AES加密解密简单实例

package cn.com.util;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;/** * 加密压缩文件，解密压缩文件工具类 * @author max * */public class AESlockUtil {/** * 文件读取缓冲区大小  */private static final int CACHE_SIZE = 1024;public static void main(String[] args) throws Exception {jiami();jiemi();}/** * 加密 * @param content 需要加密的内容 * @param password  加密密码 * @return */ public static byte[] encrypt(byte[] content, String password) { try {    //long startTime=System.currentTimeMillis();KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); Cipher cipher = Cipher.getInstance("AES");// 创建密码器 cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 byte[] result = cipher.doFinal(content); //long endTime=System.currentTimeMillis();//System.out.println("加密时间： "+(endTime-startTime)+"ms");return result; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; } /**解密 * @param content  待解密内容 * @param password 解密密钥 * @return */ public static byte[] decrypt(byte[] content, String password) { try { //long startTime=System.currentTimeMillis();KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, new SecureRandom(password.getBytes())); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");             Cipher cipher = Cipher.getInstance("AES");// 创建密码器 cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 byte[] result = cipher.doFinal(content); //long endTime=System.currentTimeMillis();// System.out.println("解密时间： "+(endTime-startTime)+"ms");return result; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; }/** * 加密测试方法 * 加密后的文件放在源文件同一目录下 */public static void jiami() throws Exception{//压缩包文件转bytebyte[] zipByte = fileToByte("D:/aaa/4028cb2450fa422a0150ff63da6b004f.rar");//加密String password = "123qwe!@#";//加密密码//加密后的byte数组byte[] encryptResult = encrypt(zipByte, password);//如果加密成功形成了加密后的数组，就删除原有的压缩文件if(encryptResult.length!=0){//压缩包文件路径File folder = new File("D:/aaa");File[] files =folder.listFiles();//遍历整个文件夹for(File file:files){ //如果是加密之前的文件就删除if(file.getName().equals("4028cb2450fa422a0150ff63da6b004f.rar")){file.delete();}}}//读取加密后的文件ByteArrayInputStream arrin =new ByteArrayInputStream(encryptResult);//文件输出流FileOutputStream out = new FileOutputStream("D:/aaa/4028cb2450fa422a0150ff63da6b004f.rar");byte[] bytes = new byte[1024];int len = 0;while((len=arrin.read(bytes))!=-1){//写入加密后的内容out.write(bytes,0,len);}out.close();arrin.close();}/** * 解密测试方法 * 解密后的文件存放在解密前统一路径下 */public static void jiemi() throws Exception{//文件转byte数组byte[] content = fileToByte("D:/aaa/4028cb2450fa422a0150ff63da6b004f.rar");//解密密码String password = "123qwe!@#";//解密后的byte数组byte[] decryptResult = decrypt(content,password); //如果解密成功形成了解密后的数组，就删除原有的压缩文件if(decryptResult.length!=0){//压缩包文件路径File folder = new File("D:/aaa");File[] files =folder.listFiles();//遍历整个文件夹for(File file:files){//如果是解密之前的文件就删除if(file.getName().equals("4028cb2450fa422a0150ff63da6b004f.rar")){file.delete();}}}//读取解密后的文件ByteArrayInputStream arrin =new ByteArrayInputStream(decryptResult);//输出文件流FileOutputStream output = new FileOutputStream("D:/aaa/4028cb2450fa422a0150ff63da6b004f.rar");byte[] bytes = new byte[1024];int len = 0;while((len=arrin.read(bytes))!=-1){//写入解密后的文件内容output.write(bytes,0,len);}output.close();arrin.close();}/** * 文件转换为二进制数组 * @param filePath * @return * @throws Exception */public static byte[] fileToByte(String filePath) throws Exception {byte[] data = new byte[0];File file = new File(filePath);if (file.exists()) {FileInputStream in = new FileInputStream(file);ByteArrayOutputStream out = new ByteArrayOutputStream(2048);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = in.read(cache)) != -1) {out.write(cache, 0, nRead);out.flush();}out.close();in.close();data = out.toByteArray();} return data;}}