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encryption.py
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encryption.py
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import hashlib
import os
import base64
hash_algorithm = hashlib.sha512
def hash_hex(*all_bytes):
algorithm = hash_algorithm()
for bytes in all_bytes:
algorithm.update(bytes)
return algorithm.hexdigest()
def hash_binary(*all_bytes):
algorithm = hash_algorithm()
for bytes in all_bytes:
algorithm.update(bytes)
return algorithm.digest()
def _encrypt_password(password, salt, master_password):
assert isinstance(password, bytes)
assert isinstance(salt, bytes)
assert isinstance(master_password, bytes)
encryption_stream = hash_binary(master_password, salt) + \
hash_binary(salt, master_password)
assert len(encryption_stream) >= len(password)
encrypted_password = []
for i in range(len(password)):
encrypted_password.append(password[i] ^ encryption_stream[i])
return bytes(encrypted_password)
def encrypt_password(password, salt, master_password):
password = password.encode('UTF-8')
salt = salt.encode('UTF-8')
encrypted_password = _encrypt_password(password, salt, master_password)
decrypted_password = _encrypt_password(encrypted_password, salt, master_password)
assert decrypted_password == password
assert encrypted_password != decrypted_password
return base64.b64encode(encrypted_password).decode('UTF-8')
def decrypt_password(encrypted_password, salt, master_password):
encrypted_password = base64.b64decode(encrypted_password.encode('UTF-8'))
salt = salt.encode('UTF-8')
decrypted_password = _encrypt_password(encrypted_password, salt, master_password)
encrypted_password2 = _encrypt_password(decrypted_password, salt, master_password)
assert encrypted_password == encrypted_password2
assert encrypted_password != decrypted_password
return decrypted_password.decode('UTF-8')
def new_salt():
return hash_hex(os.urandom(20))
# "".join(map(chr, range(33, 127))) without "
PASSWORD_CHARACTERS = '''!#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~'''
character_ranges = lambda *ranges: ''.join(sum(map(lambda r: list(map(chr, range(ord(r[0]), ord(r[1]) + 1))), ranges), []))
def new_random_password(length = 25, characters = PASSWORD_CHARACTERS):
s = ""
assert 1 <= len(characters) <= 256
while len(s) < length:
index = ord(os.urandom(1))
if index >= len(characters):
continue
s += characters[index]
return s
__all__ = ['hash_hex', 'encrypt_password', 'decrypt_password', 'new_salt',
'new_random_password', character_ranges]