/usr/bin/sha1pass is in syslinux-utils 3:6.03+dfsg-11ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #!/usr/bin/perl
use bytes;
use Digest::SHA;
use MIME::Base64;
sub random_bytes($) {
my($n) = @_;
my($v, $i);
if ( open(RANDOM, '<', '/dev/random') ||
open(RANDOM, '<', '/dev/urandom') ) {
read(RANDOM, $v, $n);
} else {
# No real RNG available...
srand($$ ^ time);
$v = '';
for ( $i = 0 ; $i < $n ; $i++ ) {
$v .= ord(int(rand() * 256));
}
}
return $v;
}
($pass, $salt) = @ARGV;
unless (defined($salt)) {
$salt = MIME::Base64::encode(random_bytes(6), '');
}
$pass = Digest::SHA::sha1_base64($salt, $pass);
print '$4$', $salt, '$', $pass, "\$\n";
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