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