Wrong DS-code and key if algorithm > 9

[webservicebe]

line 67 of dnssec-key2ds/dnssec_key2ds.php
$algorithm_hex = sprintf("%02d", dechex($algorithm));

If algorithm 13 is used you end-up with "00" instead of "0d"
Correct by replacing line 67 to:
$algorithm_hex = '0'.dechex($algorithm);

[metaregistrar]

Even better:
$algorithm_hex = sprintf("%02x", $algorithm);

There is a hex function in sprintf, you know. When the algorithms will surpass 15, this will still work.

Best do it for all functions at once:
$flags_hex = sprintf("%04x", $flags);
$protocol_hex = sprintf("%02x", $protocol);
$algorithm_hex = sprintf("%02x", $algorithm);