Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Asynchronous block chaining cipher operations.
3 *
4 * This is the asynchronous version of blkcipher.c indicating completion
5 * via a callback.
6 *
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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
16#include <crypto/algapi.h>
17#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/seq_file.h>
23
24static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
25 unsigned int keylen)
26{
27 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
28 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
29 int ret;
30 u8 *buffer, *alignbuffer;
31 unsigned long absize;
32
33 absize = keylen + alignmask;
34 buffer = kmalloc(absize, GFP_ATOMIC);
35 if (!buffer)
36 return -ENOMEM;
37
38 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
39 memcpy(alignbuffer, key, keylen);
40 ret = cipher->setkey(tfm, alignbuffer, keylen);
41 memset(alignbuffer, 0, keylen);
42 kfree(buffer);
43 return ret;
44}
45
46static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
47 unsigned int keylen)
48{
49 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
50 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
51
52 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
53 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
54 return -EINVAL;
55 }
56
57 if ((unsigned long)key & alignmask)
58 return setkey_unaligned(tfm, key, keylen);
59
60 return cipher->setkey(tfm, key, keylen);
61}
62
63static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
64 u32 mask)
65{
66 return alg->cra_ctxsize;
67}
68
69static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
70 u32 mask)
71{
72 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
73 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
74
75 if (alg->ivsize > PAGE_SIZE / 8)
76 return -EINVAL;
77
78 crt->setkey = setkey;
79 crt->encrypt = alg->encrypt;
80 crt->decrypt = alg->decrypt;
81 crt->ivsize = alg->ivsize;
82
83 return 0;
84}
85
86static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
87 __attribute__ ((unused));
88static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
89{
90 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
91
92 seq_printf(m, "type : ablkcipher\n");
93 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
94 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
95 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
96 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
97}
98
99const struct crypto_type crypto_ablkcipher_type = {
100 .ctxsize = crypto_ablkcipher_ctxsize,
101 .init = crypto_init_ablkcipher_ops,
102#ifdef CONFIG_PROC_FS
103 .show = crypto_ablkcipher_show,
104#endif
105};
106EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
107
108MODULE_LICENSE("GPL");
109MODULE_DESCRIPTION("Asynchronous block chaining cipher type");