Commit | Line | Data |
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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
11b8d5ef AB |
2 | /* |
3 | * sha256_base.h - core logic for SHA-256 implementations | |
4 | * | |
5 | * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> | |
11b8d5ef AB |
6 | */ |
7 | ||
68289c63 MY |
8 | #ifndef _CRYPTO_SHA256_BASE_H |
9 | #define _CRYPTO_SHA256_BASE_H | |
10 | ||
11b8d5ef | 11 | #include <crypto/internal/hash.h> |
a24d22b2 | 12 | #include <crypto/sha2.h> |
11b8d5ef AB |
13 | #include <linux/crypto.h> |
14 | #include <linux/module.h> | |
458c0480 | 15 | #include <linux/string.h> |
11b8d5ef AB |
16 | |
17 | #include <asm/unaligned.h> | |
18 | ||
19 | typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src, | |
20 | int blocks); | |
21 | ||
22 | static inline int sha224_base_init(struct shash_desc *desc) | |
23 | { | |
24 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
25 | ||
13855fd8 EB |
26 | sha224_init(sctx); |
27 | return 0; | |
11b8d5ef AB |
28 | } |
29 | ||
30 | static inline int sha256_base_init(struct shash_desc *desc) | |
31 | { | |
32 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
33 | ||
13855fd8 EB |
34 | sha256_init(sctx); |
35 | return 0; | |
11b8d5ef AB |
36 | } |
37 | ||
38 | static inline int sha256_base_do_update(struct shash_desc *desc, | |
39 | const u8 *data, | |
40 | unsigned int len, | |
41 | sha256_block_fn *block_fn) | |
42 | { | |
43 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
44 | unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; | |
45 | ||
46 | sctx->count += len; | |
47 | ||
48 | if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) { | |
49 | int blocks; | |
50 | ||
51 | if (partial) { | |
52 | int p = SHA256_BLOCK_SIZE - partial; | |
53 | ||
54 | memcpy(sctx->buf + partial, data, p); | |
55 | data += p; | |
56 | len -= p; | |
57 | ||
58 | block_fn(sctx, sctx->buf, 1); | |
59 | } | |
60 | ||
61 | blocks = len / SHA256_BLOCK_SIZE; | |
62 | len %= SHA256_BLOCK_SIZE; | |
63 | ||
64 | if (blocks) { | |
65 | block_fn(sctx, data, blocks); | |
66 | data += blocks * SHA256_BLOCK_SIZE; | |
67 | } | |
68 | partial = 0; | |
69 | } | |
70 | if (len) | |
71 | memcpy(sctx->buf + partial, data, len); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static inline int sha256_base_do_finalize(struct shash_desc *desc, | |
77 | sha256_block_fn *block_fn) | |
78 | { | |
79 | const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64); | |
80 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
81 | __be64 *bits = (__be64 *)(sctx->buf + bit_offset); | |
82 | unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; | |
83 | ||
84 | sctx->buf[partial++] = 0x80; | |
85 | if (partial > bit_offset) { | |
86 | memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial); | |
87 | partial = 0; | |
88 | ||
89 | block_fn(sctx, sctx->buf, 1); | |
90 | } | |
91 | ||
92 | memset(sctx->buf + partial, 0x0, bit_offset - partial); | |
93 | *bits = cpu_to_be64(sctx->count << 3); | |
94 | block_fn(sctx, sctx->buf, 1); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static inline int sha256_base_finish(struct shash_desc *desc, u8 *out) | |
100 | { | |
101 | unsigned int digest_size = crypto_shash_digestsize(desc->tfm); | |
102 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
103 | __be32 *digest = (__be32 *)out; | |
104 | int i; | |
105 | ||
106 | for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32)) | |
107 | put_unaligned_be32(sctx->state[i], digest++); | |
108 | ||
458c0480 | 109 | memzero_explicit(sctx, sizeof(*sctx)); |
11b8d5ef AB |
110 | return 0; |
111 | } | |
68289c63 MY |
112 | |
113 | #endif /* _CRYPTO_SHA256_BASE_H */ |