/usr/lib/python3/dist-packages/josepy/b64.py is in python3-josepy 1.1.0-2~deb9u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | """`JOSE Base64`_ is defined as:
- URL-safe Base64
- padding stripped
.. _`JOSE Base64`:
https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-37#appendix-C
.. Do NOT try to call this module "base64", as it will "shadow" the
standard library.
"""
import base64
import six
def b64encode(data):
"""JOSE Base64 encode.
:param data: Data to be encoded.
:type data: bytes
:returns: JOSE Base64 string.
:rtype: bytes
:raises TypeError: if ``data`` is of incorrect type
"""
if not isinstance(data, six.binary_type):
raise TypeError('argument should be {0}'.format(six.binary_type))
return base64.urlsafe_b64encode(data).rstrip(b'=')
def b64decode(data):
"""JOSE Base64 decode.
:param data: Base64 string to be decoded. If it's unicode, then
only ASCII characters are allowed.
:type data: bytes or unicode
:returns: Decoded data.
:rtype: bytes
:raises TypeError: if input is of incorrect type
:raises ValueError: if input is unicode with non-ASCII characters
"""
if isinstance(data, six.string_types):
try:
data = data.encode('ascii')
except UnicodeEncodeError:
raise ValueError(
'unicode argument should contain only ASCII characters')
elif not isinstance(data, six.binary_type):
raise TypeError('argument should be a str or unicode')
return base64.urlsafe_b64decode(data + b'=' * (4 - (len(data) % 4)))
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