JAVA AES128加密解密

//摘自網絡，自己修改和封裝了一下，解決網上一些不能在linux下正確加密解密的問題

package cn.rx.util;
import java.security.SecureRandom;
import java.util.Scanner;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
 * 
 * @author xiangxg
 * aes 128加密器
 *
 */

public class AES128 {
	/**
	 * 加密
	 * 
	 * @param content
	 *            需要加密的內容
	 * @return
	 */
	public static String encrypt(String content) {
		
		try {
			Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, genKey());// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return parseByte2HexStr(result); // 加密
		} catch (Exception e) {
			e.printStackTrace();
		} 
		return null;

	}
	/**
	 * 解密
	 * 
	 * @param content
	 *            待解密內容
	 * @return
	 */
	public static String decrypt(String content) {
		
		try {
			byte[] decryptFrom = parseHexStr2Byte(content);
			Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
			cipher.init(Cipher.DECRYPT_MODE, genKey());// 初始化
			byte[] result = cipher.doFinal(decryptFrom);
			return new String(result); // 加密
		} catch (Exception e) {
			e.printStackTrace();
		} 
		return null;
	}
	
	/**
	 * 根據密鑰獲得 SecretKeySpec
	 * @return
	 */
	private  static SecretKeySpec genKey(){

		String strKey = "veir_123";// 加密解密密鑰

		byte[] enCodeFormat = {0}; ;
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"  );   
			secureRandom.setSeed(strKey.getBytes());   
			kgen.init(128, secureRandom);
			SecretKey secretKey = kgen.generateKey();
			enCodeFormat = secretKey.getEncoded();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return new SecretKeySpec(enCodeFormat, "AES");
	}

	

	/**
	 * 將二進制轉換成16進制
	 * 
	 * @param buf
	 * @return
	 */
	private static String parseByte2HexStr(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();
	}

	/**
	 * 將16進制轉換爲二進制
	 * 
	 * @param hexStr
	 * @return
	 */
	private static byte[] parseHexStr2Byte(String hexStr) {
		if (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;
	}
	

	public static void main(String[] args) {
		
		
		Scanner s = new Scanner(System.in);
		System.out.println("Please input the encode content (input 'exit' to exit)!");
		System.out.print("content:");
		
		while(s.hasNext()){
			 String content = s.next();
			if(content.equalsIgnoreCase("exit")){
				System.exit(0);
			}
			System.out.println("Generate password success!");
			System.out.print("password:");
			System.out.println(AES128.encrypt(content)+"\n");
		 
		}
		
	}

}