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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 | |
21 | struct crypto_ecb_ctx { |
22 | struct crypto_cipher *child; |
23 | }; |
24 | |
25 | static 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 | |
41 | static 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 | |
69 | static 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 | |
83 | static 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 | |
97 | static 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 | struct crypto_cipher *cipher; |
103 | |
104 | cipher = crypto_spawn_cipher(spawn); |
105 | if (IS_ERR(cipher)) |
106 | return PTR_ERR(cipher); |
107 | |
108 | ctx->child = cipher; |
109 | return 0; |
110 | } |
111 | |
112 | static void crypto_ecb_exit_tfm(struct crypto_tfm *tfm) |
113 | { |
114 | struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm); |
115 | crypto_free_cipher(ctx->child); |
116 | } |
117 | |
118 | static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb) |
119 | { |
120 | struct crypto_instance *inst; |
121 | struct crypto_alg *alg; |
122 | int err; |
123 | |
124 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); |
125 | if (err) |
126 | return ERR_PTR(err); |
127 | |
128 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, |
129 | CRYPTO_ALG_TYPE_MASK); |
130 | if (IS_ERR(alg)) |
131 | return ERR_CAST(alg); |
132 | |
133 | inst = crypto_alloc_instance("ecb", alg); |
134 | if (IS_ERR(inst)) |
135 | goto out_put_alg; |
136 | |
137 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER; |
138 | inst->alg.cra_priority = alg->cra_priority; |
139 | inst->alg.cra_blocksize = alg->cra_blocksize; |
140 | inst->alg.cra_alignmask = alg->cra_alignmask; |
141 | inst->alg.cra_type = &crypto_blkcipher_type; |
142 | |
143 | inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize; |
144 | inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize; |
145 | |
146 | inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx); |
147 | |
148 | inst->alg.cra_init = crypto_ecb_init_tfm; |
149 | inst->alg.cra_exit = crypto_ecb_exit_tfm; |
150 | |
151 | inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey; |
152 | inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt; |
153 | inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt; |
154 | |
155 | out_put_alg: |
156 | crypto_mod_put(alg); |
157 | return inst; |
158 | } |
159 | |
160 | static void crypto_ecb_free(struct crypto_instance *inst) |
161 | { |
162 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
163 | kfree(inst); |
164 | } |
165 | |
166 | static struct crypto_template crypto_ecb_tmpl = { |
167 | .name = "ecb", |
168 | .alloc = crypto_ecb_alloc, |
169 | .free = crypto_ecb_free, |
170 | .module = THIS_MODULE, |
171 | }; |
172 | |
173 | static int __init crypto_ecb_module_init(void) |
174 | { |
175 | return crypto_register_template(&crypto_ecb_tmpl); |
176 | } |
177 | |
178 | static void __exit crypto_ecb_module_exit(void) |
179 | { |
180 | crypto_unregister_template(&crypto_ecb_tmpl); |
181 | } |
182 | |
183 | module_init(crypto_ecb_module_init); |
184 | module_exit(crypto_ecb_module_exit); |
185 | |
186 | MODULE_LICENSE("GPL"); |
187 | MODULE_DESCRIPTION("ECB block cipher algorithm"); |
188 |
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