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package org.openjdk.bench.javax.crypto.full;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.OperationsPerInvocation;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.infra.Blackhole;

import javax.crypto.DecapsulateException;
import javax.crypto.KEM;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

public class KEMBench extends CryptoBase {

    public static final int SET_SIZE = 128;

    @Param({"ML-KEM-512", "ML-KEM-768", "ML-KEM-1024" })
    private String algorithm;

    private KeyPair[] keys;
    private byte[][] messages;

    private KEM kem;

    @Setup
    public void setup() throws NoSuchAlgorithmException, InvalidKeyException {
        kem = (prov == null) ? KEM.getInstance(algorithm) : KEM.getInstance(algorithm, prov);
        KeyPairGenerator generator = (prov == null) ? KeyPairGenerator.getInstance(algorithm) : KeyPairGenerator.getInstance(algorithm, prov);
        keys = new KeyPair[SET_SIZE];
        for (int i = 0; i < keys.length; i++) {
            keys[i] = generator.generateKeyPair();
        }
        messages = new byte[SET_SIZE][];
        for (int i = 0; i < messages.length; i++) {
            KEM.Encapsulator enc = kem.newEncapsulator(keys[i].getPublic());
            KEM.Encapsulated encap = enc.encapsulate();
            messages[i] = encap.encapsulation();
        }
    }

    @Benchmark
    @OperationsPerInvocation(SET_SIZE)
    public void encapsulate(Blackhole bh) throws InvalidKeyException {
        for (KeyPair kp : keys) {
            bh.consume(kem.newEncapsulator(kp.getPublic()).encapsulate().encapsulation());
        }
    }

    @Benchmark
    @OperationsPerInvocation(SET_SIZE)
    public void decapsulate(Blackhole bh) throws InvalidKeyException, DecapsulateException {
        for (int i = 0; i < messages.length; i++) {
            bh.consume(kem.newDecapsulator(keys[i].getPrivate()).decapsulate(messages[i]));
        }
    }

}