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       1                 :            : /*
       2                 :            :  * Cryptographic API.
       3                 :            :  *
       4                 :            :  * T10 Data Integrity Field CRC16 Crypto Transform
       5                 :            :  *
       6                 :            :  * Copyright (c) 2007 Oracle Corporation.  All rights reserved.
       7                 :            :  * Written by Martin K. Petersen <martin.petersen@oracle.com>
       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                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      17                 :            :  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
      18                 :            :  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
      19                 :            :  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
      20                 :            :  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
      21                 :            :  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
      22                 :            :  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
      23                 :            :  * SOFTWARE.
      24                 :            :  *
      25                 :            :  */
      26                 :            : 
      27                 :            : #include <linux/crc-t10dif.h>
      28                 :            : #include <linux/module.h>
      29                 :            : #include <linux/kernel.h>
      30                 :            : 
      31                 :            : /* Table generated using the following polynomium:
      32                 :            :  * x^16 + x^15 + x^11 + x^9 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
      33                 :            :  * gt: 0x8bb7
      34                 :            :  */
      35                 :            : static const __u16 t10_dif_crc_table[256] = {
      36                 :            :         0x0000, 0x8BB7, 0x9CD9, 0x176E, 0xB205, 0x39B2, 0x2EDC, 0xA56B,
      37                 :            :         0xEFBD, 0x640A, 0x7364, 0xF8D3, 0x5DB8, 0xD60F, 0xC161, 0x4AD6,
      38                 :            :         0x54CD, 0xDF7A, 0xC814, 0x43A3, 0xE6C8, 0x6D7F, 0x7A11, 0xF1A6,
      39                 :            :         0xBB70, 0x30C7, 0x27A9, 0xAC1E, 0x0975, 0x82C2, 0x95AC, 0x1E1B,
      40                 :            :         0xA99A, 0x222D, 0x3543, 0xBEF4, 0x1B9F, 0x9028, 0x8746, 0x0CF1,
      41                 :            :         0x4627, 0xCD90, 0xDAFE, 0x5149, 0xF422, 0x7F95, 0x68FB, 0xE34C,
      42                 :            :         0xFD57, 0x76E0, 0x618E, 0xEA39, 0x4F52, 0xC4E5, 0xD38B, 0x583C,
      43                 :            :         0x12EA, 0x995D, 0x8E33, 0x0584, 0xA0EF, 0x2B58, 0x3C36, 0xB781,
      44                 :            :         0xD883, 0x5334, 0x445A, 0xCFED, 0x6A86, 0xE131, 0xF65F, 0x7DE8,
      45                 :            :         0x373E, 0xBC89, 0xABE7, 0x2050, 0x853B, 0x0E8C, 0x19E2, 0x9255,
      46                 :            :         0x8C4E, 0x07F9, 0x1097, 0x9B20, 0x3E4B, 0xB5FC, 0xA292, 0x2925,
      47                 :            :         0x63F3, 0xE844, 0xFF2A, 0x749D, 0xD1F6, 0x5A41, 0x4D2F, 0xC698,
      48                 :            :         0x7119, 0xFAAE, 0xEDC0, 0x6677, 0xC31C, 0x48AB, 0x5FC5, 0xD472,
      49                 :            :         0x9EA4, 0x1513, 0x027D, 0x89CA, 0x2CA1, 0xA716, 0xB078, 0x3BCF,
      50                 :            :         0x25D4, 0xAE63, 0xB90D, 0x32BA, 0x97D1, 0x1C66, 0x0B08, 0x80BF,
      51                 :            :         0xCA69, 0x41DE, 0x56B0, 0xDD07, 0x786C, 0xF3DB, 0xE4B5, 0x6F02,
      52                 :            :         0x3AB1, 0xB106, 0xA668, 0x2DDF, 0x88B4, 0x0303, 0x146D, 0x9FDA,
      53                 :            :         0xD50C, 0x5EBB, 0x49D5, 0xC262, 0x6709, 0xECBE, 0xFBD0, 0x7067,
      54                 :            :         0x6E7C, 0xE5CB, 0xF2A5, 0x7912, 0xDC79, 0x57CE, 0x40A0, 0xCB17,
      55                 :            :         0x81C1, 0x0A76, 0x1D18, 0x96AF, 0x33C4, 0xB873, 0xAF1D, 0x24AA,
      56                 :            :         0x932B, 0x189C, 0x0FF2, 0x8445, 0x212E, 0xAA99, 0xBDF7, 0x3640,
      57                 :            :         0x7C96, 0xF721, 0xE04F, 0x6BF8, 0xCE93, 0x4524, 0x524A, 0xD9FD,
      58                 :            :         0xC7E6, 0x4C51, 0x5B3F, 0xD088, 0x75E3, 0xFE54, 0xE93A, 0x628D,
      59                 :            :         0x285B, 0xA3EC, 0xB482, 0x3F35, 0x9A5E, 0x11E9, 0x0687, 0x8D30,
      60                 :            :         0xE232, 0x6985, 0x7EEB, 0xF55C, 0x5037, 0xDB80, 0xCCEE, 0x4759,
      61                 :            :         0x0D8F, 0x8638, 0x9156, 0x1AE1, 0xBF8A, 0x343D, 0x2353, 0xA8E4,
      62                 :            :         0xB6FF, 0x3D48, 0x2A26, 0xA191, 0x04FA, 0x8F4D, 0x9823, 0x1394,
      63                 :            :         0x5942, 0xD2F5, 0xC59B, 0x4E2C, 0xEB47, 0x60F0, 0x779E, 0xFC29,
      64                 :            :         0x4BA8, 0xC01F, 0xD771, 0x5CC6, 0xF9AD, 0x721A, 0x6574, 0xEEC3,
      65                 :            :         0xA415, 0x2FA2, 0x38CC, 0xB37B, 0x1610, 0x9DA7, 0x8AC9, 0x017E,
      66                 :            :         0x1F65, 0x94D2, 0x83BC, 0x080B, 0xAD60, 0x26D7, 0x31B9, 0xBA0E,
      67                 :            :         0xF0D8, 0x7B6F, 0x6C01, 0xE7B6, 0x42DD, 0xC96A, 0xDE04, 0x55B3
      68                 :            : };
      69                 :            : 
      70                 :          0 : __u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer, size_t len)
      71                 :            : {
      72                 :            :         unsigned int i;
      73                 :            : 
      74         [ #  # ]:          0 :         for (i = 0 ; i < len ; i++)
      75                 :          0 :                 crc = (crc << 8) ^ t10_dif_crc_table[((crc >> 8) ^ buffer[i]) & 0xff];
      76                 :            : 
      77                 :          0 :         return crc;
      78                 :            : }
      79                 :            : EXPORT_SYMBOL(crc_t10dif_generic);
      80                 :            : 
      81                 :            : MODULE_DESCRIPTION("T10 DIF CRC calculation common code");
      82                 :            : MODULE_LICENSE("GPL");