Revision history for Perl extension Digest::SHA3.
0.25  Wed Jul 27 20:04:40 MST 2016
        - prevented sha3sum from possibly running malicious code
                -- remove '.' from @INC before module loading
                -- ref. rt.cpan.org #116513
        - namespace cleanup (ref. rt.cpan.org #105371 and #105372)
        - minor code and documentation tweaks
0.24  Sat Jan 10 00:45:34 MST 2015
        - simplified shabits() routine (bitwise input buffering)
                -- slightly less efficient but easier to understand
        - minor documentation tweaks and additions
0.23  Sun Jan  4 05:36:30 MST 2015
        - updated to reflect Draft FIPS 202
                -- append domain separation bits to message
                -- implement SHAKE128 and SHAKE256 Extendable-Output
                        Functions (XOFs)
0.22  Sun Jun  1 00:15:46 MST 2014
        - fixed reserved-word clash when compiling with C++
                -- use 'classname' instead of 'class'
                        -- ref. SHA3.xs (rt.cpan.org #96090)
0.21  Fri May 16 10:21:46 MST 2014
        - restored original 'addfile' for use on opened file handles
                -- allows callbacks in place of actual files
                        -- ref. IO::Callback (rt.cpan.org #95643)
        - re-established inheritance from Digest::base
                -- to pick up future Digest enhancements automatically
        - cleaned up documentation
0.20  Wed May  7 07:57:10 MST 2014
        - consolidated all dynamic memory allocation into XSUBs
                -- streamlines referencing of SHA3 objects
                -- simplifies DESTROYing of objects
        - enhanced Makefile.PL to allow 'use warnings'
                -- automatically reverts to $^W for early Perls
        - scrubbed C and Perl code to remove all compiler warnings
0.12  Sat Apr 19 05:14:50 MST 2014
        - added universal newlines mode ("U") to addfile and sha3sum
                -- based on Python Universal Newlines concept
                        -- newlines identical across MacOS, DOS, and UNIX
                -- will deprecate portable mode ("p") in future
                        -- "U" mode is cleaner and more efficient
        - enhanced performance
                -- reduced number of dynamic memory allocations
                -- sped up addfile method with use of C code
                        -- ref. SHA3.xs (_addfilebin and _addfileuniv)
        - changed text file test (-T) to act on filehandles
                -- improves consistency when reading from STDIN
                -- still must act on filenames for early Perls (< 5.6)
        - sealed memory leak in SHA3.xs
                -- arose only with SvPVbyte exceptions during eval
        - patched inheritence bug (ref: rt.cpan.org #94830)
                -- use sv_isobject/sv_derived_from instead of sv_isa
        - added 'allocated' flag to SHA3 structure (ref. src/sha3.h)
                -- to guard against Perl double frees
0.11  Mon Feb 17 16:42:04 MST 2014
        - tightened code in SHA3.xs
                -- added sv_isa checks when invoking methods
0.10  Thu Jan 30 08:24:30 MST 2014
        - improved the performance of hexadecimal output functions
                -- ref. 'shahex' in src/sha3.c
                -- thanks to Thomas Drugeon for ideas and test script
0.09  Sun Jan  5 19:08:32 MST 2014
        - added a 'squeeze' method for SHA3-0 objects
                -- to construct SHA3-0 digests of any desired length
0.08  Wed Jun 26 04:32:06 MST 2013
        - workaround for repeated calls to shaclose
                -- ref. Bug #86295 (posted at Digest::SHA)
                -- need to explicitly reset internal pointer to NULL
                        ref. shaclose() in SHA3.xs
        - corrected typos in sha3sum script
                -- ref. Bug #85430 (posted at Digest::SHA)
0.07  Sat Mar  9 17:36:14 MST 2013
        - untweaked Makefile.PL to remove dependencies of SHA3.c
                -- dependencies were breaking builds on VMS
                -- retaining dependencies provides too little benefit
                        for cost of portable workaround
0.06  Mon Mar  4 08:12:04 MST 2013
        - removed code for standalone C operation (no longer used)
                -- eliminates need for external symbols
                -- reduces size of object files
                -- thanks to Marc Lehmann for suggestions
        - tweaked Makefile.PL to show dependencies of SHA3.c
0.05  Thu Jan 24 04:54:14 MST 2013
        - accommodated Unicode string input
                -- by using SvPVbyte instead of SvPV in SHA3.xs
                        -- provided workaround for Perl 5.6
                -- added new test script t/unicode.t
        - provided documentation to describe Unicode handling
        - obtained slight speedup on Intel/gcc
                -- by setting -O1 and -fomit-frame-pointer
        - adopted (from Digest::SHA) workaround for DEC compiler bug
0.04  Sun Nov 11 19:20:06 MST 2012
        - enhanced performance
                -- typically 10-15% faster than 0.03
                -- code is still easy to read and modify
        - filled in a few documentation omissions
0.03  Mon Oct 29 04:01:06 MST 2012
        - attained a 2.5x performance increase through loop unrolling
                -- code is still easy to follow
                        -- clearly traceable to Keccak pseudo code
0.02  Thu Oct 25 19:18:58 MST 2012
        - original version: adapted from Digest::SHA version 5.72