$Id: ToDo,v 1.20 2001/07/30 06:04:48 btrott Exp $

Crypt::OpenPGP todo
--------
xx * Crypt::OpenPGP main USAGE docs
xx * docs (for other classes)
* support for CAST5, ElGamal signing
xx * clear text signatures; need to make text into canonical text for
     signing
xx * more support for looking up keys in keyring (eg. look up userid, etc.)
* caching in find_keyblock. let caller pass in 'marker' code-ref that, given
  a packet, returns a unique 'marker' to point to that keyblock. eg. lookup
  by keyid returns the certificate keyid, lookup by userid returns the
  userid, etc. then, two levels of caching: 1) store offsets of keyblocks
  by marker; 2) store already-parsed keyblocks by marker. we could let the
  calling function do the latter, of course, ie. find_keyblock_by_keyid
  would manage a hash of keyids => keyblocks. also: when reading a keyblock
  (after already finding the start offset), maybe don't parse SECRET_KEY
  and PUBLIC_KEY packets? since we already have the start cert there is
  no use in parsing the next one we come to, because that indicates the
  start of a new keyblock.
xx* compatibility param to encrypt and sign (and keygen, maybe), eg.
    Compat => 'PGP2' turns on Version => 3 and Cipher => 'IDEA'
* smart detection and description of arbitrary files, eg. pass in some
  data and give back 'RSA signed message, Version 3, probably PGP2'
xx * compressed packets
xx * symmetrically-encrypted encrypted data packets
* subkey generation
* encrypted MDC packets
xx * make find_keyblock_by_keyid work with subkeys
xx * key generation, secret certificate saving and encrypting
xx * Crypt::OpenPGP high-level DWIM interface
xx * support for armouring
xx * support for writing packets (v4 fingerprints/key IDs will come with this)
* keyblock merging keys, signatures, user IDs
xx * implement a KeyRing::find method that looks only for specific key IDs, etc.
xx * generate fingerprint on cert while reading in (in 'parse'); that way we
     don't have to reserialize
* Crypt::OpenPGP::Plaintext::encrypt should encrypt data and return a
  Crypt::OpenPGP::Ciphertext packet
* test suite: tests for: compressed signatures, compressed encrypted data
  packets, more versions of PGP, more pkalgs, subpackets
* improve subpacket system: constants for types, better integration into
  signatures, etc.
xx * better installation: determine prereqs based on answers to prompts
     about preferred ciphers, pk systems, etc.
* use key flags to determine "what a key can do" (ie. signing, encryption)
* support writing v4 packet headers
* add some example scripts
* improve CRC24 implementation by using C implementation. problem:
  String::CRC does not work for me (doesn't accept init, for one thing).
