camellia_glue.c

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