コメントからコードを生成する

package org.com.passwordmanager.service;

import org.springframework.stereotype.Service;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

@Service
public class EncryptionService {

    private final SecretKey secretKey;

    public EncryptionService() throws Exception {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(256);
        secretKey = keyGen.generateKey();
    }

    public String encrypt(String data) {
        try {
            // Create and initialize a Cipher instance for AES encryption
            // Encrypt the data bytes using the Cipher instance
            // Encode the encrypted bytes to a Base64 string and return the result
            // <WRITE CODE HERE>
        } catch (Exception e) {
            throw new RuntimeException("Encryption error", e);
        }
    }

    public String decrypt(String encryptedData) {
        try {
            // Create and initialize a Cipher instance for AES decryption
            // Decode the Base64 string to get the encrypted bytes
            // Decrypt the encrypted bytes
            // Convert decrypted bytes to a string and return the result
            // <WRITE CODE HERE>
        } catch (Exception e) {
            throw new RuntimeException("Decryption error", e);
        }
    }
}

package org.com.passwordmanager.service;

import org.springframework.stereotype.Service;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

@Service
public class EncryptionService {

    private final SecretKey secretKey;

    public EncryptionService() throws Exception {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(256);
        secretKey = keyGen.generateKey();
    }

    public String encrypt(String data) {
        try {
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            byte[] encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
            return Base64.getEncoder().encodeToString(encryptedBytes);
        } catch (Exception e) {
            throw new RuntimeException("Encryption error", e);
        }
    }

    public String decrypt(String encryptedData) {
        try {
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            byte[] decodedBytes = Base64.getDecoder().decode(encryptedData);
            byte[] decryptedBytes = cipher.doFinal(decodedBytes);
            return new String(decryptedBytes, StandardCharsets.UTF_8);
        } catch (Exception e) {
            throw new RuntimeException("Decryption error", e);
        }
    }
}