
81 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
82
83 sctx->buffer[partial++] = 0x80;
84 if (partial > bit_offset) {
85 memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
86 partial = 0;
87
88 block_fn(sctx, sctx->buffer, 1);
89 }
90
91 memset(sctx->buffer + partial, 0x0, bit_offset - partial);
92 *bits = cpu_to_be64(sctx->count << 3);
93 block_fn(sctx, sctx->buffer, 1);
94
95 return 0;
96}
97
98static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
99{
100 struct sm3_state *sctx = shash_desc_ctx(desc);
101 __be32 *digest = (__be32 *)out;
102 int i;
103
104 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
105 put_unaligned_be32(sctx->state[i], digest++);
106
107 *sctx = (struct sm3_state){};
108 return 0;
109}
110
111#endif /* _CRYPTO_SM3_BASE_H */
1/*
2 * sm3_base.h - core logic for SM3 implementations
3 *
4 * Copyright (C) 2017 ARM Limited or its affiliates.
5 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <crypto/internal/hash.h>
21#include <crypto/sm3.h>
22#include <linux/crypto.h>
23#include <linux/module.h>
24#include <asm/unaligned.h>
25
26typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
27
28static inline int sm3_base_init(struct shash_desc *desc)
29{
30 struct sm3_state *sctx = shash_desc_ctx(desc);
31
32 sctx->state[0] = SM3_IVA;
33 sctx->state[1] = SM3_IVB;
34 sctx->state[2] = SM3_IVC;
35 sctx->state[3] = SM3_IVD;
36 sctx->state[4] = SM3_IVE;
37 sctx->state[5] = SM3_IVF;
38 sctx->state[6] = SM3_IVG;
39 sctx->state[7] = SM3_IVH;
40 sctx->count = 0;
41
42 return 0;
43}
44
45static inline int sm3_base_do_update(struct shash_desc *desc,
46 const u8 *data,
47 unsigned int len,
48 sm3_block_fn *block_fn)
49{
50 struct sm3_state *sctx = shash_desc_ctx(desc);
51 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
52
53 sctx->count += len;
54
55 if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
56 int blocks;
57
58 if (partial) {
59 int p = SM3_BLOCK_SIZE - partial;
60
61 memcpy(sctx->buffer + partial, data, p);
62 data += p;
63 len -= p;
64
65 block_fn(sctx, sctx->buffer, 1);
66 }
67
68 blocks = len / SM3_BLOCK_SIZE;
69 len %= SM3_BLOCK_SIZE;
70
71 if (blocks) {
72 block_fn(sctx, data, blocks);
73 data += blocks * SM3_BLOCK_SIZE;
74 }
75 partial = 0;
76 }
77 if (len)
78 memcpy(sctx->buffer + partial, data, len);
79
80 return 0;
81}
82
83static inline int sm3_base_do_finalize(struct shash_desc *desc,
84 sm3_block_fn *block_fn)
85{
86 const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
87 struct sm3_state *sctx = shash_desc_ctx(desc);
88 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
89 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
90
91 sctx->buffer[partial++] = 0x80;
92 if (partial > bit_offset) {
93 memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
94 partial = 0;
95
96 block_fn(sctx, sctx->buffer, 1);
97 }
98
99 memset(sctx->buffer + partial, 0x0, bit_offset - partial);
100 *bits = cpu_to_be64(sctx->count << 3);
101 block_fn(sctx, sctx->buffer, 1);
102
103 return 0;
104}
105
106static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
107{
108 struct sm3_state *sctx = shash_desc_ctx(desc);
109 __be32 *digest = (__be32 *)out;
110 int i;
111
112 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
113 put_unaligned_be32(sctx->state[i], digest++);
114
115 *sctx = (struct sm3_state){};
116 return 0;
117}