1 /*
2 * Cryptographic API.
3 *
4 * Glue code for the SHA512 Secure Hash Algorithm assembler
5 * implementation using supplemental SSE3 / AVX / AVX2 instructions.
6 *
7 * This file is based on sha512_generic.c
8 *
9 * Copyright (C) 2013 Intel Corporation
10 * Author: Tim Chen <tim.c.chen@linux.intel.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
21 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE.
25 *
26 */
27
28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
30 #include <crypto/internal/hash.h>
31 #include <crypto/internal/simd.h>
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/mm.h>
35 #include <linux/string.h>
36 #include <linux/types.h>
37 #include <crypto/sha2.h>
38 #include <crypto/sha512_base.h>
39 #include <asm/cpu_device_id.h>
40 #include <asm/simd.h>
41
42 asmlinkage void sha512_transform_ssse3(struct sha512_state *state,
43 const u8 *data, int blocks);
44
sha512_update(struct shash_desc * desc,const u8 * data,unsigned int len,sha512_block_fn * sha512_xform)45 static int sha512_update(struct shash_desc *desc, const u8 *data,
46 unsigned int len, sha512_block_fn *sha512_xform)
47 {
48 struct sha512_state *sctx = shash_desc_ctx(desc);
49
50 if (!crypto_simd_usable() ||
51 (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
52 return crypto_sha512_update(desc, data, len);
53
54 /*
55 * Make sure struct sha512_state begins directly with the SHA512
56 * 512-bit internal state, as this is what the asm functions expect.
57 */
58 BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
59
60 kernel_fpu_begin();
61 sha512_base_do_update(desc, data, len, sha512_xform);
62 kernel_fpu_end();
63
64 return 0;
65 }
66
sha512_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out,sha512_block_fn * sha512_xform)67 static int sha512_finup(struct shash_desc *desc, const u8 *data,
68 unsigned int len, u8 *out, sha512_block_fn *sha512_xform)
69 {
70 if (!crypto_simd_usable())
71 return crypto_sha512_finup(desc, data, len, out);
72
73 kernel_fpu_begin();
74 if (len)
75 sha512_base_do_update(desc, data, len, sha512_xform);
76 sha512_base_do_finalize(desc, sha512_xform);
77 kernel_fpu_end();
78
79 return sha512_base_finish(desc, out);
80 }
81
sha512_ssse3_update(struct shash_desc * desc,const u8 * data,unsigned int len)82 static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
83 unsigned int len)
84 {
85 return sha512_update(desc, data, len, sha512_transform_ssse3);
86 }
87
sha512_ssse3_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)88 static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
89 unsigned int len, u8 *out)
90 {
91 return sha512_finup(desc, data, len, out, sha512_transform_ssse3);
92 }
93
94 /* Add padding and return the message digest. */
sha512_ssse3_final(struct shash_desc * desc,u8 * out)95 static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
96 {
97 return sha512_ssse3_finup(desc, NULL, 0, out);
98 }
99
100 static struct shash_alg sha512_ssse3_algs[] = { {
101 .digestsize = SHA512_DIGEST_SIZE,
102 .init = sha512_base_init,
103 .update = sha512_ssse3_update,
104 .final = sha512_ssse3_final,
105 .finup = sha512_ssse3_finup,
106 .descsize = sizeof(struct sha512_state),
107 .base = {
108 .cra_name = "sha512",
109 .cra_driver_name = "sha512-ssse3",
110 .cra_priority = 150,
111 .cra_blocksize = SHA512_BLOCK_SIZE,
112 .cra_module = THIS_MODULE,
113 }
114 }, {
115 .digestsize = SHA384_DIGEST_SIZE,
116 .init = sha384_base_init,
117 .update = sha512_ssse3_update,
118 .final = sha512_ssse3_final,
119 .finup = sha512_ssse3_finup,
120 .descsize = sizeof(struct sha512_state),
121 .base = {
122 .cra_name = "sha384",
123 .cra_driver_name = "sha384-ssse3",
124 .cra_priority = 150,
125 .cra_blocksize = SHA384_BLOCK_SIZE,
126 .cra_module = THIS_MODULE,
127 }
128 } };
129
register_sha512_ssse3(void)130 static int register_sha512_ssse3(void)
131 {
132 if (boot_cpu_has(X86_FEATURE_SSSE3))
133 return crypto_register_shashes(sha512_ssse3_algs,
134 ARRAY_SIZE(sha512_ssse3_algs));
135 return 0;
136 }
137
unregister_sha512_ssse3(void)138 static void unregister_sha512_ssse3(void)
139 {
140 if (boot_cpu_has(X86_FEATURE_SSSE3))
141 crypto_unregister_shashes(sha512_ssse3_algs,
142 ARRAY_SIZE(sha512_ssse3_algs));
143 }
144
145 asmlinkage void sha512_transform_avx(struct sha512_state *state,
146 const u8 *data, int blocks);
avx_usable(void)147 static bool avx_usable(void)
148 {
149 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
150 if (boot_cpu_has(X86_FEATURE_AVX))
151 pr_info("AVX detected but unusable.\n");
152 return false;
153 }
154
155 return true;
156 }
157
sha512_avx_update(struct shash_desc * desc,const u8 * data,unsigned int len)158 static int sha512_avx_update(struct shash_desc *desc, const u8 *data,
159 unsigned int len)
160 {
161 return sha512_update(desc, data, len, sha512_transform_avx);
162 }
163
sha512_avx_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)164 static int sha512_avx_finup(struct shash_desc *desc, const u8 *data,
165 unsigned int len, u8 *out)
166 {
167 return sha512_finup(desc, data, len, out, sha512_transform_avx);
168 }
169
170 /* Add padding and return the message digest. */
sha512_avx_final(struct shash_desc * desc,u8 * out)171 static int sha512_avx_final(struct shash_desc *desc, u8 *out)
172 {
173 return sha512_avx_finup(desc, NULL, 0, out);
174 }
175
176 static struct shash_alg sha512_avx_algs[] = { {
177 .digestsize = SHA512_DIGEST_SIZE,
178 .init = sha512_base_init,
179 .update = sha512_avx_update,
180 .final = sha512_avx_final,
181 .finup = sha512_avx_finup,
182 .descsize = sizeof(struct sha512_state),
183 .base = {
184 .cra_name = "sha512",
185 .cra_driver_name = "sha512-avx",
186 .cra_priority = 160,
187 .cra_blocksize = SHA512_BLOCK_SIZE,
188 .cra_module = THIS_MODULE,
189 }
190 }, {
191 .digestsize = SHA384_DIGEST_SIZE,
192 .init = sha384_base_init,
193 .update = sha512_avx_update,
194 .final = sha512_avx_final,
195 .finup = sha512_avx_finup,
196 .descsize = sizeof(struct sha512_state),
197 .base = {
198 .cra_name = "sha384",
199 .cra_driver_name = "sha384-avx",
200 .cra_priority = 160,
201 .cra_blocksize = SHA384_BLOCK_SIZE,
202 .cra_module = THIS_MODULE,
203 }
204 } };
205
register_sha512_avx(void)206 static int register_sha512_avx(void)
207 {
208 if (avx_usable())
209 return crypto_register_shashes(sha512_avx_algs,
210 ARRAY_SIZE(sha512_avx_algs));
211 return 0;
212 }
213
unregister_sha512_avx(void)214 static void unregister_sha512_avx(void)
215 {
216 if (avx_usable())
217 crypto_unregister_shashes(sha512_avx_algs,
218 ARRAY_SIZE(sha512_avx_algs));
219 }
220
221 asmlinkage void sha512_transform_rorx(struct sha512_state *state,
222 const u8 *data, int blocks);
223
sha512_avx2_update(struct shash_desc * desc,const u8 * data,unsigned int len)224 static int sha512_avx2_update(struct shash_desc *desc, const u8 *data,
225 unsigned int len)
226 {
227 return sha512_update(desc, data, len, sha512_transform_rorx);
228 }
229
sha512_avx2_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)230 static int sha512_avx2_finup(struct shash_desc *desc, const u8 *data,
231 unsigned int len, u8 *out)
232 {
233 return sha512_finup(desc, data, len, out, sha512_transform_rorx);
234 }
235
236 /* Add padding and return the message digest. */
sha512_avx2_final(struct shash_desc * desc,u8 * out)237 static int sha512_avx2_final(struct shash_desc *desc, u8 *out)
238 {
239 return sha512_avx2_finup(desc, NULL, 0, out);
240 }
241
242 static struct shash_alg sha512_avx2_algs[] = { {
243 .digestsize = SHA512_DIGEST_SIZE,
244 .init = sha512_base_init,
245 .update = sha512_avx2_update,
246 .final = sha512_avx2_final,
247 .finup = sha512_avx2_finup,
248 .descsize = sizeof(struct sha512_state),
249 .base = {
250 .cra_name = "sha512",
251 .cra_driver_name = "sha512-avx2",
252 .cra_priority = 170,
253 .cra_blocksize = SHA512_BLOCK_SIZE,
254 .cra_module = THIS_MODULE,
255 }
256 }, {
257 .digestsize = SHA384_DIGEST_SIZE,
258 .init = sha384_base_init,
259 .update = sha512_avx2_update,
260 .final = sha512_avx2_final,
261 .finup = sha512_avx2_finup,
262 .descsize = sizeof(struct sha512_state),
263 .base = {
264 .cra_name = "sha384",
265 .cra_driver_name = "sha384-avx2",
266 .cra_priority = 170,
267 .cra_blocksize = SHA384_BLOCK_SIZE,
268 .cra_module = THIS_MODULE,
269 }
270 } };
271
avx2_usable(void)272 static bool avx2_usable(void)
273 {
274 if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2) &&
275 boot_cpu_has(X86_FEATURE_BMI2))
276 return true;
277
278 return false;
279 }
280
register_sha512_avx2(void)281 static int register_sha512_avx2(void)
282 {
283 if (avx2_usable())
284 return crypto_register_shashes(sha512_avx2_algs,
285 ARRAY_SIZE(sha512_avx2_algs));
286 return 0;
287 }
288 static const struct x86_cpu_id module_cpu_ids[] = {
289 X86_MATCH_FEATURE(X86_FEATURE_AVX2, NULL),
290 X86_MATCH_FEATURE(X86_FEATURE_AVX, NULL),
291 X86_MATCH_FEATURE(X86_FEATURE_SSSE3, NULL),
292 {}
293 };
294 MODULE_DEVICE_TABLE(x86cpu, module_cpu_ids);
295
unregister_sha512_avx2(void)296 static void unregister_sha512_avx2(void)
297 {
298 if (avx2_usable())
299 crypto_unregister_shashes(sha512_avx2_algs,
300 ARRAY_SIZE(sha512_avx2_algs));
301 }
302
sha512_ssse3_mod_init(void)303 static int __init sha512_ssse3_mod_init(void)
304 {
305 if (!x86_match_cpu(module_cpu_ids))
306 return -ENODEV;
307
308 if (register_sha512_ssse3())
309 goto fail;
310
311 if (register_sha512_avx()) {
312 unregister_sha512_ssse3();
313 goto fail;
314 }
315
316 if (register_sha512_avx2()) {
317 unregister_sha512_avx();
318 unregister_sha512_ssse3();
319 goto fail;
320 }
321
322 return 0;
323 fail:
324 return -ENODEV;
325 }
326
sha512_ssse3_mod_fini(void)327 static void __exit sha512_ssse3_mod_fini(void)
328 {
329 unregister_sha512_avx2();
330 unregister_sha512_avx();
331 unregister_sha512_ssse3();
332 }
333
334 module_init(sha512_ssse3_mod_init);
335 module_exit(sha512_ssse3_mod_fini);
336
337 MODULE_LICENSE("GPL");
338 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
339
340 MODULE_ALIAS_CRYPTO("sha512");
341 MODULE_ALIAS_CRYPTO("sha512-ssse3");
342 MODULE_ALIAS_CRYPTO("sha512-avx");
343 MODULE_ALIAS_CRYPTO("sha512-avx2");
344 MODULE_ALIAS_CRYPTO("sha384");
345 MODULE_ALIAS_CRYPTO("sha384-ssse3");
346 MODULE_ALIAS_CRYPTO("sha384-avx");
347 MODULE_ALIAS_CRYPTO("sha384-avx2");
348