* format:
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | version number |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | number of keys |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Key data ...
* +-+-+-+-+-+-+-+
*
- * The version number is 1 at present. Version numbers higher than 1
- * indicate a keyfile that is not backwards compatible with this
- * specification.
+ * If the format ever needs to chanage incompatibly, a new file name
+ * will be used.
*
* Key data is a sequence of the following records (note that these are
* not word aligned - the next record begins where the previous one ends)