package org.spongycastle.pqc.crypto.test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import junit.framework.TestCase;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.pqc.crypto.ntru.NTRUSigner;
import org.spongycastle.pqc.crypto.ntru.NTRUSigningKeyGenerationParameters;
import org.spongycastle.pqc.crypto.ntru.NTRUSigningKeyPairGenerator;
import org.spongycastle.pqc.crypto.ntru.NTRUSigningPrivateKeyParameters;
import org.spongycastle.pqc.crypto.ntru.NTRUSigningPublicKeyParameters;

public class NTRUSignatureKeyTest
    extends TestCase
{
    public void testEncode()
        throws IOException
    {
        for (NTRUSigningKeyGenerationParameters params : new NTRUSigningKeyGenerationParameters[]{NTRUSigningKeyGenerationParameters.TEST157, NTRUSigningKeyGenerationParameters.TEST157_PROD})
        {
            testEncode(params);
        }
    }

    private void testEncode(NTRUSigningKeyGenerationParameters params)
        throws IOException
    {
        NTRUSigner ntru = new NTRUSigner(params.getSigningParameters());
        NTRUSigningKeyPairGenerator kGen = new NTRUSigningKeyPairGenerator();

        kGen.init(params);

        AsymmetricCipherKeyPair kp = kGen.generateKeyPair();

        NTRUSigningPrivateKeyParameters kPriv = (NTRUSigningPrivateKeyParameters)kp.getPrivate();
        NTRUSigningPublicKeyParameters kPub = (NTRUSigningPublicKeyParameters)kp.getPublic();

        // encode to byte[] and reconstruct
        byte[] priv = kPriv.getEncoded();
        byte[] pub = kPub.getEncoded();
        AsymmetricCipherKeyPair kp2 = new AsymmetricCipherKeyPair(new NTRUSigningPublicKeyParameters(pub, params.getSigningParameters()), new NTRUSigningPrivateKeyParameters(priv, params));
        assertEquals(kPub, kp2.getPublic());
        assertEquals(kPriv, kp2.getPrivate());

        // encode to OutputStream and reconstruct
        ByteArrayOutputStream bos1 = new ByteArrayOutputStream();
        ByteArrayOutputStream bos2 = new ByteArrayOutputStream();
        kPriv.writeTo(bos1);
        kPub.writeTo(bos2);
        ByteArrayInputStream bis1 = new ByteArrayInputStream(bos1.toByteArray());
        ByteArrayInputStream bis2 = new ByteArrayInputStream(bos2.toByteArray());
        AsymmetricCipherKeyPair kp3 = new AsymmetricCipherKeyPair(new NTRUSigningPublicKeyParameters(bis2, params.getSigningParameters()), new NTRUSigningPrivateKeyParameters(bis1, params));
        assertEquals(kPub, kp3.getPublic());
        assertEquals(kPriv, kp3.getPrivate());
    }
}