/// <summary>
/// Verifies if signature of provided header was created using
/// private key that corresponds to given public key.
/// </summary>
public bool VerifySignature(PubKey pubKey, PoABlockHeader header)
{
if ((header.BlockSignature == null) || header.BlockSignature.IsEmpty())
{
this.logger.LogTrace("(-)[NO_SIGNATURE]");
return(false);
}
if (!ECDSASignature.IsValidDER(header.BlockSignature.Signature))
{
this.logger.LogTrace("(-)[INVALID_DER]");
return(false);
}
ECDSASignature signature = ECDSASignature.FromDER(header.BlockSignature.Signature);
if (!signature.IsLowS)
{
this.logger.LogTrace("(-)[NOT_CANONICAL]");
return(false);
}
uint256 headerHash = header.GetHash();
bool isValidSignature = pubKey.Verify(headerHash, signature);
return(isValidSignature);
}
/// <summary>Signs PoA header with the specified key.</summary>
public void Sign(Key key, PoABlockHeader header)
{
uint256 headerHash = header.GetHash();
ECDSASignature signature = key.Sign(headerHash);
header.BlockSignature = new BlockSignature {
Signature = signature.ToDER()
};
}