package fr.xephi.authme.security.crypts;

import fr.xephi.authme.security.pbkdf2.PBKDF2Engine;
import fr.xephi.authme.security.pbkdf2.PBKDF2Parameters;

import java.security.NoSuchAlgorithmException;

/**
 */
public class CryptPBKDF2 implements EncryptionMethod {

    /**
     * Method getHash.
     *
     * @param password String
     * @param salt     String
     * @param name     String
     * @return String * @throws NoSuchAlgorithmException * @see fr.xephi.authme.security.crypts.EncryptionMethod#getHash(String, String, String)
     */
    @Override
    public String getHash(String password, String salt, String name)
        throws NoSuchAlgorithmException {
        String result = "pbkdf2_sha256$10000$" + salt + "$";
        PBKDF2Parameters params = new PBKDF2Parameters("HmacSHA256", "ASCII", salt.getBytes(), 10000);
        PBKDF2Engine engine = new PBKDF2Engine(params);

        return result + String.valueOf(engine.deriveKey(password, 64));
    }

    /**
     * Method comparePassword.
     *
     * @param hash       String
     * @param password   String
     * @param playerName String
     * @return boolean * @throws NoSuchAlgorithmException * @see fr.xephi.authme.security.crypts.EncryptionMethod#comparePassword(String, String, String)
     */
    @Override
    public boolean comparePassword(String hash, String password,
                                   String playerName) throws NoSuchAlgorithmException {
        String[] line = hash.split("\\$");
        String salt = line[2];
        String derivedKey = line[3];
        PBKDF2Parameters params = new PBKDF2Parameters("HmacSHA256", "ASCII", salt.getBytes(), 10000, derivedKey.getBytes());
        PBKDF2Engine engine = new PBKDF2Engine(params);
        return engine.verifyKey(password);
    }

}