ALSA: hda/realtek - Move some alc236 pintbls to fallback table
[sfrench/cifs-2.6.git] / include / crypto / sha512_base.h
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 #ifndef _CRYPTO_SHA512_BASE_H
9 #define _CRYPTO_SHA512_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
18 typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
19                                int blocks);
20
21 static inline int sha384_base_init(struct shash_desc *desc)
22 {
23         struct sha512_state *sctx = shash_desc_ctx(desc);
24
25         sctx->state[0] = SHA384_H0;
26         sctx->state[1] = SHA384_H1;
27         sctx->state[2] = SHA384_H2;
28         sctx->state[3] = SHA384_H3;
29         sctx->state[4] = SHA384_H4;
30         sctx->state[5] = SHA384_H5;
31         sctx->state[6] = SHA384_H6;
32         sctx->state[7] = SHA384_H7;
33         sctx->count[0] = sctx->count[1] = 0;
34
35         return 0;
36 }
37
38 static inline int sha512_base_init(struct shash_desc *desc)
39 {
40         struct sha512_state *sctx = shash_desc_ctx(desc);
41
42         sctx->state[0] = SHA512_H0;
43         sctx->state[1] = SHA512_H1;
44         sctx->state[2] = SHA512_H2;
45         sctx->state[3] = SHA512_H3;
46         sctx->state[4] = SHA512_H4;
47         sctx->state[5] = SHA512_H5;
48         sctx->state[6] = SHA512_H6;
49         sctx->state[7] = SHA512_H7;
50         sctx->count[0] = sctx->count[1] = 0;
51
52         return 0;
53 }
54
55 static inline int sha512_base_do_update(struct shash_desc *desc,
56                                         const u8 *data,
57                                         unsigned int len,
58                                         sha512_block_fn *block_fn)
59 {
60         struct sha512_state *sctx = shash_desc_ctx(desc);
61         unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
62
63         sctx->count[0] += len;
64         if (sctx->count[0] < len)
65                 sctx->count[1]++;
66
67         if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
68                 int blocks;
69
70                 if (partial) {
71                         int p = SHA512_BLOCK_SIZE - partial;
72
73                         memcpy(sctx->buf + partial, data, p);
74                         data += p;
75                         len -= p;
76
77                         block_fn(sctx, sctx->buf, 1);
78                 }
79
80                 blocks = len / SHA512_BLOCK_SIZE;
81                 len %= SHA512_BLOCK_SIZE;
82
83                 if (blocks) {
84                         block_fn(sctx, data, blocks);
85                         data += blocks * SHA512_BLOCK_SIZE;
86                 }
87                 partial = 0;
88         }
89         if (len)
90                 memcpy(sctx->buf + partial, data, len);
91
92         return 0;
93 }
94
95 static inline int sha512_base_do_finalize(struct shash_desc *desc,
96                                           sha512_block_fn *block_fn)
97 {
98         const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
99         struct sha512_state *sctx = shash_desc_ctx(desc);
100         __be64 *bits = (__be64 *)(sctx->buf + bit_offset);
101         unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
102
103         sctx->buf[partial++] = 0x80;
104         if (partial > bit_offset) {
105                 memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
106                 partial = 0;
107
108                 block_fn(sctx, sctx->buf, 1);
109         }
110
111         memset(sctx->buf + partial, 0x0, bit_offset - partial);
112         bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
113         bits[1] = cpu_to_be64(sctx->count[0] << 3);
114         block_fn(sctx, sctx->buf, 1);
115
116         return 0;
117 }
118
119 static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
120 {
121         unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
122         struct sha512_state *sctx = shash_desc_ctx(desc);
123         __be64 *digest = (__be64 *)out;
124         int i;
125
126         for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
127                 put_unaligned_be64(sctx->state[i], digest++);
128
129         *sctx = (struct sha512_state){};
130         return 0;
131 }
132
133 #endif /* _CRYPTO_SHA512_BASE_H */