Question

我已经实现了AES - Decryption方法，如下所示 - 这是完美的。（我从其他程序收到加密文本）

public static String decrypt(String encryptedText, byte[] keyValue)
    {
        try
        {
            byte[] inputArr = Base64.getUrlDecoder().decode(encryptedText);
            SecretKeySpec skSpec = new SecretKeySpec(keyValue, "AES");
            Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
            int blockSize = cipher.getBlockSize();
            IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(inputArr, blockSize));
            byte[] dataToDecrypt = Arrays.copyOfRange(inputArr, blockSize, inputArr.length);
            cipher.init(Cipher.DECRYPT_MODE, skSpec, iv);
            byte[] result = cipher.doFinal(dataToDecrypt);
            return new String(result, StandardCharsets.UTF_8);
        }
        catch (Exception e)
        {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }

虽然我使用下面的代码加密文本（在发送到其他程序之前）没有产生预期的输出（如果我使用上面的解密程序来验证它只是返回null）

public static String encrypt(String strToEncrypt,  String key)
    {
        try
        {
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
            int blockSize = cipher.getBlockSize();
            IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(strToEncrypt.getBytes(), blockSize));
            byte[] dataToDecrypt = Arrays.copyOfRange(strToEncrypt.getBytes(), blockSize, strToEncrypt.getBytes().length);
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(dataToDecrypt);
            return Base64.getEncoder().encodeToString(encrypted);
        }
        catch (Exception e)
        {
            System.out.println("Error while encrypting: " + e.toString());
        }
        return null;
    }

我错过了什么吗？

AES加密/解密不匹配

0 个答案: