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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 | */ | |
055bcee3 | 14 | |
1da177e4 LT |
15 | #include <linux/mm.h> |
16 | #include <linux/errno.h> | |
17 | #include <linux/highmem.h> | |
055bcee3 HX |
18 | #include <linux/module.h> |
19 | #include <linux/scatterlist.h> | |
20 | ||
1da177e4 | 21 | #include "internal.h" |
055bcee3 | 22 | #include "scatterwalk.h" |
1da177e4 | 23 | |
055bcee3 HX |
24 | static int init(struct hash_desc *desc) |
25 | { | |
26 | struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm); | |
27 | ||
28 | tfm->__crt_alg->cra_digest.dia_init(tfm); | |
29 | return 0; | |
30 | } | |
31 | ||
32 | static int update(struct hash_desc *desc, | |
33 | struct scatterlist *sg, unsigned int nbytes) | |
34 | { | |
35 | struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm); | |
e1147d8f | 36 | unsigned int alignmask = crypto_tfm_alg_alignmask(tfm); |
1da177e4 | 37 | |
055bcee3 HX |
38 | if (!nbytes) |
39 | return 0; | |
40 | ||
41 | for (;;) { | |
42 | struct page *pg = sg->page; | |
43 | unsigned int offset = sg->offset; | |
44 | unsigned int l = sg->length; | |
1da177e4 | 45 | |
055bcee3 HX |
46 | if (unlikely(l > nbytes)) |
47 | l = nbytes; | |
48 | nbytes -= l; | |
1da177e4 LT |
49 | |
50 | do { | |
51 | unsigned int bytes_from_page = min(l, ((unsigned int) | |
52 | (PAGE_SIZE)) - | |
53 | offset); | |
e1147d8f AN |
54 | char *src = crypto_kmap(pg, 0); |
55 | char *p = src + offset; | |
1da177e4 | 56 | |
e1147d8f AN |
57 | if (unlikely(offset & alignmask)) { |
58 | unsigned int bytes = | |
59 | alignmask + 1 - (offset & alignmask); | |
60 | bytes = min(bytes, bytes_from_page); | |
6c2bb98b HX |
61 | tfm->__crt_alg->cra_digest.dia_update(tfm, p, |
62 | bytes); | |
e1147d8f AN |
63 | p += bytes; |
64 | bytes_from_page -= bytes; | |
65 | l -= bytes; | |
66 | } | |
6c2bb98b HX |
67 | tfm->__crt_alg->cra_digest.dia_update(tfm, p, |
68 | bytes_from_page); | |
e1147d8f | 69 | crypto_kunmap(src, 0); |
055bcee3 | 70 | crypto_yield(desc->flags); |
1da177e4 LT |
71 | offset = 0; |
72 | pg++; | |
73 | l -= bytes_from_page; | |
74 | } while (l > 0); | |
055bcee3 HX |
75 | |
76 | if (!nbytes) | |
77 | break; | |
78 | sg = sg_next(sg); | |
1da177e4 | 79 | } |
055bcee3 HX |
80 | |
81 | return 0; | |
1da177e4 LT |
82 | } |
83 | ||
055bcee3 | 84 | static int final(struct hash_desc *desc, u8 *out) |
1da177e4 | 85 | { |
055bcee3 | 86 | struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm); |
e1147d8f | 87 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
ee756416 HX |
88 | struct digest_alg *digest = &tfm->__crt_alg->cra_digest; |
89 | ||
e1147d8f | 90 | if (unlikely((unsigned long)out & alignmask)) { |
ee756416 HX |
91 | unsigned long align = alignmask + 1; |
92 | unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); | |
93 | u8 *dst = (u8 *)ALIGN(addr, align) + | |
94 | ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
95 | ||
96 | digest->dia_final(tfm, dst); | |
97 | memcpy(out, dst, digest->dia_digestsize); | |
e1147d8f | 98 | } else |
ee756416 | 99 | digest->dia_final(tfm, out); |
055bcee3 HX |
100 | |
101 | return 0; | |
1da177e4 LT |
102 | } |
103 | ||
055bcee3 | 104 | static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen) |
560c06ae | 105 | { |
055bcee3 | 106 | crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK); |
560c06ae HX |
107 | return -ENOSYS; |
108 | } | |
109 | ||
055bcee3 | 110 | static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen) |
1da177e4 | 111 | { |
055bcee3 HX |
112 | struct crypto_tfm *tfm = crypto_hash_tfm(hash); |
113 | ||
114 | crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK); | |
560c06ae | 115 | return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen); |
1da177e4 LT |
116 | } |
117 | ||
055bcee3 HX |
118 | static int digest(struct hash_desc *desc, |
119 | struct scatterlist *sg, unsigned int nbytes, u8 *out) | |
1da177e4 | 120 | { |
055bcee3 HX |
121 | init(desc); |
122 | update(desc, sg, nbytes); | |
123 | return final(desc, out); | |
1da177e4 LT |
124 | } |
125 | ||
126 | int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) | |
127 | { | |
128 | return flags ? -EINVAL : 0; | |
129 | } | |
130 | ||
131 | int crypto_init_digest_ops(struct crypto_tfm *tfm) | |
132 | { | |
055bcee3 | 133 | struct hash_tfm *ops = &tfm->crt_hash; |
560c06ae | 134 | struct digest_alg *dalg = &tfm->__crt_alg->cra_digest; |
055bcee3 HX |
135 | |
136 | if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm)) | |
137 | return -EINVAL; | |
1da177e4 | 138 | |
055bcee3 HX |
139 | ops->init = init; |
140 | ops->update = update; | |
141 | ops->final = final; | |
142 | ops->digest = digest; | |
143 | ops->setkey = dalg->dia_setkey ? setkey : nosetkey; | |
144 | ops->digestsize = dalg->dia_digestsize; | |
1da177e4 | 145 | |
8425165d | 146 | return 0; |
1da177e4 LT |
147 | } |
148 | ||
149 | void crypto_exit_digest_ops(struct crypto_tfm *tfm) | |
150 | { | |
1da177e4 | 151 | } |