/// <summary>
/// Verifies if the public key recovered from the <see cref="Signature"/> of this record matches
/// the one that is included in the <value>Secp256k1</value> entry.
/// If the <value>Secp256k1</value> entry is missing then <value>false</value> is returned.
/// </summary>
/// <param name="nodeRecord">A <see cref="NodeRecord"/> for which to verify the signature.</param>
/// <returns><value>True</value> if signature has a matching public key, otherwise <value>false</value></returns>
/// <exception cref="Exception">Thrown when <see cref="Signature"/> is <value>null</value></exception>
public bool Verify(NodeRecord nodeRecord)
{
if (nodeRecord.Signature is null)
{
throw new Exception("Cannot verify an ENR with an empty signature.");
}
Keccak contentHash;
if (nodeRecord.OriginalContentRlp is not null)
{
contentHash = Keccak.Compute(nodeRecord.OriginalContentRlp);
}
else
{
contentHash = nodeRecord.ContentHash;
}
CompressedPublicKey publicKeyA =
_ecdsa.RecoverCompressedPublicKey(nodeRecord.Signature !, contentHash);
Signature sigB = new (nodeRecord.Signature !.Bytes, 1);
CompressedPublicKey publicKeyB =
_ecdsa.RecoverCompressedPublicKey(sigB, contentHash);
CompressedPublicKey?reportedKey =
nodeRecord.GetObj <CompressedPublicKey>(EnrContentKey.Secp256K1);
return(publicKeyA.Equals(reportedKey) || publicKeyB.Equals(reportedKey));
}
public void Decompress()
{
EthereumEcdsa ethereumEcdsa = new(ChainId.Olympic, LimboLogs.Instance);
PrivateKey privateKey = Build.A.PrivateKey.TestObject;
CompressedPublicKey compressedPublicKey = privateKey.CompressedPublicKey;
PublicKey expected = privateKey.PublicKey;
PublicKey actual = ethereumEcdsa.Decompress(compressedPublicKey);
Assert.AreEqual(expected, actual);
}
public PublicKey Decompress(CompressedPublicKey compressedPublicKey)
{
byte[] deserialized = Proxy.Decompress(compressedPublicKey.Bytes);
return(new PublicKey(deserialized));
}
