java AES 加密与解密

1. package com.ss.util.secret;
    
   import java.io.UnsupportedEncodingException;
   import java.security.InvalidKeyException;
   import java.security.NoSuchAlgorithmException;
   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;
    
   /**
   **
   * AES128 算法，加密模式为ECB，填充模式为 pkcs7（实际就是pkcs5）
   *
   *
   */
   public class AESUtils {
    
   /**
   * 加密
   *
   * @param content 需要加密的内容
   * @param key 加密密码
   * @return
   */
   public static byte[] encrypt(String content, String key) {
   try {
   KeyGenerator kgen = KeyGenerator.getInstance("AES");
   kgen.init(128, new java.security.SecureRandom(key.getBytes()));
   SecretKey secretKey = kgen.generateKey();
   byte[] enCodeFormat = secretKey.getEncoded();
   SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
   Cipher cipher = Cipher.getInstance("AES");// 创建密码器
   byte[] byteContent = content.getBytes("UTF-8");
   cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);// 初始化
   byte[] result = cipher.doFinal(byteContent);
   return result; // 加密
   } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
   } catch (NoSuchPaddingException e) {
   e.printStackTrace();
   } catch (InvalidKeyException e) {
   e.printStackTrace();
   } catch (UnsupportedEncodingException 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 key 解密密钥
   * @return
   */
   public static byte[] decrypt(byte[] content, String key) {
   try {
   KeyGenerator kgen = KeyGenerator.getInstance("AES");
   kgen.init(128, new java.security.SecureRandom(key.getBytes()));
   SecretKey secretKey = kgen.generateKey();
   byte[] enCodeFormat = secretKey.getEncoded();
   SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");
   Cipher cipher = Cipher.getInstance("AES");// 创建密码器
   cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);// 初始化
   byte[] result = cipher.doFinal(content);
   return result; // 加密
   } 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;
   }
    
   /**
   * 字符串加密
   * @param content 要加密的字符串
   * @param key 加密的AES Key
   * @return
   */
   public static String encryptString(String content, String key) {
   return parseByte2HexStr( encrypt(content, key));
   }
    
   /**
   * 字符串解密
   * @param content 要解密的字符串
   * @param key 解密的AES Key
   * @return
   */
   public static String decryptString(String content, String key){
   byte[] decryptFrom = parseHexStr2Byte(content);
   byte[] decryptResult = decrypt(decryptFrom,key);
   return new String(decryptResult);
   }
    
    
   /**将16进制转换为二进制
   * @param hexStr
   * @return
   */
   public 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;
   }
    
    
   /**将二进制转换成16进制
   * @param buf
   * @return
   */
   public 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();
   }
    
   public static void main(String aregs[]){
   String content = "协议加密Test&123";
   String key = "25d55ad283aa400af464c76d713c07ad";
   try {
   //加密
   System.out.println("加密前：" + content);
   String encrypt = AESUtils.encryptString(content, key);
   System.out.println("加密后：" + encrypt);
   //解密
   String decrypt = AESUtils.decryptString(encrypt, key);
   System.out.println("解密后：" + decrypt);
   } catch (Exception e) {
   e.printStackTrace();
   }
    
   }
   }

运行结果：

加密前：协议加密Test&123
加密后：7D07155438880C51E50433C17D9AFF8DCB2A9596AF46B2ABA33C18918053E3E0
解密后：协议加密Test&123