def decode(buffer: bytes):
from samson.public_key.ecdsa import ECDSA
cert, _left_over = decoder.decode(buffer,
asn1Spec=rfc2459.Certificate())
pub_info = cert['tbsCertificate']['subjectPublicKeyInfo']
curve_params, _ = decoder.decode(
Bytes(pub_info['algorithm']['parameters']))
p = int(curve_params[1][1])
b = Bytes(curve_params[2][1]).int()
q = int(curve_params[4])
gx, gy = ECDSA.decode_point(Bytes(curve_params[3]))
curve = WeierstrassCurve(a=-3,
b=b,
ring=ZZ / ZZ(p),
cardinality=q,
base_tuple=(gx, gy))
x, y = ECDSA.decode_point(Bytes(int(pub_info['subjectPublicKey'])))
ecdsa = ECDSA(curve.G, None, d=1)
ecdsa.Q = curve(x, y)
return ecdsa
def parse_ec_params(items, curve_idx, pub_point_idx):
from samson.public_key.ecdsa import ECDSA
curve_oid = items[curve_idx].asTuple()
oid_bytes = ber_encoder.encode(ObjectIdentifier(curve_oid))[2:]
curve = WS_OID_LOOKUP[oid_bytes]
x_y_bytes = Bytes(int(items[pub_point_idx]))
x, y = ECDSA.decode_point(x_y_bytes)
return x, y, curve
def decode(buffer: bytes, **kwargs):
from samson.public_key.ecdsa import ECDSA
_, pub = parse_openssh_key(buffer, SSH_PUBLIC_HEADER, ECDSAPublicKey,
ECDSAPrivateKey, None)
curve, x_y_bytes, d = pub.curve, pub.x_y_bytes, 1
curve = SSH_INVERSE_CURVE_LOOKUP[curve.decode()]
ecdsa = ECDSA(G=curve.G, hash_obj=None, d=d)
ecdsa.Q = curve(*ECDSA.decode_point(x_y_bytes))
return ecdsa
def decode(buffer: bytes, **kwargs):
from samson.public_key.ecdsa import ECDSA
items = bytes_to_der_sequence(buffer)
curve_oid = items[1][1].asTuple()
params, _ = decoder.decode(bytes(items[2]))
d = Bytes(params[1]).int()
x, y = ECDSA.decode_point(Bytes(int(params[2])))
oid_bytes = ber_encoder.encode(ObjectIdentifier(curve_oid))[2:]
curve = WS_OID_LOOKUP[oid_bytes]
ecdsa = ECDSA(d=d, G=curve.G)
ecdsa.Q = curve(x, y)
return ecdsa