1/* 2 * Glue code for the SHA512 Secure Hash Algorithm assembly implementation 3 * using NEON instructions. 4 * 5 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> 6 * 7 * This file is based on sha512_ssse3_glue.c: 8 * Copyright (C) 2013 Intel Corporation 9 * Author: Tim Chen <tim.c.chen@linux.intel.com> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the Free 13 * Software Foundation; either version 2 of the License, or (at your option) 14 * any later version. 15 * 16 */ 17 18#include <crypto/internal/hash.h> 19#include <linux/init.h> 20#include <linux/module.h> 21#include <linux/mm.h> 22#include <linux/cryptohash.h> 23#include <linux/types.h> 24#include <linux/string.h> 25#include <crypto/sha.h> 26#include <asm/byteorder.h> 27#include <asm/simd.h> 28#include <asm/neon.h> 29 30 31static const u64 sha512_k[] = { 32 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 33 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL, 34 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 35 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 36 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 37 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL, 38 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 39 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL, 40 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 41 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 42 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 43 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL, 44 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 45 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL, 46 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 47 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 48 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 49 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL, 50 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 51 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL, 52 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 53 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 54 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 55 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL, 56 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 57 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL, 58 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 59 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 60 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 61 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL, 62 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 63 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL, 64 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 65 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 66 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 67 0x113f9804bef90daeULL, 0x1b710b35131c471bULL, 68 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 69 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL, 70 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 71 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL 72}; 73 74 75asmlinkage void sha512_transform_neon(u64 *digest, const void *data, 76 const u64 k[], unsigned int num_blks); 77 78 79static int sha512_neon_init(struct shash_desc *desc) 80{ 81 struct sha512_state *sctx = shash_desc_ctx(desc); 82 83 sctx->state[0] = SHA512_H0; 84 sctx->state[1] = SHA512_H1; 85 sctx->state[2] = SHA512_H2; 86 sctx->state[3] = SHA512_H3; 87 sctx->state[4] = SHA512_H4; 88 sctx->state[5] = SHA512_H5; 89 sctx->state[6] = SHA512_H6; 90 sctx->state[7] = SHA512_H7; 91 sctx->count[0] = sctx->count[1] = 0; 92 93 return 0; 94} 95 96static int __sha512_neon_update(struct shash_desc *desc, const u8 *data, 97 unsigned int len, unsigned int partial) 98{ 99 struct sha512_state *sctx = shash_desc_ctx(desc); 100 unsigned int done = 0; 101 102 sctx->count[0] += len; 103 if (sctx->count[0] < len) 104 sctx->count[1]++; 105 106 if (partial) { 107 done = SHA512_BLOCK_SIZE - partial; 108 memcpy(sctx->buf + partial, data, done); 109 sha512_transform_neon(sctx->state, sctx->buf, sha512_k, 1); 110 } 111 112 if (len - done >= SHA512_BLOCK_SIZE) { 113 const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE; 114 115 sha512_transform_neon(sctx->state, data + done, sha512_k, 116 rounds); 117 118 done += rounds * SHA512_BLOCK_SIZE; 119 } 120 121 memcpy(sctx->buf, data + done, len - done); 122 123 return 0; 124} 125 126static int sha512_neon_update(struct shash_desc *desc, const u8 *data, 127 unsigned int len) 128{ 129 struct sha512_state *sctx = shash_desc_ctx(desc); 130 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 131 int res; 132 133 /* Handle the fast case right here */ 134 if (partial + len < SHA512_BLOCK_SIZE) { 135 sctx->count[0] += len; 136 if (sctx->count[0] < len) 137 sctx->count[1]++; 138 memcpy(sctx->buf + partial, data, len); 139 140 return 0; 141 } 142 143 if (!may_use_simd()) { 144 res = crypto_sha512_update(desc, data, len); 145 } else { 146 kernel_neon_begin(); 147 res = __sha512_neon_update(desc, data, len, partial); 148 kernel_neon_end(); 149 } 150 151 return res; 152} 153 154 155/* Add padding and return the message digest. */ 156static int sha512_neon_final(struct shash_desc *desc, u8 *out) 157{ 158 struct sha512_state *sctx = shash_desc_ctx(desc); 159 unsigned int i, index, padlen; 160 __be64 *dst = (__be64 *)out; 161 __be64 bits[2]; 162 static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, }; 163 164 /* save number of bits */ 165 bits[1] = cpu_to_be64(sctx->count[0] << 3); 166 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); 167 168 /* Pad out to 112 mod 128 and append length */ 169 index = sctx->count[0] & 0x7f; 170 padlen = (index < 112) ? (112 - index) : ((128+112) - index); 171 172 if (!may_use_simd()) { 173 crypto_sha512_update(desc, padding, padlen); 174 crypto_sha512_update(desc, (const u8 *)&bits, sizeof(bits)); 175 } else { 176 kernel_neon_begin(); 177 /* We need to fill a whole block for __sha512_neon_update() */ 178 if (padlen <= 112) { 179 sctx->count[0] += padlen; 180 if (sctx->count[0] < padlen) 181 sctx->count[1]++; 182 memcpy(sctx->buf + index, padding, padlen); 183 } else { 184 __sha512_neon_update(desc, padding, padlen, index); 185 } 186 __sha512_neon_update(desc, (const u8 *)&bits, 187 sizeof(bits), 112); 188 kernel_neon_end(); 189 } 190 191 /* Store state in digest */ 192 for (i = 0; i < 8; i++) 193 dst[i] = cpu_to_be64(sctx->state[i]); 194 195 /* Wipe context */ 196 memset(sctx, 0, sizeof(*sctx)); 197 198 return 0; 199} 200 201static int sha512_neon_export(struct shash_desc *desc, void *out) 202{ 203 struct sha512_state *sctx = shash_desc_ctx(desc); 204 205 memcpy(out, sctx, sizeof(*sctx)); 206 207 return 0; 208} 209 210static int sha512_neon_import(struct shash_desc *desc, const void *in) 211{ 212 struct sha512_state *sctx = shash_desc_ctx(desc); 213 214 memcpy(sctx, in, sizeof(*sctx)); 215 216 return 0; 217} 218 219static int sha384_neon_init(struct shash_desc *desc) 220{ 221 struct sha512_state *sctx = shash_desc_ctx(desc); 222 223 sctx->state[0] = SHA384_H0; 224 sctx->state[1] = SHA384_H1; 225 sctx->state[2] = SHA384_H2; 226 sctx->state[3] = SHA384_H3; 227 sctx->state[4] = SHA384_H4; 228 sctx->state[5] = SHA384_H5; 229 sctx->state[6] = SHA384_H6; 230 sctx->state[7] = SHA384_H7; 231 232 sctx->count[0] = sctx->count[1] = 0; 233 234 return 0; 235} 236 237static int sha384_neon_final(struct shash_desc *desc, u8 *hash) 238{ 239 u8 D[SHA512_DIGEST_SIZE]; 240 241 sha512_neon_final(desc, D); 242 243 memcpy(hash, D, SHA384_DIGEST_SIZE); 244 memzero_explicit(D, SHA512_DIGEST_SIZE); 245 246 return 0; 247} 248 249static struct shash_alg algs[] = { { 250 .digestsize = SHA512_DIGEST_SIZE, 251 .init = sha512_neon_init, 252 .update = sha512_neon_update, 253 .final = sha512_neon_final, 254 .export = sha512_neon_export, 255 .import = sha512_neon_import, 256 .descsize = sizeof(struct sha512_state), 257 .statesize = sizeof(struct sha512_state), 258 .base = { 259 .cra_name = "sha512", 260 .cra_driver_name = "sha512-neon", 261 .cra_priority = 250, 262 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 263 .cra_blocksize = SHA512_BLOCK_SIZE, 264 .cra_module = THIS_MODULE, 265 } 266}, { 267 .digestsize = SHA384_DIGEST_SIZE, 268 .init = sha384_neon_init, 269 .update = sha512_neon_update, 270 .final = sha384_neon_final, 271 .export = sha512_neon_export, 272 .import = sha512_neon_import, 273 .descsize = sizeof(struct sha512_state), 274 .statesize = sizeof(struct sha512_state), 275 .base = { 276 .cra_name = "sha384", 277 .cra_driver_name = "sha384-neon", 278 .cra_priority = 250, 279 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 280 .cra_blocksize = SHA384_BLOCK_SIZE, 281 .cra_module = THIS_MODULE, 282 } 283} }; 284 285static int __init sha512_neon_mod_init(void) 286{ 287 if (!cpu_has_neon()) 288 return -ENODEV; 289 290 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 291} 292 293static void __exit sha512_neon_mod_fini(void) 294{ 295 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 296} 297 298module_init(sha512_neon_mod_init); 299module_exit(sha512_neon_mod_fini); 300 301MODULE_LICENSE("GPL"); 302MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, NEON accelerated"); 303 304MODULE_ALIAS_CRYPTO("sha512"); 305MODULE_ALIAS_CRYPTO("sha384"); 306