출처 : http://www.imcore.net/encrypt-decrypt-aes256-c-objective-ios-iphone-ipad-php-java-android-perl-javascript-python/
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
/*
참고 : http://www.imcore.net/encrypt-decrypt-aes256-c-objective-ios-iphone-ipad-php-java-android-perl-javascript-python/
jce patch 적용 되어있어야 하며, commons-codec-1.10.jar 필요
*/
public class AES256Util {
public static byte[] ivBytes = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
/**
* 일반 문자열을 지정된 키를 이용하여 AES256 으로 암호화
* @param String - 암호화 대상 문자열
* @param String - 문자열 암호화에 사용될 키
* @return String - key 로 암호화된 문자열
* @exception
*/
public static String strEncode(String str, String key) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
byte[] textBytes = str.getBytes("UTF-8");
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
SecretKeySpec newKey = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
Cipher cipher = null;
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);
return Base64.encodeBase64String(cipher.doFinal(textBytes));
}
/**
* 암호화된 문자열을 지정된 키를 이용하여 AES256 으로 복호화
* @param String - 복호화 대상 문자열
* @param String - 문자열 복호화에 사용될 키
* @return String - key 로 복호화된 문자열
* @exception
*/
public static String strDecode(String str, String key) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
byte[] textBytes = Base64.decodeBase64(str);
//byte[] textBytes = str.getBytes("UTF-8");
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
SecretKeySpec newKey = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec);
return new String(cipher.doFinal(textBytes), "UTF-8");
}
}
사용은 아래 처럼...
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import org.apache.commons.codec.binary.Base64;
public class aes256EncTest {
public static void main(String[] args) throws UnsupportedEncodingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
String key = "12345678901234567890123456789012"; //key는 16~32자리
AES256Util aes256Util = new AES256Util();
/* XML 문자열 암호화 */
String encStr = aes256Util.strEncode(xmlStr, key);
System.out.println("encStr =============> " + encStr);
/* XML 문자열 복호화 */
String decStr = aes256Util.strDecode(encStr, key);
System.out.println("decStr =============> " + decStr);
}
}
