105 lines
3.5 KiB
Python
105 lines
3.5 KiB
Python
# Copyright 2018 AT&T Intellectual Property. All other rights reserved.
|
|
#
|
|
# 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.
|
|
|
|
import random
|
|
import string
|
|
|
|
__all__ = ['CryptoString']
|
|
|
|
|
|
class CryptoString(object):
|
|
|
|
def __init__(self):
|
|
punctuation = '@#&-+=?'
|
|
self._pool = string.ascii_letters + string.digits + punctuation
|
|
self._random = random.SystemRandom()
|
|
|
|
def has_upper(self, crypto_str):
|
|
"""Check if string contains an uppercase letter
|
|
|
|
:param str crypto_str: The string to test.
|
|
:returns: True if string contains at least one uppercase letter.
|
|
:rtype: boolean
|
|
"""
|
|
|
|
return any(char in string.ascii_uppercase for char in crypto_str)
|
|
|
|
def has_lower(self, crypto_str):
|
|
"""Check if string contains a lowercase letter
|
|
|
|
:param str crypto_str: The string to test.
|
|
:returns: True if string contains at least one lowercase letter.
|
|
:rtype: boolean
|
|
"""
|
|
|
|
return any(char in string.ascii_lowercase for char in crypto_str)
|
|
|
|
def has_number(self, crypto_str):
|
|
"""Check if string contains a number
|
|
|
|
:param str crypto_str: The string to test.
|
|
:returns: True if string contains at least one number.
|
|
:rtype: boolean
|
|
"""
|
|
|
|
return any(char in string.digits for char in crypto_str)
|
|
|
|
def has_symbol(self, crypto_str):
|
|
"""Check if string contains a symbol
|
|
|
|
:param str crypto_str: The string to test.
|
|
:returns: True if string contains at least one symbol.
|
|
:rtype: boolean
|
|
"""
|
|
|
|
return any(char in string.punctuation for char in crypto_str)
|
|
|
|
def validate_crypto_str(self, crypto_str):
|
|
"""Ensure cryptostring contains characters from all sets
|
|
|
|
:param str crypto_str: The string to test.
|
|
:returns: True if string contains at least one each: uppercase letter,
|
|
lowercase letter, number and symbol
|
|
:rtype: boolean
|
|
"""
|
|
|
|
for test in [self.has_upper, self.has_lower, self.has_number,
|
|
self.has_symbol]:
|
|
if not test(crypto_str):
|
|
return False
|
|
|
|
return True
|
|
|
|
def get_crypto_string(self, length=24):
|
|
"""Create and return a random cryptographic string.
|
|
|
|
When the string is generated, it will be checked to determine if it
|
|
contains uppercase letters, lowercase letters, numbers and symbols.
|
|
If it does not contain at least one character from each set it will
|
|
be re-generated until it does.
|
|
|
|
:param int length: Length of crypto string to generate. If this length
|
|
is smaller than 24, or not defined, the length will default to 24.
|
|
:returns: The generated cryptographic string
|
|
:rtype: string
|
|
"""
|
|
|
|
while True:
|
|
crypto_str = ''.join(self._random.choice(self._pool)
|
|
for _ in range(max(24, length)))
|
|
if self.validate_crypto_str(crypto_str):
|
|
break
|
|
|
|
return crypto_str
|