arch/arm/crypto/sha512_neon_glue.c

   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
  31 static 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
  75 asmlinkage void sha512_transform_neon(u64 *digest, const void *data,
  76                                       const u64 k[], unsigned int num_blks);
  77
  78
  79 static 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
  96 static 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
 126 static 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. */
 156 static 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
 201 static 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
 210 static 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
 219 static 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
 237 static 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
 249 static 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
 285 static 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
 293 static void __exit sha512_neon_mod_fini(void)
 294 {
 295         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 296 }
 297
 298 module_init(sha512_neon_mod_init);
 299 module_exit(sha512_neon_mod_fini);
 300
 301 MODULE_LICENSE("GPL");
 302 MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, NEON accelerated");
 303
 304 MODULE_ALIAS_CRYPTO("sha512");
 305 MODULE_ALIAS_CRYPTO("sha384");