public static SecretKey generateKey(int keySize) {
        KeyGenerator keyGenerator;
        try {
            keyGenerator = KeyGenerator.getInstance("AES");
            keyGenerator.init(keySize);
            return keyGenerator.generateKey();
        } catch (NoSuchAlgorithmException e) {
            // ignore
            return null;
        }
    }

/**
     * 生成非對(duì)稱(chēng)密鑰對(duì)
     *
     * @param keySize 密鑰大小
     * @param random  指定隨機(jī)來(lái)源，默認(rèn)使用 JCAUtil.getSecureRandom()
     * @return 非對(duì)稱(chēng)密鑰對(duì)
     * @throws NoSuchAlgorithmException NoSuchAlgorithm
     */
    public static PPKeys genKeysRSA(int keySize, SecureRandom random) throws NoSuchAlgorithmException {
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
        if (null != random) {
            generator.initialize(keySize, random);
        } else {
            generator.initialize(keySize);
        }
        KeyPair pair = generator.generateKeyPair();
        PPKeys keys = new PPKeys();
        PublicKey publicKey = pair.getPublic();
        PrivateKey privateKey = pair.getPrivate();
        keys.setPublicKey(Base64.getEncoder().encodeToString(publicKey.getEncoded()));
      keys.setPrivateKey(Base64.getEncoder().encodeToString(privateKey.getEncoded()));
        return keys;
    }

public static void diffieHellman() throws Exception {
        AlgorithmParameterGenerator dhParams = AlgorithmParameterGenerator.getInstance("DH");
        dhParams.init(1024);
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH");
        keyGen.initialize(dhParams.generateParameters().getParameterSpec(DHParameterSpec.class), new SecureRandom());

        KeyAgreement aliceKeyAgree = KeyAgreement.getInstance("DH");
        KeyPair alicePair = keyGen.generateKeyPair();
        KeyAgreement bobKeyAgree = KeyAgreement.getInstance("DH");
        KeyPair bobPair = keyGen.generateKeyPair();

        aliceKeyAgree.init(alicePair.getPrivate());
        bobKeyAgree.init(bobPair.getPrivate());

        aliceKeyAgree.doPhase(bobPair.getPublic(), true);
        bobKeyAgree.doPhase(alicePair.getPublic(), true);

       boolean agree = Base64.getEncoder().encodeToString(aliceKeyAgree.generateSecret()).equals(
          Base64.getEncoder().encodeToString(bobKeyAgree.generateSecret())
        );
        System.out.println(agree);
    }

public static String md5(String content) {
        try {
            MessageDigest digest = MessageDigest.getInstance("MD5");
            byte[] bytes = digest.digest(content.getBytes(StandardCharsets.UTF_8));
            return Hex.encodeHexString(bytes);
        } catch (final NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e);
        }
    }

public static String sha256(String content) {
        try {
            MessageDigest digest = MessageDigest.getInstance("SHA-256);
            byte[] bytes = digest.digest(content.getBytes(StandardCharsets.UTF_8));
            return Hex.encodeHexString(bytes);
        } catch (final NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e);
        }
    }

public static String encryptDES(byte[] content, String password) {
        try {
            SecureRandom random = new SecureRandom();
            DESKeySpec desKeySpec = new DESKeySpec(password.getBytes());
            SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = secretKeyFactory.generateSecret(desKeySpec);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, random);
            return Base64.getEncoder().encodeToString(cipher.doFinal(content));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String decryptDES(String content, String password) throws Exception {
        SecureRandom random = new SecureRandom();
        DESKeySpec desKeySpec = new DESKeySpec(password.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, random);
        return new String(cipher.doFinal(Base64.getDecoder().decode(content)));
    }

public static String encrypt3DESECB(String content, String key, String iv) {
        try {
            IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
            DESedeKeySpec dks = new DESedeKeySpec(key.getBytes(StandardCharsets.UTF_8));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
            SecretKey secretkey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretkey, ivSpec);
            return Base64.getEncoder().encodeToString(cipher.doFinal(content.getBytes(StandardCharsets.UTF_8)));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String decrypt3DESECB(String content, String key, String iv) {
        try {
            IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
            DESedeKeySpec dks = new DESedeKeySpec(key.getBytes(StandardCharsets.UTF_8));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
            SecretKey secretkey = keyFactory.generateSecret(dks);
            Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secretkey, ivSpec);
            return new String(cipher.doFinal(Base64.getDecoder().decode(content)), StandardCharsets.UTF_8);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

public static String encryptAES128(String plainText, String password, String salt) throws Exception {
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        byte[] saltBytes = salt.getBytes(StandardCharsets.UTF_8);
        // AES-128 密鑰長(zhǎng)度為128bit
        PBEKeySpec spec = new PBEKeySpec(
          password.toCharArray(),
          saltBytes,
          1000,
          128
        );
        SecretKey secretKey = factory.generateSecret(spec);
        SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        AlgorithmParameters params = cipher.getParameters();
        IvParameterSpec iv = params.getParameterSpec(IvParameterSpec.class);

        cipher.init(Cipher.ENCRYPT_MODE, secret, iv);
        byte[] encryptedTextBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));

        String encodedText = Base64.getEncoder().encodeToString(encryptedTextBytes);
        String encodedIV = Base64.getEncoder().encodeToString(iv.getIV());
        String encodedSalt = Base64.getEncoder().encodeToString(saltBytes);
        return encodedSalt + "." + encodedIV + "." + encodedText;
    }


    public static String decryptAES128(String encryptedText, String password) throws Exception {
        String[] fields = encryptedText.split("\\.");
        byte[] saltBytes = Base64.getDecoder().decode(fields[0]);
        byte[] ivBytes = Base64.getDecoder().decode(fields[1]);
        byte[] encryptedTextBytes = Base64.getDecoder().decode(fields[2]);

        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        PBEKeySpec spec = new PBEKeySpec(
          password.toCharArray(),
          saltBytes,
          1000,
          128
        );

        SecretKey secretKey = factory.generateSecret(spec);
        SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(ivBytes));
        byte[] decryptedTextBytes;
        try {
            decryptedTextBytes = cipher.doFinal(encryptedTextBytes);
            return new String(decryptedTextBytes);
        } catch (IllegalBlockSizeException | BadPaddingException e) {
            throw new RuntimeException(e);
        }
    }

java.security.InvalidKeyException: Illegal key size

static {
        java.security.Security.setProperty("crypto.policy", "unlimited");
    }

public static String encrypt(byte[] publicKey, String plainText) {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey);
        KeyFactory kf;
        try {
            kf = KeyFactory.getInstance("RSA");
            PublicKey publicKeySecret = kf.generatePublic(keySpec);
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.ENCRYPT_MODE, publicKeySecret);
            byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
            return new String(Base64.getEncoder().encode(encryptedBytes));
        } catch (Exception e) {
            log.error("Rsa encrypt error ", e);
            throw new RuntimeException(e);
        }
    }

    public static String decrypt(byte[] privateKey, String encryptedText) {
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);
        KeyFactory kf;
        try {
            kf = KeyFactory.getInstance("RSA");
            PrivateKey privateKeySecret = kf.generatePrivate(keySpec);
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.DECRYPT_MODE, privateKeySecret);
            return new String(cipher.doFinal(Base64.getDecoder().decode(encryptedText)), StandardCharsets.UTF_8);
        } catch (Exception e) {
            log.error("Rsa decrypt error ", e);
            throw new RuntimeException(e);
        }
    }