nodejs和Java中的AES GCM加密解密

如何解决nodejs和Java中的AES GCM加密解密

因此，我们在 nodejs 中使用 AES GCM 加密和解密，如下所示， 我们需要在 Java 中使用它。所以可以在Java中加密，在nodeJs中解密，反之亦然。

这里是节点中的加密解密函数

const encrypt = (text,masterkey) => {
    // random initialization vector
    const iv = crypto.randomBytes(16);

    // random salt
    const salt = crypto.randomBytes(64);

    // derive encryption key: 32 byte key length
    // in assumption the masterkey is a cryptographic and NOT a password there is no need for
    // a large number of iterations. It may can replaced by HKDF
    // the value of 2145 is randomly chosen!
    const key = crypto.pbkdf2Sync(masterkey,salt,2145,32,'sha512');

    // AES 256 GCM Mode
    const cipher = crypto.createCipheriv('aes-256-gcm',key,iv);

    // encrypt the given text
    const encrypted = Buffer.concat([
        cipher.update(text,'utf8'),cipher.final()
    ]);

    // extract the auth tag
    const tag = cipher.getAuthTag();

    // generate output
    return Buffer.concat([salt,iv,tag,encrypted]).toString('base64');
};

const decrypt = (encdata,masterkey) => {
    // base64 decoding
    const bData = Buffer.from(encdata,'base64');

    // convert data to buffers
    const salt = bData.slice(0,64);
    const iv = bData.slice(64,80);
    const tag = bData.slice(80,96);
    const text = bData.slice(96);

    // derive key using; 32 byte key length
    const key = crypto.pbkdf2Sync(masterkey,'sha512');

    // AES 256 GCM Mode
    const decipher = crypto.createDecipheriv('aes-256-gcm',iv);
    decipher.setAuthTag(tag);

    // encrypt the given text
    return decipher.update(text,'binary','utf8') + decipher.final('utf8');
};

这是我在 Java 中所做的，但遇到 input too short 异常。 我也尝试在上面的 nodeJs 加密函数中进行模拟，但它似乎不起作用。 我有与 nodejs 相同的初始化向量（IV）、salt、密钥（在 Java 中它被签名为 128 位）

public static String decrypt(String encData,String masterKey)
    {
        var cipherText = Base64.getDecoder().decode(encData.getBytes(StandardCharsets.UTF_8));
        var salt = Arrays.copyOfRange(cipherText,64);
        var iv = Arrays.copyOfRange(cipherText,64,80);
        var tag = Arrays.copyOfRange(cipherText,80,96);
        var ciphertext = Arrays.copyOfRange(cipherText,96,cipherText.length);
        var key = getKeyFromPassword(masterKey,salt);
    //GCM_TAG_LENGTH = 16
        return helper("AES/GCM/NoPadding",ciphertext,new GCMParameterSpec(GCM_TAG_LENGTH * 8,iv));
    }

public static SecretKey getKeyFromPassword(String masterKey,byte[] salt) {

        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512");
        KeySpec spec = new PBEKeySpec(masterKey.toCharArray(),256);
        SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
                .getEncoded(),"AES");
        return secret;
    }

    public static String helper(String algorithm,byte[] cipherText,SecretKey key,GCMParameterSpec gcmParameterSpec){
          Cipher cipher = Cipher.getInstance(algorithm);
          cipher.init(Cipher.DECRYPT_MODE,gcmParameterSpec);
          cipher.update(cipherText);
          byte[] plainText = cipher.doFinal(tag);
          return new String(plainText,StandardCharsets.UTF_8);
    }

更新：上面的代码适用于java中的解密

但现在需要在java中加密

这就是我正在做的事情，但在解密时出现 Tag mismatch! 异常。我也更改了标记和密码文本的顺序，但仍然出现相同的错误。

public static String encrypt(String text,String masterKey)
    {
        var iv = generateIv(16);
        var salt = generateIv(64);
        var key = getKeyFromPassword(masterKey,salt);
        var cipher = helper1("AES/GCM/NoPadding",text,iv));
        var outputStream = new ByteArrayOutputStream();
        var tag = Arrays.copyOfRange(cipher,16);
        var ciphertext = Arrays.copyOfRange(cipher,16,cipher.length);
        outputStream.write(salt);
        outputStream.write(iv);
        outputStream.write(tag);
        outputStream.write(ciphertext);
        return Base64.getEncoder().encodeToString(outputStream.toByteArray());
    }

public static byte[] generateIv(int N) {
        byte[] iv = new byte[N];
        new SecureRandom().nextBytes(iv);
        return iv;
    }
    
public static byte[] helper1(String algorithm,String input,GCMParameterSpec gcmParameterSpec){

        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE,gcmParameterSpec);
        return cipher.doFinal(input.getBytes());
    }

public static SecretKey getKeyFromPassword(String masterKey,"AES");
        return secret;
    }

解决方法

所以，我将 Java 版本的加密和解密功能放在这里

public static byte[] generateIv(int N) {
        byte[] iv = new byte[N];
        new SecureRandom().nextBytes(iv);
        return iv;
    }

    
    public static SecretKey getKeyFromPassword(String masterKey,byte[] salt) {

        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512");
        KeySpec spec = new PBEKeySpec(masterKey.toCharArray(),salt,2145,256);
        SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
                .getEncoded(),"AES");
        return secret;
    }

    
    public static byte[] encryptHelper(String algorithm,String input,SecretKey key,GCMParameterSpec gcmParameterSpec){

        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE,key,gcmParameterSpec);
        return cipher.doFinal(input.getBytes());
    }

    @SneakyThrows
    public static String decryptHelper(String algorithm,byte[] cipherText,byte[] tag,GCMParameterSpec gcmParameterSpec){
          Cipher cipher = Cipher.getInstance(algorithm);
          cipher.init(Cipher.DECRYPT_MODE,gcmParameterSpec);
          cipher.update(cipherText);
          byte[] plainText = cipher.doFinal(tag);
          return new String(plainText,StandardCharsets.UTF_8);
    }

    
    public static String encrypt(String text,String masterKey)
    {
        var iv = generateIv(16);
        var salt = generateIv(64);
        var key = getKeyFromPassword(masterKey,salt);
        var cipher = encryptHelper("AES/GCM/NoPadding",text,new GCMParameterSpec(GCM_TAG_LENGTH * 8,iv));
        var outputStream = new ByteArrayOutputStream();
        var ciphertext = Arrays.copyOfRange(cipher,text.length());
        var tag = Arrays.copyOfRange(cipher,text.length(),cipher.length);
        outputStream.write(salt);
        outputStream.write(iv);
        outputStream.write(tag);
        outputStream.write(ciphertext);
        return Base64.getEncoder().encodeToString(outputStream.toByteArray());
    }

    
    public static String decrypt(String encData,String masterKey)
    {
        var cipherText = Base64.getDecoder().decode(encData.getBytes(StandardCharsets.UTF_8));
        var salt = Arrays.copyOfRange(cipherText,64);
        var iv = Arrays.copyOfRange(cipherText,64,80);
        var tag = Arrays.copyOfRange(cipherText,80,96);
        var ciphertext = Arrays.copyOfRange(cipherText,96,cipherText.length);
        var key = getKeyFromPassword(masterKey,salt);
        return decryptHelper("AES/GCM/NoPadding",ciphertext,tag,iv));
    }