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 
28 struct 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 
34 extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
35 					unsigned int key_len, u64 *decrypt_key);
36 
camellia_set_key(struct crypto_tfm * tfm,const u8 * _in_key,unsigned int key_len)37 static 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 
camellia_set_key_skcipher(struct crypto_skcipher * tfm,const u8 * in_key,unsigned int key_len)53 static 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 
59 extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
60 				   u32 *output, unsigned int key_len);
61 
camellia_encrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)62 static 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 
camellia_decrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)71 static 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 
80 extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
81 
82 typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
83 			  const u64 *key);
84 
85 extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
86 extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
87 
__ecb_crypt(struct skcipher_request * req,bool encrypt)88 static 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 
ecb_encrypt(struct skcipher_request * req)120 static int ecb_encrypt(struct skcipher_request *req)
121 {
122 	return __ecb_crypt(req, true);
123 }
124 
ecb_decrypt(struct skcipher_request * req)125 static int ecb_decrypt(struct skcipher_request *req)
126 {
127 	return __ecb_crypt(req, false);
128 }
129 
130 typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
131 			  const u64 *key, u64 *iv);
132 
133 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
134 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
135 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
136 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
137 
cbc_encrypt(struct skcipher_request * req)138 static 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 
cbc_decrypt(struct skcipher_request * req)167 static 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 
196 static 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 
216 static 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 
sparc64_has_camellia_opcode(void)247 static 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 
camellia_sparc64_mod_init(void)261 static 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 
camellia_sparc64_mod_fini(void)280 static 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 
286 module_init(camellia_sparc64_mod_init);
287 module_exit(camellia_sparc64_mod_fini);
288 
289 MODULE_LICENSE("GPL");
290 MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
291 
292 MODULE_ALIAS_CRYPTO("camellia");
293 
294 #include "crop_devid.c"
295