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
18 typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
19
sm3_base_init(struct shash_desc * desc)20 static 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
sm3_base_do_update(struct shash_desc * desc,const u8 * data,unsigned int len,sm3_block_fn * block_fn)37 static 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
sm3_base_do_finalize(struct shash_desc * desc,sm3_block_fn * block_fn)75 static 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
sm3_base_finish(struct shash_desc * desc,u8 * out)98 static 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 */
112
