对称加密和非对称加密

1. 非对称

在pom.xml文件中添加以下依赖

<artifactId>spring-boot-starter-security</artifactId>

配置

@Configuration
public class AsymmetricEncryptionConfig {

    @Bean
    public KeyPair keyPair() throws NoSuchAlgorithmException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);
        return keyPairGenerator.generateKeyPair();
    }

    @Bean
    public String publicKey(KeyPair keyPair) {
        return new String(Base64.getEncoder().encode(keyPair.getPublic().getEncoded()));
    }

    @Bean
    public String privateKey(KeyPair keyPair) {
        return new String(Base64.getEncoder().encode(keyPair.getPrivate().getEncoded()));
    }
}

加密和解密代码

@Autowired
    private KeyPair keyPair;

    @GetMapping("/encrypt")
    public String encrypt(String plainText) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        PublicKey publicKey = keyPair.getPublic();
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    @GetMapping("/decrypt")
    public String decrypt(String encryptedText) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        PrivateKey privateKey = keyPair.getPrivate();
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] encryptedBytes = Base64.getDecoder().decode(encryptedText);
        byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
        return new String(decryptedBytes);
    }

2. 对称

在pom.xml文件中添加以下依赖

<artifactId>spring-boot-starter-security</artifactId>

加密和解密代码

public static SecretKey generateKey() throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(128);
        return keyGenerator.generateKey();
    }

    public static String encode(String plainText, SecretKey secretKey) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    public static String decode(String encryptedText, SecretKey secretKey) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decodedBytes = Base64.getDecoder().decode(encryptedText);
        byte[] decryptedBytes = cipher.doFinal(decodedBytes);
        return new String(decryptedBytes, StandardCharsets.UTF_8);
    }

    public static void main(String[] args) throws Exception {
        SecretKey secretKey = generateKey();

        String plainText = "Hello, World!";
        String encryptedText = encode(plainText, secretKey);
        System.out.println("Encrypted text: " + encryptedText);

        String decryptedText = decode(encryptedText, secretKey);
        System.out.println("Decrypted text: " + decryptedText);
    }