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#!/usr/bin/perl -w
use strict;
use Getopt::Long qw(:config no_ignore_case);
use Pod::Usage;
use Digest::SHA;
use MIME::Base64;
use Math::Random::Secure qw(irand);
my %opts;
GetOptions(\%opts,
qw[ help|?! man! f|format=s l|len=i s|salt=s S|Salt=s z|saltlen:i ]
) or pod2usage(2);
pod2usage(1) if $opts{help};
pod2usage(-verbose => 2) if $opts{man};
my $len = 256;
if (exists $opts{l}) {
my @length = (224, 256, 384, 512);
if (grep {$_ eq $opts{l}} @length) {
$len = $opts{l};
} else {
print "Bad length\n";
exit(1);
}
}
sub fmt_base64 {
return encode_base64(shift, '')."\n";
}
sub fmt_hex {
return unpack('H*', shift)."\n";
}
sub fmt_bin {
return shift;
}
my $fmt = \&{'fmt_base64'};
if (exists $opts{f}) {
my %format = ('m' => \&{'fmt_base64'}, 'base64' => \&{'fmt_base64'},
'x' => \&{'fmt_hex'}, 'hex' => \&{'fmt_hex'},
'b' => \&{'fmt_bin'}, 'bin' => \&{'fmt_bin'});
$fmt = $format{$opts{f}};
if (!defined $fmt) {
print "Bad format\n";
exit(1);
}
}
my $password = $ARGV[0];
if (!defined $password) {
print "Missing password\n";
exit(1);
}
my $salt = $opts{s};
if (exists $opts{S}) {
if (defined $salt) {
print "Redundant salt\n";
exit(1);
}
$salt = pack('H*', $opts{S});
} elsif (!defined $salt and exists $opts{z}) {
my $ssiz = $opts{z};
if ($ssiz == 0) {
$ssiz = 8;
} elsif ($ssiz < 0) {
print "Bad salt length\n";
exit(1);
}
while ($ssiz >= 4) {
$salt .= pack('N', irand());
$ssiz -= 4;
}
$salt .= substr(pack('N', irand()), 1, $ssiz) if ($ssiz > 0);
}
my $ctx = Digest::SHA->new($len);
$ctx->add($password);
$ctx->add($salt) if (defined $salt);
my $dig = $ctx->digest;
$dig .= $salt if (defined $salt);
print &$fmt($dig);
__END__
=head1 NAME
ssha2passwd - Generate a SHA2 hashed password
=head1 DESCRIPTION
Hash the given password into a SHA2 digest with optional salt.
=head1 SYNOPSIS
ssha2passwd [options] <password>
=head1 OPTIONS
=over
=item B<-f> or B<-format> <format>
Format options:
=over
=item B<m> or B<base64> : base64 encoded (default)
=item B<x> or B<hex> : hexadecimal string
=item B<b> or B<bin> : binary string
=back
=item B<-l> or B<-length> <length>
Hash algorithm bit length (224, 256, 384, or 512 | default: 256).
=item B<-s> or B<-salt> <string>
=item B<-S> or B<-Salt> <hexadecimal string>
Salt string appended to password and hashed. The resultant digest then
has the salt string appended.
=item B<-z> or B<-saltlen> [<length>]
Byte length of random salt appended to password and hashed, if no salt
string is explicitly given (0 is default, default: 8).
=item B<-?> or B<-help>
Print a brief help message.
=item B<-man>
Print the manual page.
=back
=cut
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