Question

cI编写了用于加密和解密byte []的代码。当我将填充模式设置为PKCS7时，我得到无效的填充错误。虽然，当我将填充模式更改为零时，加密和解密工作正常。以下是代码，如果有人可以看看，看看他们是否可以指出问题：

public static byte[] encryptBytes(byte[] plainText, string keyPath)
    {
        if (plainText == null || plainText.Length <= 0)
            throw new ArgumentNullException("plainText");
        byte[] cipherText = new byte[plainText.Length];
        using (RijndaelManaged rijAlg = new RijndaelManaged())
        {
            byte[] tempKey, tempIV;
            int keySize = ((int)(new FileInfo(keyPath).Length)) - 16;
            readKeyIV(keyPath, keySize, out tempKey, out tempIV);
            rijAlg.Padding = PaddingMode.Zeros;
            rijAlg.Mode = CipherMode.CBC;
            rijAlg.KeySize = keySize * 8;
            rijAlg.BlockSize = rijAlg.KeySize;
            rijAlg.Key = tempKey;
            rijAlg.IV = tempIV;

            ICryptoTransform encryptor = rijAlg.CreateEncryptor();
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    //Write all data to the stream
                    csEncrypt.Write(plainText, 0, plainText.Length);
                }
                cipherText = msEncrypt.ToArray();
            }
            return cipherText;
        }
    }

    /// <summary>
    /// takes a byte array of cipher text and a key then returns the decrypted byte array
    /// </summary>
    /// <param name="cipher"></param>
    /// <param name="keyPath"></param>
    public static byte[] decryptBytes(byte[] cipher, string keyPath)
    {
        if (cipher == null || cipher.Length <= 0)
            throw new ArgumentNullException("plainText");
        byte[] plainText = new byte[cipher.Length];

        using (RijndaelManaged rijAlg = new RijndaelManaged())
        {

            byte[] tempKey, tempIV;
            int keySize = ((int)(new FileInfo(keyPath).Length)) - 16;
            readKeyIV(keyPath, keySize, out tempKey, out tempIV);
            rijAlg.Padding = PaddingMode.Zeros;
            rijAlg.KeySize = keySize * 8;
            rijAlg.BlockSize = rijAlg.KeySize;
            rijAlg.Mode = CipherMode.CBC;
            rijAlg.Key = tempKey;
            rijAlg.IV = tempIV;

            ICryptoTransform decryptor = rijAlg.CreateDecryptor();

            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Write))
                {
                    //Write all data to the stream
                    csEncrypt.Write(cipher, 0, cipher.Length);
                }
                plainText = msEncrypt.ToArray();
            }
            return plainText;
        }
    }

从磁盘上的文件读取密钥和IV，并在调用函数之前生成。我做了大量的研究，发现了一些我在发布这个问题之前尝试过的解决方案，但它们并不适用于我。

FlushFinalBlock（）无法正常工作
在密钥和IV之前设置密钥大小还有一些我尝试过但没有用的东西，但这些是主要的。

有谁能告诉我我做错了什么以及为什么错了。

编辑：解密数据时会出现问题。我测试它的方法是读取一个文件并将其内容传递给encryptBytes函数，以加密形式将其写入磁盘，将其读回并将其提供给decryptBytes函数，然后以解密形式将结果存储在磁盘上。正如我所说的，如果我使用Zeros填充，一切都很好，但是一旦我将其更改为PKCS7，它就会给我错误。感谢

使用PKCS7进行加密时“填充无效且无法删除”，但使用Zeros可以正常工作

0 个答案: