package dslab.crypto;

import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 *  domain object for the message rsa_encrypt(ok <client-challenge> <secret-key> <iv>)
 */
public class ClientChallengeMessage {
    private final byte[] challenge;
    private final SecretKeySpec key;
    private final IvParameterSpec initializationVector;

    public ClientChallengeMessage(byte[] challenge, SecretKeySpec key, IvParameterSpec iv) {

        //Assignment: "In our implementation, challenges are 32 byte"
        var challengeLength = challenge.length;
        if (challengeLength != 32)
            throw new IllegalArgumentException("Challenge should be 32 byte, was " + challengeLength);
        this.challenge = challenge;

        //Assignment: "AES initialization vectors are 16 byte random numbers"
        var ivLength = iv.getIV().length;
        if (ivLength != 16)
            throw new IllegalArgumentException("Initialization vector should be 16 bytes, was " + ivLength);
        this.initializationVector = iv;

        this.key = key;
    }

    public byte[] getChallenge() {
        return challenge;
    }

    public SecretKeySpec getKey() {
        return key;
    }

    public IvParameterSpec getInitializationVector() {
        return initializationVector;
    }



}