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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> | |
458c0480 | 16 | #include <linux/string.h> |
4f0fc160 GBY |
17 | #include <asm/unaligned.h> |
18 | ||
19 | typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks); | |
20 | ||
21 | static inline int sm3_base_init(struct shash_desc *desc) | |
22 | { | |
23 | struct sm3_state *sctx = shash_desc_ctx(desc); | |
24 | ||
25 | sctx->state[0] = SM3_IVA; | |
26 | sctx->state[1] = SM3_IVB; | |
27 | sctx->state[2] = SM3_IVC; | |
28 | sctx->state[3] = SM3_IVD; | |
29 | sctx->state[4] = SM3_IVE; | |
30 | sctx->state[5] = SM3_IVF; | |
31 | sctx->state[6] = SM3_IVG; | |
32 | sctx->state[7] = SM3_IVH; | |
33 | sctx->count = 0; | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | static inline int sm3_base_do_update(struct shash_desc *desc, | |
39 | const u8 *data, | |
40 | unsigned int len, | |
41 | sm3_block_fn *block_fn) | |
42 | { | |
43 | struct sm3_state *sctx = shash_desc_ctx(desc); | |
44 | unsigned int partial = sctx->count % SM3_BLOCK_SIZE; | |
45 | ||
46 | sctx->count += len; | |
47 | ||
48 | if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) { | |
49 | int blocks; | |
50 | ||
51 | if (partial) { | |
52 | int p = SM3_BLOCK_SIZE - partial; | |
53 | ||
54 | memcpy(sctx->buffer + partial, data, p); | |
55 | data += p; | |
56 | len -= p; | |
57 | ||
58 | block_fn(sctx, sctx->buffer, 1); | |
59 | } | |
60 | ||
61 | blocks = len / SM3_BLOCK_SIZE; | |
62 | len %= SM3_BLOCK_SIZE; | |
63 | ||
64 | if (blocks) { | |
65 | block_fn(sctx, data, blocks); | |
66 | data += blocks * SM3_BLOCK_SIZE; | |
67 | } | |
68 | partial = 0; | |
69 | } | |
70 | if (len) | |
71 | memcpy(sctx->buffer + partial, data, len); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static inline int sm3_base_do_finalize(struct shash_desc *desc, | |
77 | sm3_block_fn *block_fn) | |
78 | { | |
79 | const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64); | |
80 | struct sm3_state *sctx = shash_desc_ctx(desc); | |
81 | __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); | |
82 | unsigned int partial = sctx->count % SM3_BLOCK_SIZE; | |
83 | ||
84 | sctx->buffer[partial++] = 0x80; | |
85 | if (partial > bit_offset) { | |
86 | memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial); | |
87 | partial = 0; | |
88 | ||
89 | block_fn(sctx, sctx->buffer, 1); | |
90 | } | |
91 | ||
92 | memset(sctx->buffer + partial, 0x0, bit_offset - partial); | |
93 | *bits = cpu_to_be64(sctx->count << 3); | |
94 | block_fn(sctx, sctx->buffer, 1); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static inline int sm3_base_finish(struct shash_desc *desc, u8 *out) | |
100 | { | |
101 | struct sm3_state *sctx = shash_desc_ctx(desc); | |
102 | __be32 *digest = (__be32 *)out; | |
103 | int i; | |
104 | ||
105 | for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++) | |
106 | put_unaligned_be32(sctx->state[i], digest++); | |
107 | ||
458c0480 | 108 | memzero_explicit(sctx, sizeof(*sctx)); |
4f0fc160 GBY |
109 | return 0; |
110 | } | |
68289c63 MY |
111 | |
112 | #endif /* _CRYPTO_SM3_BASE_H */ |