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004a403c LH |
1 | /* |
2 | * Asynchronous Cryptographic Hash operations. | |
3 | * | |
4 | * This is the asynchronous version of hash.c with notification of | |
5 | * completion via a callback. | |
6 | * | |
7 | * Copyright (c) 2008 Loc Ho <lho@amcc.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
20036252 HX |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/scatterwalk.h> | |
004a403c LH |
18 | #include <linux/err.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/seq_file.h> | |
24 | ||
25 | #include "internal.h" | |
26 | ||
20036252 HX |
27 | static int hash_walk_next(struct crypto_hash_walk *walk) |
28 | { | |
29 | unsigned int alignmask = walk->alignmask; | |
30 | unsigned int offset = walk->offset; | |
31 | unsigned int nbytes = min(walk->entrylen, | |
32 | ((unsigned int)(PAGE_SIZE)) - offset); | |
33 | ||
34 | walk->data = crypto_kmap(walk->pg, 0); | |
35 | walk->data += offset; | |
36 | ||
37 | if (offset & alignmask) | |
38 | nbytes = alignmask + 1 - (offset & alignmask); | |
39 | ||
40 | walk->entrylen -= nbytes; | |
41 | return nbytes; | |
42 | } | |
43 | ||
44 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
45 | { | |
46 | struct scatterlist *sg; | |
47 | ||
48 | sg = walk->sg; | |
49 | walk->pg = sg_page(sg); | |
50 | walk->offset = sg->offset; | |
51 | walk->entrylen = sg->length; | |
52 | ||
53 | if (walk->entrylen > walk->total) | |
54 | walk->entrylen = walk->total; | |
55 | walk->total -= walk->entrylen; | |
56 | ||
57 | return hash_walk_next(walk); | |
58 | } | |
59 | ||
60 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) | |
61 | { | |
62 | unsigned int alignmask = walk->alignmask; | |
63 | unsigned int nbytes = walk->entrylen; | |
64 | ||
65 | walk->data -= walk->offset; | |
66 | ||
67 | if (nbytes && walk->offset & alignmask && !err) { | |
68 | walk->offset += alignmask - 1; | |
69 | walk->offset = ALIGN(walk->offset, alignmask + 1); | |
70 | walk->data += walk->offset; | |
71 | ||
72 | nbytes = min(nbytes, | |
73 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
74 | walk->entrylen -= nbytes; | |
75 | ||
76 | return nbytes; | |
77 | } | |
78 | ||
79 | crypto_kunmap(walk->data, 0); | |
80 | crypto_yield(walk->flags); | |
81 | ||
82 | if (err) | |
83 | return err; | |
84 | ||
85 | walk->offset = 0; | |
86 | ||
87 | if (nbytes) | |
88 | return hash_walk_next(walk); | |
89 | ||
90 | if (!walk->total) | |
91 | return 0; | |
92 | ||
93 | walk->sg = scatterwalk_sg_next(walk->sg); | |
94 | ||
95 | return hash_walk_new_entry(walk); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
98 | ||
99 | int crypto_hash_walk_first(struct ahash_request *req, | |
100 | struct crypto_hash_walk *walk) | |
101 | { | |
102 | walk->total = req->nbytes; | |
103 | ||
104 | if (!walk->total) | |
105 | return 0; | |
106 | ||
107 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
108 | walk->sg = req->src; | |
109 | walk->flags = req->base.flags; | |
110 | ||
111 | return hash_walk_new_entry(walk); | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
114 | ||
004a403c LH |
115 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
116 | unsigned int keylen) | |
117 | { | |
118 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); | |
119 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
120 | int ret; | |
121 | u8 *buffer, *alignbuffer; | |
122 | unsigned long absize; | |
123 | ||
124 | absize = keylen + alignmask; | |
125 | buffer = kmalloc(absize, GFP_ATOMIC); | |
126 | if (!buffer) | |
127 | return -ENOMEM; | |
128 | ||
129 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
130 | memcpy(alignbuffer, key, keylen); | |
131 | ret = ahash->setkey(tfm, alignbuffer, keylen); | |
132 | memset(alignbuffer, 0, keylen); | |
133 | kfree(buffer); | |
134 | return ret; | |
135 | } | |
136 | ||
137 | static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key, | |
138 | unsigned int keylen) | |
139 | { | |
140 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); | |
141 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
142 | ||
143 | if ((unsigned long)key & alignmask) | |
144 | return ahash_setkey_unaligned(tfm, key, keylen); | |
145 | ||
146 | return ahash->setkey(tfm, key, keylen); | |
147 | } | |
148 | ||
149 | static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type, | |
150 | u32 mask) | |
151 | { | |
152 | return alg->cra_ctxsize; | |
153 | } | |
154 | ||
155 | static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) | |
156 | { | |
157 | struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash; | |
158 | struct ahash_tfm *crt = &tfm->crt_ahash; | |
159 | ||
ca786dc7 | 160 | if (alg->digestsize > PAGE_SIZE / 8) |
004a403c LH |
161 | return -EINVAL; |
162 | ||
163 | crt->init = alg->init; | |
164 | crt->update = alg->update; | |
165 | crt->final = alg->final; | |
166 | crt->digest = alg->digest; | |
167 | crt->setkey = ahash_setkey; | |
004a403c LH |
168 | crt->digestsize = alg->digestsize; |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
174 | __attribute__ ((unused)); | |
175 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
176 | { | |
177 | seq_printf(m, "type : ahash\n"); | |
178 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
179 | "yes" : "no"); | |
180 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
181 | seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize); | |
182 | } | |
183 | ||
184 | const struct crypto_type crypto_ahash_type = { | |
185 | .ctxsize = crypto_ahash_ctxsize, | |
186 | .init = crypto_init_ahash_ops, | |
187 | #ifdef CONFIG_PROC_FS | |
188 | .show = crypto_ahash_show, | |
189 | #endif | |
190 | }; | |
191 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
192 | ||
193 | MODULE_LICENSE("GPL"); | |
194 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |