Generate password

genPw.py

# Copyright 2012 new013231@gmail.com
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

#!/usr/bin/env python 

import argparse
import hashlib
import base64
import re
import getpass
import pyperclip

def genPw(pw, usage):
    sha = hashlib.sha256(pw + usage).digest()
    pw = base64.b64encode(sha)[:16]
    if re.search('^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])[^+/]*$', pw):
	return pw
    else:
	return genPw(pw, usage)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(
	    description = 'Use base password and usage to generate password'
	    )
    parser.add_argument('-p', '--basePassword', dest='basePw'
	    , metavar = 'basePassword', help = 'Your base password.')
    parser.add_argument('usage', nargs = '?', metavar = 'usage'
	    , help = 'Usage.')
    parser.add_argument('-n', action = 'store_false', dest = 'c2cb'
	    , help = "Do Not copy password to clipboard.")
    parser.add_argument('-v', '--version', action = 'version'
	    , version = '%(prog)s 0.42')

    args = parser.parse_args()

    if not args.basePw:
	args.rPwd = getpass.getpass('Base possward: ')

    if not args.usage:
	args.usage = raw_input('Usage: ')

    pwd = genPw(args.rPwd, args.usage)
    print pwd

    if args.c2cb:
	pyperclip.copy(pwd)