C# UWP CryptographicEngine.Encrypt() returns 空

Question

我试图将输入字节 [] 加密为 AES，但最终加密缓冲区为空。

private byte[] Encrypt(byte[] data)
{
    byte[] secretKey = new byte[] { 1, 2, 3 };

    IBuffer key = Convert.FromBase64String(Convert.ToBase64String(secretKey.ToArray()).ToString()).AsBuffer();
    Debug.WriteLine(key.Length);
    SymmetricKeyAlgorithmProvider algorithmProvider = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.AesCbc);
    CryptographicKey cryptographicKey = algorithmProvider.CreateSymmetricKey(key);
    IBuffer bufferEncrypt = CryptographicEngine.Encrypt(cryptographicKey, data.AsBuffer(), null);

    return bufferEncrypt.ToArray();
}

调试器将局部变量显示为（名称、值、类型）：

+       this    {Project.Auth}  Project.Auth
+       data    {byte[15]}  byte[]
    bufferEncrypt   null    Windows.Storage.Streams.IBuffer
+       cryptographicKey    {Windows.Security.Cryptography.Core.CryptographicKey}   Windows.Security.Cryptography.Core.CryptographicKey
+       key {System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeBuffer}    Windows.Storage.Streams.IBuffer {System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeBuffer}
+       algorithmProvider   {Windows.Security.Cryptography.Core.SymmetricKeyAlgorithmProvider}  Windows.Security.Cryptography.Core.SymmetricKeyAlgorithmProvider
+       SecretKey   Count = 16  System.Collections.Generic.List<byte>

我错在哪里？

Answer 1

我什至不能运行你的代码片段在我这边成功，当 CreateSymmetricKey(key) 时会抛出异常 System.ArgumentException: 'Value does not fall within the expected range.。您的密钥似乎长度不对，密钥长度应根据您需要的安全性设置一定的位数。（AES 的 256 位很常见）。

此外，CBC 算法需要一个初始化向量，您可以为该向量分配一个随机数。更多细节请参考对称密钥 .

请尝试解决您的问题并按照 official sample or this example 实施加密功能。

C# UWP CryptographicEngine.Encrypt() returns 空

C# UWP CryptographicEngine.Encrypt() returns null

c#

encryption

aes

encryption-symmetric

uwp