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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#include <linux/module.h>
26
27static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
28 0x02020202, 0x02020202, 0x02020202, 0x02020202,
29 0x03030303, 0x03030303, 0x03030303, 0x03030303};
30
31/*
32 * +------------------------
33 * | <parent tfm>
34 * +------------------------
35 * | xcbc_tfm_ctx
36 * +------------------------
37 * | consts (block size * 2)
38 * +------------------------
39 */
40struct xcbc_tfm_ctx {
41 struct crypto_cipher *child;
42 u8 ctx[];
43};
44
45/*
46 * +------------------------
47 * | <shash desc>
48 * +------------------------
49 * | xcbc_desc_ctx
50 * +------------------------
51 * | odds (block size)
52 * +------------------------
53 * | prev (block size)
54 * +------------------------
55 */
56struct xcbc_desc_ctx {
57 unsigned int len;
58 u8 ctx[];
59};
60
61static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
62 const u8 *inkey, unsigned int keylen)
63{
64 unsigned long alignmask = crypto_shash_alignmask(parent);
65 struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
66 int bs = crypto_shash_blocksize(parent);
67 u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
68 int err = 0;
69 u8 key1[bs];
70
71 if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
72 return err;
73
74 crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
75 crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
76 crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
77
78 return crypto_cipher_setkey(ctx->child, key1, bs);
79
80}
81
82static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
83{
84 unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm);
85 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
86 int bs = crypto_shash_blocksize(pdesc->tfm);
87 u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs;
88
89 ctx->len = 0;
90 memset(prev, 0, bs);
91
92 return 0;
93}
94
95static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
96 unsigned int len)
97{
98 struct crypto_shash *parent = pdesc->tfm;
99 unsigned long alignmask = crypto_shash_alignmask(parent);
100 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
101 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
102 struct crypto_cipher *tfm = tctx->child;
103 int bs = crypto_shash_blocksize(parent);
104 u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
105 u8 *prev = odds + bs;
106
107 /* checking the data can fill the block */
108 if ((ctx->len + len) <= bs) {
109 memcpy(odds + ctx->len, p, len);
110 ctx->len += len;
111 return 0;
112 }
113
114 /* filling odds with new data and encrypting it */
115 memcpy(odds + ctx->len, p, bs - ctx->len);
116 len -= bs - ctx->len;
117 p += bs - ctx->len;
118
119 crypto_xor(prev, odds, bs);
120 crypto_cipher_encrypt_one(tfm, prev, prev);
121
122 /* clearing the length */
123 ctx->len = 0;
124
125 /* encrypting the rest of data */
126 while (len > bs) {
127 crypto_xor(prev, p, bs);
128 crypto_cipher_encrypt_one(tfm, prev, prev);
129 p += bs;
130 len -= bs;
131 }
132
133 /* keeping the surplus of blocksize */
134 if (len) {
135 memcpy(odds, p, len);
136 ctx->len = len;
137 }
138
139 return 0;
140}
141
142static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
143{
144 struct crypto_shash *parent = pdesc->tfm;
145 unsigned long alignmask = crypto_shash_alignmask(parent);
146 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
147 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
148 struct crypto_cipher *tfm = tctx->child;
149 int bs = crypto_shash_blocksize(parent);
150 u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1);
151 u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
152 u8 *prev = odds + bs;
153 unsigned int offset = 0;
154
155 if (ctx->len != bs) {
156 unsigned int rlen;
157 u8 *p = odds + ctx->len;
158
159 *p = 0x80;
160 p++;
161
162 rlen = bs - ctx->len -1;
163 if (rlen)
164 memset(p, 0, rlen);
165
166 offset += bs;
167 }
168
169 crypto_xor(prev, odds, bs);
170 crypto_xor(prev, consts + offset, bs);
171
172 crypto_cipher_encrypt_one(tfm, out, prev);
173
174 return 0;
175}
176
177static int xcbc_init_tfm(struct crypto_tfm *tfm)
178{
179 struct crypto_cipher *cipher;
180 struct crypto_instance *inst = (void *)tfm->__crt_alg;
181 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
182 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
183
184 cipher = crypto_spawn_cipher(spawn);
185 if (IS_ERR(cipher))
186 return PTR_ERR(cipher);
187
188 ctx->child = cipher;
189
190 return 0;
191};
192
193static void xcbc_exit_tfm(struct crypto_tfm *tfm)
194{
195 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
196 crypto_free_cipher(ctx->child);
197}
198
199static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
200{
201 struct shash_instance *inst;
202 struct crypto_alg *alg;
203 unsigned long alignmask;
204 int err;
205
206 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
207 if (err)
208 return err;
209
210 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
211 CRYPTO_ALG_TYPE_MASK);
212 if (IS_ERR(alg))
213 return PTR_ERR(alg);
214
215 switch(alg->cra_blocksize) {
216 case 16:
217 break;
218 default:
219 goto out_put_alg;
220 }
221
222 inst = shash_alloc_instance("xcbc", alg);
223 err = PTR_ERR(inst);
224 if (IS_ERR(inst))
225 goto out_put_alg;
226
227 err = crypto_init_spawn(shash_instance_ctx(inst), alg,
228 shash_crypto_instance(inst),
229 CRYPTO_ALG_TYPE_MASK);
230 if (err)
231 goto out_free_inst;
232
233 alignmask = alg->cra_alignmask | 3;
234 inst->alg.base.cra_alignmask = alignmask;
235 inst->alg.base.cra_priority = alg->cra_priority;
236 inst->alg.base.cra_blocksize = alg->cra_blocksize;
237
238 inst->alg.digestsize = alg->cra_blocksize;
239 inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx),
240 crypto_tfm_ctx_alignment()) +
241 (alignmask &
242 ~(crypto_tfm_ctx_alignment() - 1)) +
243 alg->cra_blocksize * 2;
244
245 inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx),
246 alignmask + 1) +
247 alg->cra_blocksize * 2;
248 inst->alg.base.cra_init = xcbc_init_tfm;
249 inst->alg.base.cra_exit = xcbc_exit_tfm;
250
251 inst->alg.init = crypto_xcbc_digest_init;
252 inst->alg.update = crypto_xcbc_digest_update;
253 inst->alg.final = crypto_xcbc_digest_final;
254 inst->alg.setkey = crypto_xcbc_digest_setkey;
255
256 err = shash_register_instance(tmpl, inst);
257 if (err) {
258out_free_inst:
259 shash_free_instance(shash_crypto_instance(inst));
260 }
261
262out_put_alg:
263 crypto_mod_put(alg);
264 return err;
265}
266
267static struct crypto_template crypto_xcbc_tmpl = {
268 .name = "xcbc",
269 .create = xcbc_create,
270 .free = shash_free_instance,
271 .module = THIS_MODULE,
272};
273
274static int __init crypto_xcbc_module_init(void)
275{
276 return crypto_register_template(&crypto_xcbc_tmpl);
277}
278
279static void __exit crypto_xcbc_module_exit(void)
280{
281 crypto_unregister_template(&crypto_xcbc_tmpl);
282}
283
284module_init(crypto_xcbc_module_init);
285module_exit(crypto_xcbc_module_exit);
286
287MODULE_LICENSE("GPL");
288MODULE_DESCRIPTION("XCBC keyed hash algorithm");
289MODULE_ALIAS_CRYPTO("xcbc");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C)2006 USAGI/WIDE Project
4 *
5 * Author:
6 * Kazunori Miyazawa <miyazawa@linux-ipv6.org>
7 */
8
9#include <crypto/internal/cipher.h>
10#include <crypto/internal/hash.h>
11#include <linux/err.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14
15static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
16 0x02020202, 0x02020202, 0x02020202, 0x02020202,
17 0x03030303, 0x03030303, 0x03030303, 0x03030303};
18
19/*
20 * +------------------------
21 * | <parent tfm>
22 * +------------------------
23 * | xcbc_tfm_ctx
24 * +------------------------
25 * | consts (block size * 2)
26 * +------------------------
27 */
28struct xcbc_tfm_ctx {
29 struct crypto_cipher *child;
30 u8 ctx[];
31};
32
33/*
34 * +------------------------
35 * | <shash desc>
36 * +------------------------
37 * | xcbc_desc_ctx
38 * +------------------------
39 * | odds (block size)
40 * +------------------------
41 * | prev (block size)
42 * +------------------------
43 */
44struct xcbc_desc_ctx {
45 unsigned int len;
46 u8 ctx[];
47};
48
49#define XCBC_BLOCKSIZE 16
50
51static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
52 const u8 *inkey, unsigned int keylen)
53{
54 unsigned long alignmask = crypto_shash_alignmask(parent);
55 struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
56 u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
57 int err = 0;
58 u8 key1[XCBC_BLOCKSIZE];
59 int bs = sizeof(key1);
60
61 if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
62 return err;
63
64 crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
65 crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
66 crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
67
68 return crypto_cipher_setkey(ctx->child, key1, bs);
69
70}
71
72static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
73{
74 unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm);
75 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
76 int bs = crypto_shash_blocksize(pdesc->tfm);
77 u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs;
78
79 ctx->len = 0;
80 memset(prev, 0, bs);
81
82 return 0;
83}
84
85static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
86 unsigned int len)
87{
88 struct crypto_shash *parent = pdesc->tfm;
89 unsigned long alignmask = crypto_shash_alignmask(parent);
90 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
91 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
92 struct crypto_cipher *tfm = tctx->child;
93 int bs = crypto_shash_blocksize(parent);
94 u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
95 u8 *prev = odds + bs;
96
97 /* checking the data can fill the block */
98 if ((ctx->len + len) <= bs) {
99 memcpy(odds + ctx->len, p, len);
100 ctx->len += len;
101 return 0;
102 }
103
104 /* filling odds with new data and encrypting it */
105 memcpy(odds + ctx->len, p, bs - ctx->len);
106 len -= bs - ctx->len;
107 p += bs - ctx->len;
108
109 crypto_xor(prev, odds, bs);
110 crypto_cipher_encrypt_one(tfm, prev, prev);
111
112 /* clearing the length */
113 ctx->len = 0;
114
115 /* encrypting the rest of data */
116 while (len > bs) {
117 crypto_xor(prev, p, bs);
118 crypto_cipher_encrypt_one(tfm, prev, prev);
119 p += bs;
120 len -= bs;
121 }
122
123 /* keeping the surplus of blocksize */
124 if (len) {
125 memcpy(odds, p, len);
126 ctx->len = len;
127 }
128
129 return 0;
130}
131
132static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
133{
134 struct crypto_shash *parent = pdesc->tfm;
135 unsigned long alignmask = crypto_shash_alignmask(parent);
136 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
137 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
138 struct crypto_cipher *tfm = tctx->child;
139 int bs = crypto_shash_blocksize(parent);
140 u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1);
141 u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
142 u8 *prev = odds + bs;
143 unsigned int offset = 0;
144
145 if (ctx->len != bs) {
146 unsigned int rlen;
147 u8 *p = odds + ctx->len;
148
149 *p = 0x80;
150 p++;
151
152 rlen = bs - ctx->len -1;
153 if (rlen)
154 memset(p, 0, rlen);
155
156 offset += bs;
157 }
158
159 crypto_xor(prev, odds, bs);
160 crypto_xor(prev, consts + offset, bs);
161
162 crypto_cipher_encrypt_one(tfm, out, prev);
163
164 return 0;
165}
166
167static int xcbc_init_tfm(struct crypto_tfm *tfm)
168{
169 struct crypto_cipher *cipher;
170 struct crypto_instance *inst = (void *)tfm->__crt_alg;
171 struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
172 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
173
174 cipher = crypto_spawn_cipher(spawn);
175 if (IS_ERR(cipher))
176 return PTR_ERR(cipher);
177
178 ctx->child = cipher;
179
180 return 0;
181};
182
183static void xcbc_exit_tfm(struct crypto_tfm *tfm)
184{
185 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
186 crypto_free_cipher(ctx->child);
187}
188
189static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
190{
191 struct shash_instance *inst;
192 struct crypto_cipher_spawn *spawn;
193 struct crypto_alg *alg;
194 unsigned long alignmask;
195 u32 mask;
196 int err;
197
198 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
199 if (err)
200 return err;
201
202 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
203 if (!inst)
204 return -ENOMEM;
205 spawn = shash_instance_ctx(inst);
206
207 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
208 crypto_attr_alg_name(tb[1]), 0, mask);
209 if (err)
210 goto err_free_inst;
211 alg = crypto_spawn_cipher_alg(spawn);
212
213 err = -EINVAL;
214 if (alg->cra_blocksize != XCBC_BLOCKSIZE)
215 goto err_free_inst;
216
217 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
218 if (err)
219 goto err_free_inst;
220
221 alignmask = alg->cra_alignmask | 3;
222 inst->alg.base.cra_alignmask = alignmask;
223 inst->alg.base.cra_priority = alg->cra_priority;
224 inst->alg.base.cra_blocksize = alg->cra_blocksize;
225
226 inst->alg.digestsize = alg->cra_blocksize;
227 inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx),
228 crypto_tfm_ctx_alignment()) +
229 (alignmask &
230 ~(crypto_tfm_ctx_alignment() - 1)) +
231 alg->cra_blocksize * 2;
232
233 inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx),
234 alignmask + 1) +
235 alg->cra_blocksize * 2;
236 inst->alg.base.cra_init = xcbc_init_tfm;
237 inst->alg.base.cra_exit = xcbc_exit_tfm;
238
239 inst->alg.init = crypto_xcbc_digest_init;
240 inst->alg.update = crypto_xcbc_digest_update;
241 inst->alg.final = crypto_xcbc_digest_final;
242 inst->alg.setkey = crypto_xcbc_digest_setkey;
243
244 inst->free = shash_free_singlespawn_instance;
245
246 err = shash_register_instance(tmpl, inst);
247 if (err) {
248err_free_inst:
249 shash_free_singlespawn_instance(inst);
250 }
251 return err;
252}
253
254static struct crypto_template crypto_xcbc_tmpl = {
255 .name = "xcbc",
256 .create = xcbc_create,
257 .module = THIS_MODULE,
258};
259
260static int __init crypto_xcbc_module_init(void)
261{
262 return crypto_register_template(&crypto_xcbc_tmpl);
263}
264
265static void __exit crypto_xcbc_module_exit(void)
266{
267 crypto_unregister_template(&crypto_xcbc_tmpl);
268}
269
270subsys_initcall(crypto_xcbc_module_init);
271module_exit(crypto_xcbc_module_exit);
272
273MODULE_LICENSE("GPL");
274MODULE_DESCRIPTION("XCBC keyed hash algorithm");
275MODULE_ALIAS_CRYPTO("xcbc");
276MODULE_IMPORT_NS(CRYPTO_INTERNAL);