def _jwk_to_key(jwk):
if jwk['kty'] != 'EC':
raise exceptions.DXFUnexpectedKeyTypeError(jwk['kty'], 'EC')
if jwk['crv'] != 'P-256':
raise exceptions.DXFUnexpectedKeyTypeError(jwk['crv'], 'P-256')
# pylint: disable=bad-continuation
return ecdsa.VerifyingKey.from_public_point(
ecdsa.ellipticcurve.Point(ecdsa.NIST256p.curve,
_base64_to_num(jwk['x']),
_base64_to_num(jwk['y'])), ecdsa.NIST256p)
def _import_key(expkey):
if expkey['kty'] != 'EC':
raise exceptions.DXFUnexpectedKeyTypeError(expkey['kty'], 'EC')
if expkey['crv'] != 'P-256':
raise exceptions.DXFUnexpectedKeyTypeError(expkey['crv'], 'P-256')
return jwk.JWK(kty='EC', crv='P-256', x=expkey['x'], y=expkey['y'])