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- #!/usr/bin/perl
- eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
- if $running_under_some_shell;
- #!perl -w
-
- # shasum: filter for computing SHA digests (analogous to sha1sum)
- #
- # Copyright (C) 2003-2007 Mark Shelor, All Rights Reserved
- #
- # Version: 5.45
- # Tue Jun 26 02:36:00 MST 2007
-
- =head1 NAME
-
- shasum - Print or Check SHA Checksums
-
- =head1 SYNOPSIS
-
- Usage: shasum [OPTION] [FILE]...
- or: shasum [OPTION] --check [FILE]
- Print or check SHA checksums.
- With no FILE, or when FILE is -, read standard input.
-
- -a, --algorithm 1 (default), 224, 256, 384, 512
- -b, --binary read files in binary mode (default on DOS/Windows)
- -c, --check check SHA sums against given list
- -p, --portable read files in portable mode
- produces same digest on Windows/Unix/Mac
- -t, --text read files in text mode (default)
-
- 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 SHA checksum lines
-
- -h, --help display this help and exit
- -v, --version output version information and exit
-
- The sums are computed as described in FIPS PUB 180-2. 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 portable, ` ' for text), and name for each FILE.
-
- =head1 DESCRIPTION
-
- The I<shasum> script provides the easiest and most convenient way to
- compute SHA message digests. Rather than writing a program, the user
- simply feeds data to the script via the command line, and waits for
- the results to be printed on standard output. Data can be fed to
- I<shasum> through files, standard input, or both.
-
- The following command shows how easy it is to compute digests for typical
- inputs such as the NIST test vector "abc":
-
- perl -e "print qw(abc)" | shasum
-
- Or, if you want to use SHA-256 instead of the default SHA-1, simply say:
-
- perl -e "print qw(abc)" | shasum -a 256
-
- Since I<shasum> uses the same interface employed by the familiar
- I<sha1sum> program (and its somewhat outmoded anscestor I<md5sum>),
- you can install this script as a convenient drop-in replacement.
-
- =head1 AUTHOR
-
- Copyright (c) 2003-2007 Mark Shelor <mshelor@cpan.org>.
-
- =head1 SEE ALSO
-
- shasum is implemented using the Perl module L<Digest::SHA> or
- L<Digest::SHA::PurePerl>.
-
- =cut
-
- use strict;
- use FileHandle;
- use Getopt::Long;
-
- my $VERSION = "5.45";
-
-
- # Try to use Digest::SHA, since it's faster. If not installed,
- # use 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 $@;
- }
-
-
- # Usage statement adapted from Ulrich Drepper's md5sum.
- # Include an "-a" option for algorithm selection,
- # and a "-p" option for portable digest computation.
-
- sub usage {
- my($err, $msg) = @_;
-
- $msg = "" unless defined $msg;
- if ($err) {
- warn($msg . "Type shasum -h for help\n");
- exit($err);
- }
- print <<'END_OF_USAGE';
- Usage: shasum [OPTION] [FILE]...
- or: shasum [OPTION] --check [FILE]
- Print or check SHA checksums.
- With no FILE, or when FILE is -, read standard input.
-
- -a, --algorithm 1 (default), 224, 256, 384, 512
- -b, --binary read files in binary mode (default on DOS/Windows)
- -c, --check check SHA sums against given list
- -p, --portable read files in portable mode
- produces same digest on Windows/Unix/Mac
- -t, --text read files in text mode (default)
-
- 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 SHA checksum lines
-
- -h, --help display this help and exit
- -v, --version output version information and exit
-
- The sums are computed as described in FIPS PUB 180-2. 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 portable, ` ' for text), and name for each FILE.
-
- Report bugs to <mshelor@cpan.org>.
- END_OF_USAGE
- exit($err);
- }
-
-
- # Collect options from command line
-
- my ($alg, $binary, $check, $text, $status, $warn, $help, $version);
- my ($portable);
-
- 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
- ) 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)) > 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 overriden by command line option
-
- $alg = 1 unless $alg;
- grep { $_ == $alg } (1, 224, 256, 384, 512)
- or usage(1, "shasum: Unrecognized algorithm\n");
-
-
- # Display version information if requested
-
- if ($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 overriden 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 ? '?' : ' ');
-
-
- # 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' : '');
- my $digest = eval { $module->new($alg)->addfile($file, $mode) };
- if ($@) {
- warn "shasum: $file: $!\n";
- return;
- }
-
- $digest->hexdigest;
- }
-
-
- # %len2alg: maps hex digest length to SHA algorithm
-
- my %len2alg = (40 => 1, 56 => 224, 64 => 256, 96 => 384, 128 => 512);
-
-
- # Verify checksums if requested
-
- if ($check) {
- my $checkfile = shift(@ARGV);
- my ($err, $read_errs, $match_errs) = (0, 0, 0);
- my ($num_files, $num_checksums) = (0, 0);
- my ($fh, $sum, $fname, $rsp, $digest);
-
- die "shasum: $checkfile: $!\n"
- unless $fh = FileHandle->new($checkfile, "r");
- while (<$fh>) {
- s/\s+$//;
- ($sum, $modesym, $fname) = /^(\S+) (.)(.*)$/;
- ($binary, $portable, $text) =
- map { $_ eq $modesym } ('*', '?', ' ');
- unless ($alg = $len2alg{length($sum)}) {
- warn("shasum: $checkfile: $.: improperly " .
- "formatted SHA checksum line\n") if $warn;
- next;
- }
- $rsp = "$fname: "; $num_files++;
- unless ($digest = sumfile($fname)) {
- $rsp .= "FAILED open or read\n";
- $err = 1; $read_errs++;
- }
- else {
- $num_checksums++;
- if (lc($sum) eq $digest) { $rsp .= "OK\n" }
- else { $rsp .= "FAILED\n"; $err = 1; $match_errs++ }
- }
- print $rsp unless $status;
- }
- $fh->close;
- unless ($status) {
- warn("shasum: WARNING: $read_errs of $num_files listed " .
- "files could not be read\n") if $read_errs;
- warn("shasum: WARNING: $match_errs of $num_checksums " .
- "computed checksums did NOT match\n") if $match_errs;
- }
- exit($err);
- }
-
-
- # Compute and display SHA checksums of requested files
-
- my($file, $digest);
-
- for $file (@ARGV) {
- if ($digest = sumfile($file)) {
- print "$digest $modesym", "$file\n";
- }
- }
-