com.xiaoleilu.hutool.crypto.symmetric.SymmetricCriptor Maven / Gradle / Ivy

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package com.xiaoleilu.hutool.crypto.symmetric;

import java.io.IOException;
import java.io.InputStream;
import java.security.spec.AlgorithmParameterSpec;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.PBEParameterSpec;

import com.xiaoleilu.hutool.crypto.CryptoException;
import com.xiaoleilu.hutool.crypto.SecureUtil;
import com.xiaoleilu.hutool.io.IoUtil;
import com.xiaoleilu.hutool.util.CharsetUtil;
import com.xiaoleilu.hutool.util.RandomUtil;
import com.xiaoleilu.hutool.util.StrUtil;

/**
 * 对称加密算法

 * @author Looly
 *
 */
public class SymmetricCriptor {

	/** SecretKey 负责保存对称密钥 */
	private SecretKey secretKey;
	/** Cipher负责完成加密或解密工作 */
	private Cipher clipher;
	/** 加密解密参数 */
	private AlgorithmParameterSpec params;
	private Lock lock = new ReentrantLock();

	//------------------------------------------------------------------ Constructor start
	/**
	 * 构造
	 * @param algorithm {@link SymmetricAlgorithm}
	 */
	public SymmetricCriptor(SymmetricAlgorithm algorithm) {
		this(algorithm, null);
	}
	
	/**
	 * 构造
	 * @param algorithm 算法
	 */
	public SymmetricCriptor(String algorithm) {
		this(algorithm, null);
	}
	
	/**
	 * 构造
	 * @param algorithm {@link SymmetricAlgorithm}
	 * @param key 自定义KEY
	 */
	public SymmetricCriptor(SymmetricAlgorithm algorithm, byte[] key) {
		this(algorithm.getValue(), key);
	}
	
	public SymmetricCriptor(String algorithm, byte[] key) {
		init(algorithm, key);
	}
	//------------------------------------------------------------------ Constructor end
	
	/**
	 * 初始化
	 * @param algorithm 算法
	 * @param key 密钥，如果为null自动生成一个key
	 * @return {@link SymmetricCriptor}
	 */
	public SymmetricCriptor init(String algorithm, byte[] key) {
		this.secretKey = SecureUtil.generateKey(algorithm, key);
		if(algorithm.startsWith("PBE")){
			//对于PBE算法使用随机数加盐
			this.params = new PBEParameterSpec(RandomUtil.randomBytes(8), 100);
		}
		try {
			clipher = Cipher.getInstance(algorithm);
		} catch (Exception e) {
			throw new CryptoException(e);
		}
		return this;
	}
	
	//--------------------------------------------------------------------------------- Encrypt
	/**
	 * 加密
	 * @param data 被加密的bytes
	 * @return 加密后的bytes
	 */
	public byte[] encrypt(byte[] data){
		lock.lock();
		try {
			if(null == this.params){
				clipher.init(Cipher.ENCRYPT_MODE, secretKey);
			}else{
				clipher.init(Cipher.ENCRYPT_MODE, secretKey, params);
			}
			return clipher.doFinal(data);
		} catch (Exception e) {
			throw new CryptoException(e);
		}finally{
			lock.unlock();
		}
	}
	
	/**
	 * 加密
	 * @param data 被加密的字符串
	 * @param charset 编码
	 * @return 加密后的bytes
	 */
	public byte[] encrypt(String data, String charset){
		return encrypt(StrUtil.bytes(data, charset));
	}
	
	/**
	 * 加密，使用UTF-8编码
	 * @param data 被加密的字符串
	 * @return 加密后的bytes
	 */
	public byte[] encrypt(String data){
		return encrypt(StrUtil.bytes(data, CharsetUtil.CHARSET_UTF_8));
	}
	
	/**
	 * 加密
	 * @param data 被加密的字符串
	 * @return 加密后的bytes
	 */
	public byte[] encrypt(InputStream data){
		try {
			return encrypt(IoUtil.readBytes(data));
		} catch (IOException e) {
			throw new CryptoException(e);
		}
	}
	
	//--------------------------------------------------------------------------------- Decrypt
	/**
	 * 解密
	 * @param bytes 被解密的bytes
	 * @return 解密后的bytes
	 */
	public byte[] decrypt(byte[] bytes){
		lock.lock();
		try {
			if(null == this.params){
				clipher.init(Cipher.DECRYPT_MODE, secretKey);
			}else{
				clipher.init(Cipher.DECRYPT_MODE, secretKey, params);
			}
			return clipher.doFinal(bytes);
		} catch (Exception e) {
			throw new CryptoException(e);
		}finally{
			lock.unlock();
		}
	}
	
	/**
	 * 解密
	 * @param data 被解密的bytes
	 * @return 解密后的bytes
	 */
	public byte[] decrypt(InputStream data){
		try {
			return decrypt(IoUtil.readBytes(data));
		} catch (IOException e) {
			throw new CryptoException(e);
		}
	}
	
	//--------------------------------------------------------------------------------- Getters
	/**
	 * 获得对称密钥
	 * @return 获得对称密钥
	 */
	public SecretKey getSecretKey() {
		return secretKey;
	}

	/**
	 * 获得加密或解密器
	 * @return 加密或解密
	 */
	public Cipher getClipher() {
		return clipher;
	}
}