def _get_gen_size(self, params, default_size=None):
size = default_size
if 'size' in params:
size = params.pop('size')
elif 'alg' in params:
try:
from jwcrypto.jwa import JWA
alg = JWA.instantiate_alg(params['alg'])
except KeyError:
raise ValueError("Invalid 'alg' parameter")
size = alg.keysize
return size
def _jwa_enc(self, name):
allowed = self._allowed_algs or default_allowed_algs
if name not in allowed:
raise InvalidJWEOperation('Algorithm not allowed')
return JWA.encryption_alg(name)
def _jwa(self, name, allowed):
if allowed is None:
allowed = default_allowed_algs
if name not in allowed:
raise InvalidJWSOperation('Algorithm not allowed')
return JWA.signing_alg(name)
