org.bouncycastle.pqc.crypto.frodo.FrodoKEMExtractor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-jdk15to18 Show documentation

The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

There is a newer version: 1.79

Show newest version

package org.bouncycastle.pqc.crypto.frodo;

import org.bouncycastle.crypto.EncapsulatedSecretExtractor;

public class FrodoKEMExtractor
        implements EncapsulatedSecretExtractor
{
    private FrodoEngine engine;

    private FrodoKeyParameters key;

    public FrodoKEMExtractor(FrodoKeyParameters privParams)
    {
        this.key = privParams;
        initCipher(key.getParameters());
    }

    private void initCipher(FrodoParameters param)
    {
        engine = param.getEngine();
    }

    @Override
    public byte[] extractSecret(byte[] encapsulation)
    {
        byte[] session_key = new byte[engine.getSessionKeySize()];
        engine.kem_dec(session_key, encapsulation, ((FrodoPrivateKeyParameters)key).getPrivateKey());
        return session_key;
    }

    public int getInputSize()
    {
        return engine.getCipherTextSize();
    }
}