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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 | ||
378f4f51 HX |
16 | #include <crypto/internal/skcipher.h> |
17 | #include <linux/err.h> | |
b5b7f088 | 18 | #include <linux/init.h> |
791b4d5f | 19 | #include <linux/kernel.h> |
b5b7f088 | 20 | #include <linux/module.h> |
791b4d5f | 21 | #include <linux/slab.h> |
b5b7f088 HX |
22 | #include <linux/seq_file.h> |
23 | ||
378f4f51 HX |
24 | #include "internal.h" |
25 | ||
791b4d5f HX |
26 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, |
27 | unsigned int keylen) | |
ca7c3938 SS |
28 | { |
29 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
30 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); | |
31 | int ret; | |
32 | u8 *buffer, *alignbuffer; | |
33 | unsigned long absize; | |
34 | ||
35 | absize = keylen + alignmask; | |
36 | buffer = kmalloc(absize, GFP_ATOMIC); | |
37 | if (!buffer) | |
38 | return -ENOMEM; | |
39 | ||
40 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
41 | memcpy(alignbuffer, key, keylen); | |
42 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 43 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
44 | kfree(buffer); |
45 | return ret; | |
46 | } | |
47 | ||
b5b7f088 HX |
48 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
49 | unsigned int keylen) | |
50 | { | |
51 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
ca7c3938 | 52 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
b5b7f088 HX |
53 | |
54 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
55 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
56 | return -EINVAL; | |
57 | } | |
58 | ||
ca7c3938 SS |
59 | if ((unsigned long)key & alignmask) |
60 | return setkey_unaligned(tfm, key, keylen); | |
61 | ||
b5b7f088 HX |
62 | return cipher->setkey(tfm, key, keylen); |
63 | } | |
64 | ||
65 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, | |
66 | u32 mask) | |
67 | { | |
68 | return alg->cra_ctxsize; | |
69 | } | |
70 | ||
71 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, | |
72 | u32 mask) | |
73 | { | |
74 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
75 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
76 | ||
77 | if (alg->ivsize > PAGE_SIZE / 8) | |
78 | return -EINVAL; | |
79 | ||
80 | crt->setkey = setkey; | |
81 | crt->encrypt = alg->encrypt; | |
82 | crt->decrypt = alg->decrypt; | |
83 | crt->ivsize = alg->ivsize; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
89 | __attribute__ ((unused)); | |
90 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
91 | { | |
92 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
93 | ||
94 | seq_printf(m, "type : ablkcipher\n"); | |
95 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
96 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
97 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
98 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
b5b7f088 HX |
99 | } |
100 | ||
101 | const struct crypto_type crypto_ablkcipher_type = { | |
102 | .ctxsize = crypto_ablkcipher_ctxsize, | |
103 | .init = crypto_init_ablkcipher_ops, | |
104 | #ifdef CONFIG_PROC_FS | |
105 | .show = crypto_ablkcipher_show, | |
106 | #endif | |
107 | }; | |
108 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); | |
109 | ||
61da88e2 HX |
110 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) |
111 | { | |
112 | return -ENOSYS; | |
113 | } | |
114 | ||
115 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, | |
116 | u32 mask) | |
117 | { | |
118 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
119 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
120 | ||
121 | if (alg->ivsize > PAGE_SIZE / 8) | |
122 | return -EINVAL; | |
123 | ||
124 | crt->setkey = setkey; | |
125 | crt->encrypt = alg->encrypt; | |
126 | crt->decrypt = alg->decrypt; | |
127 | crt->givencrypt = alg->givencrypt; | |
128 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; | |
129 | crt->ivsize = alg->ivsize; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
135 | __attribute__ ((unused)); | |
136 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
137 | { | |
138 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
139 | ||
140 | seq_printf(m, "type : givcipher\n"); | |
141 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
142 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
143 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
144 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
145 | } | |
146 | ||
147 | const struct crypto_type crypto_givcipher_type = { | |
148 | .ctxsize = crypto_ablkcipher_ctxsize, | |
149 | .init = crypto_init_givcipher_ops, | |
150 | #ifdef CONFIG_PROC_FS | |
151 | .show = crypto_givcipher_show, | |
152 | #endif | |
153 | }; | |
154 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); | |
155 | ||
378f4f51 HX |
156 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, |
157 | u32 type, u32 mask) | |
158 | { | |
159 | struct crypto_alg *alg; | |
160 | int err; | |
161 | ||
162 | type = crypto_skcipher_type(type); | |
163 | mask = crypto_skcipher_mask(mask); | |
164 | ||
165 | alg = crypto_alg_mod_lookup(name, type, mask); | |
166 | if (IS_ERR(alg)) | |
167 | return PTR_ERR(alg); | |
168 | ||
169 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
170 | crypto_mod_put(alg); | |
171 | return err; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); | |
174 | ||
b5b7f088 HX |
175 | MODULE_LICENSE("GPL"); |
176 | MODULE_DESCRIPTION("Asynchronous block chaining cipher type"); |