summaryrefslogtreecommitdiff
path: root/arch/x86/crypto/sha1_ssse3_glue.c
blob: 18200135603fc9598075b7aed5d8e3069c149138 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cryptographic API.
 *
 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
 * Supplemental SSE3 instructions.
 *
 * This file is based on sha1_generic.c
 *
 * Copyright (c) Alan Smithee.
 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
 * Copyright (c) Mathias Krause <minipli@googlemail.com>
 * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/sha.h>
#include <crypto/sha1_base.h>
#include <asm/simd.h>

static int sha1_update(struct shash_desc *desc, const u8 *data,
			     unsigned int len, sha1_block_fn *sha1_xform)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable() ||
	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
		return crypto_sha1_update(desc, data, len);

	/*
	 * Make sure struct sha1_state begins directly with the SHA1
	 * 160-bit internal state, as this is what the asm functions expect.
	 */
	BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0);

	kernel_fpu_begin();
	sha1_base_do_update(desc, data, len, sha1_xform);
	kernel_fpu_end();

	return 0;
}

static int sha1_finup(struct shash_desc *desc, const u8 *data,
		      unsigned int len, u8 *out, sha1_block_fn *sha1_xform)
{
	if (!crypto_simd_usable())
		return crypto_sha1_finup(desc, data, len, out);

	kernel_fpu_begin();
	if (len)
		sha1_base_do_update(desc, data, len, sha1_xform);
	sha1_base_do_finalize(desc, sha1_xform);
	kernel_fpu_end();

	return sha1_base_finish(desc, out);
}

asmlinkage void sha1_transform_ssse3(struct sha1_state *state,
				     const u8 *data, int blocks);

static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data,
			     unsigned int len)
{
	return sha1_update(desc, data, len, sha1_transform_ssse3);
}

static int sha1_ssse3_finup(struct shash_desc *desc, const u8 *data,
			      unsigned int len, u8 *out)
{
	return sha1_finup(desc, data, len, out, sha1_transform_ssse3);
}

/* Add padding and return the message digest. */
static int sha1_ssse3_final(struct shash_desc *desc, u8 *out)
{
	return sha1_ssse3_finup(desc, NULL, 0, out);
}

static struct shash_alg sha1_ssse3_alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init		=	sha1_base_init,
	.update		=	sha1_ssse3_update,
	.final		=	sha1_ssse3_final,
	.finup		=	sha1_ssse3_finup,
	.descsize	=	sizeof(struct sha1_state),
	.base		=	{
		.cra_name	=	"sha1",
		.cra_driver_name =	"sha1-ssse3",
		.cra_priority	=	150,
		.cra_blocksize	=	SHA1_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static int register_sha1_ssse3(void)
{
	if (boot_cpu_has(X86_FEATURE_SSSE3))
		return crypto_register_shash(&sha1_ssse3_alg);
	return 0;
}

static void unregister_sha1_ssse3(void)
{
	if (boot_cpu_has(X86_FEATURE_SSSE3))
		crypto_unregister_shash(&sha1_ssse3_alg);
}

asmlinkage void sha1_transform_avx(struct sha1_state *state,
				   const u8 *data, int blocks);

static int sha1_avx_update(struct shash_desc *desc, const u8 *data,
			     unsigned int len)
{
	return sha1_update(desc, data, len, sha1_transform_avx);
}

static int sha1_avx_finup(struct shash_desc *desc, const u8 *data,
			      unsigned int len, u8 *out)
{
	return sha1_finup(desc, data, len, out, sha1_transform_avx);
}

static int sha1_avx_final(struct shash_desc *desc, u8 *out)
{
	return sha1_avx_finup(desc, NULL, 0, out);
}

static struct shash_alg sha1_avx_alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init		=	sha1_base_init,
	.update		=	sha1_avx_update,
	.final		=	sha1_avx_final,
	.finup		=	sha1_avx_finup,
	.descsize	=	sizeof(struct sha1_state),
	.base		=	{
		.cra_name	=	"sha1",
		.cra_driver_name =	"sha1-avx",
		.cra_priority	=	160,
		.cra_blocksize	=	SHA1_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static bool avx_usable(void)
{
	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
		if (boot_cpu_has(X86_FEATURE_AVX))
			pr_info("AVX detected but unusable.\n");
		return false;
	}

	return true;
}

static int register_sha1_avx(void)
{
	if (avx_usable())
		return crypto_register_shash(&sha1_avx_alg);
	return 0;
}

static void unregister_sha1_avx(void)
{
	if (avx_usable())
		crypto_unregister_shash(&sha1_avx_alg);
}

#define SHA1_AVX2_BLOCK_OPTSIZE	4	/* optimal 4*64 bytes of SHA1 blocks */

asmlinkage void sha1_transform_avx2(struct sha1_state *state,
				    const u8 *data, int blocks);

static bool avx2_usable(void)
{
	if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2)
		&& boot_cpu_has(X86_FEATURE_BMI1)
		&& boot_cpu_has(X86_FEATURE_BMI2))
		return true;

	return false;
}

static void sha1_apply_transform_avx2(struct sha1_state *state,
				      const u8 *data, int blocks)
{
	/* Select the optimal transform based on data block size */
	if (blocks >= SHA1_AVX2_BLOCK_OPTSIZE)
		sha1_transform_avx2(state, data, blocks);
	else
		sha1_transform_avx(state, data, blocks);
}

static int sha1_avx2_update(struct shash_desc *desc, const u8 *data,
			     unsigned int len)
{
	return sha1_update(desc, data, len, sha1_apply_transform_avx2);
}

static int sha1_avx2_finup(struct shash_desc *desc, const u8 *data,
			      unsigned int len, u8 *out)
{
	return sha1_finup(desc, data, len, out, sha1_apply_transform_avx2);
}

static int sha1_avx2_final(struct shash_desc *desc, u8 *out)
{
	return sha1_avx2_finup(desc, NULL, 0, out);
}

static struct shash_alg sha1_avx2_alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init		=	sha1_base_init,
	.update		=	sha1_avx2_update,
	.final		=	sha1_avx2_final,
	.finup		=	sha1_avx2_finup,
	.descsize	=	sizeof(struct sha1_state),
	.base		=	{
		.cra_name	=	"sha1",
		.cra_driver_name =	"sha1-avx2",
		.cra_priority	=	170,
		.cra_blocksize	=	SHA1_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static int register_sha1_avx2(void)
{
	if (avx2_usable())
		return crypto_register_shash(&sha1_avx2_alg);
	return 0;
}

static void unregister_sha1_avx2(void)
{
	if (avx2_usable())
		crypto_unregister_shash(&sha1_avx2_alg);
}

#ifdef CONFIG_AS_SHA1_NI
asmlinkage void sha1_ni_transform(struct sha1_state *digest, const u8 *data,
				  int rounds);

static int sha1_ni_update(struct shash_desc *desc, const u8 *data,
			     unsigned int len)
{
	return sha1_update(desc, data, len, sha1_ni_transform);
}

static int sha1_ni_finup(struct shash_desc *desc, const u8 *data,
			      unsigned int len, u8 *out)
{
	return sha1_finup(desc, data, len, out, sha1_ni_transform);
}

static int sha1_ni_final(struct shash_desc *desc, u8 *out)
{
	return sha1_ni_finup(desc, NULL, 0, out);
}

static struct shash_alg sha1_ni_alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init		=	sha1_base_init,
	.update		=	sha1_ni_update,
	.final		=	sha1_ni_final,
	.finup		=	sha1_ni_finup,
	.descsize	=	sizeof(struct sha1_state),
	.base		=	{
		.cra_name	=	"sha1",
		.cra_driver_name =	"sha1-ni",
		.cra_priority	=	250,
		.cra_blocksize	=	SHA1_BLOCK_SIZE,
		.cra_module	=	THIS_MODULE,
	}
};

static int register_sha1_ni(void)
{
	if (boot_cpu_has(X86_FEATURE_SHA_NI))
		return crypto_register_shash(&sha1_ni_alg);
	return 0;
}

static void unregister_sha1_ni(void)
{
	if (boot_cpu_has(X86_FEATURE_SHA_NI))
		crypto_unregister_shash(&sha1_ni_alg);
}

#else
static inline int register_sha1_ni(void) { return 0; }
static inline void unregister_sha1_ni(void) { }
#endif

static int __init sha1_ssse3_mod_init(void)
{
	if (register_sha1_ssse3())
		goto fail;

	if (register_sha1_avx()) {
		unregister_sha1_ssse3();
		goto fail;
	}

	if (register_sha1_avx2()) {
		unregister_sha1_avx();
		unregister_sha1_ssse3();
		goto fail;
	}

	if (register_sha1_ni()) {
		unregister_sha1_avx2();
		unregister_sha1_avx();
		unregister_sha1_ssse3();
		goto fail;
	}

	return 0;
fail:
	return -ENODEV;
}

static void __exit sha1_ssse3_mod_fini(void)
{
	unregister_sha1_ni();
	unregister_sha1_avx2();
	unregister_sha1_avx();
	unregister_sha1_ssse3();
}

module_init(sha1_ssse3_mod_init);
module_exit(sha1_ssse3_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, Supplemental SSE3 accelerated");

MODULE_ALIAS_CRYPTO("sha1");
MODULE_ALIAS_CRYPTO("sha1-ssse3");
MODULE_ALIAS_CRYPTO("sha1-avx");
MODULE_ALIAS_CRYPTO("sha1-avx2");
#ifdef CONFIG_AS_SHA1_NI
MODULE_ALIAS_CRYPTO("sha1-ni");
#endif