pwman3/documentation/general_notes.txt

# Work in progress


enc = CryptoEngine.get() in ui/cli.py (L:940)

is called before the db is even set !

when priniting nodes, decrypt is first called by:
this initializes CryptoEngine instance,
and sets the following instance properties:
    - _callback
    - _instance 
    - _keycrypted
    - _timeout
    - _cypher

this initialization asks the user for the decryption key
of the database. 

the action that user does called the respective db function which
returns an ENCRYPTED STRING!, 
which is then given to decryption via nodes.py or tags.py which do the
actual decryption on each decrypted string returned from the DB.

for example print_node:

initializing a _db instance, then we call _db.open()

calling do_print(10) calls _db.getnodes([i]) at this point
the database is still not decrypted ... e.g. _cypher is still empty

when _db.getnodes([i]) is done node inside  print_node is containing 
alot of encrypted string.

now print_node will be called, at which point the different methods
of node instance will decrypt their respective string:

e.g. get_username(self) instide nodes.py:
     
     self._username -> OexYH7vT/WVpXO0ZBM93RF/l8+o8/QU8ykgDB4qY8+BxBaKylAOeJWEQ+edjpLTU\n
     enc = CryptoEngine.get() 
     enc.decrypt(self._username) -> nahum.oz@gmail.com


to see this in work:
insert 
        import ipdb; ipdb.set_trace()
to def getnodes(self, ids) in "pwman/data/drivers/sqlite.py.

continue to pwman3/pwman/ui/cli.py(382) self.print_node(node[0])
and then step into this function. 
continue further into  def print_node(self, node) inside pwman3/pwman/ui/cli.py, 
finally you should step into:

    node.get_username()

# New features to implement:
  1. Password expiry date - register password date,  remind when password is about to expire.
  2. Make new passwords according to user defined rules. 

# build the package with 
  python setup.py sdist
# upload  
  python setup.py sdist upload

# PyCrypto Alternatives:

  * http://wiki.yobi.be/wiki/PyCryptoPlus#Differences_with_pycrypto
  *  http://brandon.sternefamily.net/2007/06/aes-tutorial-python-implementation/
  * puresalsa20 - not document so good
  * http://code.google.com/p/pycrypt/
  * https://github.com/trevp/tlslite/tree/master/tlslite/utils
  * seems like the best next standard, but very young:
    https://github.com/alex/cryptography
  * another salsa Alternative: www.seanet.com/~bugbee/crypto/salsa20/salsa20.pyb
   
# for windows port: https://pypi.python.org/pypi/colorama

# db ... https://github.com/coleifer/peewee
         http://sqlobject.org/
         http://www.sqlalchemy.org/

  
# when developing pwman3 you might be using a debugger. if so add the following 
  pre-commit hook to your .git/ :

$ cat .git/hooks/pre-commit 
#!/bin/bash
VAR=$(git diff --cached | grep "import ipdb; ipdb.set_trace")
if [ ! -z "$VAR" ]; then
  echo "You've left a BREAK POINT in one of your files! Aborting commit..."
  exit 1
fi 
exit 0