#!perl -w
## sha3sum: filter for computing SHA-3 digests (ref. shasum)
##
## Copyright (C) 2012-2015 Mark Shelor, All Rights Reserved
##
## Version: 0.24
## Sat Jan 10 00:45:34 MST 2015
## sha3sum SYNOPSIS adapted from GNU Coreutils sha1sum. Add
## "-a" option for algorithm selection,
## "-U" option for Universal Newlines support,
## "-0" option for reading bit strings, and
## "-p" option for portable digests (to be deprecated).
use strict;
use warnings;
use Fcntl;
use Getopt::Long;
my $POD = <<'END_OF_POD';
=head1 NAME
sha3sum - Print or Check SHA-3 Checksums
=head1 SYNOPSIS
Usage: sha3sum [OPTION]... [FILE]...
Print or check SHA-3 checksums.
With no FILE, or when FILE is -, read standard input.
-a, --algorithm 224 (default), 256, 384, 512, 128000, 256000
-b, --binary read in binary mode
-c, --check read SHA-3 sums from the FILEs and check them
-t, --text read in text mode (default)
-U, --UNIVERSAL read in Universal Newlines mode
produces same digest on Windows/Unix/Mac
-0, --01 read in BITS mode
ASCII '0' interpreted as 0-bit,
ASCII '1' interpreted as 1-bit,
all other characters ignored
-p, --portable read in portable mode (to be deprecated)
The following two options are useful only when verifying checksums:
-s, --status don't output anything, status code shows success
-w, --warn warn about improperly formatted checksum lines
-h, --help display this help and exit
-v, --version output version information and exit
The sums are computed as described in the FIPS 202 SHA-3 submission.
When checking, the input should be a former output of this program.
The default mode is to print a line with checksum, a character
indicating type (`*' for binary, ` ' for text, `U' for UNIVERSAL,
`^' for BITS, `?' for portable), and name for each FILE.
Report sha3sum bugs to mshelor@cpan.org
=head1 DESCRIPTION
Running I<sha3sum> is often the quickest way to compute SHA-3 message
digests. The user simply feeds data to the script through files or
standard input, and then collects the results from standard output.
The following command shows how to compute digests for typical inputs
such as the NIST test vector "abc":
perl -e "print qq(abc)" | sha3sum
Or, if you want to use SHA3-256 instead of the default SHA3-224,
simply say:
perl -e "print qq(abc)" | sha3sum -a 256
Unlike many other digest computation programs, I<sha3sum> implements
the full SHA-3 standard by allowing partial-byte inputs, which can
be recognized through the BITS option (I<-0>). The following example
computes the SHA3-384 digest of the 7-bit message I<0001100>:
perl -e "print qq(0001100)" | sha3sum -0 -a 384
=head1 AUTHOR
Copyright (c) 2012-2015 Mark Shelor <mshelor@cpan.org>.
=head1 SEE ALSO
I<sha3sum> is implemented using the Perl module L<Digest::SHA3>.
=cut
END_OF_POD
my $VERSION = "0.24";
## Try to use Digest::SHA3. If not installed, use the slower
## but functionally equivalent Digest::SHA3::PurePerl instead.
my $MOD_PREFER = "Digest::SHA3";
my $MOD_SECOND = "Digest::SHA3::PurePerl"; # Not yet implemented
my $module = $MOD_PREFER;
eval "require $module";
if ($@) {
# $module = $MOD_SECOND;
# eval "require $module";
# die "Unable to find $MOD_PREFER or $MOD_SECOND\n" if $@;
die "Unable to find $MOD_PREFER\n" if $@;
}
sub usage {
my($err, $msg) = @_;
$msg = "" unless defined $msg;
if ($err) {
warn($msg . "Type sha3sum -h for help\n");
exit($err);
}
my($USAGE) = $POD =~ /SYNOPSIS\n\n(.+)\n=head1 DESCRIPTION\n/sm;
$USAGE =~ s/^ //gm;
print $USAGE;
exit($err);
}
## Sync stdout and stderr by forcing a flush after every write
select((select(STDOUT), $| = 1)[0]);
select((select(STDERR), $| = 1)[0]);
## Collect options from command line
my ($alg, $binary, $check, $text, $status, $warn, $help, $version);
my ($portable, $BITS, $UNIVERSAL);
eval { Getopt::Long::Configure ("bundling") };
GetOptions(
'b|binary' => \$binary, 'c|check' => \$check,
't|text' => \$text, 'a|algorithm=i' => \$alg,
's|status' => \$status, 'w|warn' => \$warn,
'h|help' => \$help, 'v|version' => \$version,
'U|UNIVERSAL' => \$UNIVERSAL,
'0|01' => \$BITS,
'p|portable' => \$portable,
) or usage(1, "");
## Deal with help requests and incorrect uses
usage(0)
if $help;
usage(1, "sha3sum: Ambiguous file mode\n")
if scalar(grep {defined $_}
($binary, $portable, $text, $BITS, $UNIVERSAL)) > 1;
usage(1, "sha3sum: --warn option used only when verifying checksums\n")
if $warn && !$check;
usage(1, "sha3sum: --status option used only when verifying checksums\n")
if $status && !$check;
## Default to SHA3-224 unless overridden by command line option
$alg = 224 unless defined $alg;
grep { $_ == $alg } (224, 256, 384, 512, 128000, 256000)
or usage(1, "sha3sum: Unrecognized algorithm\n");
## Display version information if requested
if ($version) {
print "$VERSION\n";
exit(0);
}
## Try to figure out if the OS is DOS-like. If it is,
## default to binary mode when reading files, unless
## explicitly overridden by command line "--text" or
## "--UNIVERSAL" or "--portable" options.
my $isDOSish = ($^O =~ /^(MSWin\d\d|os2|dos|mint|cygwin)$/);
if ($isDOSish) { $binary = 1 unless $text || $UNIVERSAL || $portable }
my $modesym = $binary ? '*' : ($UNIVERSAL ? 'U' :
($BITS ? '^' : ($portable ? '?' : ' ')));
## Read from STDIN (-) if no files listed on command line
@ARGV = ("-") unless @ARGV;
## sumfile($file): computes SHA-3 digest of $file
sub sumfile {
my $file = shift;
my $mode = $binary ? 'b' : ($UNIVERSAL ? 'U' :
($BITS ? '0' : ($portable ? 'p' : '')));
my $digest = eval { $module->new($alg)->addfile($file, $mode) };
if ($@) { warn "sha3sum: $file: $!\n"; return }
$digest->hexdigest;
}
## %len2alg: maps hex digest length to SHA-3 algorithm
my %len2alg = (56 => 224, 64 => 256, 96 => 384, 128 => 512,
336 => 128000, 272 => 256000);
## unescape: convert backslashed filename to plain filename
sub unescape {
$_ = shift;
s/\\\\/\0/g;
s/\\n/\n/g;
return if /\\/;
s/\0/\\/g;
return $_;
}
## verify: confirm the digest values in a checksum file
sub verify {
my $checkfile = shift;
my ($err, $fmt_errs, $read_errs, $match_errs) = (0, 0, 0, 0);
my ($num_lines, $num_files) = (0, 0);
my ($bslash, $sum, $fname, $rsp, $digest);
local *FH;
$checkfile eq '-' and open(FH, '< -')
and $checkfile = 'standard input'
or sysopen(FH, $checkfile, O_RDONLY)
or die "sha3sum: $checkfile: $!\n";
while (<FH>) {
next if /^#/; s/\n$//; s/^[ \t]+//; $num_lines++;
$bslash = s/^\\//;
($sum, $modesym, $fname) =
/^([\da-fA-F]+)[ \t]([ *?^U])([^\0]*)/;
$alg = defined $sum ? $len2alg{length($sum)} : undef;
$fname = unescape($fname) if defined $fname && $bslash;
if (grep { ! defined $_ } ($alg, $sum, $modesym, $fname)) {
$alg = 1 unless defined $alg;
warn("sha3sum: $checkfile: $.: improperly formatted" .
" SHA3-$alg checksum line\n") if $warn;
$fmt_errs++;
next;
}
$fname =~ s/\r$// unless -e $fname;
$rsp = "$fname: "; $num_files++;
($binary, $text, $UNIVERSAL, $BITS, $portable) =
map { $_ eq $modesym } ('*', ' ', 'U', '^', 'p');
unless ($digest = sumfile($fname)) {
$rsp .= "FAILED open or read\n";
$err = 1; $read_errs++;
}
else {
if (lc($sum) eq $digest) { $rsp .= "OK\n" }
else { $rsp .= "FAILED\n"; $err = 1; $match_errs++ }
}
print $rsp unless $status;
}
close(FH);
unless ($num_files) {
$alg = 1 unless defined $alg;
warn("sha3sum: $checkfile: no properly formatted " .
"SHA3-$alg checksum lines found\n");
$err = 1;
}
elsif (! $status) {
warn("sha3sum: WARNING: $fmt_errs line" . ($fmt_errs>1?
's are':' is') . " improperly formatted\n") if $fmt_errs;
warn("sha3sum: WARNING: $read_errs listed file" .
($read_errs>1?'s':'') . " could not be read\n") if $read_errs;
warn("sha3sum: WARNING: $match_errs computed checksum" .
($match_errs>1?'s':'') . " did NOT match\n") if $match_errs;
}
return($err == 0);
}
## Verify or compute SHA-3 checksums of requested files
my($file, $digest);
my $STATUS = 0;
for $file (@ARGV) {
if ($check) { $STATUS = 1 unless verify($file) }
elsif ($digest = sumfile($file)) {
if ($file =~ /[\n\\]/) {
$file =~ s/\\/\\\\/g; $file =~ s/\n/\\n/g;
$digest = "\\$digest";
}
print "$digest $modesym", "$file\n";
}
else { $STATUS = 1 }
}
exit($STATUS)