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-rw-r--r--crypto/ecb.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/crypto/ecb.c b/crypto/ecb.c
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1/*
2 * ECB: Electronic CodeBook mode
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
13#include <crypto/algapi.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/scatterlist.h>
19#include <linux/slab.h>
20
21struct crypto_ecb_ctx {
22 struct crypto_cipher *child;
23};
24
25static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key,
26 unsigned int keylen)
27{
28 struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(parent);
29 struct crypto_cipher *child = ctx->child;
30 int err;
31
32 crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
33 crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
34 CRYPTO_TFM_REQ_MASK);
35 err = crypto_cipher_setkey(child, key, keylen);
36 crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
37 CRYPTO_TFM_RES_MASK);
38 return err;
39}
40
41static int crypto_ecb_crypt(struct blkcipher_desc *desc,
42 struct blkcipher_walk *walk,
43 struct crypto_cipher *tfm,
44 void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
45{
46 int bsize = crypto_cipher_blocksize(tfm);
47 unsigned int nbytes;
48 int err;
49
50 err = blkcipher_walk_virt(desc, walk);
51
52 while ((nbytes = walk->nbytes)) {
53 u8 *wsrc = walk->src.virt.addr;
54 u8 *wdst = walk->dst.virt.addr;
55
56 do {
57 fn(crypto_cipher_tfm(tfm), wdst, wsrc);
58
59 wsrc += bsize;
60 wdst += bsize;
61 } while ((nbytes -= bsize) >= bsize);
62
63 err = blkcipher_walk_done(desc, walk, nbytes);
64 }
65
66 return err;
67}
68
69static int crypto_ecb_encrypt(struct blkcipher_desc *desc,
70 struct scatterlist *dst, struct scatterlist *src,
71 unsigned int nbytes)
72{
73 struct blkcipher_walk walk;
74 struct crypto_blkcipher *tfm = desc->tfm;
75 struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
76 struct crypto_cipher *child = ctx->child;
77
78 blkcipher_walk_init(&walk, dst, src, nbytes);
79 return crypto_ecb_crypt(desc, &walk, child,
80 crypto_cipher_alg(child)->cia_encrypt);
81}
82
83static int crypto_ecb_decrypt(struct blkcipher_desc *desc,
84 struct scatterlist *dst, struct scatterlist *src,
85 unsigned int nbytes)
86{
87 struct blkcipher_walk walk;
88 struct crypto_blkcipher *tfm = desc->tfm;
89 struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
90 struct crypto_cipher *child = ctx->child;
91
92 blkcipher_walk_init(&walk, dst, src, nbytes);
93 return crypto_ecb_crypt(desc, &walk, child,
94 crypto_cipher_alg(child)->cia_decrypt);
95}
96
97static int crypto_ecb_init_tfm(struct crypto_tfm *tfm)
98{
99 struct crypto_instance *inst = (void *)tfm->__crt_alg;
100 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
101 struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
102
103 tfm = crypto_spawn_tfm(spawn);
104 if (IS_ERR(tfm))
105 return PTR_ERR(tfm);
106
107 ctx->child = crypto_cipher_cast(tfm);
108 return 0;
109}
110
111static void crypto_ecb_exit_tfm(struct crypto_tfm *tfm)
112{
113 struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
114 crypto_free_cipher(ctx->child);
115}
116
117static struct crypto_instance *crypto_ecb_alloc(void *param, unsigned int len)
118{
119 struct crypto_instance *inst;
120 struct crypto_alg *alg;
121
122 alg = crypto_get_attr_alg(param, len, CRYPTO_ALG_TYPE_CIPHER,
123 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
124 if (IS_ERR(alg))
125 return ERR_PTR(PTR_ERR(alg));
126
127 inst = crypto_alloc_instance("ecb", alg);
128 if (IS_ERR(inst))
129 goto out_put_alg;
130
131 inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
132 inst->alg.cra_priority = alg->cra_priority;
133 inst->alg.cra_blocksize = alg->cra_blocksize;
134 inst->alg.cra_alignmask = alg->cra_alignmask;
135 inst->alg.cra_type = &crypto_blkcipher_type;
136
137 inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
138 inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
139
140 inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx);
141
142 inst->alg.cra_init = crypto_ecb_init_tfm;
143 inst->alg.cra_exit = crypto_ecb_exit_tfm;
144
145 inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey;
146 inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt;
147 inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt;
148
149out_put_alg:
150 crypto_mod_put(alg);
151 return inst;
152}
153
154static void crypto_ecb_free(struct crypto_instance *inst)
155{
156 crypto_drop_spawn(crypto_instance_ctx(inst));
157 kfree(inst);
158}
159
160static struct crypto_template crypto_ecb_tmpl = {
161 .name = "ecb",
162 .alloc = crypto_ecb_alloc,
163 .free = crypto_ecb_free,
164 .module = THIS_MODULE,
165};
166
167static int __init crypto_ecb_module_init(void)
168{
169 return crypto_register_template(&crypto_ecb_tmpl);
170}
171
172static void __exit crypto_ecb_module_exit(void)
173{
174 crypto_unregister_template(&crypto_ecb_tmpl);
175}
176
177module_init(crypto_ecb_module_init);
178module_exit(crypto_ecb_module_exit);
179
180MODULE_LICENSE("GPL");
181MODULE_DESCRIPTION("ECB block cipher algorithm");
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