py-libp2p/libp2p/crypto/serialization.py

from libp2p.crypto.ed25519 import Ed25519PrivateKey, Ed25519PublicKey
from libp2p.crypto.exceptions import MissingDeserializerError
from libp2p.crypto.keys import KeyType, PrivateKey, PublicKey
from libp2p.crypto.rsa import RSAPublicKey
from libp2p.crypto.secp256k1 import Secp256k1PrivateKey, Secp256k1PublicKey

key_type_to_public_key_deserializer = {
    KeyType.Secp256k1.value: Secp256k1PublicKey.from_bytes,
    KeyType.RSA.value: RSAPublicKey.from_bytes,
    KeyType.Ed25519.value: Ed25519PublicKey.from_bytes,
}

key_type_to_private_key_deserializer = {
    KeyType.Secp256k1.value: Secp256k1PrivateKey.from_bytes,
    KeyType.Ed25519.value: Ed25519PrivateKey.from_bytes,
}


def deserialize_public_key(data: bytes) -> PublicKey:
    f = PublicKey.deserialize_from_protobuf(data)
    try:
        deserializer = key_type_to_public_key_deserializer[f.key_type]
    except KeyError as e:
        raise MissingDeserializerError(
            {"key_type": f.key_type, "key": "public_key"}
        ) from e
    return deserializer(f.data)


def deserialize_private_key(data: bytes) -> PrivateKey:
    f = PrivateKey.deserialize_from_protobuf(data)
    try:
        deserializer = key_type_to_private_key_deserializer[f.key_type]
    except KeyError as e:
        raise MissingDeserializerError(
            {"key_type": f.key_type, "key": "private_key"}
        ) from e
    return deserializer(f.data)