<PackageReference Include="BouncyCastle.Cryptography" Version="2.6.2" />

Org.BouncyCastle.Crypto.Macs.GMac

public class GMac : IMac
The GMAC specialisation of Galois/Counter mode (GCM) detailed in NIST Special Publication 800-38D.
namespace Org.BouncyCastle.Crypto.Macs { public class GMac : IMac { public string AlgorithmName { get; } public GMac(GcmBlockCipher cipher); public GMac(GcmBlockCipher cipher, int macSizeBits); public void Init(ICipherParameters parameters); public int GetMacSize(); public void Update(byte input); public void BlockUpdate(byte[] input, int inOff, int len); public int DoFinal(byte[] output, int outOff); public void Reset(); } }