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/*
 * Copyright 2019 Kut3Net.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.kut3.cryto;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;

/**
 *
 */
public final class HMAC implements Signature {

    private final String algorithm;
    private final Key key;

    /**
     *
     * @param algorithm The HMAC algorithm name
     * @param key Key
     */
    public HMAC(String algorithm, Key key) {
        this.algorithm = algorithm;
        this.key = key;
    }

    @Override
    public byte[] generate(byte[] data) {
        try {
            Mac mac = Mac.getInstance(this.algorithm);
            mac.init(this.key);
            return mac.doFinal(data);
        } catch (NoSuchAlgorithmException | InvalidKeyException ex) {
            return null;
        }
    }

    @Override
    public boolean verify(byte[] data, byte[] signature) {
        return MessageDigest.isEqual(signature, this.generate(data));
    }
}