JDBC Security Realm mod_crypt and HEX encoding support.

The JDBC SecurityRealm support a variety of password mappers to load representations of a password from a database, many of these mappers load either hashed or digested representations of the password as well as any related salt from the database. Presently the hashes, digests and, salts are all assumed to be Base64 encoded.

This RFE is to add support for each of these to support hex encoding as an alternative encoding form.

For each password mapper that supports the loading of a digested password representation a new optional attribute hash-encoding will be added to specify the encoding used, this will default to base64 with an option to specify hex as an alternative encoding.

For each password mapper that supports loading a salt a new optional attribute salt-encoding will be added to specify the encoding of the salt, this will default to base64 with an option to specify hex as an alternative encoding.

Many password types can be encoded using modular crypt allowing their hashed encoding, salt, and iteration count if applicable to be combined and represented in a single String, the JDBC SecurityRealm implementation already supports mod_crypt encoded password however this is not presently exposed on the subsystem, this RFE will add a new password mapper to the principal-query to support the loading of modular crypt encoded passwords.

The new mapper will be called modular-crypt-mapper, the new mapper will contain a single: -