<PackageReference Include="BouncyCastle.Cryptography" Version="2.7.0" />

Org.BouncyCastle.Bcpg.Sig.SignatureExpirationTime

Signature Subpacket containing the number of seconds after the signatures creation time after which the signature expires.
namespace Org.BouncyCastle.Bcpg.Sig { public class SignatureExpirationTime : SignatureSubpacket { public long Time { get; } protected static byte[] TimeToBytes(long t); public SignatureExpirationTime(bool critical, bool isLongLength, byte[] data); public SignatureExpirationTime(bool critical, long seconds); } }