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# Copyright (C) 2015 JWCrypto Project Contributors - see LICENSE file
from base64 import urlsafe_b64encode, urlsafe_b64decode
# Padding stripping versions as described in
# draft-ietf-jose-json-web-signature-41 appendix C
def base64url_encode(payload):
return urlsafe_b64encode(payload).rstrip('=')
def base64url_decode(payload):
l = len(payload) % 4
if l == 2:
payload += '=='
elif l == 3:
payload += '='
elif l != 0:
raise ValueError('Invalid base64 string')
return urlsafe_b64decode(payload)
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