def decode(buffer: bytes, **kwargs) -> object:
"""
Decodes a JWK JSON string into EdDSA parameters.
Parameters:
buffer (bytes/str): JWK JSON string.
Returns:
EdDSA: EdDSA object.
"""
from samson.public_key.eddsa import EdDSA
from samson.protocols.dh25519 import DH25519
if issubclass(type(buffer), (bytes, bytearray)):
buffer = buffer.decode()
jwk = json.loads(buffer)
curve = JWK_INVERSE_CURVE_LOOKUP[jwk['crv']]
x = Bytes(url_b64_decode(jwk['x'].encode('utf-8')), 'little')
if 'd' in jwk:
d = Bytes(url_b64_decode(jwk['d'].encode('utf-8'))).int()
else:
d = 0
if jwk['crv'] in ['Ed25519', 'Ed448']:
eddsa = EdDSA(curve=curve, d=d)
eddsa.A = eddsa.decode_point(x)
else:
eddsa = DH25519(curve=curve, d=d, pub=x.int())
return eddsa
def decode(buffer: bytes, **kwargs):
from samson.public_key.eddsa import EdDSA
items = bytes_to_der_sequence(buffer)
pub_point = Bytes(int(items[1]))
curve_oid = str(items[0][0])
curve = EDCURVE_OID_LOOKUP[curve_oid]
eddsa = EdDSA(curve=curve)
eddsa.A = eddsa.decode_point(pub_point)
return eddsa