ITS#6826 conversion scripts

These were provided as part of the original ITS but not previously committed.
Perl scripts to convert between Apache and OpenLDAP hash formats.

contrib/slapd-modules/passwd/apr1-atol.pl

+#!/usr/bin/perl -w
+
+# Apache $apr1$ to OpenLDAP {APR1} hash converter
+# (C) 2011 Devin J. Pohly
+# You may use this code freely.  It would be nice to be credited.
+
+use MIME::Base64;
+
+while (<>) {
+	($user, $hash) = split(/:/, $_);
+	unless ($hash =~ /^\$apr1\$/) {
+		print STDERR "Not an Apache MD5 hash\n";
+		exit 1;
+	}
+
+	chomp $hash;
+	($_,$_,$salt,$hash) = split(/\$/, $hash);
+
+	$hash =~ tr|./0-9A-Za-z|A-Za-z0-9+/|;
+	$hash .= "AA";
+	$hash =~ s/(.)(.)(.)(.)/$4$3$2$1/gs;
+	$hash = decode_base64($hash);
+	$hash =~ s/(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)..(.)/$1$4$7$10$13$15$2$5$8$11$14$16$3$6$9$12/s;
+	$hash .= $salt;
+	$hash = encode_base64($hash);
+	chop $hash;
+
+	print "$user:{APR1}$hash\n";
+}
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contrib/slapd-modules/passwd/apr1-ltoa.pl

+#!/usr/bin/perl -w
+
+# OpenLDAP {APR1} to Apache $apr1$ hash converter
+# (C) 2011 Devin J. Pohly
+# You may use this code freely.  It would be nice to be credited.
+
+use MIME::Base64;
+
+while (<>) {
+	($user, $hash) = split(/:/, $_);
+	unless ($hash =~ /^{APR1}/) {
+		print STDERR "Not an Apache MD5 hash\n";
+		next;
+	}
+
+	chomp $hash;
+	$hash = decode_base64(substr($hash, 6));
+	($hash, $salt) = (substr($hash, 0, 16), substr($hash, 16));
+	$hash = $hash;
+	$hash =~ s/(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)/$1$7$13$2$8$14$3$9$15$4$10$16$5$11$6\0\0$12/s;
+	$hash = encode_base64($hash);
+	chomp $hash;
+	$hash =~ s/(.)(.)(.)(.)/$4$3$2$1/gs;
+	unless ($hash =~ /AA$/) {
+		#print "Problem with hash\n";
+		next;
+	}
+	$hash =~ s/AA$//;
+	$hash =~ tr|A-Za-z0-9+/|./0-9A-Za-z|;
+	print "$user:\$apr1\$$salt\$$hash\n"
+}
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