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caab277b | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
4f0fc160 GBY |
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> | |
4f0fc160 GBY |
7 | */ |
8 | ||
68289c63 MY |
9 | #ifndef _CRYPTO_SM3_BASE_H |
10 | #define _CRYPTO_SM3_BASE_H | |
11 | ||
4f0fc160 GBY |
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 | ||
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 | ||
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 | ||
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 | ||
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 | } | |
68289c63 MY |
110 | |
111 | #endif /* _CRYPTO_SM3_BASE_H */ |