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055bcee3 HX |
1 | /* |
2 | * Cryptographic Hash operations. | |
3 | * | |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/errno.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
791b4d5f | 15 | #include <linux/slab.h> |
055bcee3 HX |
16 | #include <linux/seq_file.h> |
17 | ||
18 | #include "internal.h" | |
19 | ||
27d2a330 HX |
20 | static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type, |
21 | u32 mask) | |
055bcee3 HX |
22 | { |
23 | return alg->cra_ctxsize; | |
24 | } | |
25 | ||
ca7c3938 SS |
26 | static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key, |
27 | unsigned int keylen) | |
28 | { | |
29 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); | |
30 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
31 | unsigned long alignmask = crypto_hash_alignmask(crt); | |
32 | int ret; | |
33 | u8 *buffer, *alignbuffer; | |
34 | unsigned long absize; | |
35 | ||
36 | absize = keylen + alignmask; | |
37 | buffer = kmalloc(absize, GFP_ATOMIC); | |
38 | if (!buffer) | |
39 | return -ENOMEM; | |
40 | ||
41 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
42 | memcpy(alignbuffer, key, keylen); | |
43 | ret = alg->setkey(crt, alignbuffer, keylen); | |
06817176 | 44 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
45 | kfree(buffer); |
46 | return ret; | |
47 | } | |
48 | ||
49 | static int hash_setkey(struct crypto_hash *crt, const u8 *key, | |
791b4d5f | 50 | unsigned int keylen) |
ca7c3938 SS |
51 | { |
52 | struct crypto_tfm *tfm = crypto_hash_tfm(crt); | |
53 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
54 | unsigned long alignmask = crypto_hash_alignmask(crt); | |
55 | ||
56 | if ((unsigned long)key & alignmask) | |
57 | return hash_setkey_unaligned(crt, key, keylen); | |
58 | ||
59 | return alg->setkey(crt, key, keylen); | |
60 | } | |
61 | ||
27d2a330 | 62 | static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
055bcee3 HX |
63 | { |
64 | struct hash_tfm *crt = &tfm->crt_hash; | |
65 | struct hash_alg *alg = &tfm->__crt_alg->cra_hash; | |
66 | ||
67 | if (alg->digestsize > crypto_tfm_alg_blocksize(tfm)) | |
68 | return -EINVAL; | |
69 | ||
70 | crt->init = alg->init; | |
71 | crt->update = alg->update; | |
72 | crt->final = alg->final; | |
73 | crt->digest = alg->digest; | |
ca7c3938 | 74 | crt->setkey = hash_setkey; |
055bcee3 HX |
75 | crt->digestsize = alg->digestsize; |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) | |
03f5d8ce | 81 | __attribute__ ((unused)); |
055bcee3 HX |
82 | static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) |
83 | { | |
84 | seq_printf(m, "type : hash\n"); | |
85 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
86 | seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize); | |
87 | } | |
88 | ||
89 | const struct crypto_type crypto_hash_type = { | |
90 | .ctxsize = crypto_hash_ctxsize, | |
91 | .init = crypto_init_hash_ops, | |
92 | #ifdef CONFIG_PROC_FS | |
93 | .show = crypto_hash_show, | |
94 | #endif | |
95 | }; | |
96 | EXPORT_SYMBOL_GPL(crypto_hash_type); | |
97 | ||
98 | MODULE_LICENSE("GPL"); | |
99 | MODULE_DESCRIPTION("Generic cryptographic hash type"); |