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_os.py	2.24 KB	-rw-r--r--
archive.py	7.88 KB	-rw-r--r--
asyncio.py	1.29 KB	-rw-r--r--
autoreload.py	23.67 KB	-rw-r--r--
baseconv.py	2.92 KB	-rw-r--r--
cache.py	15.88 KB	-rw-r--r--
connection.py	2.19 KB	-rw-r--r--
crypto.py	3.07 KB	-rw-r--r--
datastructures.py	9.66 KB	-rw-r--r--
dateformat.py	9.97 KB	-rw-r--r--
dateparse.py	4.78 KB	-rw-r--r--
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duration.py	1.21 KB	-rw-r--r--
encoding.py	9.2 KB	-rw-r--r--
feedgenerator.py	14.75 KB	-rw-r--r--
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functional.py	13.81 KB	-rw-r--r--
hashable.py	706 B	-rw-r--r--
html.py	15.19 KB	-rw-r--r--
http.py	17.29 KB	-rw-r--r--
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text.py	15.49 KB	-rw-r--r--
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topological_sort.py	1.18 KB	-rw-r--r--
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Code Editor : crypto.py

"""
Django's standard crypto functions and utilities.
"""
import hashlib
import hmac
import secrets
import warnings

from django.conf import settings
from django.utils.deprecation import RemovedInDjango40Warning
from django.utils.encoding import force_bytes

class InvalidAlgorithm(ValueError):
    """Algorithm is not supported by hashlib."""
    pass

def salted_hmac(key_salt, value, secret=None, *, algorithm='sha1'):
    """
    Return the HMAC of 'value', using a key generated from key_salt and a
    secret (which defaults to settings.SECRET_KEY). Default algorithm is SHA1,
    but any algorithm name supported by hashlib can be passed.

A different key_salt should be passed in for every application of HMAC.
    """
    if secret is None:
        secret = settings.SECRET_KEY

key_salt = force_bytes(key_salt)
    secret = force_bytes(secret)
    try:
        hasher = getattr(hashlib, algorithm)
    except AttributeError as e:
        raise InvalidAlgorithm(
            '%r is not an algorithm accepted by the hashlib module.'
            % algorithm
        ) from e
    # We need to generate a derived key from our base key.  We can do this by
    # passing the key_salt and our base key through a pseudo-random function.
    key = hasher(key_salt + secret).digest()
    # If len(key_salt + secret) > block size of the hash algorithm, the above
    # line is redundant and could be replaced by key = key_salt + secret, since
    # the hmac module does the same thing for keys longer than the block size.
    # However, we need to ensure that we *always* do this.
    return hmac.new(key, msg=force_bytes(value), digestmod=hasher)

NOT_PROVIDED = object()  # RemovedInDjango40Warning.
RANDOM_STRING_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'

# RemovedInDjango40Warning: when the deprecation ends, replace with:
#   def get_random_string(length, allowed_chars=RANDOM_STRING_CHARS):
def get_random_string(length=NOT_PROVIDED, allowed_chars=RANDOM_STRING_CHARS):
    """
    Return a securely generated random string.

The bit length of the returned value can be calculated with the formula:
        log_2(len(allowed_chars)^length)

For example, with default `allowed_chars` (26+26+10), this gives:
      * length: 12, bit length =~ 71 bits
      * length: 22, bit length =~ 131 bits
    """
    if length is NOT_PROVIDED:
        warnings.warn(
            'Not providing a length argument is deprecated.',
            RemovedInDjango40Warning,
        )
        length = 12
    return ''.join(secrets.choice(allowed_chars) for i in range(length))

def constant_time_compare(val1, val2):
    """Return True if the two strings are equal, False otherwise."""
    return secrets.compare_digest(force_bytes(val1), force_bytes(val2))

def pbkdf2(password, salt, iterations, dklen=0, digest=None):
    """Return the hash of password using pbkdf2."""
    if digest is None:
        digest = hashlib.sha256
    dklen = dklen or None
    password = force_bytes(password)
    salt = force_bytes(salt)
    return hashlib.pbkdf2_hmac(digest().name, password, salt, iterations, dklen)

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Code Editor : crypto.py