Danhobak Story: aes256

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);
}
}

Danhobak Story

2010년 3월 29일 월요일

JAVA AES 256 암호화

AES 256 암호화 오류