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Linux kernel mirror (for testing)
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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#ifndef _CRYPTO_SHA1_BASE_H
9#define _CRYPTO_SHA1_BASE_H
10
11#include <crypto/internal/hash.h>
12#include <crypto/sha1.h>
13#include <linux/math.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/unaligned.h>
17
18typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
19
20static inline int sha1_base_init(struct shash_desc *desc)
21{
22 struct sha1_state *sctx = shash_desc_ctx(desc);
23
24 sctx->state[0] = SHA1_H0;
25 sctx->state[1] = SHA1_H1;
26 sctx->state[2] = SHA1_H2;
27 sctx->state[3] = SHA1_H3;
28 sctx->state[4] = SHA1_H4;
29 sctx->count = 0;
30
31 return 0;
32}
33
34static inline int sha1_base_do_update_blocks(struct shash_desc *desc,
35 const u8 *data,
36 unsigned int len,
37 sha1_block_fn *block_fn)
38{
39 unsigned int remain = len - round_down(len, SHA1_BLOCK_SIZE);
40 struct sha1_state *sctx = shash_desc_ctx(desc);
41
42 sctx->count += len - remain;
43 block_fn(sctx, data, len / SHA1_BLOCK_SIZE);
44 return remain;
45}
46
47static inline int sha1_base_do_finup(struct shash_desc *desc,
48 const u8 *src, unsigned int len,
49 sha1_block_fn *block_fn)
50{
51 unsigned int bit_offset = SHA1_BLOCK_SIZE / 8 - 1;
52 struct sha1_state *sctx = shash_desc_ctx(desc);
53 union {
54 __be64 b64[SHA1_BLOCK_SIZE / 4];
55 u8 u8[SHA1_BLOCK_SIZE * 2];
56 } block = {};
57
58 if (len >= bit_offset * 8)
59 bit_offset += SHA1_BLOCK_SIZE / 8;
60 memcpy(&block, src, len);
61 block.u8[len] = 0x80;
62 sctx->count += len;
63 block.b64[bit_offset] = cpu_to_be64(sctx->count << 3);
64 block_fn(sctx, block.u8, (bit_offset + 1) * 8 / SHA1_BLOCK_SIZE);
65 memzero_explicit(&block, sizeof(block));
66
67 return 0;
68}
69
70static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
71{
72 struct sha1_state *sctx = shash_desc_ctx(desc);
73 __be32 *digest = (__be32 *)out;
74 int i;
75
76 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
77 put_unaligned_be32(sctx->state[i], digest++);
78
79 return 0;
80}
81
82#endif /* _CRYPTO_SHA1_BASE_H */