using Org.BouncyCastle.Crypto; namespace Org.BouncyCastle.Pqc.Crypto.Crystals.Kyber { public sealed class KyberKemExtractor : IEncapsulatedSecretExtractor { private readonly KyberKeyParameters m_key; private readonly KyberEngine m_engine; public int EncapsulationLength => m_engine.CryptoCipherTextBytes; public KyberKemExtractor(KyberKeyParameters privParams) { m_key = privParams; m_engine = m_key.Parameters.Engine; } public byte[] ExtractSecret(byte[] encapsulation) { byte[] array = new byte[m_engine.CryptoBytes]; m_engine.KemDecrypt(array, encapsulation, ((KyberPrivateKeyParameters)m_key).GetEncoded()); return array; } } }