pass

#!/bin/env python3
import string
from getpass import getpass
from hashlib import sha512

def_charset = string.ascii_letters + string.digits + string.punctuation
def_length = 32
header = 'PASS - password generator'

print('*'*len(header))
print(header)
print('*'*len(header))

def repeated_input(prompt):
    rv = ""
    while not rv: rv = input(prompt)
    return rv

def repeated_input_hidden(prompt):
    rv = ""
    while not rv: rv = getpass(prompt=prompt)
    return rv

specific_key = repeated_input('enter specific key: ')
generic_key = repeated_input_hidden('enter secret generic key: ')
d_generic_key = repeated_input_hidden('confirm secret generic key: ')

if generic_key != d_generic_key:
    print('generic key doesnt match')
    exit(1)

charset = input(f'enter allowed character set (default = \'{def_charset}\'): ').strip()
length = input(f'enter length of password (default = {def_length}): ').strip()

length = int(length) if length else def_length
charset = charset if charset else def_charset

if len(charset) > 256:
    print('charset cannot be longer than 256 characters, taking first 256 values')
    charset = charset[:256]

salted = ( generic_key * len(specific_key) ) + ( specific_key * len(generic_key) )
password = ''
hashobj = sha512(salted.encode())
charset_len = len(charset)
while len(password) < length:
    for byte in hashobj.digest():
        ind = byte % charset_len
        password += charset[ind]
        if len(password) > length:
            break
    hashobj.update(salted.encode())
password = password[:length]

#print(password)
import pyperclip # install pyperclip
pyperclip.copy(password)
print('password copied to clipboard')