import java.lang.RuntimeException;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.*;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) {
String aesKey = "BuzzvilAESKeyTest123456789101112";
String aesIV = "0000000000000000";
// Check to make sure encryption is compatible with Buzzvil
String toBuzzvilMessage = "{\"success\": 1, \"reason\": \"중복 적립 요청\"}";
String encrypted = encrypt(toBuzzvilMessage, aesKey, aesIV);
System.out.println("----encrypted----\n"+encrypted);
System.out.println("buzzvil encryption compatible? YES");
// Check to make sure values coming from Buzzvil is decryptable
String fromBuzzvilEncrypted = "IGCdundUBkXf3s7VXl0pqIKDSC/KGc2j8n1DBLKLZAHqkYlG+aWW+G5hGLvoNeUjlI42FtJLpwGUYbFlhy0QXLQv1Z+P7iUOyJrhujmFWX1FdJ5ZBefA5aceGiOlN119NPAX3JOuUAf45HkWG52NcdaHOzWu8rTnghSeLPo9QK0t6l/2gSFvGtOfZolnAHNZAeGEmcqAkhPmUoFtRAW+Zh6TNQY68FrSUI/XYc87Ky0ndaug1Kf7Ogbf8zLK+tJ4LdTCn9A+wcWxEpdkX45f1r/8jTIUK/s1PqBirXFuruq5/XhkhFmdq/I0qBAJ0uxBnk+29GaEQVMtYTzB+eJWTgrQzKhN6Nww2XEPEOl27yH+K0F+sj8QpZ0jkPETadP0gpwKMKv3zlA6xyndIYWrpw==";
String fromBuzzvilDecrypted = "{\"point\": 1, \"user_id\": \"buzzvil_test\", \"transaction_id\": \"100004_100000000\", \"event_at\": 1588936508, \"campaign_name\": \"버즈빌 테스트 campaign_name\", \"extra\": \"{}\", \"action_type\": \"l\", \"base_point\": 1, \"campaign_id\": 202010160022, \"is_media\": 1, \"unit_id\": 452613281179508, \"revenue_type\": \"cpm\"}";
String decrypted = decrypt(fromBuzzvilEncrypted, aesKey, aesIV);
System.out.println("----decrypted-----\n"+decrypted);
System.out.println("buzzvil decryption compatible? "+fromBuzzvilDecrypted.equals(decrypted));
}
static String encrypt(String message, String key, String iv) {
try {
// 1. encode in utf-8
byte[] messageBytes = message.getBytes(StandardCharsets.UTF_8);
// 2. encrypt message through AES CBC with PKCS7
byte[] encrypted = aes(messageBytes, key, iv, Cipher.ENCRYPT_MODE);
// 3. encode in base64
return Base64.getEncoder().encodeToString(encrypted);
} catch (Exception e) {
System.out.println(e.getMessage());
throw new RuntimeException(e);
}
}
static String decrypt(String message, String key, String iv) {
try {
// 1. decode base64 message
byte[] base64DecodedBytes = Base64.getDecoder().decode(message);
// 2. decrypt message through AES CBC with PKCS7
byte[] decrypted = aes(base64DecodedBytes, key, iv, Cipher.DECRYPT_MODE);
// 3. decode in utf-8
return new String(decrypted, StandardCharsets.UTF_8);
} catch (Exception e) {
System.out.println(e.getMessage());
throw new RuntimeException(e);
}
}
static byte[] aes(byte[] messageBytes, String key, String iv, int cipherMode) {
try {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
byte[] ivBytes = iv.getBytes(StandardCharsets.UTF_8);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(cipherMode, keySpec, ivSpec);
return cipher.doFinal(messageBytes);
} catch (Exception e) {
System.out.println(e.getMessage());
throw new RuntimeException(e);
}
}
} | 
現在日本では対象なし)