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/*
 * Copyright 2018-2025 the original author or authors.
 *
 * 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 com.github.flysium.io.yew.common.crypto.impl;

import com.github.flysium.io.yew.common.crypto.AbstractSymmetric;
import com.github.flysium.io.yew.common.crypto.CryptoSpi;
import com.github.flysium.io.yew.common.crypto.SecretSpi;
import java.security.Provider;
import javax.crypto.spec.SecretKeySpec;


/**
 * AES
 *
 * @author Sven  MMMM
 * @version 1.0
 * @since JDK 1.7
 */
public class AES extends AbstractSymmetric implements CryptoSpi, SecretSpi {

	/**
	 * Advanced Encryption Standard as specified by NIST in FIPS 197.  Also known as the Rijndael
	 * algorithm by Joan Daemen and Vincent Rijmen,  AES is a 128-bit block cipher supporting
	 * keys of 128, 192, and 256 bits.
	 */
	private static final String DEFAULT_ALGORITHM = "AES";
	/**
	 * default transforms
	 */
	private static final String DEFAULT_TRANSFORMS = "AES";
	/**
	 * default key length，256 bits
	 */
	public static final int DEFAULT_KEY_SIZE = 256;
	private static final int ALLOW_KEY_SIZE_128 = 128;
	private static final int ALLOW_KEY_SIZE_192 = 192;
	private static final int ALLOW_KEY_SIZE_256 = 256;

	public AES() {
		this(null, DEFAULT_TRANSFORMS);
	}

	public AES(Provider provider) {
		this(provider, DEFAULT_TRANSFORMS);
	}

	public AES(String transforms) {
		this(null, transforms);
	}

	public AES(Provider provider, String transforms) {
		super(DEFAULT_ALGORITHM, provider, transforms);
	}

	@Override
	public void setSecret(byte[] secretKey) {
		if (secretKey == null) {
			return;
		}
		// 使用SecretKeySpec构建
		this.secretKey = new SecretKeySpec(secretKey, algorithm);
	}

	/**
	 * Generate a random key
	 */
	@Override
	public void generateKey() {
		generateKey(DEFAULT_KEY_SIZE);
	}

	@Override
	public void generateKey(int keyLength) {
		if (keyLength != ALLOW_KEY_SIZE_128 && keyLength != ALLOW_KEY_SIZE_192
				&& keyLength != ALLOW_KEY_SIZE_256) {
			throw new IllegalStateException("Invalid key size (" + keyLength + " bits)");
		}
		super.generateKey(keyLength);
	}

}