Index: nbase_misc.c =================================================================== --- nbase_misc.c (revision 11639) +++ nbase_misc.c (working copy) @@ -377,3 +377,80 @@ } +/* + * CRC-32C (Castagnoli) Cyclic Redundancy Check. + * Taken straight from RFC 4960 (SCTP). + */ + +#include "nbase_crc32ct.h" + +/* Return the CRC-32C of the bytes buffer[0..length-1] */ +unsigned long crc32c(unsigned char *buf, unsigned int len) +{ + unsigned int i; + unsigned long crc32 = ~0L; + unsigned long result; + unsigned char byte0, byte1, byte2, byte3; + + for (i = 0; i < len; i++) { + CRC32C(crc32, buf[i]); + } + + result = ~crc32; + + /* result now holds the negated polynomial remainder; + * since the table and algorithm is "reflected" [williams95]. + * That is, result has the same value as if we mapped the message + * to a polynomial, computed the host-bit-order polynomial + * remainder, performed final negation, then did an end-for-end + * bit-reversal. + * Note that a 32-bit bit-reversal is identical to four inplace + * 8-bit reversals followed by an end-for-end byteswap. + * In other words, the bytes of each bit are in the right order, + * but the bytes have been byteswapped. So we now do an explicit + * byteswap. On a little-endian machine, this byteswap and + * the final ntohl cancel out and could be elided. + */ + + byte0 = result & 0xff; + byte1 = (result >> 8) & 0xff; + byte2 = (result >> 16) & 0xff; + byte3 = (result >> 24) & 0xff; + crc32 = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3); + return crc32; +} + + +/* + * Adler32 Checksum Calculation. + * Taken straight from RFC 2960 (SCTP). + */ + +#define ADLER32_BASE 65521 /* largest prime smaller than 65536 */ + +/* + * Update a running Adler-32 checksum with the bytes buf[0..len-1] + * and return the updated checksum. The Adler-32 checksum should + * be initialized to 1. + */ +unsigned long update_adler32(unsigned long adler, + unsigned char *buf, int len) +{ + unsigned long s1 = adler & 0xffff; + unsigned long s2 = (adler >> 16) & 0xffff; + int n; + + for (n = 0; n < len; n++) { + s1 = (s1 + buf[n]) % ADLER32_BASE; + s2 = (s2 + s1) % ADLER32_BASE; + } + return (s2 << 16) + s1; +} + +/* Return the Adler32 of the bytes buf[0..len-1] */ +unsigned long adler32(unsigned char *buf, int len) +{ + return update_adler32(1L, buf, len); +} + + Index: nbase_crc32ct.h =================================================================== --- nbase_crc32ct.h (revision 0) +++ nbase_crc32ct.h (revision 0) @@ -0,0 +1,175 @@ + +/*************************************************************************** + * nbase_crc32ct.h -- CRC-32C (Castagnoli) table definitions. * + * * + ***********************IMPORTANT NMAP LICENSE TERMS************************ + * * + * The Nmap Security Scanner is (C) 1996-2008 Insecure.Com LLC. Nmap is * + * also a registered trademark of Insecure.Com LLC. This program is free * + * software; you may redistribute and/or modify it under the terms of the * + * GNU General Public License as published by the Free Software * + * Foundation; Version 2 with the clarifications and exceptions described * + * below. This guarantees your right to use, modify, and redistribute * + * this software under certain conditions. If you wish to embed Nmap * + * technology into proprietary software, we sell alternative licenses * + * (contact sales@insecure.com). Dozens of software vendors already * + * license Nmap technology such as host discovery, port scanning, OS * + * detection, and version detection. * + * * + * Note that the GPL places important restrictions on "derived works", yet * + * it does not provide a detailed definition of that term. To avoid * + * misunderstandings, we consider an application to constitute a * + * "derivative work" for the purpose of this license if it does any of the * + * following: * + * o Integrates source code from Nmap * + * o Reads or includes Nmap copyrighted data files, such as * + * nmap-os-db or nmap-service-probes. * + * o Executes Nmap and parses the results (as opposed to typical shell or * + * execution-menu apps, which simply display raw Nmap output and so are * + * not derivative works.) * + * o Integrates/includes/aggregates Nmap into a proprietary executable * + * installer, such as those produced by InstallShield. * + * o Links to a library or executes a program that does any of the above * + * * + * The term "Nmap" should be taken to also include any portions or derived * + * works of Nmap. This list is not exclusive, but is just meant to * + * clarify our interpretation of derived works with some common examples. * + * These restrictions only apply when you actually redistribute Nmap. For * + * example, nothing stops you from writing and selling a proprietary * + * front-end to Nmap. Just distribute it by itself, and point people to * + * http://nmap.org to download Nmap. * + * * + * We don't consider these to be added restrictions on top of the GPL, but * + * just a clarification of how we interpret "derived works" as it applies * + * to our GPL-licensed Nmap product. This is similar to the way Linus * + * Torvalds has announced his interpretation of how "derived works" * + * applies to Linux kernel modules. Our interpretation refers only to * + * Nmap - we don't speak for any other GPL products. * + * * + * If you have any questions about the GPL licensing restrictions on using * + * Nmap in non-GPL works, we would be happy to help. As mentioned above, * + * we also offer alternative license to integrate Nmap into proprietary * + * applications and appliances. These contracts have been sold to dozens * + * of software vendors, and generally include a perpetual license as well * + * as providing for priority support and updates as well as helping to * + * fund the continued development of Nmap technology. Please email * + * sales@insecure.com for further information. * + * * + * As a special exception to the GPL terms, Insecure.Com LLC grants * + * permission to link the code of this program with any version of the * + * OpenSSL library which is distributed under a license identical to that * + * listed in the included COPYING.OpenSSL file, and distribute linked * + * combinations including the two. You must obey the GNU GPL in all * + * respects for all of the code used other than OpenSSL. If you modify * + * this file, you may extend this exception to your version of the file, * + * but you are not obligated to do so. * + * * + * If you received these files with a written license agreement or * + * contract stating terms other than the terms above, then that * + * alternative license agreement takes precedence over these comments. * + * * + * Source is provided to this software because we believe users have a * + * right to know exactly what a program is going to do before they run it. * + * This also allows you to audit the software for security holes (none * + * have been found so far). * + * * + * Source code also allows you to port Nmap to new platforms, fix bugs, * + * and add new features. You are highly encouraged to send your changes * + * to fyodor@insecure.org for possible incorporation into the main * + * distribution. By sending these changes to Fyodor or one of the * + * Insecure.Org development mailing lists, it is assumed that you are * + * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right * + * to reuse, modify, and relicense the code. Nmap will always be * + * available Open Source, but this is important because the inability to * + * relicense code has caused devastating problems for other Free Software * + * projects (such as KDE and NASM). We also occasionally relicense the * + * code to third parties as discussed above. If you wish to specify * + * special license conditions of your contributions, just say so when you * + * send them. * + * * + * This program is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * General Public License v2.0 for more details at * + * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * + * included with Nmap. * + * * + ***************************************************************************/ + +/* $Id$ */ + +#ifndef NBASE_CRC32CT_H +#define NBASE_CRC32CT_H + +#define CRC32C_POLY 0x1EDC6F41 +#define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF]) + +unsigned long crc_c[256] = { +0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, +0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, +0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, +0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, +0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, +0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, +0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, +0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, +0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, +0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, +0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, +0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, +0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, +0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, +0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, +0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, +0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, +0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, +0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, +0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, +0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, +0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, +0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, +0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, +0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, +0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, +0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, +0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, +0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, +0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, +0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, +0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, +0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, +0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, +0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, +0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, +0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, +0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, +0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, +0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, +0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, +0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, +0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, +0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, +0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, +0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, +0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, +0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, +0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, +0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, +0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, +0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, +0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, +0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, +0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, +0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, +0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, +0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, +0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, +0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, +0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, +0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, +0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, +0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L, +}; + +#endif /* NBASE_CRC32CT_H */ + Property changes on: nbase_crc32ct.h ___________________________________________________________________ Added: svn:keywords + Id Added: svn:eol-style + native Index: nbase.h =================================================================== --- nbase.h (revision 11639) +++ nbase.h (working copy) @@ -402,6 +402,10 @@ /* CRC16 Cyclic Redundancy Check */ unsigned long crc16(unsigned char *buf, int len); +/* CRC32C Cyclic Redundancy Check */ +unsigned long crc32c(unsigned char *buf, unsigned int len); +/* Adler32 Checksum */ +unsigned long adler32(unsigned char *buf, int len); long tval2msecs(char *tspec);