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| author | Guy Harris <guy@alum.mit.edu> | 2002-03-02 07:29:10 +0000 |
|---|---|---|
| committer | Guy Harris <guy@alum.mit.edu> | 2002-03-02 07:29:10 +0000 |
| commit | ceb7646a7940b6082ef4c351a20e260c8ed906ac (patch) | |
| tree | 3144caf1b7de8d246e630972c8b191866188dab1 /packet-sctp.c | |
| parent | 6dacf7e132389b4f042b79498a064f06a480d942 (diff) | |
| download | wireshark-ceb7646a7940b6082ef4c351a20e260c8ed906ac.tar.gz | |
From Michael Tuexen: update the CRC32 checksum code to match
draft-ietf-tsvwg-sctpcsum-03.
svn path=/trunk/; revision=4844
Diffstat (limited to 'packet-sctp.c')
| -rw-r--r-- | packet-sctp.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/packet-sctp.c b/packet-sctp.c index a739baae27..a75401208f 100644 --- a/packet-sctp.c +++ b/packet-sctp.c @@ -4,13 +4,13 @@ * - RFC 2960, for basic SCTP support * - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-addip-sctp-03.txt for the add-IP extension * - http://www.sctp.org/draft-ietf-tsvwg-usctp-01.txt for the 'Limited Retransmission' extension - * - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctpcsum-01.txt + * - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctpcsum-03.txt * Copyright 2000, 2001, 2002, Michael Tuexen <Michael.Tuexen@icn.siemens.de> * Still to do (so stay tuned) * - support for reassembly * - code cleanup * - * $Id: packet-sctp.c,v 1.31 2002/02/02 21:17:10 guy Exp $ + * $Id: packet-sctp.c,v 1.32 2002/03/02 07:29:10 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs <gerald@ethereal.com> @@ -604,7 +604,9 @@ sctp_crc32c(const 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 < SOURCE_PORT_LENGTH + DESTINATION_PORT_LENGTH + VERIFICATION_TAG_LENGTH; i++) { CRC32C(crc32, buf[i]); @@ -617,7 +619,14 @@ sctp_crc32c(const unsigned char* buf, unsigned int len) { CRC32C(crc32, buf[i]); } - return crc32; + result = ~crc32; + + 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 ); } static guint |