AES 128비트 암호화(ECB 모드, PKCS5Padding)

AES 128 비트 암호화 / 복호화

ECB 모드 <-- 중요(CBC 아님)

PKCS5Padding <-- 패딩방식

자바 버전

import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class Aes128 { /** * 암호화 * * @param input * @param key * @return */ public static String encrypt(String input, String key) { byte[] crypted = null; try { SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, skey); crypted = cipher.doFinal(input.getBytes()); } catch(Exception e) { System.out.println(e.toString()); } BASE64Encoder encoder = new BASE64Encoder(); String str = encoder.encode(crypted); return new String(str); } /** * 복호화 * * @param input * @param key * @return */ public static String decrypt(String input, String key) { byte[] output = null; try { BASE64Decoder decoder = new BASE64Decoder(); SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, skey); output = cipher.doFinal(decoder.decodeBuffer(input)); } catch(Exception e) { System.out.println(e.toString()); } return new String(output); } }

사용 방법

public void aes_enc() throws Exception { Aes128 aes = new Aes128(); String key = "0123456789abcdef"; String str = "yangyag"; String encode = aes.encrypt(str, key); System.out.println("encode--->" + encode); } public void aes_dec() throws Exception { Aes128 aes = new Aes128(); String key = "0123456789abcdef"; String str = "bcOXU9eLYKadQejOHkjvbg=="; String decode = aes.decrypt(str, key); System.out.println("decode--->" + decode); }

암/복호화 알고리즘 테스트 사이트 : https://seed.kisa.or.kr/iwt/ko/guide/EncryptExercise.do