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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 | /* * 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> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/cryptohash.h> #include <linux/types.h> #include <crypto/sha.h> #include <asm/byteorder.h> #include <asm/i387.h> #include <asm/xcr.h> #include <asm/xsave.h> asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data, unsigned int rounds); #ifdef CONFIG_AS_AVX asmlinkage void sha1_transform_avx(u32 *digest, const char *data, unsigned int rounds); #endif static asmlinkage void (*sha1_transform_asm)(u32 *, const char *, unsigned int); static int sha1_ssse3_init(struct shash_desc *desc) { struct sha1_state *sctx = shash_desc_ctx(desc); *sctx = (struct sha1_state){ .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, }; return 0; } static int __sha1_ssse3_update(struct shash_desc *desc, const u8 *data, unsigned int len, unsigned int partial) { struct sha1_state *sctx = shash_desc_ctx(desc); unsigned int done = 0; sctx->count += len; if (partial) { done = SHA1_BLOCK_SIZE - partial; memcpy(sctx->buffer + partial, data, done); sha1_transform_asm(sctx->state, sctx->buffer, 1); } if (len - done >= SHA1_BLOCK_SIZE) { const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; sha1_transform_asm(sctx->state, data + done, rounds); done += rounds * SHA1_BLOCK_SIZE; } memcpy(sctx->buffer, data + done, len - done); return 0; } static int sha1_ssse3_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct sha1_state *sctx = shash_desc_ctx(desc); unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; int res; /* Handle the fast case right here */ if (partial + len < SHA1_BLOCK_SIZE) { sctx->count += len; memcpy(sctx->buffer + partial, data, len); return 0; } if (!irq_fpu_usable()) { res = crypto_sha1_update(desc, data, len); } else { kernel_fpu_begin(); res = __sha1_ssse3_update(desc, data, len, partial); kernel_fpu_end(); } return res; } /* Add padding and return the message digest. */ static int sha1_ssse3_final(struct shash_desc *desc, u8 *out) { struct sha1_state *sctx = shash_desc_ctx(desc); unsigned int i, index, padlen; __be32 *dst = (__be32 *)out; __be64 bits; static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; bits = cpu_to_be64(sctx->count << 3); /* Pad out to 56 mod 64 and append length */ index = sctx->count % SHA1_BLOCK_SIZE; padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); if (!irq_fpu_usable()) { crypto_sha1_update(desc, padding, padlen); crypto_sha1_update(desc, (const u8 *)&bits, sizeof(bits)); } else { kernel_fpu_begin(); /* We need to fill a whole block for __sha1_ssse3_update() */ if (padlen <= 56) { sctx->count += padlen; memcpy(sctx->buffer + index, padding, padlen); } else { __sha1_ssse3_update(desc, padding, padlen, index); } __sha1_ssse3_update(desc, (const u8 *)&bits, sizeof(bits), 56); kernel_fpu_end(); } /* Store state in digest */ for (i = 0; i < 5; i++) dst[i] = cpu_to_be32(sctx->state[i]); /* Wipe context */ memset(sctx, 0, sizeof(*sctx)); return 0; } static int sha1_ssse3_export(struct shash_desc *desc, void *out) { struct sha1_state *sctx = shash_desc_ctx(desc); memcpy(out, sctx, sizeof(*sctx)); return 0; } static int sha1_ssse3_import(struct shash_desc *desc, const void *in) { struct sha1_state *sctx = shash_desc_ctx(desc); memcpy(sctx, in, sizeof(*sctx)); return 0; } static struct shash_alg alg = { .digestsize = SHA1_DIGEST_SIZE, .init = sha1_ssse3_init, .update = sha1_ssse3_update, .final = sha1_ssse3_final, .export = sha1_ssse3_export, .import = sha1_ssse3_import, .descsize = sizeof(struct sha1_state), .statesize = sizeof(struct sha1_state), .base = { .cra_name = "sha1", .cra_driver_name= "sha1-ssse3", .cra_priority = 150, .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = SHA1_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; #ifdef CONFIG_AS_AVX static bool __init avx_usable(void) { u64 xcr0; if (!cpu_has_avx || !cpu_has_osxsave) return false; xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) { pr_info("AVX detected but unusable.\n"); return false; } return true; } #endif static int __init sha1_ssse3_mod_init(void) { /* test for SSSE3 first */ if (cpu_has_ssse3) sha1_transform_asm = sha1_transform_ssse3; #ifdef CONFIG_AS_AVX /* allow AVX to override SSSE3, it's a little faster */ if (avx_usable()) sha1_transform_asm = sha1_transform_avx; #endif if (sha1_transform_asm) { pr_info("Using %s optimized SHA-1 implementation\n", sha1_transform_asm == sha1_transform_ssse3 ? "SSSE3" : "AVX"); return crypto_register_shash(&alg); } pr_info("Neither AVX nor SSSE3 is available/usable.\n"); return -ENODEV; } static void __exit sha1_ssse3_mod_fini(void) { crypto_unregister_shash(&alg); } 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("sha1"); |