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1 | /* |
2 | * Copyright (C)2006 USAGI/WIDE Project |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | * |
18 | * Author: |
19 | * Kazunori Miyazawa <miyazawa@linux-ipv6.org> |
20 | */ |
21 | |
22 | #include <crypto/internal/hash.h> |
23 | #include <linux/err.h> |
24 | #include <linux/kernel.h> |
25 | |
26 | static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101, |
27 | 0x02020202, 0x02020202, 0x02020202, 0x02020202, |
28 | 0x03030303, 0x03030303, 0x03030303, 0x03030303}; |
29 | |
30 | /* |
31 | * +------------------------ |
32 | * | <parent tfm> |
33 | * +------------------------ |
34 | * | xcbc_tfm_ctx |
35 | * +------------------------ |
36 | * | consts (block size * 2) |
37 | * +------------------------ |
38 | */ |
39 | struct xcbc_tfm_ctx { |
40 | struct crypto_cipher *child; |
41 | u8 ctx[]; |
42 | }; |
43 | |
44 | /* |
45 | * +------------------------ |
46 | * | <shash desc> |
47 | * +------------------------ |
48 | * | xcbc_desc_ctx |
49 | * +------------------------ |
50 | * | odds (block size) |
51 | * +------------------------ |
52 | * | prev (block size) |
53 | * +------------------------ |
54 | */ |
55 | struct xcbc_desc_ctx { |
56 | unsigned int len; |
57 | u8 ctx[]; |
58 | }; |
59 | |
60 | static int crypto_xcbc_digest_setkey(struct crypto_shash *parent, |
61 | const u8 *inkey, unsigned int keylen) |
62 | { |
63 | unsigned long alignmask = crypto_shash_alignmask(parent); |
64 | struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent); |
65 | int bs = crypto_shash_blocksize(parent); |
66 | u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
67 | int err = 0; |
68 | u8 key1[bs]; |
69 | |
70 | if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen))) |
71 | return err; |
72 | |
73 | crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs); |
74 | crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2); |
75 | crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks); |
76 | |
77 | return crypto_cipher_setkey(ctx->child, key1, bs); |
78 | |
79 | } |
80 | |
81 | static int crypto_xcbc_digest_init(struct shash_desc *pdesc) |
82 | { |
83 | unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm); |
84 | struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
85 | int bs = crypto_shash_blocksize(pdesc->tfm); |
86 | u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs; |
87 | |
88 | ctx->len = 0; |
89 | memset(prev, 0, bs); |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p, |
95 | unsigned int len) |
96 | { |
97 | struct crypto_shash *parent = pdesc->tfm; |
98 | unsigned long alignmask = crypto_shash_alignmask(parent); |
99 | struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); |
100 | struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
101 | struct crypto_cipher *tfm = tctx->child; |
102 | int bs = crypto_shash_blocksize(parent); |
103 | u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
104 | u8 *prev = odds + bs; |
105 | |
106 | /* checking the data can fill the block */ |
107 | if ((ctx->len + len) <= bs) { |
108 | memcpy(odds + ctx->len, p, len); |
109 | ctx->len += len; |
110 | return 0; |
111 | } |
112 | |
113 | /* filling odds with new data and encrypting it */ |
114 | memcpy(odds + ctx->len, p, bs - ctx->len); |
115 | len -= bs - ctx->len; |
116 | p += bs - ctx->len; |
117 | |
118 | crypto_xor(prev, odds, bs); |
119 | crypto_cipher_encrypt_one(tfm, prev, prev); |
120 | |
121 | /* clearing the length */ |
122 | ctx->len = 0; |
123 | |
124 | /* encrypting the rest of data */ |
125 | while (len > bs) { |
126 | crypto_xor(prev, p, bs); |
127 | crypto_cipher_encrypt_one(tfm, prev, prev); |
128 | p += bs; |
129 | len -= bs; |
130 | } |
131 | |
132 | /* keeping the surplus of blocksize */ |
133 | if (len) { |
134 | memcpy(odds, p, len); |
135 | ctx->len = len; |
136 | } |
137 | |
138 | return 0; |
139 | } |
140 | |
141 | static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out) |
142 | { |
143 | struct crypto_shash *parent = pdesc->tfm; |
144 | unsigned long alignmask = crypto_shash_alignmask(parent); |
145 | struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); |
146 | struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
147 | struct crypto_cipher *tfm = tctx->child; |
148 | int bs = crypto_shash_blocksize(parent); |
149 | u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1); |
150 | u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
151 | u8 *prev = odds + bs; |
152 | unsigned int offset = 0; |
153 | |
154 | if (ctx->len != bs) { |
155 | unsigned int rlen; |
156 | u8 *p = odds + ctx->len; |
157 | |
158 | *p = 0x80; |
159 | p++; |
160 | |
161 | rlen = bs - ctx->len -1; |
162 | if (rlen) |
163 | memset(p, 0, rlen); |
164 | |
165 | offset += bs; |
166 | } |
167 | |
168 | crypto_xor(prev, odds, bs); |
169 | crypto_xor(prev, consts + offset, bs); |
170 | |
171 | crypto_cipher_encrypt_one(tfm, out, prev); |
172 | |
173 | return 0; |
174 | } |
175 | |
176 | static int xcbc_init_tfm(struct crypto_tfm *tfm) |
177 | { |
178 | struct crypto_cipher *cipher; |
179 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
180 | struct crypto_spawn *spawn = crypto_instance_ctx(inst); |
181 | struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
182 | |
183 | cipher = crypto_spawn_cipher(spawn); |
184 | if (IS_ERR(cipher)) |
185 | return PTR_ERR(cipher); |
186 | |
187 | ctx->child = cipher; |
188 | |
189 | return 0; |
190 | }; |
191 | |
192 | static void xcbc_exit_tfm(struct crypto_tfm *tfm) |
193 | { |
194 | struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
195 | crypto_free_cipher(ctx->child); |
196 | } |
197 | |
198 | static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb) |
199 | { |
200 | struct shash_instance *inst; |
201 | struct crypto_alg *alg; |
202 | unsigned long alignmask; |
203 | int err; |
204 | |
205 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); |
206 | if (err) |
207 | return err; |
208 | |
209 | alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, |
210 | CRYPTO_ALG_TYPE_MASK); |
211 | if (IS_ERR(alg)) |
212 | return PTR_ERR(alg); |
213 | |
214 | switch(alg->cra_blocksize) { |
215 | case 16: |
216 | break; |
217 | default: |
218 | goto out_put_alg; |
219 | } |
220 | |
221 | inst = shash_alloc_instance("xcbc", alg); |
222 | err = PTR_ERR(inst); |
223 | if (IS_ERR(inst)) |
224 | goto out_put_alg; |
225 | |
226 | err = crypto_init_spawn(shash_instance_ctx(inst), alg, |
227 | shash_crypto_instance(inst), |
228 | CRYPTO_ALG_TYPE_MASK); |
229 | if (err) |
230 | goto out_free_inst; |
231 | |
232 | alignmask = alg->cra_alignmask | 3; |
233 | inst->alg.base.cra_alignmask = alignmask; |
234 | inst->alg.base.cra_priority = alg->cra_priority; |
235 | inst->alg.base.cra_blocksize = alg->cra_blocksize; |
236 | |
237 | inst->alg.digestsize = alg->cra_blocksize; |
238 | inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx), |
239 | crypto_tfm_ctx_alignment()) + |
240 | (alignmask & |
241 | ~(crypto_tfm_ctx_alignment() - 1)) + |
242 | alg->cra_blocksize * 2; |
243 | |
244 | inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx), |
245 | alignmask + 1) + |
246 | alg->cra_blocksize * 2; |
247 | inst->alg.base.cra_init = xcbc_init_tfm; |
248 | inst->alg.base.cra_exit = xcbc_exit_tfm; |
249 | |
250 | inst->alg.init = crypto_xcbc_digest_init; |
251 | inst->alg.update = crypto_xcbc_digest_update; |
252 | inst->alg.final = crypto_xcbc_digest_final; |
253 | inst->alg.setkey = crypto_xcbc_digest_setkey; |
254 | |
255 | err = shash_register_instance(tmpl, inst); |
256 | if (err) { |
257 | out_free_inst: |
258 | shash_free_instance(shash_crypto_instance(inst)); |
259 | } |
260 | |
261 | out_put_alg: |
262 | crypto_mod_put(alg); |
263 | return err; |
264 | } |
265 | |
266 | static struct crypto_template crypto_xcbc_tmpl = { |
267 | .name = "xcbc", |
268 | .create = xcbc_create, |
269 | .free = shash_free_instance, |
270 | .module = THIS_MODULE, |
271 | }; |
272 | |
273 | static int __init crypto_xcbc_module_init(void) |
274 | { |
275 | return crypto_register_template(&crypto_xcbc_tmpl); |
276 | } |
277 | |
278 | static void __exit crypto_xcbc_module_exit(void) |
279 | { |
280 | crypto_unregister_template(&crypto_xcbc_tmpl); |
281 | } |
282 | |
283 | module_init(crypto_xcbc_module_init); |
284 | module_exit(crypto_xcbc_module_exit); |
285 | |
286 | MODULE_LICENSE("GPL"); |
287 | MODULE_DESCRIPTION("XCBC keyed hash algorithm"); |
288 |
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