From: Robert Feldt Date: 2003-02-08T00:13:32+09:00 Subject: [ANN] Digest::CRC32 0.1.0 Hi, I'm sure there is already code around for crc32 in Ruby but I couldn't find it when I needed it so here goes... Note that is it named simply crc32 in RAA. Regards, Robert Feldt Digest::CRC32 ------------- Package: Digest::CRC32 Description: C and pure Ruby implementation of crc32 Version: 0.1.0 Release date: 2003-02-07 Author: Robert Feldt Available from: www.ce.chalmers.se/~feldt/ruby/extensions/crc32/README.txt Tarball: www.ce.chalmers.se/~feldt/ruby/extensions/crc32/crc32-0.1.0.tar.gz What is it? ----------- Implementation of the crc32 hash algorithm as a Digest::Base digester. There is both a C and a pure Ruby implementation. The former for speed and the latter for portability. By default it will use the C implementation. Why? ---- To support "legacy" apps where crc32 is used instead of more modern alternatives. Installation? ------------- 1. unpack tarball (if you haven't already) 2. ruby install.rb config 3. ruby install.rb setup 4. ruby install.rb install 5. ruby test/test_crc32.rb (OPTIONAL) Example of use? --------------- require 'digest/crc32' digester = Digest::CRC32.new digester.update "A nice little string..." p digester.hexdigest Requirements? ------------- ANSI C compiler and Ruby 1.8. Should probably work with 1.6.X Ruby also but I haven't tested it. Test::Unit is needed to run unit tests (so it is optional). Documentation? -------------- Usage should be same as for the Digest classes in the std Ruby distribution. License and legal issues? ------------------------- All files in this package are Copyright (c) 2003 Robert Feldt All rights reserved. and they are distributed under LGPL. See LICENSE for details. Special things to note? ----------------------- CRC32 should *NEVER* be used for cryptographic purposes. Use MD5 or (preferably) SHA1 for that. CRC32 (in C) is about 25% faster than MD5. CRC32 in C is more than 1500 times faster than CRC32 in Ruby on large strings. The latter is only included for use with small strings. Plans for the future? --------------------- None. Do you have comments or questions? ---------------------------------- I'd appreciate if you drop me a note if you're successfully using Digest::CRC32. If there are some known users I'll be more motivated to packing up additions / new versions and post them to RAA. Happy coding! Robert Feldt