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"""LICENSE 

Copyright 2019 Hermann Krumrey <hermann@krumreyh.com> 

 

This file is part of puffotter. 

 

puffotter is free software: you can redistribute it and/or modify 

it under the terms of the GNU General Public License as published by 

the Free Software Foundation, either version 3 of the License, or 

(at your option) any later version. 

 

puffotter is distributed in the hope that it will be useful, 

but WITHOUT ANY WARRANTY; without even the implied warranty of 

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

GNU General Public License for more details. 

 

You should have received a copy of the GNU General Public License 

along with puffotter. If not, see <http://www.gnu.org/licenses/>. 

LICENSE""" 

 

import bcrypt 

import random 

import string 

 

 

def generate_random(length: int) -> str: 

""" 

Generates a random byte string consisting of alphanumeric characters 

Thanks @ Albert (https://stackoverflow.com/users/281021/albert) 

https://stackoverflow.com/questions/2257441 

:param length: The length of the string to generate 

:return: The generated random byte string 

""" 

return bytes( 

"".join(random.choice(string.ascii_uppercase + string.digits) 

for _ in range(length)), 

"utf-8" 

).decode("utf-8") 

 

 

def generate_hash(password: str) -> str: 

""" 

Salts and hashes a password to generate a hash for storage in a database 

:param password: The password to hash 

:return: The hash of the password 

""" 

password = bytes(password, "utf-8") 

return bcrypt.hashpw(password, bcrypt.gensalt()).decode("utf-8") 

 

 

def verify_password(password: str, hashed: str): 

""" 

Verifies that a password matches a given hash 

:param password: The password to verify 

:param hashed: The hash to verify the password against 

:return: True if the password matches, otherwise False 

""" 

password = bytes(password, "utf-8") 

hashed = bytes(hashed, "utf-8") 

 

try: 

return bcrypt.checkpw(password, hashed) 

except ValueError: 

return False