11ccea77eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2333b0d7eSKazunori MIYAZAWA /*
3333b0d7eSKazunori MIYAZAWA * Copyright (C)2006 USAGI/WIDE Project
4333b0d7eSKazunori MIYAZAWA *
5333b0d7eSKazunori MIYAZAWA * Author:
6333b0d7eSKazunori MIYAZAWA * Kazunori Miyazawa <miyazawa@linux-ipv6.org>
7333b0d7eSKazunori MIYAZAWA */
8333b0d7eSKazunori MIYAZAWA
90eb76ba2SArd Biesheuvel #include <crypto/internal/cipher.h>
103106caabSHerbert Xu #include <crypto/internal/hash.h>
11333b0d7eSKazunori MIYAZAWA #include <linux/err.h>
12333b0d7eSKazunori MIYAZAWA #include <linux/kernel.h>
134bb33cc8SPaul Gortmaker #include <linux/module.h>
14333b0d7eSKazunori MIYAZAWA
155b37538aSAdrian Bunk static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
16333b0d7eSKazunori MIYAZAWA 0x02020202, 0x02020202, 0x02020202, 0x02020202,
17333b0d7eSKazunori MIYAZAWA 0x03030303, 0x03030303, 0x03030303, 0x03030303};
18ac95301fSHerbert Xu
19333b0d7eSKazunori MIYAZAWA /*
20333b0d7eSKazunori MIYAZAWA * +------------------------
21333b0d7eSKazunori MIYAZAWA * | <parent tfm>
22333b0d7eSKazunori MIYAZAWA * +------------------------
23ac95301fSHerbert Xu * | xcbc_tfm_ctx
24ac95301fSHerbert Xu * +------------------------
25ac95301fSHerbert Xu * | consts (block size * 2)
26ac95301fSHerbert Xu * +------------------------
27ac95301fSHerbert Xu */
28ac95301fSHerbert Xu struct xcbc_tfm_ctx {
29ac95301fSHerbert Xu struct crypto_cipher *child;
30*a2b11180SEric Biggers u8 consts[];
31ac95301fSHerbert Xu };
32ac95301fSHerbert Xu
33ac95301fSHerbert Xu /*
34ac95301fSHerbert Xu * +------------------------
35ac95301fSHerbert Xu * | <shash desc>
36ac95301fSHerbert Xu * +------------------------
37ac95301fSHerbert Xu * | xcbc_desc_ctx
38333b0d7eSKazunori MIYAZAWA * +------------------------
39333b0d7eSKazunori MIYAZAWA * | odds (block size)
40333b0d7eSKazunori MIYAZAWA * +------------------------
41333b0d7eSKazunori MIYAZAWA * | prev (block size)
42333b0d7eSKazunori MIYAZAWA * +------------------------
43333b0d7eSKazunori MIYAZAWA */
44ac95301fSHerbert Xu struct xcbc_desc_ctx {
45333b0d7eSKazunori MIYAZAWA unsigned int len;
46*a2b11180SEric Biggers u8 odds[];
47333b0d7eSKazunori MIYAZAWA };
48333b0d7eSKazunori MIYAZAWA
493bdd23f8SKees Cook #define XCBC_BLOCKSIZE 16
503bdd23f8SKees Cook
crypto_xcbc_digest_setkey(struct crypto_shash * parent,const u8 * inkey,unsigned int keylen)513106caabSHerbert Xu static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
52333b0d7eSKazunori MIYAZAWA const u8 *inkey, unsigned int keylen)
53333b0d7eSKazunori MIYAZAWA {
54ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
55*a2b11180SEric Biggers u8 *consts = ctx->consts;
56ac95301fSHerbert Xu int err = 0;
573bdd23f8SKees Cook u8 key1[XCBC_BLOCKSIZE];
583bdd23f8SKees Cook int bs = sizeof(key1);
59333b0d7eSKazunori MIYAZAWA
60ac95301fSHerbert Xu if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
61ac95301fSHerbert Xu return err;
62333b0d7eSKazunori MIYAZAWA
63ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
64ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
65ac95301fSHerbert Xu crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
66333b0d7eSKazunori MIYAZAWA
67ac95301fSHerbert Xu return crypto_cipher_setkey(ctx->child, key1, bs);
68ac95301fSHerbert Xu
69333b0d7eSKazunori MIYAZAWA }
70333b0d7eSKazunori MIYAZAWA
crypto_xcbc_digest_init(struct shash_desc * pdesc)713106caabSHerbert Xu static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
72333b0d7eSKazunori MIYAZAWA {
73ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
743106caabSHerbert Xu int bs = crypto_shash_blocksize(pdesc->tfm);
75*a2b11180SEric Biggers u8 *prev = &ctx->odds[bs];
76333b0d7eSKazunori MIYAZAWA
77333b0d7eSKazunori MIYAZAWA ctx->len = 0;
78ac95301fSHerbert Xu memset(prev, 0, bs);
79333b0d7eSKazunori MIYAZAWA
80333b0d7eSKazunori MIYAZAWA return 0;
81333b0d7eSKazunori MIYAZAWA }
82333b0d7eSKazunori MIYAZAWA
crypto_xcbc_digest_update(struct shash_desc * pdesc,const u8 * p,unsigned int len)833106caabSHerbert Xu static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
843106caabSHerbert Xu unsigned int len)
85333b0d7eSKazunori MIYAZAWA {
863106caabSHerbert Xu struct crypto_shash *parent = pdesc->tfm;
87ac95301fSHerbert Xu struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
88ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
89ac95301fSHerbert Xu struct crypto_cipher *tfm = tctx->child;
903106caabSHerbert Xu int bs = crypto_shash_blocksize(parent);
91*a2b11180SEric Biggers u8 *odds = ctx->odds;
92ac95301fSHerbert Xu u8 *prev = odds + bs;
93333b0d7eSKazunori MIYAZAWA
94333b0d7eSKazunori MIYAZAWA /* checking the data can fill the block */
95333b0d7eSKazunori MIYAZAWA if ((ctx->len + len) <= bs) {
96ac95301fSHerbert Xu memcpy(odds + ctx->len, p, len);
97333b0d7eSKazunori MIYAZAWA ctx->len += len;
983106caabSHerbert Xu return 0;
99333b0d7eSKazunori MIYAZAWA }
100333b0d7eSKazunori MIYAZAWA
101333b0d7eSKazunori MIYAZAWA /* filling odds with new data and encrypting it */
102ac95301fSHerbert Xu memcpy(odds + ctx->len, p, bs - ctx->len);
103333b0d7eSKazunori MIYAZAWA len -= bs - ctx->len;
104333b0d7eSKazunori MIYAZAWA p += bs - ctx->len;
105333b0d7eSKazunori MIYAZAWA
106ac95301fSHerbert Xu crypto_xor(prev, odds, bs);
107ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, prev, prev);
108333b0d7eSKazunori MIYAZAWA
109333b0d7eSKazunori MIYAZAWA /* clearing the length */
110333b0d7eSKazunori MIYAZAWA ctx->len = 0;
111333b0d7eSKazunori MIYAZAWA
112333b0d7eSKazunori MIYAZAWA /* encrypting the rest of data */
113333b0d7eSKazunori MIYAZAWA while (len > bs) {
114ac95301fSHerbert Xu crypto_xor(prev, p, bs);
115ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, prev, prev);
116333b0d7eSKazunori MIYAZAWA p += bs;
117333b0d7eSKazunori MIYAZAWA len -= bs;
118333b0d7eSKazunori MIYAZAWA }
119333b0d7eSKazunori MIYAZAWA
120333b0d7eSKazunori MIYAZAWA /* keeping the surplus of blocksize */
121333b0d7eSKazunori MIYAZAWA if (len) {
122ac95301fSHerbert Xu memcpy(odds, p, len);
123333b0d7eSKazunori MIYAZAWA ctx->len = len;
124333b0d7eSKazunori MIYAZAWA }
125333b0d7eSKazunori MIYAZAWA
126333b0d7eSKazunori MIYAZAWA return 0;
127333b0d7eSKazunori MIYAZAWA }
128333b0d7eSKazunori MIYAZAWA
crypto_xcbc_digest_final(struct shash_desc * pdesc,u8 * out)1293106caabSHerbert Xu static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
130fb469840SHerbert Xu {
1313106caabSHerbert Xu struct crypto_shash *parent = pdesc->tfm;
132ac95301fSHerbert Xu struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
133ac95301fSHerbert Xu struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
134ac95301fSHerbert Xu struct crypto_cipher *tfm = tctx->child;
1353106caabSHerbert Xu int bs = crypto_shash_blocksize(parent);
136*a2b11180SEric Biggers u8 *odds = ctx->odds;
137ac95301fSHerbert Xu u8 *prev = odds + bs;
138ac95301fSHerbert Xu unsigned int offset = 0;
139333b0d7eSKazunori MIYAZAWA
140ac95301fSHerbert Xu if (ctx->len != bs) {
141333b0d7eSKazunori MIYAZAWA unsigned int rlen;
142ac95301fSHerbert Xu u8 *p = odds + ctx->len;
143ac95301fSHerbert Xu
144333b0d7eSKazunori MIYAZAWA *p = 0x80;
145333b0d7eSKazunori MIYAZAWA p++;
146333b0d7eSKazunori MIYAZAWA
147333b0d7eSKazunori MIYAZAWA rlen = bs - ctx->len -1;
148333b0d7eSKazunori MIYAZAWA if (rlen)
149333b0d7eSKazunori MIYAZAWA memset(p, 0, rlen);
150333b0d7eSKazunori MIYAZAWA
151ac95301fSHerbert Xu offset += bs;
152333b0d7eSKazunori MIYAZAWA }
153333b0d7eSKazunori MIYAZAWA
154ac95301fSHerbert Xu crypto_xor(prev, odds, bs);
155*a2b11180SEric Biggers crypto_xor(prev, &tctx->consts[offset], bs);
156ac95301fSHerbert Xu
157ac95301fSHerbert Xu crypto_cipher_encrypt_one(tfm, out, prev);
158ac95301fSHerbert Xu
159333b0d7eSKazunori MIYAZAWA return 0;
160333b0d7eSKazunori MIYAZAWA }
161333b0d7eSKazunori MIYAZAWA
xcbc_init_tfm(struct crypto_tfm * tfm)162333b0d7eSKazunori MIYAZAWA static int xcbc_init_tfm(struct crypto_tfm *tfm)
163333b0d7eSKazunori MIYAZAWA {
1642e306ee0SHerbert Xu struct crypto_cipher *cipher;
165333b0d7eSKazunori MIYAZAWA struct crypto_instance *inst = (void *)tfm->__crt_alg;
166d5ed3b65SEric Biggers struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
167ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
168333b0d7eSKazunori MIYAZAWA
1692e306ee0SHerbert Xu cipher = crypto_spawn_cipher(spawn);
1702e306ee0SHerbert Xu if (IS_ERR(cipher))
1712e306ee0SHerbert Xu return PTR_ERR(cipher);
172333b0d7eSKazunori MIYAZAWA
1732e306ee0SHerbert Xu ctx->child = cipher;
174333b0d7eSKazunori MIYAZAWA
175333b0d7eSKazunori MIYAZAWA return 0;
176333b0d7eSKazunori MIYAZAWA };
177333b0d7eSKazunori MIYAZAWA
xcbc_exit_tfm(struct crypto_tfm * tfm)178333b0d7eSKazunori MIYAZAWA static void xcbc_exit_tfm(struct crypto_tfm *tfm)
179333b0d7eSKazunori MIYAZAWA {
180ac95301fSHerbert Xu struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
181333b0d7eSKazunori MIYAZAWA crypto_free_cipher(ctx->child);
182333b0d7eSKazunori MIYAZAWA }
183333b0d7eSKazunori MIYAZAWA
xcbc_create(struct crypto_template * tmpl,struct rtattr ** tb)1843106caabSHerbert Xu static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
185333b0d7eSKazunori MIYAZAWA {
1863106caabSHerbert Xu struct shash_instance *inst;
1871e212a6aSEric Biggers struct crypto_cipher_spawn *spawn;
188333b0d7eSKazunori MIYAZAWA struct crypto_alg *alg;
1897bcb2c99SEric Biggers u32 mask;
190ebc610e5SHerbert Xu int err;
191ebc610e5SHerbert Xu
1927bcb2c99SEric Biggers err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
193ebc610e5SHerbert Xu if (err)
1943106caabSHerbert Xu return err;
195ebc610e5SHerbert Xu
1961e212a6aSEric Biggers inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1971e212a6aSEric Biggers if (!inst)
1981e212a6aSEric Biggers return -ENOMEM;
1991e212a6aSEric Biggers spawn = shash_instance_ctx(inst);
200333b0d7eSKazunori MIYAZAWA
2011e212a6aSEric Biggers err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
2027bcb2c99SEric Biggers crypto_attr_alg_name(tb[1]), 0, mask);
2033106caabSHerbert Xu if (err)
2041e212a6aSEric Biggers goto err_free_inst;
2051e212a6aSEric Biggers alg = crypto_spawn_cipher_alg(spawn);
2061e212a6aSEric Biggers
2071e212a6aSEric Biggers err = -EINVAL;
2081e212a6aSEric Biggers if (alg->cra_blocksize != XCBC_BLOCKSIZE)
2091e212a6aSEric Biggers goto err_free_inst;
2101e212a6aSEric Biggers
2111e212a6aSEric Biggers err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
2121e212a6aSEric Biggers if (err)
2131e212a6aSEric Biggers goto err_free_inst;
214333b0d7eSKazunori MIYAZAWA
2153106caabSHerbert Xu inst->alg.base.cra_priority = alg->cra_priority;
2163106caabSHerbert Xu inst->alg.base.cra_blocksize = alg->cra_blocksize;
217*a2b11180SEric Biggers inst->alg.base.cra_ctxsize = sizeof(struct xcbc_tfm_ctx) +
218*a2b11180SEric Biggers alg->cra_blocksize * 2;
219333b0d7eSKazunori MIYAZAWA
2203106caabSHerbert Xu inst->alg.digestsize = alg->cra_blocksize;
221*a2b11180SEric Biggers inst->alg.descsize = sizeof(struct xcbc_desc_ctx) +
222ac95301fSHerbert Xu alg->cra_blocksize * 2;
223ac95301fSHerbert Xu
2243106caabSHerbert Xu inst->alg.base.cra_init = xcbc_init_tfm;
2253106caabSHerbert Xu inst->alg.base.cra_exit = xcbc_exit_tfm;
2263106caabSHerbert Xu
2273106caabSHerbert Xu inst->alg.init = crypto_xcbc_digest_init;
2283106caabSHerbert Xu inst->alg.update = crypto_xcbc_digest_update;
2293106caabSHerbert Xu inst->alg.final = crypto_xcbc_digest_final;
2303106caabSHerbert Xu inst->alg.setkey = crypto_xcbc_digest_setkey;
2313106caabSHerbert Xu
232a39c66ccSEric Biggers inst->free = shash_free_singlespawn_instance;
233a39c66ccSEric Biggers
2343106caabSHerbert Xu err = shash_register_instance(tmpl, inst);
2353106caabSHerbert Xu if (err) {
2361e212a6aSEric Biggers err_free_inst:
237a39c66ccSEric Biggers shash_free_singlespawn_instance(inst);
2383106caabSHerbert Xu }
2393106caabSHerbert Xu return err;
240333b0d7eSKazunori MIYAZAWA }
241333b0d7eSKazunori MIYAZAWA
242333b0d7eSKazunori MIYAZAWA static struct crypto_template crypto_xcbc_tmpl = {
243333b0d7eSKazunori MIYAZAWA .name = "xcbc",
2443106caabSHerbert Xu .create = xcbc_create,
245333b0d7eSKazunori MIYAZAWA .module = THIS_MODULE,
246333b0d7eSKazunori MIYAZAWA };
247333b0d7eSKazunori MIYAZAWA
crypto_xcbc_module_init(void)248333b0d7eSKazunori MIYAZAWA static int __init crypto_xcbc_module_init(void)
249333b0d7eSKazunori MIYAZAWA {
250333b0d7eSKazunori MIYAZAWA return crypto_register_template(&crypto_xcbc_tmpl);
251333b0d7eSKazunori MIYAZAWA }
252333b0d7eSKazunori MIYAZAWA
crypto_xcbc_module_exit(void)253333b0d7eSKazunori MIYAZAWA static void __exit crypto_xcbc_module_exit(void)
254333b0d7eSKazunori MIYAZAWA {
255333b0d7eSKazunori MIYAZAWA crypto_unregister_template(&crypto_xcbc_tmpl);
256333b0d7eSKazunori MIYAZAWA }
257333b0d7eSKazunori MIYAZAWA
258c4741b23SEric Biggers subsys_initcall(crypto_xcbc_module_init);
259333b0d7eSKazunori MIYAZAWA module_exit(crypto_xcbc_module_exit);
260333b0d7eSKazunori MIYAZAWA
261333b0d7eSKazunori MIYAZAWA MODULE_LICENSE("GPL");
262333b0d7eSKazunori MIYAZAWA MODULE_DESCRIPTION("XCBC keyed hash algorithm");
2634943ba16SKees Cook MODULE_ALIAS_CRYPTO("xcbc");
2640eb76ba2SArd Biesheuvel MODULE_IMPORT_NS(CRYPTO_INTERNAL);
265