using Org.BouncyCastle.Crypto; namespace Org.BouncyCastle.Pqc.Crypto.Saber { public sealed class SaberKemExtractor : IEncapsulatedSecretExtractor { private readonly SaberKeyParameters key; private SaberEngine engine; public int EncapsulationLength => engine.GetCipherTextSize(); public SaberKemExtractor(SaberKeyParameters privParams) { key = privParams; InitCipher(key.Parameters); } private void InitCipher(SaberParameters param) { engine = param.Engine; } public byte[] ExtractSecret(byte[] encapsulation) { byte[] array = new byte[engine.GetSessionKeySize()]; engine.crypto_kem_dec(array, encapsulation, ((SaberPrivateKeyParameters)key).GetPrivateKey()); return array; } } }