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b5b7f088 HX |
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/module.h> | |
20 | #include <linux/seq_file.h> | |
21 | ||
22 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, | |
23 | unsigned int keylen) | |
24 | { | |
25 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
26 | ||
27 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
28 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
29 | return -EINVAL; | |
30 | } | |
31 | ||
32 | return cipher->setkey(tfm, key, keylen); | |
33 | } | |
34 | ||
35 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, | |
36 | u32 mask) | |
37 | { | |
38 | return alg->cra_ctxsize; | |
39 | } | |
40 | ||
41 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, | |
42 | u32 mask) | |
43 | { | |
44 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
45 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
46 | ||
47 | if (alg->ivsize > PAGE_SIZE / 8) | |
48 | return -EINVAL; | |
49 | ||
50 | crt->setkey = setkey; | |
51 | crt->encrypt = alg->encrypt; | |
52 | crt->decrypt = alg->decrypt; | |
53 | crt->ivsize = alg->ivsize; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
59 | __attribute__ ((unused)); | |
60 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
61 | { | |
62 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
63 | ||
64 | seq_printf(m, "type : ablkcipher\n"); | |
65 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
66 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
67 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
68 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
69 | seq_printf(m, "qlen : %u\n", ablkcipher->queue->qlen); | |
70 | seq_printf(m, "max qlen : %u\n", ablkcipher->queue->max_qlen); | |
71 | } | |
72 | ||
73 | const struct crypto_type crypto_ablkcipher_type = { | |
74 | .ctxsize = crypto_ablkcipher_ctxsize, | |
75 | .init = crypto_init_ablkcipher_ops, | |
76 | #ifdef CONFIG_PROC_FS | |
77 | .show = crypto_ablkcipher_show, | |
78 | #endif | |
79 | }; | |
80 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); | |
81 | ||
82 | MODULE_LICENSE("GPL"); | |
83 | MODULE_DESCRIPTION("Asynchronous block chaining cipher type"); |