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Revision history for Perl extension Digest::SHA.

5.85  Wed Jun 26 04:05:26 MST 2013
	- workaround for repeated calls to shaclose (ref. Bug #86295)
		-- need to explicitly reset internal pointer to NULL
			ref. shaclose() in SHA.xs
	- corrected typos in shasum script
		-- ref. Bug #85430

5.84  Sat Mar  9 17:36:08 MST 2013
	- untweaked Makefile.PL to remove dependencies of SHA.c
		-- dependencies were breaking builds on VMS
		-- retaining dependencies provides too little benefit
			for cost of portable workaround

5.83  Mon Mar  4 08:12:00 MST 2013
	- removed code for standalone C operation (no longer used)
		-- eliminates need for external symbols
		-- consolidates SHA and HMAC code
		-- reduces size of object files
		-- thanks to Marc Lehmann for suggestions
	- tweaked Makefile.PL to show dependencies of SHA.c

5.82  Thu Jan 24 04:54:12 MST 2013
	- introduced workaround to SvPVbyte bug in Perl 5.6
		-- module behavior now consistent under all Perls 5.6+
			-- ref: new test script t/unicode.t
		-- SHA routines now always croak on wide chars (5.6+)
	- removed "static" message schedules from C code
		-- default "auto" is now just as fast
		-- thread-safe option (-t) no longer necessary
			-- still allowed, but ignored
		-- simplifies source and header files
			-- eliminates SHA_STO_CLASS and SHA_THREAD_SAFE
			-- ref. Bug #82784
		-- thanks to Steve Hay for initial patch
	- provided documentation to describe Unicode handling
		-- ref: Bug #82378
	- updated documentation of NIST statement on SHA-1

5.81  Mon Jan 14 05:17:08 MST 2013
	- corrected load subroutine (SHA.pm) to prevent double-free
		-- Bug #82655: Security issue - segfault
		-- thanks to Victor Efimov and Nicholas Clark
			for technical expertise and suggestions

5.80  Mon Dec 10 14:15:26 MST 2012
	- obtained noticeable speedup on Intel/gcc
		-- by setting -O1 and -fomit-frame-pointer
		-- SHA-1 about 63% faster, SHA-2 improves 11-20%

5.74  Sat Nov 24 03:10:18 MST 2012
	- handle wide-string input by converting to bytes first
		-- viz. use SvPVbyte instead of SvPV in SHA.xs
		-- thanks to Eric Brine for summary and code

5.73  Wed Oct 31 04:32:44 MST 2012
	- provided workaround for DEC compiler bug (ref. Makefile.PL)

5.72  Mon Sep 24 15:22:08 MST 2012
	- adjusted module installation directory for later Perls
		-- As of 5.11 Perl searches 'site' first, so use that
			-- ref. INSTALLDIRS in Makefile.PL
		-- thanks to Robert Sedlacek for patch

5.71  Wed Feb 29 04:06:10 MST 2012
	- prevented $! from getting clobbered in _bail() routine
		-- thanks to Zefram for patch
	- added example of BITS mode usage to shasum documentation

5.70  Wed Dec 14 02:32:10 MST 2011
	- added BITS mode to addfile method and shasum
		-- partial-byte inputs now possible via files/STDIN
		-- allows shasum to check all 8074 NIST Msg vectors
			-- previously required special programming

5.63  Tue Nov  8 02:36:42 MST 2011
	- added code to allow very large data inputs all at once
		-- previously limited to several hundred MB at a time
		-- many thanks to Thomas Drugeon for his elegant patch
	- removed outdated reference URLs from several test scripts
		-- these URLs aren't essential, and often go stale
		-- thanks to Leon Brocard for spotting this
			-- ref. rt.cpan.org #68740

5.62  Sat May 14 04:00:34 MST 2011
	- removed unnecessary loading of MIME::Base64 module
		-- thanks to dolmen for pointing this out

5.61  Wed Mar  9 05:26:36 MST 2011
	- corrected bug in 'algorithm' method
	- fixed -x option in Makefile.PL
		-- not often used since it deliberately excludes
			all 64-bit SHA transforms
	- addressed minor documentation oversights

5.60  Thu Mar  3 05:26:42 MST 2011
	- added new SHA-512/224 and SHA-512/256 transforms
		-- ref. NIST Draft FIPS 180-4 (February 2011)
	- simplified shasum by removing duplicative text
	- improved efficiency of Addfile
		-- expensive -T test now occurs only in portable mode

5.50  Tue Dec 14 06:20:08 MST 2010
	- adopted convention that '-' always means STDIN
		-- actual filename '-' accessed as './-'
		-- accords with behavior of sha1sum/md5sum
	- corrected undefined subroutine oversight in shasum
		-- inadvertent migration of _bail() from SHA.pm

5.49  Sun Dec 12 07:22:04 MST 2010
	- modified Addfile to accept all POSIX filenames
		-- standard allows all characters except NUL and '/'
	- updated shasum to more closely mimic sha1sum/md5sum
		-- added "backslash processing" to handle newlines
			and backslashes in filenames
		-- now accepts all POSIX filenames via Addfile
		-- thanks to Sean Burke for identifying edge cases

5.48  Mon Jan  4 16:32:52 MST 2010
	- fixed "shasum -a0" option (ref. rt.cpan.org #53319)
		-- incorrectly accepted 0 as a valid algorithm
			-- thanks to Zefram for patch
	- updated URL for NIST test vectors
		-- ref. files t/nistbit.t, t/nistbyte.t
			-- thanks to Leon Brocard for patch

5.47  Wed Apr 30 04:00:54 MST 2008
	- modified Makefile.PL to install in core for Perls >= 5.10
		-- thanks to Jerry Hedden for patch
	- changed from #include <> to #include "" in SHA.xs
		-- some platforms not able to find SHA source files
			-- thanks to Alexandr Ciornii for testing
	- moved .pm file to appropriate lib directory
	- minor addition to META.yml

5.46  Wed Apr  9 05:04:00 MST 2008
	- modified Addfile to recognize leading and trailing
		whitespace in filenames (ref. rt.cpan.org #34690)
	- minor C source code modification (ref. hmac.c)
	- use const in sha.c for clean builds with -Wwrite-strings
		-- thanks to Robin Barker for patch

5.45  Tue Jun 26 02:36:00 MST 2007
	- extended portability to earlier Perls
		-- works on Perl 5.003 and later
		-- thanks to Jim Doble for testing on legacy platforms
	- updated META.yml to conform to current META spec (1.3)
	- minor documentation fixes

5.44  Sat Oct 14 00:42:44 MST 2006
	- removed SIGNATURE file from distribution
		-- spurious errors from CPANPLUS can break build
	- eliminated ppport.h header file
		-- significantly reduces size of distribution
	- modified C functions in src/hmac.c to use ANSI prototypes
		-- thanks to Jarkko Hietaniemi for patch

5.43  Sat Aug  5 02:36:18 MST 2006
	- undid Perl Best Practice of favoring 3-argument "open"
		-- 3-arg version uses different semantics for "-"
			causing bugs in addfile and shasum
	- modified underlying C functions to use ANSI prototypes
		-- requested by Steve Hay (ref. Smoke [5.9.4] 28630)
		-- K&R style was causing numerous warnings from
			Borland compiler

5.42  Mon Jul 24 04:04:40 MST 2006
	- minor code changes suggested by Perl::Critic
		-- e.g. no bareword filehandles, no 2-argument open's
	- updated public key (ref. B538C51C)
		-- previous one (0AF563FE) expired July 2, 2006
	- added documentation to warn that Base64 digests are NOT padded
		-- padding must be done by user if interoperability
			with other software is required

5.41  Sat Jun  3 01:50:46 MST 2006
	- corrected addfile
		-- process $file argument as a filehandle unless passed
			as a SCALAR (which indicates a file name)

5.40  Fri Jun  2 04:00:30 MST 2006
	- modified addfile to accept indirect filehandles
		-- ref. rt.cpan.org #19627 and #19641

5.39  Sun May 28 03:22:24 MST 2006
	- modified shasum to warn rather than die for file errors
		-- to follow conventions of GNU sha1sum/md5sum

5.38  Thu May 25 02:02:02 MST 2006
	- added new capabilities to the "addfile" method
		-- now able to accept file names as well as handles
		-- includes mode for portable digest calculation
			-- thanks to Adam Kennedy for emails and ideas
				ref. File::LocalizeNewlines
	- used expanded addfile interface to simplify shasum (sumfile)
		-- regex a tad less general than 5.37, but handles all
			known newline variants in UNIX/Windows/MacOS
	- enhanced WARNING messages from shasum checkfile processing
		-- to mimic behavior of md5sum

5.37  Mon May  8 04:30:09 MST 2006
	- modified shasum to avoid file slurping (ref. sub sumfile)
	- improved error handling of checksum files in shasum
		-- to better mimic the behavior of md5sum
	- refined line-break regex in shasum (ref. sub sumfile)
		-- catches multiple CR's preceding LF
			thanks to Gisle Aas for suggested patch
	- changed loop vars to signed int's in shadump (ref. src/sha.c)
		-- to prevent type mismatch warnings

5.36  Mon May  8 01:38:36 MST 2006
	- fixed the "portable" option in shasum
		-- normalize line-breaks in text files only

5.35  Thu May  4 16:54:42 MST 2006
	- added "portable" option to shasum
		-- to make digests match across Windows/Unix/MacOS
	- enabled bundling of shasum command line options
		-- to mimic behavior of md5sum
	- removed \r's from text files in t/nist directory
		-- resolves SIGNATURE clashes (rt.cpan.org #18983)
	- changed suffix on SHA64_MAX (src/sha.h) to ULL
		-- eliminates gcc warnings (rt.cpan.org #18988)
	- specified minimum Perl version for module and Makefile.PL
		-- closes rt.cpan.org #18984

5.34  Thu Feb  2 18:55:40 MST 2006
	- removed Unix-style pathnames in test scripts
		-- causing problems on OpenVMS
		-- thanks to Steve Peters for patch
	- included latest version of Perl Portability header (ppport.h)
	- added PERL_CORE check to test scripts
		-- allows module to be built into Perl distribution

5.32  Fri Dec  2 02:32:20 MST 2005
	- added POD section to shasum script
		-- thanks to Gunnar Wolf for patch
	- made minor code changes to silence compiler warnings
		-- resulting from signed/unsigned integer mixing
	- inserted code in test scripts for POD checking
		-- to recover gracefully if Test::More isn't installed

5.31  Mon Sep  5 00:52:42 MST 2005
	- added standard tests for pod and pod-coverage checking
	- inserted subtest to check for failure when using
		unrecognized SHA algorithm

5.30  Sat Aug 20 16:46:08 MST 2005
	- updated docs with recent NIST statement on SHA-1
		-- advises use of larger and stronger hash functions
			(i.e. SHA-224/256/384/512) for new developments

5.29  Sun Aug 14 04:48:34 MST 2005
	- added explicit casts in "shaload" routine (ref. "ldvals")
		-- thanks to E. Allen Smith for pointing out SGI compiler
			warnings on IPxx-irix platforms
	- updated docs with cautionary note about SHA-1

5.28  Wed Nov 10 15:33:20 MST 2004
	- provided more flexible formatting of SHA state files
		-- entries may now contain embedded whitespace
			for improved readability
	- minor code cleanups

5.27  Sun Oct 24 02:54:00 MST 2004
	- minor code cleanups
		-- reduces size of dump files for SHA-1/224/256

5.26  Thu Oct  7 14:52:00 MST 2004
	- streamlined distribution
		-- reduced NIST vector tests from 200 to 20
			-- former number was overkill
			-- distro now downloads and builds more quickly
	- rewrote SYNOPSIS sections in pod file
	- made additional tweaks to t/8-shasum.t for portability
	- cleaned up test scripts

5.25  Sun Sep 12 18:48:00 MST 2004
	- removed non-essential test script
		-- t/8-shasum.t causes problems on sparc64-linux
	- reverted to using eval "require $module" in shasum

5.24  Sun Sep 12 02:50:18 MST 2004
	- modified shasum to use barewords in "require" statements
		-- ref. perl.cpan.testers (157305)

5.23  Thu Sep  9 23:06:18 MST 2004
	- corrected bug in test script
		-- use blib when invoking perl as an external
			command in t/8-shasum.t

5.22  Tue Sep  7 19:12:40 MST 2004
	- broadened SHA-384/512 support
		-- to compilers with no ULLONG_MAX in limits.h
			-- e.g IBM C (xlC 6.0.0) on AIX 4.3.3
			-- thanks to Chris Carey for suggestions
				and technical expertise
	- improved use of static storage class in transforms
		-- detection of Intel arch. now done in Makefile.PL
		-- NB: static not used if compiling for thread safety
	- minor changes to documentation

5.21  Mon Aug 23 04:02:00 MST 2004
	- removed 64-bit constant expressions from #if statements
		-- ref. src/sha.h (lines 55, 58, and 61)
		-- even if compiler supports long long's, preprocessor
			may use long's when evaluating expressions
	- improved test script for "shasum" (t/8-shasum.t)
		-- exercises check file option (-c)

5.20  Sun Aug 15 04:24:48 MST 2004
	- introduced "shasum" script
		-- mimics the usage and behavior of "md5sum"
		-- adds "-a" option to select SHA algorithm
		-- for help, just type "shasum -h"

5.10  Fri Aug  6 02:04:38 MST 2004
	- simplified module documentation
		-- made it consistent with Digest::SHA::PurePerl docs

5.03  Sat Jul 31 00:00:48 MST 2004
	- corrected HMAC-SHA-384/512 bug (cpan #7181, Adam Woodbury)
		-- code was using hardwired blocksize for SHA-1/256
			-- ref. src/hmac.c, src/hmac.h

5.02  Thu Jul 29 02:48:00 MST 2004
	- updated documentation and "dump-load.t" test script
		-- to be consistent with Digest::SHA::PurePerl
	- included a SIGNATURE file
		-- for stronger authentication of module contents
			-- ref. Module::Signature on CPAN
	- corrected embarrassing misspelling in docs
		-- apologies to Gisle Aas

5.01  Fri May 21 13:08:12 MST 2004
	- check for undefined SHA handle when calling "shaclose()"
		-- prevents intermittent cleanup errors during
			global object destruction

5.00  Fri May 14 04:45:00 MST 2004
	- minor documentation fixes
	- restored classical style of version numbering (X.YZ)
		-- previous X.Y.Z style caused installation difficulties
			when using CPANPLUS

4.3.3 Wed May  5 00:30:40 MST 2004
	- fixed bug in "strto64()" function
		-- caused problems in state files with CR/LF pairs
		-- thanks to Martin Thurn for testing support

4.3.2 Wed Apr 28 03:56:00 MST 2004
	- added Makefile.PL options
		-- thread-safety: -t
		-- exclude 384/512 support: -x
		-- e.g. perl Makefile.PL -t
	- temporarily suppress dump/load tests for SHA-384/512
		-- pending clarification of problem on sun4u sparc

4.3.1 Thu Mar  4 02:54:00 MST 2004
	- removed unused functions from XS file
		-- reduces size of compiled objects
	- simplified implementation of Digest::SHA object
		-- now a blessed SHAPtr ref instead of blessed array ref
		-- results in slight speed-up of OO operations
	- streamlined underlying C source
		-- used macros to consolidate repetitive code
	- rewrote test scripts to depend on Test rather than Test::More
		-- allows module to be checked in minimal Perl environments
	- added compilation option for thread-safety
		-- overrides use of static arrays

4.3.0 Sat Feb  7 02:58:00 MST 2004
	- included SHA-384/512 support if using Microsoft C/C++
		-- uses MSVC's __int64 in place of "long long"
	- enhanced portability and efficiency on diverse platforms
		-- automatically sets up optimal types for 32/64-bit ops
	- improved test scripts for better reporting
		-- many thanks to Alex Muntada for helpful suggestions

4.2.2 Sat Jan 31 17:10:20 MST 2004
	- repaired 32-bit SHA operations for 8-byte longs

4.2.1 Sat Jan 24 00:56:54 MST 2004
	- modified I/O and memory management in underlying C code
		-- uses Perl libraries when compiled as CPAN module
			-- otherwise defaults to ANSI C libraries
		-- bypasses problems in MSWin multi-threaded Perls
			-- avoids "Free to wrong pool" error
		-- special thanks to Robert Gilmour and Brian Gladman
			for technical guidance and testing

4.2.0 Sat Dec 27 16:08:00 MST 2003
	- added support for recently-announced SHA-224 algorithm
		-- ref. FIPS 180-2 Change Notice 1
		-- also includes HMAC-SHA-224

4.1.0 Thu Dec 25 00:58:00 MST 2003
	- repaired "nist-vectors" test scripts for MSWin32 portability
		-- use binmode for data files

4.0.9 Wed Dec 24 02:58:22 MST 2003
	- use canonical file specs in test scripts
		-- enhances portability across different OSes
	- modify type declarations of objects in XS file
		-- re-declare as (SV *) and cast to (AV *) SvRV(self)
			-- in response to AVPtr problem on MSWin32

4.0.8 Thu Dec 18 23:32:00 MST 2003
	- inherits from Digest::base if installed
		-- also checks for MIME::Base64
		-- still fully-functional if neither are installed
	- added buffer overflow protection in underlying C code
		-- ref. shahex() and shabase64() routines
		-- prior code appeared impossible to exploit, but ...
			-- better safe than sorry
		-- does not impact runtime efficiency
	- minor code cleanup

4.0.7 Sat Dec 13 00:48:24 MST 2003
	- check for undefined SHA handle when calling "shaclose()"
		-- was causing cleanup err during global destruction

4.0.6 Thu Dec 11 02:18:00 MST 2003
	- more optimization and streamlining
		-- a bit faster on non-big-endians (e.g. Intel)
	- rewrote time-critical functions and methods in XS
	- removed unused C functions from source files

4.0.5 Sat Dec  6 00:02:24 MST 2003
	- performance optimizations
		-- rewrote "add" method in XS
		-- unrolled loops in sha256 transform

4.0.4 Thu Dec  4 00:07:00 MST 2003
	- made Digest::SHA into a self-contained module
		-- no longer depends on Digest::base
		-- more convenient for users
			-- no need to install Digest:: module

4.0.3 Wed Dec  3 00:01:20 MST 2003
	- Digest::SHA now a subclass of Digest::base
		-- inherits hexdigest/b64digest/addfile methods
	- added "hashsize" method
	- removed old "shaopen()/shawrite()/..." legacy code
		-- in favor of standard, streamlined OO interface
	- renamed test vector files from NIST
		-- prevents problems on 8+3 filesystems
	- added test for Dave Ireland's SHA-256 vector

4.0.0 Sat Nov 29 21:14:09 MST 2003
	- major streamlining of interface (hence, major version change)
		-- coordinated with Gisle Aas and J. Duque
			-- goal is to produce a single SHA module
		-- adheres to OO and functional styles of Digest::
		-- greatly reduces the number of interface functions
		-- old functions still supported
			-- use Digest::SHA ':legacy'
			-- will be deprecated in near future
	- rewrote all test scripts to match new interface
		-- very easy to modify all 281 tests
		-- old interface maps cleanly to new one

3.0   Wed Nov 26 05:02:34 MST 2003
	- added functions that conform to Digest:: interface
		-- both functional and OO styles
			-- byte-oriented data only
		-- continue to support original interface as well
			-- necessary for bit-oriented data
	- supplied formal test vectors for HMAC-SHA-256
		-- from draft-ietf-ipsec-ciph-sha-256-01.txt
	- included tests for all OO methods

2.4   Sat Nov 22 17:10:22 MST 2003
	- code cleanup
		-- "sha.c" now completely free of #ifdef's
	- modularized all 64-bit (long long) code
	- improved readability of header files
	- simplified logic of "fixdump" utility

2.3   Wed Nov 19 03:54:31 MST 2003
	- minor optimizations and code cleanup
		-- improved maintainability by reducing #ifdef's
		-- sha1 transform code now easier to follow
	- streamlined shadump/shaload file format
		-- eliminated special "HQ" entry
		-- state now held in "H" for all transforms
		-- supplied "fixdump" utility to convert old format
	- SHA-384/512 functions now return NULL for no 64-bit operations
		-- previously they were undefined
		-- no longer necessary to use eval's to test for presence

2.2   Sun Nov 16 01:54:00 MST 2003
	- optimized the performance of the SHA-1 transform
		-- around 20-30% faster than previous version
		-- achieved by loop unrolling and assignment consolidation
	- enhanced shaload/shadump to allow interaction with stdin/stdout
		-- "$filename" argument now optional

2.1   Sun Nov  9 03:28:04 MST 2003
	- simplified data input routines
		-- length argument now optional for byte data
			(special thanks to Jeffrey Friedl for this idea)
		-- interface still compatible with earlier versions
			-- changes will not affect existing client code
	- streamlined underlying C code for easier maintenance
	- provided additional tests for persistent data

2.0   Sat Nov  1 03:55:36 MST 2003
	- added functions for HMAC-SHA-1/256/384/512 (FIPS PUB 198)
	- shadump/shaload files now compatible between 32/64-bit machines

1.01  Sat Oct 25 02:44:55 MST 2003
	- package now downloads and installs much faster
	- reduced distribution size by 80%
		-- pruned extensive NIST vectors to a useful subset
		-- still possible to test all vectors if desired
			--- see "t/nist/COPYRIGHT" file for details
	- added routines to provide persistent storage of SHA states
		-- shadump() and shaload()
	- reduced runtime of large bitstring tests (gillogly-hard)
		-- illustrates usefulness of shadump()/shaload()

1.0   Sat Oct 18 17:35:07 MST 2003
	- documentation fixes
	- code cleanup: no more compiler warnings from gcc -Wall
	- added code to allow reading of intermediate digest state
		-- shahex() prior to shafinish() returns current state

0.9   Thu Oct  9 20:43:54 MST 2003
	- version updated to reflect portability check and passing
		of all tests (1401)

0.01  Wed Oct  8 22:28:05 2003
	- original version; created by h2xs 1.22 with options
		-x -A -n Digest::SHA sha.h
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