1 /* 2 * Cryptographic API. 3 * 4 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using 5 * Supplemental SSE3 instructions. 6 * 7 * This file is based on sha1_generic.c 8 * 9 * Copyright (c) Alan Smithee. 10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 12 * Copyright (c) Mathias Krause <minipli@googlemail.com> 13 * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com> 14 * 15 * This program is free software; you can redistribute it and/or modify it 16 * under the terms of the GNU General Public License as published by the Free 17 * Software Foundation; either version 2 of the License, or (at your option) 18 * any later version. 19 * 20 */ 21 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <crypto/internal/hash.h> 25 #include <linux/init.h> 26 #include <linux/module.h> 27 #include <linux/mm.h> 28 #include <linux/cryptohash.h> 29 #include <linux/types.h> 30 #include <crypto/sha.h> 31 #include <crypto/sha1_base.h> 32 #include <asm/fpu/api.h> 33 34 35 asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data, 36 unsigned int rounds); 37 #ifdef CONFIG_AS_AVX 38 asmlinkage void sha1_transform_avx(u32 *digest, const char *data, 39 unsigned int rounds); 40 #endif 41 #ifdef CONFIG_AS_AVX2 42 #define SHA1_AVX2_BLOCK_OPTSIZE 4 /* optimal 4*64 bytes of SHA1 blocks */ 43 44 asmlinkage void sha1_transform_avx2(u32 *digest, const char *data, 45 unsigned int rounds); 46 #endif 47 48 static void (*sha1_transform_asm)(u32 *, const char *, unsigned int); 49 50 static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data, 51 unsigned int len) 52 { 53 struct sha1_state *sctx = shash_desc_ctx(desc); 54 55 if (!irq_fpu_usable() || 56 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 57 return crypto_sha1_update(desc, data, len); 58 59 /* make sure casting to sha1_block_fn() is safe */ 60 BUILD_BUG_ON(offsetof(struct sha1_state, state) != 0); 61 62 kernel_fpu_begin(); 63 sha1_base_do_update(desc, data, len, 64 (sha1_block_fn *)sha1_transform_asm); 65 kernel_fpu_end(); 66 67 return 0; 68 } 69 70 static int sha1_ssse3_finup(struct shash_desc *desc, const u8 *data, 71 unsigned int len, u8 *out) 72 { 73 if (!irq_fpu_usable()) 74 return crypto_sha1_finup(desc, data, len, out); 75 76 kernel_fpu_begin(); 77 if (len) 78 sha1_base_do_update(desc, data, len, 79 (sha1_block_fn *)sha1_transform_asm); 80 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_asm); 81 kernel_fpu_end(); 82 83 return sha1_base_finish(desc, out); 84 } 85 86 /* Add padding and return the message digest. */ 87 static int sha1_ssse3_final(struct shash_desc *desc, u8 *out) 88 { 89 return sha1_ssse3_finup(desc, NULL, 0, out); 90 } 91 92 #ifdef CONFIG_AS_AVX2 93 static void sha1_apply_transform_avx2(u32 *digest, const char *data, 94 unsigned int rounds) 95 { 96 /* Select the optimal transform based on data block size */ 97 if (rounds >= SHA1_AVX2_BLOCK_OPTSIZE) 98 sha1_transform_avx2(digest, data, rounds); 99 else 100 sha1_transform_avx(digest, data, rounds); 101 } 102 #endif 103 104 static struct shash_alg alg = { 105 .digestsize = SHA1_DIGEST_SIZE, 106 .init = sha1_base_init, 107 .update = sha1_ssse3_update, 108 .final = sha1_ssse3_final, 109 .finup = sha1_ssse3_finup, 110 .descsize = sizeof(struct sha1_state), 111 .base = { 112 .cra_name = "sha1", 113 .cra_driver_name= "sha1-ssse3", 114 .cra_priority = 150, 115 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 116 .cra_blocksize = SHA1_BLOCK_SIZE, 117 .cra_module = THIS_MODULE, 118 } 119 }; 120 121 #ifdef CONFIG_AS_AVX 122 static bool __init avx_usable(void) 123 { 124 if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) { 125 if (cpu_has_avx) 126 pr_info("AVX detected but unusable.\n"); 127 return false; 128 } 129 130 return true; 131 } 132 133 #ifdef CONFIG_AS_AVX2 134 static bool __init avx2_usable(void) 135 { 136 if (avx_usable() && cpu_has_avx2 && boot_cpu_has(X86_FEATURE_BMI1) && 137 boot_cpu_has(X86_FEATURE_BMI2)) 138 return true; 139 140 return false; 141 } 142 #endif 143 #endif 144 145 static int __init sha1_ssse3_mod_init(void) 146 { 147 char *algo_name; 148 149 /* test for SSSE3 first */ 150 if (cpu_has_ssse3) { 151 sha1_transform_asm = sha1_transform_ssse3; 152 algo_name = "SSSE3"; 153 } 154 155 #ifdef CONFIG_AS_AVX 156 /* allow AVX to override SSSE3, it's a little faster */ 157 if (avx_usable()) { 158 sha1_transform_asm = sha1_transform_avx; 159 algo_name = "AVX"; 160 #ifdef CONFIG_AS_AVX2 161 /* allow AVX2 to override AVX, it's a little faster */ 162 if (avx2_usable()) { 163 sha1_transform_asm = sha1_apply_transform_avx2; 164 algo_name = "AVX2"; 165 } 166 #endif 167 } 168 #endif 169 170 if (sha1_transform_asm) { 171 pr_info("Using %s optimized SHA-1 implementation\n", algo_name); 172 return crypto_register_shash(&alg); 173 } 174 pr_info("Neither AVX nor AVX2 nor SSSE3 is available/usable.\n"); 175 176 return -ENODEV; 177 } 178 179 static void __exit sha1_ssse3_mod_fini(void) 180 { 181 crypto_unregister_shash(&alg); 182 } 183 184 module_init(sha1_ssse3_mod_init); 185 module_exit(sha1_ssse3_mod_fini); 186 187 MODULE_LICENSE("GPL"); 188 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, Supplemental SSE3 accelerated"); 189 190 MODULE_ALIAS_CRYPTO("sha1"); 191