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import base64
import binascii
def b64urldecode(data):
"""Decodes an unpadded Base64url-encoded string.
:param data: data bytes to decode
:type data: bytes
:returns bytes
"""
return base64.urlsafe_b64decode(data + b"===="[len(data) % 4:])
def b64urlencode(data):
"""Encode a byte string into a Base64url-encoded string without padding
:param data: data bytes to encode
:type data: bytes
:returns str
"""
return base64.urlsafe_b64encode(data).replace(b'=', b'').decode('utf8')
def num_to_bytes(n, pad_to):
"""Returns the byte representation of an integer, in big-endian order.
:param n: The integer to encode.
:type n: int
:param pad_to: Expected length of result, zeropad if necessary.
:type pad_to: int
:returns bytes
"""
h = '%x' % n
r = binascii.unhexlify('0' * (len(h) % 2) + h)
return b'\x00' * (pad_to - len(r)) + r
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