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Commit | Line | Data |
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1da177e4 LT |
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 | { | |
6c2bb98b | 23 | tfm->__crt_alg->cra_digest.dia_init(tfm); |
1da177e4 LT |
24 | } |
25 | ||
26 | static void update(struct crypto_tfm *tfm, | |
27 | struct scatterlist *sg, unsigned int nsg) | |
28 | { | |
29 | unsigned int i; | |
e1147d8f | 30 | unsigned int alignmask = crypto_tfm_alg_alignmask(tfm); |
1da177e4 LT |
31 | |
32 | for (i = 0; i < nsg; i++) { | |
33 | ||
34 | struct page *pg = sg[i].page; | |
35 | unsigned int offset = sg[i].offset; | |
36 | unsigned int l = sg[i].length; | |
37 | ||
38 | do { | |
39 | unsigned int bytes_from_page = min(l, ((unsigned int) | |
40 | (PAGE_SIZE)) - | |
41 | offset); | |
e1147d8f AN |
42 | char *src = crypto_kmap(pg, 0); |
43 | char *p = src + offset; | |
1da177e4 | 44 | |
e1147d8f AN |
45 | if (unlikely(offset & alignmask)) { |
46 | unsigned int bytes = | |
47 | alignmask + 1 - (offset & alignmask); | |
48 | bytes = min(bytes, bytes_from_page); | |
6c2bb98b HX |
49 | tfm->__crt_alg->cra_digest.dia_update(tfm, p, |
50 | bytes); | |
e1147d8f AN |
51 | p += bytes; |
52 | bytes_from_page -= bytes; | |
53 | l -= bytes; | |
54 | } | |
6c2bb98b HX |
55 | tfm->__crt_alg->cra_digest.dia_update(tfm, p, |
56 | bytes_from_page); | |
e1147d8f | 57 | crypto_kunmap(src, 0); |
8f21cf0d | 58 | crypto_yield(tfm->crt_flags); |
1da177e4 LT |
59 | offset = 0; |
60 | pg++; | |
61 | l -= bytes_from_page; | |
62 | } while (l > 0); | |
63 | } | |
64 | } | |
65 | ||
66 | static void final(struct crypto_tfm *tfm, u8 *out) | |
67 | { | |
e1147d8f | 68 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
ee756416 HX |
69 | struct digest_alg *digest = &tfm->__crt_alg->cra_digest; |
70 | ||
e1147d8f | 71 | if (unlikely((unsigned long)out & alignmask)) { |
ee756416 HX |
72 | unsigned long align = alignmask + 1; |
73 | unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); | |
74 | u8 *dst = (u8 *)ALIGN(addr, align) + | |
75 | ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
76 | ||
77 | digest->dia_final(tfm, dst); | |
78 | memcpy(out, dst, digest->dia_digestsize); | |
e1147d8f | 79 | } else |
ee756416 | 80 | digest->dia_final(tfm, out); |
1da177e4 LT |
81 | } |
82 | ||
560c06ae HX |
83 | static int nosetkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
84 | { | |
85 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; | |
86 | return -ENOSYS; | |
87 | } | |
88 | ||
1da177e4 LT |
89 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
90 | { | |
560c06ae HX |
91 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
92 | return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen); | |
1da177e4 LT |
93 | } |
94 | ||
95 | static void digest(struct crypto_tfm *tfm, | |
96 | struct scatterlist *sg, unsigned int nsg, u8 *out) | |
97 | { | |
e1147d8f AN |
98 | init(tfm); |
99 | update(tfm, sg, nsg); | |
100 | final(tfm, out); | |
1da177e4 LT |
101 | } |
102 | ||
103 | int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) | |
104 | { | |
105 | return flags ? -EINVAL : 0; | |
106 | } | |
107 | ||
108 | int crypto_init_digest_ops(struct crypto_tfm *tfm) | |
109 | { | |
110 | struct digest_tfm *ops = &tfm->crt_digest; | |
560c06ae | 111 | struct digest_alg *dalg = &tfm->__crt_alg->cra_digest; |
1da177e4 LT |
112 | |
113 | ops->dit_init = init; | |
114 | ops->dit_update = update; | |
115 | ops->dit_final = final; | |
116 | ops->dit_digest = digest; | |
560c06ae | 117 | ops->dit_setkey = dalg->dia_setkey ? setkey : nosetkey; |
1da177e4 LT |
118 | |
119 | return crypto_alloc_hmac_block(tfm); | |
120 | } | |
121 | ||
122 | void crypto_exit_digest_ops(struct crypto_tfm *tfm) | |
123 | { | |
124 | crypto_free_hmac_block(tfm); | |
125 | } |