c# - WinRT 中的 Rijndael 解密

Question

我正在尝试编写一个解密字节数组的方法。

• key 固定且24字节长

当我对数据进行实际解密时出现异常The supplied user buffer is not valid for the requested operation，我希望有人能帮助我!

        // Get the key and put into IBuffers

        IBuffer keyBuffer = CryptographicBuffer.CreateFromByteArray(cKey);
        IBuffer plainText = CryptographicBuffer.CreateFromByteArray(cData);
        byte[] decryptedData;

        // Setup an AES key, using AES in CBC mode and applying PKCS#7 padding on the input
        SymmetricKeyAlgorithmProvider aesProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesEcbPkcs7);
        CryptographicKey aesKeySymm = aesProvider.CreateSymmetricKey(keyBuffer);


        // Decrypt the data and convert it to byte array

        // EXCEPTION ON THIS LINE: "The supplied user buffer is not valid for the requested operation."
        IBuffer decrypted = CryptographicEngine.Decrypt(aesKeySymm, plainText, null);
        CryptographicBuffer.CopyToByteArray(decrypted, out decryptedData);
        return decryptedData;

Answer 1

CBC 需要一个 IV(也是一个 IBuffer 用于 CryptographicEngine.encrypt 和 CryptographicEngine.decrypt，所以你不能提供 null 。这只是为 decrypt 函数引用的 encrypt function 写下的。