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