1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Cryptographic API.
*
* Digest operations.
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include "internal.h"
#include "scatterwalk.h"
void crypto_digest_init(struct crypto_tfm *tfm)
{
struct crypto_hash *hash = crypto_hash_cast(tfm);
struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
crypto_hash_init(&desc);
}
EXPORT_SYMBOL_GPL(crypto_digest_init);
void crypto_digest_update(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg)
{
struct crypto_hash *hash = crypto_hash_cast(tfm);
struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
unsigned int nbytes = 0;
unsigned int i;
for (i = 0; i < nsg; i++)
nbytes += sg[i].length;
crypto_hash_update(&desc, sg, nbytes);
}
EXPORT_SYMBOL_GPL(crypto_digest_update);
void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
{
struct crypto_hash *hash = crypto_hash_cast(tfm);
struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
crypto_hash_final(&desc, out);
}
EXPORT_SYMBOL_GPL(crypto_digest_final);
void crypto_digest_digest(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg, u8 *out)
{
struct crypto_hash *hash = crypto_hash_cast(tfm);
struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
unsigned int nbytes = 0;
unsigned int i;
for (i = 0; i < nsg; i++)
nbytes += sg[i].length;
crypto_hash_digest(&desc, sg, nbytes, out);
}
EXPORT_SYMBOL_GPL(crypto_digest_digest);
static int init(struct hash_desc *desc)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
tfm->__crt_alg->cra_digest.dia_init(tfm);
return 0;
}
static int update(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
if (!nbytes)
return 0;
for (;;) {
struct page *pg = sg->page;
unsigned int offset = sg->offset;
unsigned int l = sg->length;
if (unlikely(l > nbytes))
l = nbytes;
nbytes -= l;
do {
unsigned int bytes_from_page = min(l, ((unsigned int)
(PAGE_SIZE)) -
offset);
char *src = crypto_kmap(pg, 0);
char *p = src + offset;
if (unlikely(offset & alignmask)) {
unsigned int bytes =
alignmask + 1 - (offset & alignmask);
bytes = min(bytes, bytes_from_page);
tfm->__crt_alg->cra_digest.dia_update(tfm, p,
bytes);
p += bytes;
bytes_from_page -= bytes;
l -= bytes;
}
tfm->__crt_alg->cra_digest.dia_update(tfm, p,
bytes_from_page);
crypto_kunmap(src, 0);
crypto_yield(desc->flags);
offset = 0;
pg++;
l -= bytes_from_page;
} while (l > 0);
if (!nbytes)
break;
sg = sg_next(sg);
}
return 0;
}
static int final(struct hash_desc *desc, u8 *out)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
if (unlikely((unsigned long)out & alignmask)) {
unsigned long align = alignmask + 1;
unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
u8 *dst = (u8 *)ALIGN(addr, align) +
ALIGN(tfm->__crt_alg->cra_ctxsize, align);
digest->dia_final(tfm, dst);
memcpy(out, dst, digest->dia_digestsize);
} else
digest->dia_final(tfm, out);
return 0;
}
static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
{
crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
return -ENOSYS;
}
static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(hash);
crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
}
static int digest(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes, u8 *out)
{
init(desc);
update(desc, sg, nbytes);
return final(desc, out);
}
int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
{
return flags ? -EINVAL : 0;
}
int crypto_init_digest_ops(struct crypto_tfm *tfm)
{
struct hash_tfm *ops = &tfm->crt_hash;
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
return -EINVAL;
ops->init = init;
ops->update = update;
ops->final = final;
ops->digest = digest;
ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
ops->digestsize = dalg->dia_digestsize;
return crypto_alloc_hmac_block(tfm);
}
void crypto_exit_digest_ops(struct crypto_tfm *tfm)
{
crypto_free_hmac_block(tfm);
}
|
