1// SPDX-License-Identifier: GPL-2.0-only
2/* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
3 *
4 * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
5 */
6
7#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
8
9#include <linux/crypto.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/mm.h>
13#include <linux/types.h>
14#include <crypto/algapi.h>
15#include <crypto/internal/skcipher.h>
16
17#include <asm/fpumacro.h>
18#include <asm/pstate.h>
19#include <asm/elf.h>
20
21#include "opcodes.h"
22
23#define CAMELLIA_MIN_KEY_SIZE        16
24#define CAMELLIA_MAX_KEY_SIZE        32
25#define CAMELLIA_BLOCK_SIZE          16
26#define CAMELLIA_TABLE_BYTE_LEN     272
27
28struct camellia_sparc64_ctx {
29	u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
30	u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
31	int key_len;
32};
33
34extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
35					unsigned int key_len, u64 *decrypt_key);
36
37static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key,
38			    unsigned int key_len)
39{
40	struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
41	const u32 *in_key = (const u32 *) _in_key;
42
43	if (key_len != 16 && key_len != 24 && key_len != 32)
44		return -EINVAL;
45
46	ctx->key_len = key_len;
47
48	camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0],
49				    key_len, &ctx->decrypt_key[0]);
50	return 0;
51}
52
53static int camellia_set_key_skcipher(struct crypto_skcipher *tfm,
54				     const u8 *in_key, unsigned int key_len)
55{
56	return camellia_set_key(crypto_skcipher_tfm(tfm), in_key, key_len);
57}
58
59extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
60				   u32 *output, unsigned int key_len);
61
62static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
63{
64	struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
65
66	camellia_sparc64_crypt(&ctx->encrypt_key[0],
67			       (const u32 *) src,
68			       (u32 *) dst, ctx->key_len);
69}
70
71static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
72{
73	struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
74
75	camellia_sparc64_crypt(&ctx->decrypt_key[0],
76			       (const u32 *) src,
77			       (u32 *) dst, ctx->key_len);
78}
79
80extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
81
82typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
83			  const u64 *key);
84
85extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
86extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
87
88static int __ecb_crypt(struct skcipher_request *req, bool encrypt)
89{
90	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
91	const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
92	struct skcipher_walk walk;
93	ecb_crypt_op *op;
94	const u64 *key;
95	unsigned int nbytes;
96	int err;
97
98	op = camellia_sparc64_ecb_crypt_3_grand_rounds;
99	if (ctx->key_len != 16)
100		op = camellia_sparc64_ecb_crypt_4_grand_rounds;
101
102	err = skcipher_walk_virt(&walk, req, true);
103	if (err)
104		return err;
105
106	if (encrypt)
107		key = &ctx->encrypt_key[0];
108	else
109		key = &ctx->decrypt_key[0];
110	camellia_sparc64_load_keys(key, ctx->key_len);
111	while ((nbytes = walk.nbytes) != 0) {
112		op(walk.src.virt.addr, walk.dst.virt.addr,
113		   round_down(nbytes, CAMELLIA_BLOCK_SIZE), key);
114		err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE);
115	}
116	fprs_write(0);
117	return err;
118}
119
120static int ecb_encrypt(struct skcipher_request *req)
121{
122	return __ecb_crypt(req, true);
123}
124
125static int ecb_decrypt(struct skcipher_request *req)
126{
127	return __ecb_crypt(req, false);
128}
129
130typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
131			  const u64 *key, u64 *iv);
132
133extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
134extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
135extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
136extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
137
138static int cbc_encrypt(struct skcipher_request *req)
139{
140	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
141	const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
142	struct skcipher_walk walk;
143	cbc_crypt_op *op;
144	const u64 *key;
145	unsigned int nbytes;
146	int err;
147
148	op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
149	if (ctx->key_len != 16)
150		op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
151
152	err = skcipher_walk_virt(&walk, req, true);
153	if (err)
154		return err;
155
156	key = &ctx->encrypt_key[0];
157	camellia_sparc64_load_keys(key, ctx->key_len);
158	while ((nbytes = walk.nbytes) != 0) {
159		op(walk.src.virt.addr, walk.dst.virt.addr,
160		   round_down(nbytes, CAMELLIA_BLOCK_SIZE), key, walk.iv);
161		err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE);
162	}
163	fprs_write(0);
164	return err;
165}
166
167static int cbc_decrypt(struct skcipher_request *req)
168{
169	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
170	const struct camellia_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
171	struct skcipher_walk walk;
172	cbc_crypt_op *op;
173	const u64 *key;
174	unsigned int nbytes;
175	int err;
176
177	op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
178	if (ctx->key_len != 16)
179		op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
180
181	err = skcipher_walk_virt(&walk, req, true);
182	if (err)
183		return err;
184
185	key = &ctx->decrypt_key[0];
186	camellia_sparc64_load_keys(key, ctx->key_len);
187	while ((nbytes = walk.nbytes) != 0) {
188		op(walk.src.virt.addr, walk.dst.virt.addr,
189		   round_down(nbytes, CAMELLIA_BLOCK_SIZE), key, walk.iv);
190		err = skcipher_walk_done(&walk, nbytes % CAMELLIA_BLOCK_SIZE);
191	}
192	fprs_write(0);
193	return err;
194}
195
196static struct crypto_alg cipher_alg = {
197	.cra_name		= "camellia",
198	.cra_driver_name	= "camellia-sparc64",
199	.cra_priority		= SPARC_CR_OPCODE_PRIORITY,
200	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
201	.cra_blocksize		= CAMELLIA_BLOCK_SIZE,
202	.cra_ctxsize		= sizeof(struct camellia_sparc64_ctx),
203	.cra_alignmask		= 3,
204	.cra_module		= THIS_MODULE,
205	.cra_u	= {
206		.cipher	= {
207			.cia_min_keysize	= CAMELLIA_MIN_KEY_SIZE,
208			.cia_max_keysize	= CAMELLIA_MAX_KEY_SIZE,
209			.cia_setkey		= camellia_set_key,
210			.cia_encrypt		= camellia_encrypt,
211			.cia_decrypt		= camellia_decrypt
212		}
213	}
214};
215
216static struct skcipher_alg skcipher_algs[] = {
217	{
218		.base.cra_name		= "ecb(camellia)",
219		.base.cra_driver_name	= "ecb-camellia-sparc64",
220		.base.cra_priority	= SPARC_CR_OPCODE_PRIORITY,
221		.base.cra_blocksize	= CAMELLIA_BLOCK_SIZE,
222		.base.cra_ctxsize	= sizeof(struct camellia_sparc64_ctx),
223		.base.cra_alignmask	= 7,
224		.base.cra_module	= THIS_MODULE,
225		.min_keysize		= CAMELLIA_MIN_KEY_SIZE,
226		.max_keysize		= CAMELLIA_MAX_KEY_SIZE,
227		.setkey			= camellia_set_key_skcipher,
228		.encrypt		= ecb_encrypt,
229		.decrypt		= ecb_decrypt,
230	}, {
231		.base.cra_name		= "cbc(camellia)",
232		.base.cra_driver_name	= "cbc-camellia-sparc64",
233		.base.cra_priority	= SPARC_CR_OPCODE_PRIORITY,
234		.base.cra_blocksize	= CAMELLIA_BLOCK_SIZE,
235		.base.cra_ctxsize	= sizeof(struct camellia_sparc64_ctx),
236		.base.cra_alignmask	= 7,
237		.base.cra_module	= THIS_MODULE,
238		.min_keysize		= CAMELLIA_MIN_KEY_SIZE,
239		.max_keysize		= CAMELLIA_MAX_KEY_SIZE,
240		.ivsize			= CAMELLIA_BLOCK_SIZE,
241		.setkey			= camellia_set_key_skcipher,
242		.encrypt		= cbc_encrypt,
243		.decrypt		= cbc_decrypt,
244	}
245};
246
247static bool __init sparc64_has_camellia_opcode(void)
248{
249	unsigned long cfr;
250
251	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
252		return false;
253
254	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
255	if (!(cfr & CFR_CAMELLIA))
256		return false;
257
258	return true;
259}
260
261static int __init camellia_sparc64_mod_init(void)
262{
263	int err;
264
265	if (!sparc64_has_camellia_opcode()) {
266		pr_info("sparc64 camellia opcodes not available.\n");
267		return -ENODEV;
268	}
269	pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
270	err = crypto_register_alg(&cipher_alg);
271	if (err)
272		return err;
273	err = crypto_register_skciphers(skcipher_algs,
274					ARRAY_SIZE(skcipher_algs));
275	if (err)
276		crypto_unregister_alg(&cipher_alg);
277	return err;
278}
279
280static void __exit camellia_sparc64_mod_fini(void)
281{
282	crypto_unregister_alg(&cipher_alg);
283	crypto_unregister_skciphers(skcipher_algs, ARRAY_SIZE(skcipher_algs));
284}
285
286module_init(camellia_sparc64_mod_init);
287module_exit(camellia_sparc64_mod_fini);
288
289MODULE_LICENSE("GPL");
290MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
291
292MODULE_ALIAS_CRYPTO("camellia");
293
294#include "crop_devid.c"
295