技術標籤：JAVA加密解密加密解密javarsa

1. 工具類程式碼

public class AESEncryptUtil {
     //private static final transient Logger log = LoggerFactory.getLogger(AESEncryptUtil.class);

     public AESEncryptUtil() {
     }

     public static byte[] encrypt(byte[] bytes, String password) {
         try {
             KeyGenerator e =
 
 KeyGenerator.getInstance("AES");
             SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
             secureRandom.setSeed(password.getBytes("utf-8"));
             e.init(128, secureRandom);
             SecretKey secretKey = e.generateKey();
             byte
 
[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
             cipher.init(1, key, getSpec(cipher, secureRandom));
             return cipher.doFinal
 
(bytes);
         } catch (Exception var8) {
             //log.error(var8.getMessage(), var8);
             var8.printStackTrace();
             System.out.println("AESEncryptUtil exception:" + var8.getMessage());
             return null;
         }
     }

     public static byte[] decrypt(byte[] content, String password) {
         try {
             KeyGenerator e = KeyGenerator.getInstance("AES");
             SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
             secureRandom.setSeed(password.getBytes("utf-8"));
             e.init(128, secureRandom);
             SecretKey secretKey = e.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
             cipher.init(2, key, getSpec(cipher, secureRandom));
             return cipher.doFinal(content);
         } catch (Exception var8) {
             //log.error(var8.getMessage(), var8);
             var8.printStackTrace();
             System.out.println("AESEncryptUtil exception:" + var8.getMessage());
             return null;
         }
     }

     private static AlgorithmParameterSpec getSpec(Cipher cipher, SecureRandom secureRandom) {
         byte[] iv = new byte[cipher.getBlockSize()];
         secureRandom.nextBytes(iv);
         IvParameterSpec ivspec = new IvParameterSpec(iv);
         return ivspec;
     }
 }

3. 呼叫示例

public static  void main(String[] args) throws Exception{
        byte[] encrypt = AESEncryptUtil.encrypt("HZT_2020".getBytes(), "123");
        String s = DatatypeConverter.printHexBinary(encrypt);
        System.out.println(s);
        byte[] bytes = DatatypeConverter.parseHexBinary(s);
        byte[] decrypt = AESEncryptUtil.decrypt(bytes, "123");
        String mm = new String(decrypt,"UTF-8");
        System.out.println(mm);

    }

5. 測試結果
   
6. 參考文章
   用到了工具類：javax.xml.bind.DatatypeConverter ，將byte陣列轉化為16進位制字串輸出。之前沒用此工具類方法時，解密時報錯：
   Input length must be multiple of 16 when decrypting with padded cipher。
   參考文章地址，點此進入