Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/crypto/digest.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 2554 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * Digest operations. |
5 | * |
6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public License as published by the Free |
10 | * Software Foundation; either version 2 of the License, or (at your option) |
11 | * any later version. |
12 | * |
13 | */ |
14 | #include <linux/crypto.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/highmem.h> |
18 | #include <asm/scatterlist.h> |
19 | #include "internal.h" |
20 | |
21 | static void init(struct crypto_tfm *tfm) |
22 | { |
23 | tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm)); |
24 | } |
25 | |
26 | static void update(struct crypto_tfm *tfm, |
27 | struct scatterlist *sg, unsigned int nsg) |
28 | { |
29 | unsigned int i; |
30 | |
31 | for (i = 0; i < nsg; i++) { |
32 | |
33 | struct page *pg = sg[i].page; |
34 | unsigned int offset = sg[i].offset; |
35 | unsigned int l = sg[i].length; |
36 | |
37 | do { |
38 | unsigned int bytes_from_page = min(l, ((unsigned int) |
39 | (PAGE_SIZE)) - |
40 | offset); |
41 | char *p = crypto_kmap(pg, 0) + offset; |
42 | |
43 | tfm->__crt_alg->cra_digest.dia_update |
44 | (crypto_tfm_ctx(tfm), p, |
45 | bytes_from_page); |
46 | crypto_kunmap(p, 0); |
47 | crypto_yield(tfm); |
48 | offset = 0; |
49 | pg++; |
50 | l -= bytes_from_page; |
51 | } while (l > 0); |
52 | } |
53 | } |
54 | |
55 | static void final(struct crypto_tfm *tfm, u8 *out) |
56 | { |
57 | tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out); |
58 | } |
59 | |
60 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
61 | { |
62 | u32 flags; |
63 | if (tfm->__crt_alg->cra_digest.dia_setkey == NULL) |
64 | return -ENOSYS; |
65 | return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm), |
66 | key, keylen, &flags); |
67 | } |
68 | |
69 | static void digest(struct crypto_tfm *tfm, |
70 | struct scatterlist *sg, unsigned int nsg, u8 *out) |
71 | { |
72 | unsigned int i; |
73 | |
74 | tfm->crt_digest.dit_init(tfm); |
75 | |
76 | for (i = 0; i < nsg; i++) { |
77 | char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset; |
78 | tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm), |
79 | p, sg[i].length); |
80 | crypto_kunmap(p, 0); |
81 | crypto_yield(tfm); |
82 | } |
83 | crypto_digest_final(tfm, out); |
84 | } |
85 | |
86 | int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) |
87 | { |
88 | return flags ? -EINVAL : 0; |
89 | } |
90 | |
91 | int crypto_init_digest_ops(struct crypto_tfm *tfm) |
92 | { |
93 | struct digest_tfm *ops = &tfm->crt_digest; |
94 | |
95 | ops->dit_init = init; |
96 | ops->dit_update = update; |
97 | ops->dit_final = final; |
98 | ops->dit_digest = digest; |
99 | ops->dit_setkey = setkey; |
100 | |
101 | return crypto_alloc_hmac_block(tfm); |
102 | } |
103 | |
104 | void crypto_exit_digest_ops(struct crypto_tfm *tfm) |
105 | { |
106 | crypto_free_hmac_block(tfm); |
107 | } |