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/*
 * Copyright (c) 2013-2024 Hutool Team and hutool.cn
 *
 * 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 org.dromara.hutool.crypto;

import org.dromara.hutool.core.lang.Assert;
import org.dromara.hutool.core.lang.wrapper.SimpleWrapper;

import javax.crypto.ShortBufferException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

/**
 * 提供{@link javax.crypto.Cipher}的方法包装
 *
 * @author Looly
 */
public class JceCipher extends SimpleWrapper implements Cipher {

	/**
	 * 构造
	 *
	 * @param algorithm 算法名称
	 */
	public JceCipher(final String algorithm) {
		this(SecureUtil.createCipher(algorithm));
	}

	/**
	 * 构造
	 *
	 * @param cipher {@link javax.crypto.Cipher},可以通过{@link javax.crypto.Cipher#getInstance(String)}创建
	 */
	public JceCipher(final javax.crypto.Cipher cipher) {
		super(Assert.notNull(cipher));
	}

	@Override
	public String getAlgorithmName() {
		return this.raw.getAlgorithm();
	}

	@Override
	public int getBlockSize() {
		return this.raw.getBlockSize();
	}

	@Override
	public int getOutputSize(final int len) {
		return this.raw.getOutputSize(len);
	}

	/**
	 * 返回新缓冲区中的初始化向量(IV)
* 这在创建随机IV的情况下,或在基于密码的加密或解密的上下文中是有用的,其中IV是从用户提供的密码导出的。 * * @return 新缓冲区中的初始化向量,如果基础算法不使用IV,或者尚未设置IV,则为null。 */ public byte[] getIV() { return this.raw.getIV(); } @Override public void init(final CipherMode mode, final Parameters parameters) { Assert.isInstanceOf(JceParameters.class, parameters, "Only support JceParameters!"); try { init(mode.getValue(), (JceParameters) parameters); } catch (final InvalidAlgorithmParameterException | InvalidKeyException e) { throw new CryptoException(e); } } /** * 执行初始化参数操作 * * @param mode 模式 * @param jceParameters {@link JceParameters} * @throws InvalidAlgorithmParameterException 无效算法参数 * @throws InvalidKeyException 无效key */ public void init(final int mode, final JceParameters jceParameters) throws InvalidAlgorithmParameterException, InvalidKeyException { final javax.crypto.Cipher cipher = this.raw; if (null != jceParameters.parameterSpec) { if (null != jceParameters.random) { cipher.init(mode, jceParameters.key, jceParameters.parameterSpec, jceParameters.random); } else { cipher.init(mode, jceParameters.key, jceParameters.parameterSpec); } } else { if (null != jceParameters.random) { cipher.init(mode, jceParameters.key, jceParameters.random); } else { cipher.init(mode, jceParameters.key); } } } // region ----- process /** * 继续多部分加密或解密操作(取决于此密码的初始化方式),处理另一个数据部分。 * 第一inputLen字节在input缓冲区中,从inputOffset以下,被处理,并且结果被存储在output缓冲器。 * * @param in 输入缓冲区 * @param inOff 输入开始的 input中的偏移量 * @param len 输入长度 * @return 带有结果的新缓冲区,如果底层密码是块密码且输入数据太短而不能产生新块,则返回null。 */ public byte[] process(final byte[] in, final int inOff, final int len) { return this.raw.update(in, inOff, len); } /** * 继续多部分加密或解密操作(取决于此密码的初始化方式),处理另一个数据部分。 * 第一inputLen字节在input缓冲区中,从inputOffset以下,被处理,并且结果被存储在output缓冲器。 * * @param in 输入缓冲区 * @param inOff 输入开始的 input中的偏移量 * @param len 输入长度 * @param out 结果的缓冲区 * @return 存储在 output的字节数 */ public int process(final byte[] in, final int inOff, final int len, final byte[] out) { try { return this.raw.update(in, inOff, len, out); } catch (final ShortBufferException e) { throw new CryptoException(e); } } @Override public int process(final byte[] in, final int inOff, final int len, final byte[] out, final int outOff) { try { return this.raw.update(in, inOff, len, out, outOff); } catch (final ShortBufferException e) { throw new CryptoException(e); } } // endregion @Override public int doFinal(final byte[] out, final int outOff) { try { return this.raw.doFinal(out, outOff); } catch (final Exception e) { throw new CryptoException(e); } } @Override public byte[] processFinal(final byte[] in) { try { return this.raw.doFinal(in); } catch (final Exception e) { throw new CryptoException(e); } } @Override public byte[] processFinal(final byte[] data, final int inOffset, final int inputLen) { try { return this.raw.doFinal(data, inOffset, inputLen); } catch (final Exception e) { throw new CryptoException(e); } } /** * JCE的{@link AlgorithmParameterSpec} 参数包装 */ public static class JceParameters implements Parameters { private final Key key; /** * 算法参数 */ private final AlgorithmParameterSpec parameterSpec; /** * 随机数生成器,可自定义随机数种子 */ private final SecureRandom random; /** * 构造 * * @param key 密钥 * @param parameterSpec {@link AlgorithmParameterSpec} * @param random 自定义随机数生成器 */ public JceParameters(final Key key, final AlgorithmParameterSpec parameterSpec, final SecureRandom random) { this.key = key; this.parameterSpec = parameterSpec; this.random = random; } } }




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