Question

我正在尝试编写加密或解密String的方法（主要是数字）。它适用于某些文本（例如，＆＃39; 1010000011＆＃39; 1010000012＆＃39; 1010000013＆＃39;）但是其他人会出现以下错误（例如＆＃39; 1010000014＆＃39;，＆＃39; 1010000018＆＃39;）：

javax.crypto.BadPaddingException：给定最终块不正确填充

这是我的代码：

public static SecretKey secKey;
private static IvParameterSpec ivspec;
static {
    try {
        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        KeySpec spec = new PBEKeySpec("i15646dont6321wanna".toCharArray(),
                "ahhalkdjfslk3205jlk3m4ljdfa85l".getBytes("UTF-8"), 65536, 256);
        SecretKey tmp = factory.generateSecret(spec);
        secKey = new SecretKeySpec(tmp.getEncoded(), "AES");
        byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        ivspec = new IvParameterSpec(iv);
    } catch (NoSuchAlgorithmException | InvalidKeySpecException | UnsupportedEncodingException e) {
        e.printStackTrace();
    }
}

public static String encryptData(String textToEncrypt) {

    byte[] encryptedBytes = null;
    String encryptedText = "";
    try {
        byte[] byteToEncrypt = textToEncrypt.getBytes(Charset.defaultCharset());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secKey, ivspec);
        encryptedBytes = cipher.doFinal(byteToEncrypt);
        encryptedText = new String(encryptedBytes);
    } catch (NoSuchAlgorithmException | IllegalBlockSizeException | BadPaddingException
            | InvalidKeyException | NoSuchPaddingException | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }
    return encryptedText;
}

public static String decryptData(String textToDecrypt) {

    byte[] decryptedBytes = null;
    String decryptedText = "";
    try {
        byte[] byteToDecrypt = textToDecrypt.getBytes(Charset.defaultCharset());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secKey, ivspec);
        decryptedBytes = cipher.doFinal(byteToDecrypt);
        decryptedText = new String(decryptedBytes);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
            | IllegalBlockSizeException | BadPaddingException
            | InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    }
    return decryptedText;
}

要加密的字符串从文件中读取，并在加密后写入其他文件。此加密文本必须稍后解密。我是按照以下方式调用这些方法的：

String[] lineArray = line.split(" | "); //line is read from a file. 
String encryptedText = AESEncryption.encryptData(lineArray[0]);
String decryptedText = AESEncryption.decryptData(encryptedText);
System.out.println("Original Text: " + lineArray[0] + " | Encrypted text: "
                + encryptedText + " | Decrypted again: " + decryptedText);

Answer 1

您正尝试将加密数据作为字符串传递。这是致命的。加密数据是字节，而不是字符串。使用Base64转换实用程序将加密的字节转换为Base64字符串。

加密：明文 - ＆gt;加密字节 - ＆gt; Base64文本。

解密：Base64文字 - ＆gt;加密字节 - ＆gt;解密文本。

AES加密/解密：给定最终块未正确填充

1 个答案: