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# Copyright (C) 2015 JWCrypto Project Contributors - see LICENSE file
import json
from base64 import urlsafe_b64decode, urlsafe_b64encode
# Padding stripping versions as described in
# RFC 7515 Appendix C
def base64url_encode(payload):
if not isinstance(payload, bytes):
payload = payload.encode('utf-8')
encode = urlsafe_b64encode(payload)
return encode.decode('utf-8').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.encode('utf-8'))
# JSON encoding/decoding helpers with good defaults
def json_encode(string):
if isinstance(string, bytes):
string = string.decode('utf-8')
return json.dumps(string, separators=(',', ':'), sort_keys=True)
def json_decode(string):
if isinstance(string, bytes):
string = string.decode('utf-8')
return json.loads(string)
class JWException(Exception):
pass
class InvalidJWAAlgorithm(JWException):
def __init__(self, message=None):
msg = 'Invalid JWA Algorithm name'
if message:
msg += ' (%s)' % message
super(InvalidJWAAlgorithm, self).__init__(msg)
class InvalidCEKeyLength(JWException):
"""Invalid CEK Key Length.
This exception is raised when a Content Encryption Key does not match
the required lenght.
"""
def __init__(self, expected, obtained):
msg = 'Expected key of length %d bits, got %d' % (expected, obtained)
super(InvalidCEKeyLength, self).__init__(msg)
class InvalidJWEOperation(JWException):
"""Invalid JWS Object.
This exception is raised when a requested operation cannot
be execute due to unsatisfied conditions.
"""
def __init__(self, message=None, exception=None):
msg = None
if message:
msg = message
else:
msg = 'Unknown Operation Failure'
if exception:
msg += ' {%s}' % repr(exception)
super(InvalidJWEOperation, self).__init__(msg)
class InvalidJWEKeyType(JWException):
"""Invalid JWE Key Type.
This exception is raised when the provided JWK Key does not match
the type required by the sepcified algorithm.
"""
def __init__(self, expected, obtained):
msg = 'Expected key type %s, got %s' % (expected, obtained)
super(InvalidJWEKeyType, self).__init__(msg)
class InvalidJWEKeyLength(JWException):
"""Invalid JWE Key Length.
This exception is raised when the provided JWK Key does not match
the lenght required by the sepcified algorithm.
"""
def __init__(self, expected, obtained):
msg = 'Expected key of lenght %d, got %d' % (expected, obtained)
super(InvalidJWEKeyLength, self).__init__(msg)