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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 consts[];
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 odds[];
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 struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
55 u8 *consts = ctx->consts;
56 int err = 0;
57 u8 key1[XCBC_BLOCKSIZE];
58 int bs = sizeof(key1);
59
60 if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
61 return err;
62
63 crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
64 crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
65 crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
66
67 return crypto_cipher_setkey(ctx->child, key1, bs);
68
69}
70
71static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
72{
73 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
74 int bs = crypto_shash_blocksize(pdesc->tfm);
75 u8 *prev = &ctx->odds[bs];
76
77 ctx->len = 0;
78 memset(prev, 0, bs);
79
80 return 0;
81}
82
83static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
84 unsigned int len)
85{
86 struct crypto_shash *parent = pdesc->tfm;
87 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
88 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
89 struct crypto_cipher *tfm = tctx->child;
90 int bs = crypto_shash_blocksize(parent);
91 u8 *odds = ctx->odds;
92 u8 *prev = odds + bs;
93
94 /* checking the data can fill the block */
95 if ((ctx->len + len) <= bs) {
96 memcpy(odds + ctx->len, p, len);
97 ctx->len += len;
98 return 0;
99 }
100
101 /* filling odds with new data and encrypting it */
102 memcpy(odds + ctx->len, p, bs - ctx->len);
103 len -= bs - ctx->len;
104 p += bs - ctx->len;
105
106 crypto_xor(prev, odds, bs);
107 crypto_cipher_encrypt_one(tfm, prev, prev);
108
109 /* clearing the length */
110 ctx->len = 0;
111
112 /* encrypting the rest of data */
113 while (len > bs) {
114 crypto_xor(prev, p, bs);
115 crypto_cipher_encrypt_one(tfm, prev, prev);
116 p += bs;
117 len -= bs;
118 }
119
120 /* keeping the surplus of blocksize */
121 if (len) {
122 memcpy(odds, p, len);
123 ctx->len = len;
124 }
125
126 return 0;
127}
128
129static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
130{
131 struct crypto_shash *parent = pdesc->tfm;
132 struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
133 struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
134 struct crypto_cipher *tfm = tctx->child;
135 int bs = crypto_shash_blocksize(parent);
136 u8 *odds = ctx->odds;
137 u8 *prev = odds + bs;
138 unsigned int offset = 0;
139
140 if (ctx->len != bs) {
141 unsigned int rlen;
142 u8 *p = odds + ctx->len;
143
144 *p = 0x80;
145 p++;
146
147 rlen = bs - ctx->len -1;
148 if (rlen)
149 memset(p, 0, rlen);
150
151 offset += bs;
152 }
153
154 crypto_xor(prev, odds, bs);
155 crypto_xor(prev, &tctx->consts[offset], bs);
156
157 crypto_cipher_encrypt_one(tfm, out, prev);
158
159 return 0;
160}
161
162static int xcbc_init_tfm(struct crypto_tfm *tfm)
163{
164 struct crypto_cipher *cipher;
165 struct crypto_instance *inst = (void *)tfm->__crt_alg;
166 struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
167 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
168
169 cipher = crypto_spawn_cipher(spawn);
170 if (IS_ERR(cipher))
171 return PTR_ERR(cipher);
172
173 ctx->child = cipher;
174
175 return 0;
176};
177
178static void xcbc_exit_tfm(struct crypto_tfm *tfm)
179{
180 struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
181 crypto_free_cipher(ctx->child);
182}
183
184static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
185{
186 struct shash_instance *inst;
187 struct crypto_cipher_spawn *spawn;
188 struct crypto_alg *alg;
189 u32 mask;
190 int err;
191
192 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
193 if (err)
194 return err;
195
196 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
197 if (!inst)
198 return -ENOMEM;
199 spawn = shash_instance_ctx(inst);
200
201 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
202 crypto_attr_alg_name(tb[1]), 0, mask);
203 if (err)
204 goto err_free_inst;
205 alg = crypto_spawn_cipher_alg(spawn);
206
207 err = -EINVAL;
208 if (alg->cra_blocksize != XCBC_BLOCKSIZE)
209 goto err_free_inst;
210
211 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
212 if (err)
213 goto err_free_inst;
214
215 inst->alg.base.cra_priority = alg->cra_priority;
216 inst->alg.base.cra_blocksize = alg->cra_blocksize;
217 inst->alg.base.cra_ctxsize = sizeof(struct xcbc_tfm_ctx) +
218 alg->cra_blocksize * 2;
219
220 inst->alg.digestsize = alg->cra_blocksize;
221 inst->alg.descsize = sizeof(struct xcbc_desc_ctx) +
222 alg->cra_blocksize * 2;
223
224 inst->alg.base.cra_init = xcbc_init_tfm;
225 inst->alg.base.cra_exit = xcbc_exit_tfm;
226
227 inst->alg.init = crypto_xcbc_digest_init;
228 inst->alg.update = crypto_xcbc_digest_update;
229 inst->alg.final = crypto_xcbc_digest_final;
230 inst->alg.setkey = crypto_xcbc_digest_setkey;
231
232 inst->free = shash_free_singlespawn_instance;
233
234 err = shash_register_instance(tmpl, inst);
235 if (err) {
236err_free_inst:
237 shash_free_singlespawn_instance(inst);
238 }
239 return err;
240}
241
242static struct crypto_template crypto_xcbc_tmpl = {
243 .name = "xcbc",
244 .create = xcbc_create,
245 .module = THIS_MODULE,
246};
247
248static int __init crypto_xcbc_module_init(void)
249{
250 return crypto_register_template(&crypto_xcbc_tmpl);
251}
252
253static void __exit crypto_xcbc_module_exit(void)
254{
255 crypto_unregister_template(&crypto_xcbc_tmpl);
256}
257
258subsys_initcall(crypto_xcbc_module_init);
259module_exit(crypto_xcbc_module_exit);
260
261MODULE_LICENSE("GPL");
262MODULE_DESCRIPTION("XCBC keyed hash algorithm");
263MODULE_ALIAS_CRYPTO("xcbc");
264MODULE_IMPORT_NS(CRYPTO_INTERNAL);
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");