OpenCores
URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [crypto/] [hash.c] - Blame information for rev 62

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 62 marcus.erl
/*
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>
15
#include <linux/slab.h>
16
#include <linux/seq_file.h>
17
 
18
#include "internal.h"
19
 
20
static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
21
                                        u32 mask)
22
{
23
        return alg->cra_ctxsize;
24
}
25
 
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);
44
        memset(alignbuffer, 0, keylen);
45
        kfree(buffer);
46
        return ret;
47
}
48
 
49
static int hash_setkey(struct crypto_hash *crt, const u8 *key,
50
                       unsigned int keylen)
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
 
62
static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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;
74
        crt->setkey = hash_setkey;
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)
81
        __attribute__ ((unused));
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");

powered by: WebSVN 2.1.0

© copyright 1999-2025 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.