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Use a different ECC backend with a compatible serializer

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This library has the ``SEC1`` encoder which is compatible
with the serialization of ECC keys/points used in the Go libp2p impl
This commit is contained in:
Alex Stokes
2019-09-03 13:21:07 -07:00
parent eaeb36c1d9
commit 30456f8018
4 changed files with 39 additions and 23 deletions
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16
libp2p/crypto/key_exchange.py
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@ -1,9 +1,8 @@
from typing import Callable, Tuple, cast
from Crypto.Math.Numbers import Integer
import Crypto.PublicKey.ECC as ECC
from fastecdsa.encoding.util import int_bytelen
from libp2p.crypto.ecc import ECCPrivateKey, create_new_key_pair
from libp2p.crypto.ecc import ECCPrivateKey, ECCPublicKey, create_new_key_pair
from libp2p.crypto.keys import PublicKey
SharedKeyGenerator = Callable[[bytes], bytes]
@ -19,11 +18,12 @@ def create_ephemeral_key_pair(curve_type: str) -> Tuple[PublicKey, SharedKeyGene
key_pair = create_new_key_pair(curve_type)
def _key_exchange(serialized_remote_public_key: bytes) -> bytes:
remote_public_key = ECC.import_key(serialized_remote_public_key)
curve_point = remote_public_key.pointQ
private_key = cast(ECCPrivateKey, key_pair.private_key)
secret_point = curve_point * private_key.impl.d
byte_size = secret_point.size_in_bytes()
return cast(Integer, secret_point.x).to_bytes(byte_size)
remote_point = ECCPublicKey.from_bytes(serialized_remote_public_key, curve_type)
secret_point = remote_point.impl * private_key.impl
secret_x_coordinate = secret_point.x
byte_size = int_bytelen(secret_x_coordinate)
return secret_x_coordinate.to_bytes(byte_size, byteorder="big")
return key_pair.public_key, _key_exchange