use hex encoding for all key selectors

DESCRIPTION

The PEM/MIME specification currently requires that all key selectors
except the serial number be printably encoded.  However, like the serial
number, all the other key selectors are just binary data to an
implementation.

The serial number is represented as a hex dump of its value.  This
representation was originally specified in RFC 1421, so for
compatibility the same representation was specified in PEM/MIME.

POSITION

Change the key selector to be represented in hexadecimal to be
consistent with the serial number.  This changes the BNF from:

    <keysel>        ::= <encbin>
                        ; a printably encoded non-null sequence of octets

to:

    <keysel>        ::= 1*<hexchar>
                        ; hex dump of the non-null sequence of octets

ACTION

If you disagree with this position you must send a message to the
pem-dev(_at_)tis(_dot_)com mailing list by 12am Saturday, December 24.