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// convert key to a byte array
                int len = key.Text.Length / 2;
...
                    k[i] = Convert.ToByte(key.Text.Substring(i * 2, 2)
+, 16);
                }
                summaryText += "key=" + key.Text.Trim() + "\r\n\r\n";

$key="AJDAHSDJ213718327DSFSDJFHSDKFJ87348171837"; #example
$len=length($key) / 2;
...
     for($i=0;$i<$len;$i++)      {
        $k[$i]= ?
      }