JAVA AES 256 암호화

aes256 암호화

import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;
 
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.NoSuchAlgorithmException;
 
public class AES256 {
  public static SecretKeySpec getKeySpec() throws IOException, NoSuchAlgorithmException {
        byte[] bytes = new byte[32];
        SecretKey key = null;
        SecretKeySpec spec = null;
/* 
        File f = new File("aes_key");
        if (f.exists()) {
          new FileInputStream(f).read(bytes);
        } else {
           KeyGenerator kgen = KeyGenerator.getInstance("AES");
           kgen.init(256);
           key = kgen.generateKey();
           bytes1 = key.getEncoded();
           new FileOutputStream(f).write(bytes1);
        }
*/
        String keyStr="암호화된 대칭키";
        bytes = Base64Utils.base64Decode(keyStr);

        spec = new SecretKeySpec(bytes,"AES");
        return spec;
  }


  public String encrypt(String text) throws Exception {
        SecretKeySpec spec = getKeySpec();
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, spec);
        BASE64Encoder enc = new BASE64Encoder();

        return enc.encode(cipher.doFinal(text.getBytes())).toString();
  }
  public String decrypt(String text) throws Exception {
        SecretKeySpec spec = getKeySpec();
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, spec);
        BASE64Decoder dec = new BASE64Decoder();
        return new String(cipher.doFinal(dec.decodeBuffer(text)));
  }
  public static void main(String[] args) throws Exception {
        String mode = "encrypt";
        String text = "!mpluse0218";
        String encText = "";
        String decText = "";
        AES256 aes = new AES256();
        encText=aes.encrypt(text);
        System.out.println("5ClhQFro0UAI+LrZkilamw==");
          System.out.println("enc::"+encText);
        decText = aes.decrypt(encText);
        System.out.println("dec::"+decText);
  }
}