jdk17 自带的加密算法 实现

JDK 17 自带了多种加密算法，可以通过Java标准库中的 `javax.crypto` 包进行实现。下面是一个使用 JDK 17 自带的 AES 算法进行加密和解密的实现代码：

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;

public class AESEncryptionExample {
    private static final String ALGORITHM = "AES";
    private static final int KEY_SIZE = 128;

    public static byte[] encrypt(String plainText, String key) throws Exception {
        byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
        byte[] plainTextBytes = plainText.getBytes(StandardCharsets.UTF_8);

        // Create a secret key from the given key bytes
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, ALGORITHM);

        // Initialize the cipher with the secret key and encrypt mode
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);

        // Encrypt the plain text
        byte[] encryptedTextBytes = cipher.doFinal(plainTextBytes);

        return encryptedTextBytes;
    }

    public static String decrypt(byte[] encryptedText, String key) throws Exception {
        byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);

        // Create a secret key from the given key bytes
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, ALGORITHM);

        // Initialize the cipher with the secret key and decrypt mode
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, keySpec);

        // Decrypt the encrypted text
        byte[] decryptedTextBytes = cipher.doFinal(encryptedText);

        return new String(decryptedTextBytes, StandardCharsets.UTF_8);
    }

    public static String generateKey() throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
        SecureRandom secureRandom = new SecureRandom();
        keyGenerator.init(KEY_SIZE, secureRandom);
        SecretKey secretKey = keyGenerator.generateKey();
        byte[] keyBytes = secretKey.getEncoded();
        return new String(keyBytes, StandardCharsets.UTF_8);
    }
}

这个实现包括了 AES 加密和解密的方法，使用时需要提供明文、密钥，或者密文和密钥。`generateKey` 方法可以生成一个随机的 AES 密钥，可以用于加密和解密。在实际使用中，需要注意密钥的生成和管理，以及使用恰当的加密算法和模式。