Root/crypto/ecb.c

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    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
112static 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
118static 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
155out_put_alg:
156    crypto_mod_put(alg);
157    return inst;
158}
159
160static void crypto_ecb_free(struct crypto_instance *inst)
161{
162    crypto_drop_spawn(crypto_instance_ctx(inst));
163    kfree(inst);
164}
165
166static 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
173static int __init crypto_ecb_module_init(void)
174{
175    return crypto_register_template(&crypto_ecb_tmpl);
176}
177
178static void __exit crypto_ecb_module_exit(void)
179{
180    crypto_unregister_template(&crypto_ecb_tmpl);
181}
182
183module_init(crypto_ecb_module_init);
184module_exit(crypto_ecb_module_exit);
185
186MODULE_LICENSE("GPL");
187MODULE_DESCRIPTION("ECB block cipher algorithm");
188

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