import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import au.com.bytecode.opencsv.*;

public class CSVEncryptionExample {

    private static final String ALGORITHM = "AES";
    private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
    private static final String SECRET_KEY = "mySecretKey12345";
    private static final String IV_PARAMETER = "myIVParameter123";

    public static void main(String[] args) {
        try {
            // CSV 파일 읽기
            CSVReader reader = new CSVReader(new FileReader("data.csv"));
            // 암호화된 데이터를 저장할 CSV 파일 작성
            CSVWriter writer = new CSVWriter(new FileWriter("encrypted_data.csv"));
            String[] nextLine;
            while ((nextLine = reader.readNext()) != null) {
                String[] encryptedLine = encryptData(nextLine);
                writer.writeNext(encryptedLine);
            }
            // 파일 닫기
            reader.close();
            writer.close();

            System.out.println("CSV 파일의 데이터가 암호화되어 encrypted_data.csv에 저장되었습니다.");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    // 데이터 암호화 메소드
    private static String[] encryptData(String[] data) throws Exception {
        Cipher cipher = Cipher.getInstance(TRANSFORMATION);
        SecretKeySpec secretKeySpec = new SecretKeySpec(SECRET_KEY.getBytes(), ALGORITHM);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(IV_PARAMETER.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);

        String[] encryptedData = new String[data.length];
        for (int i = 0; i < data.length; i++) {
            byte[] encryptedBytes = cipher.doFinal(data[i].getBytes());
            encryptedData[i] = javax.xml.bind.DatatypeConverter.printHexBinary(encryptedBytes);
        }

        return encryptedData;
    }
}