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java - CryptoJs 解密函数的加密函数

问题描述

我有下一个从正确答案复制而来的代码：

public static String decrypt(String cipherText) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        byte[] cipherData = Base64.getDecoder().decode(cipherText);
        byte[] saltData = Arrays.copyOfRange(cipherData, 8, 16);

        MessageDigest md5 = MessageDigest.getInstance("MD5");
        final byte[][] keyAndIV = generateKeyAndIV(32, 16, 1, saltData, secret.getBytes(StandardCharsets.UTF_8), md5);
        SecretKeySpec key = new SecretKeySpec(keyAndIV[0], "AES");
        IvParameterSpec iv = new IvParameterSpec(keyAndIV[1]);

        byte[] encrypted = Arrays.copyOfRange(cipherData, 16, cipherData.length);
        Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");
        aesCBC.init(Cipher.DECRYPT_MODE, key, iv);
        byte[] decryptedData = aesCBC.doFinal(encrypted);
        String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

        return decryptedText;
    }

如何在 Java 中为此编写加密函数？我尝试过这样的事情，但它不起作用：

public static String encrypt(String plainText) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        final byte[][] keyAndIV = generateKeyAndIV(32, 16, 1, getNextSalt(), secret.getBytes(StandardCharsets.UTF_8), md5);
        SecretKeySpec skeySpec = new SecretKeySpec(keyAndIV[0], "AES");
        IvParameterSpec iv = new IvParameterSpec(keyAndIV[1]);

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(plainText.getBytes());

        return Base64.getEncoder().encodeToString(encrypted);
    }

    public static byte[] getNextSalt() {
        byte[] salt = new byte[8];
        RANDOM.nextBytes(salt);
        return salt;
    }

标签： javaencryptionaessaltcryptojs

解决方案

encrypt- 方法必须以 OpenSSL 格式返回数据，该格式由 Salted__ 的 ASCII 编码组成，后跟 8 字节随机生成的 salt 和实际密文，其中数据在连接后进行 Base64 编码。

但是请注意，用于 OpenSSL 格式的密钥派生函数是不安全的，并且不是标准，here。该方法的可能扩展encrypt可能是：

public static String encrypt(String plainText) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {

    byte[] salt =  getNextSalt();
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    final byte[][] keyAndIV = generateKeyAndIV(32, 16, 1, salt, secret.getBytes(StandardCharsets.UTF_8), md5);
    SecretKeySpec skeySpec = new SecretKeySpec(keyAndIV[0], "AES");
    IvParameterSpec iv = new IvParameterSpec(keyAndIV[1]);

    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
    byte[] encrypted = cipher.doFinal(plainText.getBytes());

    byte[] prefix = "Salted__".getBytes(StandardCharsets.US_ASCII);
    byte[] prefixSaltEncrypted = new byte[prefix.length + salt.length + encrypted.length];
    System.arraycopy(prefix, 0, prefixSaltEncrypted, 0, prefix.length);
    System.arraycopy(salt, 0, prefixSaltEncrypted, prefix.length, salt.length);
    System.arraycopy(encrypted, 0, prefixSaltEncrypted, prefix.length + salt.length, encrypted.length);

    return Base64.getEncoder().encodeToString(prefixSaltEncrypted);
}

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