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 == NULL) {
  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 == NULL)
  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 != NULL)
  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 == NULL || buf_len == 0 || hash_len == NULL)
 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 == NULL || *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
 129         struct  hash_desc       *hdesc;
 130         int                  err;
 131         const struct cfs_crypto_hash_type       *type;
 132
 133         hdesc = kmalloc(sizeof(*hdesc), 0);
 134         if (hdesc == NULL)
 135                 return ERR_PTR(-ENOMEM);
 136
 137         err = cfs_crypto_hash_alloc(alg_id, &type, hdesc, key, key_len);
 138
 139         if (err) {
 140                 kfree(hdesc);
 141                 return ERR_PTR(err);
 142         }
 143         return (struct cfs_crypto_hash_desc *)hdesc;
 144 }
 145 EXPORT_SYMBOL(cfs_crypto_hash_init);
 146
 147 int cfs_crypto_hash_update_page(struct cfs_crypto_hash_desc *hdesc,
 148                                 struct page *page, unsigned int offset,
 149                                 unsigned int len)
 150 {
 151         struct scatterlist sl;
 152
 153         sg_init_table(&sl, 1);
 154         sg_set_page(&sl, page, len, offset & ~CFS_PAGE_MASK);
 155
 156         return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length);
 157 }
 158 EXPORT_SYMBOL(cfs_crypto_hash_update_page);
 159
 160 int cfs_crypto_hash_update(struct cfs_crypto_hash_desc *hdesc,
 161                            const void *buf, unsigned int buf_len)
 162 {
 163         struct scatterlist sl;
 164
 165         sg_init_one(&sl, buf, buf_len);
 166
 167         return crypto_hash_update((struct hash_desc *)hdesc, &sl, sl.length);
 168 }
 169 EXPORT_SYMBOL(cfs_crypto_hash_update);
 170
 171 /*      If hash_len pointer is NULL - destroy descriptor. */
 172 int cfs_crypto_hash_final(struct cfs_crypto_hash_desc *hdesc,
 173                           unsigned char *hash, unsigned int *hash_len)
 174 {
 175         int     err;
 176         int     size = crypto_hash_digestsize(((struct hash_desc *)hdesc)->tfm);
 177
 178         if (hash_len == NULL) {
 179                 crypto_free_hash(((struct hash_desc *)hdesc)->tfm);
 180                 kfree(hdesc);
 181                 return 0;
 182         }
 183         if (hash == NULL || *hash_len < size) {
 184                 *hash_len = size;
 185                 return -ENOSPC;
 186         }
 187         err = crypto_hash_final((struct hash_desc *) hdesc, hash);
 188
 189         if (err < 0) {
 190                 /* May be caller can fix error */
 191                 return err;
 192         }
 193         crypto_free_hash(((struct hash_desc *)hdesc)->tfm);
 194         kfree(hdesc);
 195         return err;
 196 }
 197 EXPORT_SYMBOL(cfs_crypto_hash_final);
 198
 199 static void cfs_crypto_performance_test(unsigned char alg_id,
 200                                         const unsigned char *buf,
 201                                         unsigned int buf_len)
 202 {
 203         unsigned long              start, end;
 204         int                          bcount, err = 0;
 205         int                          sec = 1; /* do test only 1 sec */
 206         unsigned char              hash[64];
 207         unsigned int                hash_len = 64;
 208
 209         for (start = jiffies, end = start + sec * HZ, bcount = 0;
 210              time_before(jiffies, end); bcount++) {
 211                 err = cfs_crypto_hash_digest(alg_id, buf, buf_len, NULL, 0,
 212                                              hash, &hash_len);
 213                 if (err)
 214                         break;
 215
 216         }
 217         end = jiffies;
 218
 219         if (err) {
 220                 cfs_crypto_hash_speeds[alg_id] =  -1;
 221                 CDEBUG(D_INFO, "Crypto hash algorithm %s, err = %d\n",
 222                        cfs_crypto_hash_name(alg_id), err);
 223         } else {
 224                 unsigned long   tmp;
 225
 226                 tmp = ((bcount * buf_len / jiffies_to_msecs(end - start)) *
 227                        1000) / (1024 * 1024);
 228                 cfs_crypto_hash_speeds[alg_id] = (int)tmp;
 229         }
 230         CDEBUG(D_INFO, "Crypto hash algorithm %s speed = %d MB/s\n",
 231                cfs_crypto_hash_name(alg_id), cfs_crypto_hash_speeds[alg_id]);
 232 }
 233
 234 int cfs_crypto_hash_speed(unsigned char hash_alg)
 235 {
 236         if (hash_alg < CFS_HASH_ALG_MAX)
 237                 return cfs_crypto_hash_speeds[hash_alg];
 238         else
 239                 return -1;
 240 }
 241 EXPORT_SYMBOL(cfs_crypto_hash_speed);
 242
 243 /**
 244  * Do performance test for all hash algorithms.
 245  */
 246 static int cfs_crypto_test_hashes(void)
 247 {
 248         unsigned char      i;
 249         unsigned char      *data;
 250         unsigned int        j;
 251         /* Data block size for testing hash. Maximum
 252          * kmalloc size for 2.6.18 kernel is 128K */
 253         unsigned int        data_len = 1 * 128 * 1024;
 254
 255         data = kmalloc(data_len, 0);
 256         if (data == NULL) {
 257                 CERROR("Failed to allocate mem\n");
 258                 return -ENOMEM;
 259         }
 260
 261         for (j = 0; j < data_len; j++)
 262                 data[j] = j & 0xff;
 263
 264         for (i = 0; i < CFS_HASH_ALG_MAX; i++)
 265                 cfs_crypto_performance_test(i, data, data_len);
 266
 267         kfree(data);
 268         return 0;
 269 }
 270
 271 static int adler32;
 272
 273 int cfs_crypto_register(void)
 274 {
 275         request_module("crc32c");
 276
 277         adler32 = cfs_crypto_adler32_register();
 278
 279         /* check all algorithms and do performance test */
 280         cfs_crypto_test_hashes();
 281         return 0;
 282 }
 283
 284 void cfs_crypto_unregister(void)
 285 {
 286         if (adler32 == 0)
 287                 cfs_crypto_adler32_unregister();
 288
 289         return;
 290 }