297 lines
11 KiB
C
297 lines
11 KiB
C
/* crc.c - Cyclic redundancy checks.
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* Copyright (C) 2003 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "g10lib.h"
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#include "memory.h"
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#include "cipher.h"
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#include "bithelp.h"
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/* Table of CRCs of all 8-bit messages. Generated by running code
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from RFC 1952 modified to print out the table. */
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static u32 crc32_table[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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/*
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* The following function was extracted from RFC 1952 by Simon
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* Josefsson, for the Shishi project, and modified to be compatible
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* with the modified CRC-32 used by RFC 1510, and subsequently
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* modified for GNU Libgcrypt to allow it to be used for calculating
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* both unmodified CRC-32 and modified CRC-32 values. Original
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* copyright and notice from the document follows:
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*
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* Copyright (c) 1996 L. Peter Deutsch
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*
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* Permission is granted to copy and distribute this document for
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* any purpose and without charge, including translations into
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* other languages and incorporation into compilations, provided
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* that the copyright notice and this notice are preserved, and
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* that any substantive changes or deletions from the original are
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* clearly marked.
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*
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* The copyright on RFCs, and consequently the function below, are
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* supposedly also retroactively claimed by the Internet Society
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* (according to rfc-editor@rfc-editor.org), with the following
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* copyright notice:
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*
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* Copyright (C) The Internet Society. All Rights Reserved.
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*
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* This document and translations of it may be copied and furnished
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* to others, and derivative works that comment on or otherwise
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* explain it or assist in its implementation may be prepared,
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* copied, published and distributed, in whole or in part, without
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* restriction of any kind, provided that the above copyright
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* notice and this paragraph are included on all such copies and
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* derivative works. However, this document itself may not be
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* modified in any way, such as by removing the copyright notice or
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* references to the Internet Society or other Internet
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* organizations, except as needed for the purpose of developing
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* Internet standards in which case the procedures for copyrights
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* defined in the Internet Standards process must be followed, or
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* as required to translate it into languages other than English.
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*
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* The limited permissions granted above are perpetual and will not be
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* revoked by the Internet Society or its successors or assigns.
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*
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* This document and the information contained herein is provided
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* on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET
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* ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE
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* OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
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* PARTICULAR PURPOSE.
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*
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*/
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static u32
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update_crc32 (u32 crc, const void *buf_arg, size_t len)
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{
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const char *buf = buf_arg;
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size_t n;
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for (n = 0; n < len; n++)
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crc = crc32_table[(crc ^ buf[n]) & 0xff] ^ (crc >> 8);
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return crc;
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}
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typedef struct
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{
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u32 CRC;
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byte buf[4];
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}
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CRC_CONTEXT;
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/* CRC32 */
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static void
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crc32_init (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->CRC = 0 ^ 0xffffffffL;
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}
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static void
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crc32_write (void *context, const void *inbuf, size_t inlen)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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if (!inbuf)
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return;
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ctx->CRC = update_crc32 (ctx->CRC, inbuf, inlen);
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}
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static byte *
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crc32_read (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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return ctx->buf;
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}
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static void
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crc32_final (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->CRC ^= 0xffffffffL;
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ctx->buf[0] = (ctx->CRC >> 24) & 0xFF;
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ctx->buf[1] = (ctx->CRC >> 16) & 0xFF;
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ctx->buf[2] = (ctx->CRC >> 8) & 0xFF;
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ctx->buf[3] = (ctx->CRC ) & 0xFF;
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}
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/* CRC32 a'la RFC 1510 */
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static void
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crc32rfc1510_init (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->CRC = 0;
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}
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static void
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crc32rfc1510_final (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->buf[0] = (ctx->CRC >> 24) & 0xFF;
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ctx->buf[1] = (ctx->CRC >> 16) & 0xFF;
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ctx->buf[2] = (ctx->CRC >> 8) & 0xFF;
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ctx->buf[3] = (ctx->CRC ) & 0xFF;
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}
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/* CRC24 a'la RFC 2440 */
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/*
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* The following CRC 24 routines are adapted from RFC 2440, which has
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* the following copyright notice:
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*
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* Copyright (C) The Internet Society (1998). All Rights Reserved.
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*
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* This document and translations of it may be copied and furnished
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* to others, and derivative works that comment on or otherwise
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* explain it or assist in its implementation may be prepared,
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* copied, published and distributed, in whole or in part, without
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* restriction of any kind, provided that the above copyright notice
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* and this paragraph are included on all such copies and derivative
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* works. However, this document itself may not be modified in any
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* way, such as by removing the copyright notice or references to
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* the Internet Society or other Internet organizations, except as
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* needed for the purpose of developing Internet standards in which
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* case the procedures for copyrights defined in the Internet
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* Standards process must be followed, or as required to translate
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* it into languages other than English.
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*
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* The limited permissions granted above are perpetual and will not be
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* revoked by the Internet Society or its successors or assigns.
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*
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* This document and the information contained herein is provided on
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* an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET
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* ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE
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* OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
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* PURPOSE.
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*/
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#define CRC24_INIT 0xb704ceL
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#define CRC24_POLY 0x1864cfbL
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static void
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crc24rfc2440_init (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->CRC = CRC24_INIT;
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}
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static void
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crc24rfc2440_write (void *context, const void *inbuf_arg, size_t inlen)
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{
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const unsigned char *inbuf = inbuf_arg;
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int i;
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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if (!inbuf)
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return;
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while (inlen--) {
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ctx->CRC ^= (*inbuf++) << 16;
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for (i = 0; i < 8; i++) {
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ctx->CRC <<= 1;
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if (ctx->CRC & 0x1000000)
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ctx->CRC ^= CRC24_POLY;
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}
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}
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}
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static void
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crc24rfc2440_final (void *context)
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{
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CRC_CONTEXT *ctx = (CRC_CONTEXT *) context;
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ctx->buf[0] = (ctx->CRC >> 16) & 0xFF;
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ctx->buf[1] = (ctx->CRC >> 8) & 0xFF;
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ctx->buf[2] = (ctx->CRC ) & 0xFF;
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}
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gcry_md_spec_t _gcry_digest_spec_crc32 =
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{
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"CRC32", NULL, 0, NULL, 4,
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crc32_init, crc32_write, crc32_final, crc32_read,
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sizeof (CRC_CONTEXT)
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};
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gcry_md_spec_t _gcry_digest_spec_crc32_rfc1510 =
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{
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"CRC32RFC1510", NULL, 0, NULL, 4,
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crc32rfc1510_init, crc32_write,
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crc32rfc1510_final, crc32_read,
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sizeof (CRC_CONTEXT)
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};
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gcry_md_spec_t _gcry_digest_spec_crc24_rfc2440 =
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{
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"CRC24RFC2440", NULL, 0, NULL, 3,
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crc24rfc2440_init, crc24rfc2440_write,
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crc24rfc2440_final, crc32_read,
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sizeof (CRC_CONTEXT)
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};
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