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