ccan/ccan/crc/crc.c

/* crc32_ieee code:
 *  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or
 *  code or tables extracted from it, as desired without restriction.
 */

/* crc32c code taken from 2.6.29 Linux kernel crypto/crc32c.c:
 * Copyright (c) 2004 Cisco Systems, Inc.
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version. */

/* crc64 code taken from Jacksum version 1.7.0 - checksum utility in Java
 * E-mail: jonelo@jonelo.de
 * Copyright (C) 2001-2006 Dipl.-Inf. (FH) Johann Nepomuk Loefflmann,
 * All Rights Reserved, http://www.jonelo.de
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 */

#include "crc.h"
#include <ccan/array_size/array_size.h>
#include <stdbool.h>
#include <stdlib.h>

/*
 * This is the CRC-32C table
 * Generated with:
 * width = 32 bits
 * poly = 0x1EDC6F41
 * reflect input bytes = true
 * reflect output bytes = true
 */
static const uint32_t crc32c_tab[] = {
	0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
	0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
	0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
	0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
	0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
	0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
	0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
	0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
	0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
	0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
	0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
	0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
	0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
	0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
	0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
	0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
	0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
	0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
	0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
	0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
	0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
	0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
	0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
	0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
	0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
	0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
	0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
	0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
	0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
	0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
	0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
	0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
	0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
	0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
	0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
	0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
	0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
	0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
	0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
	0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
	0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
	0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
	0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
	0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
	0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
	0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
	0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
	0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
	0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
	0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
	0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
	0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
	0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
	0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
	0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
	0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
	0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
	0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
	0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
	0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
	0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
	0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
	0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
	0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351
};

/*
 * Steps through buffer one byte at at time, calculates reflected
 * crc using table.
 */
uint32_t crc32c(uint32_t crc, const void *buf, size_t size)
{
	const uint8_t *p = buf;

	while (size--)
		crc = crc32c_tab[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);

	return crc;
}

const uint32_t *crc32c_table(void)
{
	return crc32c_tab;
}

static const uint32_t crc32_ieee_tab[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

uint32_t crc32_ieee(uint32_t crc, const void *buf, size_t size)
{
	const uint8_t *p;

	p = buf;
	crc ^= ~0U;

	while (size--)
		crc = crc32_ieee_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);

	return crc ^ ~0U;
}

const uint32_t *crc32_ieee_table(void)
{
	return crc32_ieee_tab;
}

/* We only keep the upper 16 bits of the table: the lower 48 are always 0 */
static uint16_t crc64_tab[] = {
    0x0000, 0x01b0, 0x0360,
    0x02d0, 0x06c0, 0x0770,
    0x05a0, 0x0410, 0x0d80,
    0x0c30, 0x0ee0, 0x0f50,
    0x0b40, 0x0af0, 0x0820,
    0x0990, 0x1b00, 0x1ab0,
    0x1860, 0x19d0, 0x1dc0,
    0x1c70, 0x1ea0, 0x1f10,
    0x1680, 0x1730, 0x15e0,
    0x1450, 0x1040, 0x11f0,
    0x1320, 0x1290, 0x3600,
    0x37b0, 0x3560, 0x34d0,
    0x30c0, 0x3170, 0x33a0,
    0x3210, 0x3b80, 0x3a30,
    0x38e0, 0x3950, 0x3d40,
    0x3cf0, 0x3e20, 0x3f90,
    0x2d00, 0x2cb0, 0x2e60,
    0x2fd0, 0x2bc0, 0x2a70,
    0x28a0, 0x2910, 0x2080,
    0x2130, 0x23e0, 0x2250,
    0x2640, 0x27f0, 0x2520,
    0x2490, 0x6c00, 0x6db0,
    0x6f60, 0x6ed0, 0x6ac0,
    0x6b70, 0x69a0, 0x6810,
    0x6180, 0x6030, 0x62e0,
    0x6350, 0x6740, 0x66f0,
    0x6420, 0x6590, 0x7700,
    0x76b0, 0x7460, 0x75d0,
    0x71c0, 0x7070, 0x72a0,
    0x7310, 0x7a80, 0x7b30,
    0x79e0, 0x7850, 0x7c40,
    0x7df0, 0x7f20, 0x7e90,
    0x5a00, 0x5bb0, 0x5960,
    0x58d0, 0x5cc0, 0x5d70,
    0x5fa0, 0x5e10, 0x5780,
    0x5630, 0x54e0, 0x5550,
    0x5140, 0x50f0, 0x5220,
    0x5390, 0x4100, 0x40b0,
    0x4260, 0x43d0, 0x47c0,
    0x4670, 0x44a0, 0x4510,
    0x4c80, 0x4d30, 0x4fe0,
    0x4e50, 0x4a40, 0x4bf0,
    0x4920, 0x4890, 0xd800,
    0xd9b0, 0xdb60, 0xdad0,
    0xdec0, 0xdf70, 0xdda0,
    0xdc10, 0xd580, 0xd430,
    0xd6e0, 0xd750, 0xd340,
    0xd2f0, 0xd020, 0xd190,
    0xc300, 0xc2b0, 0xc060,
    0xc1d0, 0xc5c0, 0xc470,
    0xc6a0, 0xc710, 0xce80,
    0xcf30, 0xcde0, 0xcc50,
    0xc840, 0xc9f0, 0xcb20,
    0xca90, 0xee00, 0xefb0,
    0xed60, 0xecd0, 0xe8c0,
    0xe970, 0xeba0, 0xea10,
    0xe380, 0xe230, 0xe0e0,
    0xe150, 0xe540, 0xe4f0,
    0xe620, 0xe790, 0xf500,
    0xf4b0, 0xf660, 0xf7d0,
    0xf3c0, 0xf270, 0xf0a0,
    0xf110, 0xf880, 0xf930,
    0xfbe0, 0xfa50, 0xfe40,
    0xfff0, 0xfd20, 0xfc90,
    0xb400, 0xb5b0, 0xb760,
    0xb6d0, 0xb2c0, 0xb370,
    0xb1a0, 0xb010, 0xb980,
    0xb830, 0xbae0, 0xbb50,
    0xbf40, 0xbef0, 0xbc20,
    0xbd90, 0xaf00, 0xaeb0,
    0xac60, 0xadd0, 0xa9c0,
    0xa870, 0xaaa0, 0xab10,
    0xa280, 0xa330, 0xa1e0,
    0xa050, 0xa440, 0xa5f0,
    0xa720, 0xa690, 0x8200,
    0x83b0, 0x8160, 0x80d0,
    0x84c0, 0x8570, 0x87a0,
    0x8610, 0x8f80, 0x8e30,
    0x8ce0, 0x8d50, 0x8940,
    0x88f0, 0x8a20, 0x8b90,
    0x9900, 0x98b0, 0x9a60,
    0x9bd0, 0x9fc0, 0x9e70,
    0x9ca0, 0x9d10, 0x9480,
    0x9530, 0x97e0, 0x9650,
    0x9240, 0x93f0, 0x9120,
    0x9090
};

uint64_t crc64_iso(uint64_t crc, const void *buf, size_t size)
{
	const uint8_t *p = buf;

	while (size--) {
		uint64_t tabval = crc64_tab[(crc ^ *p++) & 0xFFL];
		tabval <<= 48;
		crc = tabval ^ (crc >> 8);
	}
	return crc;
}

const uint64_t *crc64_iso_table(void)
{
	static uint64_t *fulltab = NULL;
	unsigned int i;

	if (fulltab)
		return fulltab;

	fulltab = malloc(sizeof(uint64_t)*ARRAY_SIZE(crc64_tab));
	if (!fulltab)
		return NULL;

	for (i = 0; i < ARRAY_SIZE(crc64_tab); i++)
		fulltab[i] = (uint64_t)crc64_tab[i] << 48;

	return fulltab;
}