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#!/usr/bin/perl -w eval 'exec /usr/bin/perl -w -S $0 ${1+"$@"}' if 0; # not running under some shell ## shasum: filter for computing SHA digests (ref. sha1sum/md5sum) ## ## Copyright (C) 2003-2013 Mark Shelor, All Rights Reserved ## ## Version: 5.85 ## Wed Jun 26 04:05:26 MST 2013 ## shasum SYNOPSIS adapted from GNU Coreutils sha1sum. ## Add an "-a" option for algorithm selection, a "-p" ## option for portable digest computation, and a "-0" ## option for reading bit strings. my $POD = <<'END_OF_POD'; =head1 NAME shasum - Print or Check SHA Checksums =head1 SYNOPSIS Usage: shasum [OPTION]... [FILE]... Print or check SHA checksums. With no FILE, or when FILE is -, read standard input. -a, --algorithm 1 (default), 224, 256, 384, 512, 512224, 512256 -b, --binary read in binary mode -c, --check read SHA sums from the FILEs and check them -t, --text read in text mode (default) -p, --portable read in portable 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 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 When verifying SHA-512/224 or SHA-512/256 checksums, indicate the algorithm explicitly using the -a option, e.g. shasum -a 512224 -c checksumfile The sums are computed as described in FIPS-180-4. 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, `?' for portable, `^' for BITS), and name for each FILE. Report shasum bugs to mshelor@cpan.org =head1 DESCRIPTION Running I<shasum> is often the quickest way to compute SHA 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)" | shasum Or, if you want to use SHA-256 instead of the default SHA-1, simply say: perl -e "print qq(abc)" | shasum -a 256 Since I<shasum> mimics the behavior of the combined GNU I<sha1sum>, I<sha224sum>, I<sha256sum>, I<sha384sum>, and I<sha512sum> programs, you can install this script as a convenient drop-in replacement. Unlike the GNU programs, I<shasum> encompasses the full SHA standard by allowing partial-byte inputs. This is accomplished through the BITS option (I<-0>). The following example computes the SHA-224 digest of the 7-bit message I<0001100>: perl -e "print qq(0001100)" | shasum -0 -a 224 =head1 AUTHOR Copyright (c) 2003-2013 Mark Shelor <mshelor@cpan.org>. =head1 SEE ALSO I<shasum> is implemented using the Perl module L<Digest::SHA> or L<Digest::SHA::PurePerl>. =cut END_OF_POD use strict; use Fcntl; use Getopt::Long; my $VERSION = "5.85"; ## Try to use Digest::SHA. If not installed, use the slower ## but functionally equivalent Digest::SHA::PurePerl instead. my $MOD_PREFER = "Digest::SHA"; my $MOD_SECOND = "Digest::SHA::PurePerl"; 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 $@; } sub usage { my($err, $msg) = @_; $msg = "" unless defined $msg; if ($err) { warn($msg . "Type shasum -h for help\n"); exit($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); 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, 'p|portable' => \$portable, '0|01' => \$BITS ) or usage(1, ""); ## Deal with help requests and incorrect uses usage(0) if $help; usage(1, "shasum: Ambiguous file mode\n") if scalar(grep {defined $_} ($binary, $portable, $text, $BITS)) > 1; usage(1, "shasum: --warn option used only when verifying checksums\n") if $warn && !$check; usage(1, "shasum: --status option used only when verifying checksums\n") if $status && !$check; ## Default to SHA-1 unless overridden by command line option $alg = 1 unless defined $alg; grep { $_ == $alg } (1, 224, 256, 384, 512, 512224, 512256) or usage(1, "shasum: Unrecognized algorithm\n"); ## Display version information if requested if ($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 ## "--portable" options. my $isDOSish = ($^O =~ /^(MSWin\d\d|os2|dos|mint|cygwin)$/); if ($isDOSish) { $binary = 1 unless $text || $portable } my $modesym = $binary ? '*' : ($portable ? '?' : ($BITS ? '^' : ' ')); ## Read from STDIN (-) if no files listed on command line @ARGV = ("-") unless @ARGV; ## sumfile($file): computes SHA digest of $file sub sumfile { my $file = shift; my $mode = $portable ? 'p' : ($binary ? 'b' : ($BITS ? '0' : '')); my $digest = eval { $module->new($alg)->addfile($file, $mode) }; if ($@) { warn "shasum: $file: $!\n"; return } $digest->hexdigest; } ## %len2alg: maps hex digest length to SHA algorithm my %len2alg = (40 => 1, 56 => 224, 64 => 256, 96 => 384, 128 => 512); $len2alg{56} = 512224 if $alg == 512224; $len2alg{64} = 512256 if $alg == 512256; ## 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 "shasum: $checkfile: $!\n"; while (<FH>) { next if /^#/; s/\n$//; s/^[ \t]+//; $num_lines++; $bslash = s/^\\//; ($sum, $modesym, $fname) = /^([\da-fA-F]+)[ \t]([ *?^])([^\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("shasum: $checkfile: $.: improperly " . "formatted SHA$alg checksum line\n") if $warn; $fmt_errs++; next; } $fname =~ s/\r$// unless -e $fname; $rsp = "$fname: "; $num_files++; ($binary, $portable, $text, $BITS) = map { $_ eq $modesym } ('*', '?', ' ', '^'); unless ($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("shasum: $checkfile: no properly formatted " . "SHA$alg checksum lines found\n"); $err = 1; } elsif (! $status) { warn("shasum: WARNING: $fmt_errs line" . ($fmt_errs>1? 's are':' is') . " improperly formatted\n") if $fmt_errs; warn("shasum: WARNING: $read_errs listed file" . ($read_errs>1?'s':'') . " could not be read\n") if $read_errs; warn("shasum: WARNING: $match_errs computed checksum" . ($match_errs>1?'s':'') . " did NOT match\n") if $match_errs; } return($err == 0); } ## Verify or compute SHA 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)
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