LXR linux/arch/powerpc/crypto/crc-vpmsum

   1/*
   2 * CRC vpmsum tester
   3 * Copyright 2017 Daniel Axtens, IBM Corporation.
   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 as
   7 * published by the Free Software Foundation.
   8 */
   9
  10#include <linux/crc-t10dif.h>
  11#include <linux/crc32.h>
  12#include <crypto/internal/hash.h>
  13#include <linux/init.h>
  14#include <linux/module.h>
  15#include <linux/string.h>
  16#include <linux/kernel.h>
  17#include <linux/cpufeature.h>
  18#include <asm/switch_to.h>
  19
  20static unsigned long iterations = 10000;
  21
  22#define MAX_CRC_LENGTH 65535
  23
  24
  25static int __init crc_test_init(void)
  26{
  27        u16 crc16 = 0, verify16 = 0;
  28        u32 crc32 = 0, verify32 = 0;
  29        __le32 verify32le = 0;
  30        unsigned char *data;
  31        unsigned long i;
  32        int ret;
  33
  34        struct crypto_shash *crct10dif_tfm;
  35        struct crypto_shash *crc32c_tfm;
  36
  37        if (!cpu_has_feature(CPU_FTR_ARCH_207S))
  38                return -ENODEV;
  39
  40        data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
  41        if (!data)
  42                return -ENOMEM;
  43
  44        crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
  45
  46        if (IS_ERR(crct10dif_tfm)) {
  47                pr_err("Error allocating crc-t10dif\n");
  48                goto free_buf;
  49        }
  50
  51        crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
  52
  53        if (IS_ERR(crc32c_tfm)) {
  54                pr_err("Error allocating crc32c\n");
  55                goto free_16;
  56        }
  57
  58        do {
  59                SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
  60                SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
  61
  62                crct10dif_shash->tfm = crct10dif_tfm;
  63                ret = crypto_shash_init(crct10dif_shash);
  64
  65                if (ret) {
  66                        pr_err("Error initing crc-t10dif\n");
  67                        goto free_32;
  68                }
  69
  70
  71                crc32c_shash->tfm = crc32c_tfm;
  72                ret = crypto_shash_init(crc32c_shash);
  73
  74                if (ret) {
  75                        pr_err("Error initing crc32c\n");
  76                        goto free_32;
  77                }
  78
  79                pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
  80                for (i=0; i<iterations; i++) {
  81                        size_t len, offset;
  82
  83                        get_random_bytes(data, MAX_CRC_LENGTH);
  84                        get_random_bytes(&len, sizeof(len));
  85                        get_random_bytes(&offset, sizeof(offset));
  86
  87                        len %= MAX_CRC_LENGTH;
  88                        offset &= 15;
  89                        if (len <= offset)
  90                                continue;
  91                        len -= offset;
  92
  93                        crypto_shash_update(crct10dif_shash, data+offset, len);
  94                        crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
  95                        verify16 = crc_t10dif_generic(verify16, data+offset, len);
  96
  97
  98                        if (crc16 != verify16) {
  99                                pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
 100                                       crc16, verify16, len);
 101                                break;
 102                        }
 103
 104                        crypto_shash_update(crc32c_shash, data+offset, len);
 105                        crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
 106                        verify32 = le32_to_cpu(verify32le);
 107                        verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
 108                        if (crc32 != (u32)verify32le) {
 109                                pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
 110                                       crc32, verify32, len);
 111                                break;
 112                        }
 113                }
 114                pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
 115        } while (0);
 116
 117free_32:
 118        crypto_free_shash(crc32c_tfm);
 119
 120free_16:
 121        crypto_free_shash(crct10dif_tfm);
 122
 123free_buf:
 124        kfree(data);
 125
 126        return 0;
 127}
 128
 129static void __exit crc_test_exit(void) {}
 130
 131module_init(crc_test_init);
 132module_exit(crc_test_exit);
 133module_param(iterations, long, 0400);
 134
 135MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
 136MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
 137MODULE_LICENSE("GPL");
 138