Java crypto DES AES加解密

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * 目前僅支持DES和AES
 */
public class CryptUtil {

	public static final String type_DES = "DES";
	public static final String type_AES = "AES";
	public static final String code_utf8 = "utf-8";

	private String type;
	private String code;

	public CryptUtil(String type, String code) {
		this.type = type;
		this.code = code;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code;
	}

	public static String byteToHexStr(byte buf[]) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	public static byte[] hexStrToByte(String hexStr) {
		if (hexStr == null || hexStr.length() < 1) {
			return null;
		}
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++) {
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = (byte) (high * 16 + low);
		}
		return result;
	}

	private Key createKey(String key) throws Exception {
		if (type_DES.equals(type)) {
			DESKeySpec dks = new DESKeySpec(key.getBytes(code));
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(type);
			SecretKey securekey = keyFactory.generateSecret(dks);
			return securekey;
		} else if (type_AES.equals(type)) {
			KeyGenerator keyGen = KeyGenerator.getInstance(type);
			keyGen.init(128, new SecureRandom(key.getBytes(code)));
			SecretKey secretKey = keyGen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec keySpec = new SecretKeySpec(enCodeFormat, type);
			return keySpec;
		}
		return null;
	}

	private Cipher createEncryptCipher(String key) throws Exception {
		Cipher cipher = Cipher.getInstance(type);
		cipher.init(Cipher.ENCRYPT_MODE, createKey(key), new SecureRandom());
		return cipher;
	}

	public byte[] encrypt(byte[] data, String key) throws Exception {
		Cipher cipher = createEncryptCipher(key);
		return cipher.doFinal(data);
	}

	public void encryptFileToFile(File src, File des, String key) throws Exception {
		Cipher cipher = createEncryptCipher(key);
		try (FileInputStream in = new FileInputStream(src); FileOutputStream out = new FileOutputStream(des); CipherInputStream cipIn = new CipherInputStream(in, cipher)) {
			byte[] buffer = new byte[1024];
			for (int len = cipIn.read(buffer); len > 0; len = cipIn.read(buffer)) {
				out.write(buffer, 0, len);
				out.flush();
			}
		} catch (Exception e) {
			throw e;
		}
	}

	public byte[] encryptStr(String data, String key) throws Exception {
		Cipher cipher = createEncryptCipher(key);
		return cipher.doFinal(data.getBytes(code));
	}

	public String encryptStrToHexStr(String data, String key) throws Exception {
		byte[] encryptStr = encryptStr(data, key);
		return CryptUtil.byteToHexStr(encryptStr);
	}

	private Cipher createDecryptCipher(String key) throws Exception {
		Cipher cipher = Cipher.getInstance(type);
		cipher.init(Cipher.DECRYPT_MODE, createKey(key), new SecureRandom());
		return cipher;
	}

	public byte[] decrypt(byte[] data, String key) throws Exception {
		Cipher cipher = createDecryptCipher(key);
		return cipher.doFinal(data);
	}

	public void decryptFileToFile(File src, File des, String key) throws Exception {
		Cipher cipher = createDecryptCipher(key);
		try (FileInputStream in = new FileInputStream(src); FileOutputStream out = new FileOutputStream(des); CipherOutputStream cipOut = new CipherOutputStream(out, cipher)) {
			byte[] buffer = new byte[4096];//解密時數組長度與加密時長度沒關聯和影響
			for (int len = in.read(buffer); len > 0; len = in.read(buffer)) {
				cipOut.write(buffer, 0, len);
			}
		} catch (Exception e) {
			throw e;
		}
	}

	public String decryptToStr(byte[] data, String key) throws Exception {
		Cipher cipher = createDecryptCipher(key);
		byte[] result = cipher.doFinal(data);
		return new String(result, code);
	}

	public String decryptHexStrToStr(String data, String key) throws Exception {
		byte[] decryptFrom = CryptUtil.hexStrToByte(data);
		return decryptToStr(decryptFrom, key);
	}
	
	public static void main(String[] args) throws Exception {
		desTest(args);
		aesTest(args);
		aesFileTest(args);
	}
	
	public static void desTest(String[] args) throws Exception {
		
		CryptUtil cryptUtil=new CryptUtil(CryptUtil.type_DES, CryptUtil.code_utf8);
		
		String data = "abcefghijklmnopqrstuvwxyz中國*_-+=()0123456789";
		String key = "祕鑰是0001111";
		long time = System.currentTimeMillis();
		System.out.println("加密前：" + data);
		byte[] encrypt = cryptUtil.encryptStr(data, key);
		System.out.println("加密用時：" + (System.currentTimeMillis() - time));
		time = System.currentTimeMillis();
		String decrypt = cryptUtil.decryptToStr(encrypt, key);
		System.out.println("解密用時：" + (System.currentTimeMillis() - time));
		System.out.println("解密後：" + decrypt);
	}

	public static void aesTest(String[] args) throws Exception {

		CryptUtil cryptUtil = new CryptUtil(CryptUtil.type_AES, CryptUtil.code_utf8);

		String data = "abcefghijklmnopqrstuvwxyz中國*_-+=()0123456789";
		String key = "祕鑰是0001111";
		long time = System.currentTimeMillis();
		System.out.println("加密前：" + data);
		byte[] encrypt = cryptUtil.encryptStr(data, key);
		System.out.println("加密用時：" + (System.currentTimeMillis() - time));
		time = System.currentTimeMillis();
		String decrypt = cryptUtil.decryptToStr(encrypt, key);
		System.out.println("解密用時：" + (System.currentTimeMillis() - time));
		System.out.println("解密後：" + decrypt);
	}

	public static void aesFileTest(String[] args) throws Exception {
		CryptUtil cryptUtil = new CryptUtil(CryptUtil.type_AES, CryptUtil.code_utf8);
		String key = "祕鑰是0001111";
		long time = System.currentTimeMillis();
		cryptUtil.encryptFileToFile(new File("D:\\開發資料\\zwyl.zip"), new File("C:\\Users\\tangzhichao\\Desktop\\加密.zip"), key);
		System.out.println("加密用時：" + (System.currentTimeMillis() - time));
		time = System.currentTimeMillis();
		cryptUtil.decryptFileToFile(new File("C:\\Users\\tangzhichao\\Desktop\\加密.zip"), new File("C:\\Users\\tangzhichao\\Desktop\\解密.zip"), key);
		System.out.println("解密用時：" + (System.currentTimeMillis() - time));

	}
}