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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
c4d5b9ff AB |
2 | /* |
3 | * sha1_base.h - core logic for SHA-1 implementations | |
4 | * | |
5 | * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> | |
c4d5b9ff AB |
6 | */ |
7 | ||
68289c63 MY |
8 | #ifndef _CRYPTO_SHA1_BASE_H |
9 | #define _CRYPTO_SHA1_BASE_H | |
10 | ||
c4d5b9ff | 11 | #include <crypto/internal/hash.h> |
a24d22b2 | 12 | #include <crypto/sha1.h> |
c4d5b9ff AB |
13 | #include <linux/crypto.h> |
14 | #include <linux/module.h> | |
458c0480 | 15 | #include <linux/string.h> |
c4d5b9ff AB |
16 | |
17 | #include <asm/unaligned.h> | |
18 | ||
19 | typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks); | |
20 | ||
21 | static inline int sha1_base_init(struct shash_desc *desc) | |
22 | { | |
23 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
24 | ||
25 | sctx->state[0] = SHA1_H0; | |
26 | sctx->state[1] = SHA1_H1; | |
27 | sctx->state[2] = SHA1_H2; | |
28 | sctx->state[3] = SHA1_H3; | |
29 | sctx->state[4] = SHA1_H4; | |
30 | sctx->count = 0; | |
31 | ||
32 | return 0; | |
33 | } | |
34 | ||
35 | static inline int sha1_base_do_update(struct shash_desc *desc, | |
36 | const u8 *data, | |
37 | unsigned int len, | |
38 | sha1_block_fn *block_fn) | |
39 | { | |
40 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
41 | unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; | |
42 | ||
43 | sctx->count += len; | |
44 | ||
45 | if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) { | |
46 | int blocks; | |
47 | ||
48 | if (partial) { | |
49 | int p = SHA1_BLOCK_SIZE - partial; | |
50 | ||
51 | memcpy(sctx->buffer + partial, data, p); | |
52 | data += p; | |
53 | len -= p; | |
54 | ||
55 | block_fn(sctx, sctx->buffer, 1); | |
56 | } | |
57 | ||
58 | blocks = len / SHA1_BLOCK_SIZE; | |
59 | len %= SHA1_BLOCK_SIZE; | |
60 | ||
61 | if (blocks) { | |
62 | block_fn(sctx, data, blocks); | |
63 | data += blocks * SHA1_BLOCK_SIZE; | |
64 | } | |
65 | partial = 0; | |
66 | } | |
67 | if (len) | |
68 | memcpy(sctx->buffer + partial, data, len); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static inline int sha1_base_do_finalize(struct shash_desc *desc, | |
74 | sha1_block_fn *block_fn) | |
75 | { | |
76 | const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64); | |
77 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
78 | __be64 *bits = (__be64 *)(sctx->buffer + bit_offset); | |
79 | unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; | |
80 | ||
81 | sctx->buffer[partial++] = 0x80; | |
82 | if (partial > bit_offset) { | |
83 | memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial); | |
84 | partial = 0; | |
85 | ||
86 | block_fn(sctx, sctx->buffer, 1); | |
87 | } | |
88 | ||
89 | memset(sctx->buffer + partial, 0x0, bit_offset - partial); | |
90 | *bits = cpu_to_be64(sctx->count << 3); | |
91 | block_fn(sctx, sctx->buffer, 1); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static inline int sha1_base_finish(struct shash_desc *desc, u8 *out) | |
97 | { | |
98 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
99 | __be32 *digest = (__be32 *)out; | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++) | |
103 | put_unaligned_be32(sctx->state[i], digest++); | |
104 | ||
458c0480 | 105 | memzero_explicit(sctx, sizeof(*sctx)); |
c4d5b9ff AB |
106 | return 0; |
107 | } | |
68289c63 MY |
108 | |
109 | #endif /* _CRYPTO_SHA1_BASE_H */ |