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Linux/arch/x86/crypto/sha512_ssse3_glue.c

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  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 <linux/init.h>
 32 #include <linux/module.h>
 33 #include <linux/mm.h>
 34 #include <linux/cryptohash.h>
 35 #include <linux/types.h>
 36 #include <crypto/sha.h>
 37 #include <crypto/sha512_base.h>
 38 #include <asm/fpu/api.h>
 39 
 40 #include <linux/string.h>
 41 
 42 asmlinkage void sha512_transform_ssse3(u64 *digest, const char *data,
 43                                        u64 rounds);
 44 
 45 typedef void (sha512_transform_fn)(u64 *digest, const char *data, u64 rounds);
 46 
 47 static int sha512_update(struct shash_desc *desc, const u8 *data,
 48                        unsigned int len, sha512_transform_fn *sha512_xform)
 49 {
 50         struct sha512_state *sctx = shash_desc_ctx(desc);
 51 
 52         if (!irq_fpu_usable() ||
 53             (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
 54                 return crypto_sha512_update(desc, data, len);
 55 
 56         /* make sure casting to sha512_block_fn() is safe */
 57         BUILD_BUG_ON(offsetof(struct sha512_state, state) != 0);
 58 
 59         kernel_fpu_begin();
 60         sha512_base_do_update(desc, data, len,
 61                               (sha512_block_fn *)sha512_xform);
 62         kernel_fpu_end();
 63 
 64         return 0;
 65 }
 66 
 67 static int sha512_finup(struct shash_desc *desc, const u8 *data,
 68               unsigned int len, u8 *out, sha512_transform_fn *sha512_xform)
 69 {
 70         if (!irq_fpu_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,
 76                                       (sha512_block_fn *)sha512_xform);
 77         sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_xform);
 78         kernel_fpu_end();
 79 
 80         return sha512_base_finish(desc, out);
 81 }
 82 
 83 static int sha512_ssse3_update(struct shash_desc *desc, const u8 *data,
 84                        unsigned int len)
 85 {
 86         return sha512_update(desc, data, len, sha512_transform_ssse3);
 87 }
 88 
 89 static int sha512_ssse3_finup(struct shash_desc *desc, const u8 *data,
 90               unsigned int len, u8 *out)
 91 {
 92         return sha512_finup(desc, data, len, out, sha512_transform_ssse3);
 93 }
 94 
 95 /* Add padding and return the message digest. */
 96 static int sha512_ssse3_final(struct shash_desc *desc, u8 *out)
 97 {
 98         return sha512_ssse3_finup(desc, NULL, 0, out);
 99 }
100 
101 static struct shash_alg sha512_ssse3_algs[] = { {
102         .digestsize     =       SHA512_DIGEST_SIZE,
103         .init           =       sha512_base_init,
104         .update         =       sha512_ssse3_update,
105         .final          =       sha512_ssse3_final,
106         .finup          =       sha512_ssse3_finup,
107         .descsize       =       sizeof(struct sha512_state),
108         .base           =       {
109                 .cra_name       =       "sha512",
110                 .cra_driver_name =      "sha512-ssse3",
111                 .cra_priority   =       150,
112                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
113                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
114                 .cra_module     =       THIS_MODULE,
115         }
116 },  {
117         .digestsize     =       SHA384_DIGEST_SIZE,
118         .init           =       sha384_base_init,
119         .update         =       sha512_ssse3_update,
120         .final          =       sha512_ssse3_final,
121         .finup          =       sha512_ssse3_finup,
122         .descsize       =       sizeof(struct sha512_state),
123         .base           =       {
124                 .cra_name       =       "sha384",
125                 .cra_driver_name =      "sha384-ssse3",
126                 .cra_priority   =       150,
127                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
128                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
129                 .cra_module     =       THIS_MODULE,
130         }
131 } };
132 
133 static int register_sha512_ssse3(void)
134 {
135         if (boot_cpu_has(X86_FEATURE_SSSE3))
136                 return crypto_register_shashes(sha512_ssse3_algs,
137                         ARRAY_SIZE(sha512_ssse3_algs));
138         return 0;
139 }
140 
141 static void unregister_sha512_ssse3(void)
142 {
143         if (boot_cpu_has(X86_FEATURE_SSSE3))
144                 crypto_unregister_shashes(sha512_ssse3_algs,
145                         ARRAY_SIZE(sha512_ssse3_algs));
146 }
147 
148 #ifdef CONFIG_AS_AVX
149 asmlinkage void sha512_transform_avx(u64 *digest, const char *data,
150                                      u64 rounds);
151 static bool avx_usable(void)
152 {
153         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
154                 if (boot_cpu_has(X86_FEATURE_AVX))
155                         pr_info("AVX detected but unusable.\n");
156                 return false;
157         }
158 
159         return true;
160 }
161 
162 static int sha512_avx_update(struct shash_desc *desc, const u8 *data,
163                        unsigned int len)
164 {
165         return sha512_update(desc, data, len, sha512_transform_avx);
166 }
167 
168 static int sha512_avx_finup(struct shash_desc *desc, const u8 *data,
169               unsigned int len, u8 *out)
170 {
171         return sha512_finup(desc, data, len, out, sha512_transform_avx);
172 }
173 
174 /* Add padding and return the message digest. */
175 static int sha512_avx_final(struct shash_desc *desc, u8 *out)
176 {
177         return sha512_avx_finup(desc, NULL, 0, out);
178 }
179 
180 static struct shash_alg sha512_avx_algs[] = { {
181         .digestsize     =       SHA512_DIGEST_SIZE,
182         .init           =       sha512_base_init,
183         .update         =       sha512_avx_update,
184         .final          =       sha512_avx_final,
185         .finup          =       sha512_avx_finup,
186         .descsize       =       sizeof(struct sha512_state),
187         .base           =       {
188                 .cra_name       =       "sha512",
189                 .cra_driver_name =      "sha512-avx",
190                 .cra_priority   =       160,
191                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
192                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
193                 .cra_module     =       THIS_MODULE,
194         }
195 },  {
196         .digestsize     =       SHA384_DIGEST_SIZE,
197         .init           =       sha384_base_init,
198         .update         =       sha512_avx_update,
199         .final          =       sha512_avx_final,
200         .finup          =       sha512_avx_finup,
201         .descsize       =       sizeof(struct sha512_state),
202         .base           =       {
203                 .cra_name       =       "sha384",
204                 .cra_driver_name =      "sha384-avx",
205                 .cra_priority   =       160,
206                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
207                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
208                 .cra_module     =       THIS_MODULE,
209         }
210 } };
211 
212 static int register_sha512_avx(void)
213 {
214         if (avx_usable())
215                 return crypto_register_shashes(sha512_avx_algs,
216                         ARRAY_SIZE(sha512_avx_algs));
217         return 0;
218 }
219 
220 static void unregister_sha512_avx(void)
221 {
222         if (avx_usable())
223                 crypto_unregister_shashes(sha512_avx_algs,
224                         ARRAY_SIZE(sha512_avx_algs));
225 }
226 #else
227 static inline int register_sha512_avx(void) { return 0; }
228 static inline void unregister_sha512_avx(void) { }
229 #endif
230 
231 #if defined(CONFIG_AS_AVX2) && defined(CONFIG_AS_AVX)
232 asmlinkage void sha512_transform_rorx(u64 *digest, const char *data,
233                                       u64 rounds);
234 
235 static int sha512_avx2_update(struct shash_desc *desc, const u8 *data,
236                        unsigned int len)
237 {
238         return sha512_update(desc, data, len, sha512_transform_rorx);
239 }
240 
241 static int sha512_avx2_finup(struct shash_desc *desc, const u8 *data,
242               unsigned int len, u8 *out)
243 {
244         return sha512_finup(desc, data, len, out, sha512_transform_rorx);
245 }
246 
247 /* Add padding and return the message digest. */
248 static int sha512_avx2_final(struct shash_desc *desc, u8 *out)
249 {
250         return sha512_avx2_finup(desc, NULL, 0, out);
251 }
252 
253 static struct shash_alg sha512_avx2_algs[] = { {
254         .digestsize     =       SHA512_DIGEST_SIZE,
255         .init           =       sha512_base_init,
256         .update         =       sha512_avx2_update,
257         .final          =       sha512_avx2_final,
258         .finup          =       sha512_avx2_finup,
259         .descsize       =       sizeof(struct sha512_state),
260         .base           =       {
261                 .cra_name       =       "sha512",
262                 .cra_driver_name =      "sha512-avx2",
263                 .cra_priority   =       170,
264                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
265                 .cra_blocksize  =       SHA512_BLOCK_SIZE,
266                 .cra_module     =       THIS_MODULE,
267         }
268 },  {
269         .digestsize     =       SHA384_DIGEST_SIZE,
270         .init           =       sha384_base_init,
271         .update         =       sha512_avx2_update,
272         .final          =       sha512_avx2_final,
273         .finup          =       sha512_avx2_finup,
274         .descsize       =       sizeof(struct sha512_state),
275         .base           =       {
276                 .cra_name       =       "sha384",
277                 .cra_driver_name =      "sha384-avx2",
278                 .cra_priority   =       170,
279                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
280                 .cra_blocksize  =       SHA384_BLOCK_SIZE,
281                 .cra_module     =       THIS_MODULE,
282         }
283 } };
284 
285 static bool avx2_usable(void)
286 {
287         if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2) &&
288                     boot_cpu_has(X86_FEATURE_BMI2))
289                 return true;
290 
291         return false;
292 }
293 
294 static int register_sha512_avx2(void)
295 {
296         if (avx2_usable())
297                 return crypto_register_shashes(sha512_avx2_algs,
298                         ARRAY_SIZE(sha512_avx2_algs));
299         return 0;
300 }
301 
302 static void unregister_sha512_avx2(void)
303 {
304         if (avx2_usable())
305                 crypto_unregister_shashes(sha512_avx2_algs,
306                         ARRAY_SIZE(sha512_avx2_algs));
307 }
308 #else
309 static inline int register_sha512_avx2(void) { return 0; }
310 static inline void unregister_sha512_avx2(void) { }
311 #endif
312 
313 static int __init sha512_ssse3_mod_init(void)
314 {
315 
316         if (register_sha512_ssse3())
317                 goto fail;
318 
319         if (register_sha512_avx()) {
320                 unregister_sha512_ssse3();
321                 goto fail;
322         }
323 
324         if (register_sha512_avx2()) {
325                 unregister_sha512_avx();
326                 unregister_sha512_ssse3();
327                 goto fail;
328         }
329 
330         return 0;
331 fail:
332         return -ENODEV;
333 }
334 
335 static void __exit sha512_ssse3_mod_fini(void)
336 {
337         unregister_sha512_avx2();
338         unregister_sha512_avx();
339         unregister_sha512_ssse3();
340 }
341 
342 module_init(sha512_ssse3_mod_init);
343 module_exit(sha512_ssse3_mod_fini);
344 
345 MODULE_LICENSE("GPL");
346 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, Supplemental SSE3 accelerated");
347 
348 MODULE_ALIAS_CRYPTO("sha512");
349 MODULE_ALIAS_CRYPTO("sha512-ssse3");
350 MODULE_ALIAS_CRYPTO("sha512-avx");
351 MODULE_ALIAS_CRYPTO("sha512-avx2");
352 MODULE_ALIAS_CRYPTO("sha384");
353 MODULE_ALIAS_CRYPTO("sha384-ssse3");
354 MODULE_ALIAS_CRYPTO("sha384-avx");
355 MODULE_ALIAS_CRYPTO("sha384-avx2");
356 

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