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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;

import com.github.flysium.io.yew.common.crypto.support.CryptoUtil;
import java.io.UnsupportedEncodingException;
import java.security.Provider;
import javax.crypto.Cipher;

/**
 * Encryption and decryption SPI (reversible SPI)
 *
 * @author Sven Augustus
 * @version 1.0
 * @since JDK 1.7
 */
abstract class AbstractCryptoSpi extends AbstractSecretSpi implements CryptoSpi {

	/**
	 * 转换的名称，“算法名/算法模式/填充模式”（Cipher Algorithm Names/Modes/Padding），例如 AES/ECB/PKCS5Padding。
	 * 有关标准转换名称的信息，请参见 Java Cryptography Architecture Reference Guide 的附录A：
	 * https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Cipher
	 */
	protected final String transforms;
	private final Cipher cipher;

	protected Cipher getCipher() {
		return cipher;
	}

	public AbstractCryptoSpi(String algorithm, Provider provider, String transforms) {
		super(algorithm, provider);
		this.transforms = transforms;
		this.cipher = CryptoUtil
				.getCipher(AbstractCryptoSpi.this.transforms, AbstractCryptoSpi.this.provider);
	}

	@Override
	public String getTransforms() {
		return transforms;
	}

	@Override
	public String decryptString(String cipherText, String charsetName) {
		try {
			byte[] decryptedData = decrypt(cipherText.getBytes(charsetName));
			return new String(decryptedData, charsetName);
		} catch (UnsupportedEncodingException e) {
			fail(e);
		}
		return null;
	}

	@Override
	public String decryptStringB64(String cipherTextB64, String charsetName) {
		try {
			byte[] decryptedData = decrypt(CryptoUtil.unarmor(cipherTextB64, charsetName));
			return new String(decryptedData, charsetName);
		} catch (UnsupportedEncodingException e) {
			fail(e);
		}
		return null;
	}

	@Override
	public String decryptStringHex(String cipherTextHex, String charsetName) {
		try {
			byte[] decryptedData = decrypt(CryptoUtil.unhex(cipherTextHex));
			return new String(decryptedData, charsetName);
		} catch (UnsupportedEncodingException e) {
			fail(e);
		}
		return null;
	}

}