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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.operator;

import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.bc.BCObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.spec.MLKEMParameterSpec;
import org.bouncycastle.pqc.jcajce.spec.NTRUParameterSpec;
import org.bouncycastle.util.Integers;

/**
 * Look up provider for encapsulation lengths produced be KEM algorithms
 */
public class DefaultKemEncapsulationLengthProvider
    implements KemEncapsulationLengthProvider
{
    private static Map kemEncapsulationLengths = new HashMap();

    static
    {
        kemEncapsulationLengths.put(NISTObjectIdentifiers.id_alg_ml_kem_512, Integers.valueOf(768));
        kemEncapsulationLengths.put(NISTObjectIdentifiers.id_alg_ml_kem_768, Integers.valueOf(1088));
        kemEncapsulationLengths.put(NISTObjectIdentifiers.id_alg_ml_kem_1024, Integers.valueOf(1568));

        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhps2048509, Integers.valueOf(699));
        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhps2048677, Integers.valueOf(930));
        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhps4096821, Integers.valueOf(1230));
        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhps40961229, Integers.valueOf(1842));
        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhrss701, Integers.valueOf(1138));
        kemEncapsulationLengths.put(BCObjectIdentifiers.ntruhrss1373, Integers.valueOf(2401));
    }

    public int getEncapsulationLength(AlgorithmIdentifier kemAlgorithm)
    {
        return ((Integer)kemEncapsulationLengths.get(kemAlgorithm.getAlgorithm())).intValue();
    }
}