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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * sha512_base.h - core logic for SHA-512 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 (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
16 int blocks);
17
18static inline int sha384_base_init(struct shash_desc *desc)
19{
20 struct sha512_state *sctx = shash_desc_ctx(desc);
21
22 sctx->state[0] = SHA384_H0;
23 sctx->state[1] = SHA384_H1;
24 sctx->state[2] = SHA384_H2;
25 sctx->state[3] = SHA384_H3;
26 sctx->state[4] = SHA384_H4;
27 sctx->state[5] = SHA384_H5;
28 sctx->state[6] = SHA384_H6;
29 sctx->state[7] = SHA384_H7;
30 sctx->count[0] = sctx->count[1] = 0;
31
32 return 0;
33}
34
35static inline int sha512_base_init(struct shash_desc *desc)
36{
37 struct sha512_state *sctx = shash_desc_ctx(desc);
38
39 sctx->state[0] = SHA512_H0;
40 sctx->state[1] = SHA512_H1;
41 sctx->state[2] = SHA512_H2;
42 sctx->state[3] = SHA512_H3;
43 sctx->state[4] = SHA512_H4;
44 sctx->state[5] = SHA512_H5;
45 sctx->state[6] = SHA512_H6;
46 sctx->state[7] = SHA512_H7;
47 sctx->count[0] = sctx->count[1] = 0;
48
49 return 0;
50}
51
52static inline int sha512_base_do_update(struct shash_desc *desc,
53 const u8 *data,
54 unsigned int len,
55 sha512_block_fn *block_fn)
56{
57 struct sha512_state *sctx = shash_desc_ctx(desc);
58 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
59
60 sctx->count[0] += len;
61 if (sctx->count[0] < len)
62 sctx->count[1]++;
63
64 if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
65 int blocks;
66
67 if (partial) {
68 int p = SHA512_BLOCK_SIZE - partial;
69
70 memcpy(sctx->buf + partial, data, p);
71 data += p;
72 len -= p;
73
74 block_fn(sctx, sctx->buf, 1);
75 }
76
77 blocks = len / SHA512_BLOCK_SIZE;
78 len %= SHA512_BLOCK_SIZE;
79
80 if (blocks) {
81 block_fn(sctx, data, blocks);
82 data += blocks * SHA512_BLOCK_SIZE;
83 }
84 partial = 0;
85 }
86 if (len)
87 memcpy(sctx->buf + partial, data, len);
88
89 return 0;
90}
91
92static inline int sha512_base_do_finalize(struct shash_desc *desc,
93 sha512_block_fn *block_fn)
94{
95 const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
96 struct sha512_state *sctx = shash_desc_ctx(desc);
97 __be64 *bits = (__be64 *)(sctx->buf + bit_offset);
98 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
99
100 sctx->buf[partial++] = 0x80;
101 if (partial > bit_offset) {
102 memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
103 partial = 0;
104
105 block_fn(sctx, sctx->buf, 1);
106 }
107
108 memset(sctx->buf + partial, 0x0, bit_offset - partial);
109 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
110 bits[1] = cpu_to_be64(sctx->count[0] << 3);
111 block_fn(sctx, sctx->buf, 1);
112
113 return 0;
114}
115
116static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
117{
118 unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
119 struct sha512_state *sctx = shash_desc_ctx(desc);
120 __be64 *digest = (__be64 *)out;
121 int i;
122
123 for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
124 put_unaligned_be64(sctx->state[i], digest++);
125
126 *sctx = (struct sha512_state){};
127 return 0;
128}