對稱加密

package net.foreworld.util;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.apache.commons.codec.binary.Base64;

/**
 *
 * @author huangxin <3203317@qq.com>
 *
 */
public class PBECoder {

	public static final String ALGORITHM = "PBEWITHMD5andDES";
	public static final int SALT_COUNT = 100;

	public static SecureRandom random;

	static {
		random = new SecureRandom();
	}

	public static void main(String[] args) throws Exception {
		String message = "123456 hello 世界！";

		PBEParameterSpec pbe = genPBEParameterSpec(genSalt("12345678"));

		String edata = encrypt("password", pbe, message);
		System.out.println("pbe encrypt: " + edata);

		String ddata = decrypt("password", pbe, edata);
		System.err.println("pbe decrypt: " + ddata);

		System.err.println("pbe compare: " + message.equals(ddata));
	}

	/**
	 *
	 * @param pwd
	 * @return
	 * @throws Exception
	 */
	public static Key genKey(String pwd) throws Exception {
		PBEKeySpec pbeKeySpec = new PBEKeySpec(pwd.toCharArray());
		SecretKeyFactory factory = SecretKeyFactory.getInstance(ALGORITHM);
		return factory.generateSecret(pbeKeySpec);
	}

	/**
	 *
	 * @param need
	 * @return
	 */
	public static byte[] genSalt(String need) {
		return need.getBytes();
	}

	/**
	 *
	 * @return
	 */
	public static byte[] genSalt() {
		return random.generateSeed(8);
	}

	/**
	 *
	 * @param salt
	 * @return
	 */
	public static PBEParameterSpec genPBEParameterSpec(byte[] salt) {
		return new PBEParameterSpec(salt, SALT_COUNT);
	}

	/**
	 * 加密
	 *
	 * @param pwd
	 * @param pbe
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public static String encrypt(String pwd, PBEParameterSpec pbe, String data)
			throws Exception {
		Key key = genKey(pwd);

		Cipher cipher = Cipher.getInstance(ALGORITHM);
		cipher.init(Cipher.ENCRYPT_MODE, key, pbe);

		byte[] result = cipher.doFinal(data.getBytes());

		return Base64.encodeBase64String(result);
	}

	/**
	 * 解密
	 *
	 * @param pwd
	 * @param pbe
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public static String decrypt(String pwd, PBEParameterSpec pbe, String data)
			throws Exception {
		Key key = genKey(pwd);

		Cipher cipher = Cipher.getInstance(ALGORITHM);
		cipher.init(Cipher.DECRYPT_MODE, key, pbe);

		byte[] result = cipher.doFinal(Base64.decodeBase64(data));

		return new String(result);
	}

}

pbe encrypt: LvKXdcVMaEsu1Hfr/0gii2xTZO5PLOvX
pbe decrypt: 123456 hello 世界！
pbe compare: true