drivers/staging/lustre/lustre/libcfs/linux/linux-crypto.c

   1 /* GPL HEADER START
   2  *
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License version 2 for more details (a copy is included
  13  * in the LICENSE file that accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * version 2 along with this program; If not, see http://www.gnu.org/licenses
  17  *
  18  * Please  visit http://www.xyratex.com/contact if you need additional
  19  * information or have any questions.
  20  *
  21  * GPL HEADER END
  22  */
  23
  24 /*
  25  * Copyright 2012 Xyratex Technology Limited
  26  *
  27  * Copyright (c) 2012, Intel Corporation.
  28  */
  29
  30 #include <linux/crypto.h>
  31 #include <linux/scatterlist.h>
  32 #include "../../../include/linux/libcfs/libcfs.h"
  33 #include "linux-crypto.h"
  34 /**
  35  *  Array of  hash algorithm speed in MByte per second
  36  */
  37 static int cfs_crypto_hash_speeds[CFS_HASH_ALG_MAX];
  38
  39 static int cfs_crypto_hash_alloc(unsigned char alg_id,
  40                                  const struct cfs_crypto_hash_type **type,
  41                                  struct hash_desc *desc, unsigned char *key,
  42                                  unsigned int key_len)
  43 {
  44         int     err = 0;
  45
  46         *type = cfs_crypto_hash_type(alg_id);
  47
  48         if (!*type) {
  49                 CWARN("Unsupported hash algorithm id = %d, max id is %d\n",
  50                       alg_id, CFS_HASH_ALG_MAX);
  51                 return -EINVAL;
  52         }
  53         desc->tfm = crypto_alloc_hash((*type)->cht_name, 0, 0);
  54
  55         if (!desc->tfm)
  56                 return -EINVAL;
  57
  58         if (IS_ERR(desc->tfm)) {
  59                 CDEBUG(D_INFO, "Failed to alloc crypto hash %s\n",
  60                        (*type)->cht_name);
  61                 return PTR_ERR(desc->tfm);
  62         }
  63
  64         desc->flags = 0;
  65
  66         /** Shash have different logic for initialization then digest
  67          * shash: crypto_hash_setkey, crypto_hash_init
  68          * digest: crypto_digest_init, crypto_digest_setkey
  69          * Skip this function for digest, because we use shash logic at
  70          * cfs_crypto_hash_alloc.
  71          */
  72         if (key)
  73                 err = crypto_hash_setkey(desc->tfm, key, key_len);
  74         else if ((*type)->cht_key != 0)
  75                 err = crypto_hash_setkey(desc->tfm,
  76                                          (unsigned char *)&((*type)->cht_key),
  77                                          (*type)->cht_size);
  78
  79         if (err != 0) {
  80                 crypto_free_hash(desc->tfm);
  81                 return err;
  82         }
  83
  84         CDEBUG(D_INFO, "Using crypto hash: %s (%s) speed %d MB/s\n",
  85                (crypto_hash_tfm(desc->tfm))->__crt_alg->cra_name,
  86                (crypto_hash_tfm(desc->tfm))->__crt_alg->cra_driver_name,
  87                cfs_crypto_hash_speeds[alg_id]);
  88
  89         return crypto_hash_init(desc);
  90 }
  91
  92 int cfs_crypto_hash_digest(unsigned char alg_id,
  93                            const void *buf, unsigned int buf_len,
  94                            unsigned char *key, unsigned int key_len,
  95                            unsigned char *hash, unsigned int *hash_len)
  96 {
  97         struct scatterlist      sl;
  98         struct hash_desc        hdesc;
  99         int                     err;
 100         const struct cfs_crypto_hash_type       *type;
 101
 102         if (!buf || buf_len == 0 || !hash_len)
 103                 return -EINVAL;
 104
 105         err = cfs_crypto_hash_alloc(alg_id, &type, &hdesc, key, key_len);
 106         if (err != 0)
 107                 return err;
 108
 109         if (!hash || *hash_len < type->cht_size) {
 110                 *hash_len = type->cht_size;
 111                 crypto_free_hash(hdesc.tfm);
 112                 return -ENOSPC;
 113         }
 114         sg_init_one(&sl, buf, buf_len);
 115
 116         hdesc.flags = 0;
 117         err = crypto_hash_digest(&hdesc, &sl, sl.length, hash);
 118         crypto_free_hash(hdesc.tfm);
 119
 120         return err;
 121 }
 122 EXPORT_SYMBOL(cfs_crypto_hash_digest);
 123
 124 struct cfs_crypto_hash_desc *
 125         cfs_crypto_hash_init(unsigned char alg_id,
 126                              unsigned char *key, unsigned int key_len)
 127 {
 128         struct  hash_desc       *hdesc;
 129         int                  err;
 130         const struct cfs_crypto_hash_type       *type;
 131
 132         hdesc = kmalloc(sizeof(*hdesc), 0);
 133         if (!hdesc)
 134                 return ERR_PTR(-ENOMEM);
 135
 136         err = cfs_crypto_hash_alloc(alg_id, &type, hdesc, key, key_len);
 137
 138         if (err) {
 139                 kfree(hdesc);
 140                 return ERR_PTR(err);
 141         }
 142         return (struct cfs_crypto_hash_desc *)hdesc;
 143 }
 144 EXPORT_SYMBOL(cfs_crypto_hash_init);
 145
 146 int cfs_crypto_hash_update_page(struct cfs_crypto_hash_desc *hdesc,
 147                                 struct page *page, unsigned int offset,
 148                                 unsigned int len)
 149 {
 150         struct scatterlist sl;
 151
 152         sg_init_table(&sl, 1);
 153         sg_set_page(&sl, page, len, offset & ~CFS_PAGE_MASK);
 154
 155         return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length);
 156 }
 157 EXPORT_SYMBOL(cfs_crypto_hash_update_page);
 158
 159 int cfs_crypto_hash_update(struct cfs_crypto_hash_desc *hdesc,
 160                            const void *buf, unsigned int buf_len)
 161 {
 162         struct scatterlist sl;
 163
 164         sg_init_one(&sl, buf, buf_len);
 165
 166         return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length);
 167 }
 168 EXPORT_SYMBOL(cfs_crypto_hash_update);
 169
 170 /*      If hash_len pointer is NULL - destroy descriptor. */
 171 int cfs_crypto_hash_final(struct cfs_crypto_hash_desc *hdesc,
 172                           unsigned char *hash, unsigned int *hash_len)
 173 {
 174         int     err;
 175         int     size = crypto_hash_digestsize(((struct hash_desc *)hdesc)->tfm);
 176
 177         if (!hash_len) {
 178                 crypto_free_hash(((struct hash_desc *)hdesc)->tfm);
 179                 kfree(hdesc);
 180                 return 0;
 181         }
 182         if (!hash || *hash_len < size) {
 183                 *hash_len = size;
 184                 return -ENOSPC;
 185         }
 186         err = crypto_hash_final((struct hash_desc *)hdesc, hash);
 187
 188         if (err < 0) {
 189                 /* May be caller can fix error */
 190                 return err;
 191         }
 192         crypto_free_hash(((struct hash_desc *)hdesc)->tfm);
 193         kfree(hdesc);
 194         return err;
 195 }
 196 EXPORT_SYMBOL(cfs_crypto_hash_final);
 197
 198 static void cfs_crypto_performance_test(unsigned char alg_id,
 199                                         const unsigned char *buf,
 200                                         unsigned int buf_len)
 201 {
 202         unsigned long              start, end;
 203         int                          bcount, err = 0;
 204         int                          sec = 1; /* do test only 1 sec */
 205         unsigned char              hash[64];
 206         unsigned int                hash_len = 64;
 207
 208         for (start = jiffies, end = start + sec * HZ, bcount = 0;
 209              time_before(jiffies, end); bcount++) {
 210                 err = cfs_crypto_hash_digest(alg_id, buf, buf_len, NULL, 0,
 211                                              hash, &hash_len);
 212                 if (err)
 213                         break;
 214         }
 215         end = jiffies;
 216
 217         if (err) {
 218                 cfs_crypto_hash_speeds[alg_id] =  -1;
 219                 CDEBUG(D_INFO, "Crypto hash algorithm %s, err = %d\n",
 220                        cfs_crypto_hash_name(alg_id), err);
 221         } else {
 222                 unsigned long   tmp;
 223
 224                 tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) *
 225                        1000) / (1024 * 1024);
 226                 cfs_crypto_hash_speeds[alg_id] = (int)tmp;
 227         }
 228         CDEBUG(D_INFO, "Crypto hash algorithm %s speed = %d MB/s\n",
 229                cfs_crypto_hash_name(alg_id), cfs_crypto_hash_speeds[alg_id]);
 230 }
 231
 232 int cfs_crypto_hash_speed(unsigned char hash_alg)
 233 {
 234         if (hash_alg < CFS_HASH_ALG_MAX)
 235                 return cfs_crypto_hash_speeds[hash_alg];
 236         else
 237                 return -1;
 238 }
 239 EXPORT_SYMBOL(cfs_crypto_hash_speed);
 240
 241 /**
 242  * Do performance test for all hash algorithms.
 243  */
 244 static int cfs_crypto_test_hashes(void)
 245 {
 246         unsigned char      i;
 247         unsigned char      *data;
 248         unsigned int        j;
 249         /* Data block size for testing hash. Maximum
 250          * kmalloc size for 2.6.18 kernel is 128K
 251          */
 252         unsigned int        data_len = 1 * 128 * 1024;
 253
 254         data = kmalloc(data_len, 0);
 255         if (!data) {
 256                 CERROR("Failed to allocate mem\n");
 257                 return -ENOMEM;
 258         }
 259
 260         for (j = 0; j < data_len; j++)
 261                 data[j] = j & 0xff;
 262
 263         for (i = 0; i < CFS_HASH_ALG_MAX; i++)
 264                 cfs_crypto_performance_test(i, data, data_len);
 265
 266         kfree(data);
 267         return 0;
 268 }
 269
 270 static int adler32;
 271
 272 int cfs_crypto_register(void)
 273 {
 274         request_module("crc32c");
 275
 276         adler32 = cfs_crypto_adler32_register();
 277
 278         /* check all algorithms and do performance test */
 279         cfs_crypto_test_hashes();
 280         return 0;
 281 }
 282
 283 void cfs_crypto_unregister(void)
 284 {
 285         if (adler32 == 0)
 286                 cfs_crypto_adler32_unregister();
 287 }