<PackageReference Include="BouncyCastle.Cryptography" Version="2.3.0" />

ISignerWithRecovery

public interface ISignerWithRecovery : ISigner
namespace Org.BouncyCastle.Crypto { public interface ISignerWithRecovery : ISigner { bool HasFullMessage(); byte[] GetRecoveredMessage(); void UpdateWithRecoveredMessage(byte[] signature); } }