AES 字符串加密/解密字符间隔

Question

我正在使用 AES 加密然后解密字符串。但我的输出看起来是这样的：

Original text >> HI WORLD  
Decrypted text >> H I   W O R L D

我尝试了很多代码，但没有发现问题。

这里的问题出在哪里呢？

class Program
{
    public static void Main(string[] args)
    {
        byte[] aesKey = Cryptography.GenerateAes128Key();
        Console.WriteLine("AES key >> " + aesKey.Length);
        string originalText = "HI WORLD";
        byte[] myMess = ASCIIEncoding.Unicode.GetBytes(originalText);
        Console.WriteLine("Original text >> " + ASCIIEncoding.Unicode.GetString(myMess));
        byte[] myEcnryptedMess = Cryptography.Encrypt(myMess, aesKey);
        Console.WriteLine("Encrypted text >> " + ASCIIEncoding.Unicode.GetString(myEcnryptedMess));
        Console.WriteLine("Decrypted text >> " + Cryptography.Decrypt(myEcnryptedMess, aesKey));
        Console.WriteLine("Press any key to continue . . . ");
        Console.ReadKey(true);
    }

    public static byte[] Encrypt(byte[] plainTextBytes, byte[] Key)
    {
        byte[] iv = new byte[Key.Length];
        Aes myAes = Aes.Create();
        ICryptoTransform encryptor = myAes.CreateEncryptor(Key, iv);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
        cryptoStream.FlushFinalBlock();
        byte[] cipherTextBytes = memoryStream.ToArray();
        // Close both streams.
        memoryStream.Close();
        cryptoStream.Close();
        return cipherTextBytes;
    }

    public static string Decrypt(byte[] cipherTextBytes, byte[] Key)
    {
        byte[] iv = new byte[Key.Length];
        Aes myAes = Aes.Create();
        ICryptoTransform decryptor = myAes.CreateDecryptor(Key, iv);
        MemoryStream  memoryStream = new MemoryStream(cipherTextBytes);
        CryptoStream  cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
        byte[] plainTextBytes = new byte[cipherTextBytes.Length];
        // Start decrypting.
        int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
        // Close both streams.
        memoryStream.Close();
        cryptoStream.Close();
        // Convert decrypted data into a string.
        // Let us assume that the original plaintext string was UTF8-encoded.
        string plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
        // Return decrypted string.
        return plainText;
    }
}

Answer 1

您对 GetBytes 和 GetString: 使用不同的编码，

ASCIIEncoding.Unicode.GetBytes(originalText);

然后

Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount)

尝试对这两项操作使用相同的编码。

克里斯

Answer 2

你的字符串编码弄乱了。 ASCIIEncoding.Unicode 基本上是无稽之谈。 （实际上，它与 Encoding.Unicode 相同，但编写方式具有误导性。）

您想使用哪种编码？ UTF-16、UTF-8 还是 ASCII？根据选择，使用 Encoding.Unicode、Encoding.UTF8 或 Encoding.ASCII，并坚持使用。我认为 UTF-8 是最好的选择，因此，使用这个：

// ...
string originalText = "HI WORLD";
byte[] myMess = Encoding.UTF8.GetBytes(originalText);
Console.WriteLine("Original text >> " + Encoding.UTF8.GetString(myMess));
byte[] myEcnryptedMess = Cryptography.Encrypt(myMess, aesKey);
Console.WriteLine("Encrypted text >> " + Encoding.UTF8.GetString(myEcnryptedMess));
Console.WriteLine("Decrypted text >> " + Cryptography.Decrypt(myEcnryptedMess, aesKey));