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
|
/*
* 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/crypto.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/highmem.h>
#include <asm/scatterlist.h>
#include "internal.h"
static void init(struct crypto_tfm *tfm)
{
tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
}
static void update(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg)
{
unsigned int i;
for (i = 0; i < nsg; i++) {
struct page *pg = sg[i].page;
unsigned int offset = sg[i].offset;
unsigned int l = sg[i].length;
do {
unsigned int bytes_from_page = min(l, ((unsigned int)
(PAGE_SIZE)) -
offset);
char *p = crypto_kmap(pg, 0) + offset;
tfm->__crt_alg->cra_digest.dia_update
(crypto_tfm_ctx(tfm), p,
bytes_from_page);
crypto_kunmap(p, 0);
crypto_yield(tfm);
offset = 0;
pg++;
l -= bytes_from_page;
} while (l > 0);
}
}
static void final(struct crypto_tfm *tfm, u8 *out)
{
tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
}
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
u32 flags;
if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
return -ENOSYS;
return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
key, keylen, &flags);
}
static void digest(struct crypto_tfm *tfm,
struct scatterlist *sg, unsigned int nsg, u8 *out)
{
unsigned int i;
tfm->crt_digest.dit_init(tfm);
for (i = 0; i < nsg; i++) {
char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
p, sg[i].length);
crypto_kunmap(p, 0);
crypto_yield(tfm);
}
crypto_digest_final(tfm, 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 digest_tfm *ops = &tfm->crt_digest;
ops->dit_init = init;
ops->dit_update = update;
ops->dit_final = final;
ops->dit_digest = digest;
ops->dit_setkey = setkey;
return crypto_alloc_hmac_block(tfm);
}
void crypto_exit_digest_ops(struct crypto_tfm *tfm)
{
crypto_free_hmac_block(tfm);
}
|
