Rijndael解密返回奇怪的輸出

Question

我已經使用Rijndael算法進行加密和解密。

解密工作正常，當我用加密做。

但是，當我嘗試做解密獨自返回這樣的事情

JM「ec4ħdB̵Dq沃頓。

而且我已經使用了兩個按鈕，一個用於加密，另一個用於解密，並在點擊按鈕時調用方法。

我無法理解爲什麼輸出如此返回。即使我使用了相同的轉換（UTF8編碼）兩種方法。

請幫我解決這個問題。

下面是我的代碼：

public partial class Form1 : Form 
{ 
    private RijndaelManaged myRijndael = new RijndaelManaged(); 
    private int iterations; 
    private byte [] salt; 

    public Form1(string strPassword) 
    { 
     myRijndael.BlockSize = 128; 
     myRijndael.KeySize = 128; 
     myRijndael.IV = HexStringToByteArray("e84ad660c4721ae0e84ad660c4721ae0"); 

     myRijndael.Padding = PaddingMode.PKCS7; 
     myRijndael.Mode = CipherMode.CBC; 
     iterations = 1000; 
     salt = System.Text.Encoding.UTF8.GetBytes("cryptography123example"); 
     myRijndael.Key = GenerateKey(strPassword); 
    } 

    public string Encrypt(string strPlainText) 
    { 
     byte[] strText = new System.Text.UTF8Encoding().GetBytes(strPlainText); 
     MemoryStream ms = new MemoryStream(); 
     ICryptoTransform transform = myRijndael.CreateEncryptor(); 
     CryptoStream cs = new CryptoStream(ms, transform, CryptoStreamMode.Write); 
     cs.Write(strText, 0, strText.Length); 

     cs.FlushFinalBlock(); 
     return Convert.ToBase64String(ms.ToArray()); 
    } 

    public string Decrypt(string encryptedText) 
    { 
     var encryptedBytes = Convert.FromBase64String(encryptedText); 
     MemoryStream ms = new MemoryStream(); 
     ICryptoTransform transform = myRijndael.CreateDecryptor(); 
     CryptoStream cs = new CryptoStream(ms, transform, CryptoStreamMode.Write); 
     cs.Write(encryptedBytes, 0, encryptedBytes.Length); 

     return System.Text.Encoding.UTF8.GetString(ms.ToArray()); 
    } 

    public static byte[] HexStringToByteArray(string strHex) 
    { 
     dynamic r = new byte[strHex.Length/2]; 
     for (int i = 0; i <= strHex.Length - 1; i += 2) 
     { 
      r[i/2] = Convert.ToByte(Convert.ToInt32(strHex.Substring(i, 2), 16)); 
     } 
     return r; 
    } 

    private byte[] GenerateKey(string strPassword) 
    { 
     Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(System.Text.Encoding.UTF8.GetBytes(strPassword), salt, iterations); 
     return rfc2898.GetBytes(128/8); 
    } 

    private void button1_Click(object sender, EventArgs e) 
    { 
     EncryptOutput.Text = Encrypt(EncryptInput.Text); 
    } 

    private void button2_Click(object sender, EventArgs e) 
    { 
     DecryptOutput.Text = Decrypt(DecryptInput.Text); 
    } 
} 

Answer 1

cs.FlushFinalBlock（）;遺忘在Decrypt（）？我只是往返式操作測試字符串與您的代碼，一旦我固定的

Answer 2

試試這個代碼：

public string Encrypt(string strPlainText) { 
    byte[] strText = System.Text.Encoding.UTF8.GetBytes(strPlainText); 

    using (ICryptoTransform encryptor = myRijndael.CreateEncryptor()) 
    using (MemoryStream input = new MemoryStream(strText)) 
    using (MemoryStream output = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(output, encryptor, CryptoStreamMode.Write)) { 
     input.CopyTo(cs); 
     cs.FlushFinalBlock(); 
     return Convert.ToBase64String(output.GetBuffer(), 0, (int)output.Length); 
    } 
} 

public string Decrypt(string encryptedText) { 
    byte[] encryptedBytes = Convert.FromBase64String(encryptedText); 

    using (ICryptoTransform decryptor = myRijndael.CreateDecryptor()) 
    using (MemoryStream input = new MemoryStream(encryptedBytes)) 
    using (MemoryStream output = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(input, decryptor, CryptoStreamMode.Read)) { 
     cs.CopyTo(output); 
     return System.Text.Encoding.UTF8.GetString(output.GetBuffer(), 0, (int)output.Length); 
    } 
} 

public static byte[] HexStringToByteArray(string strHex) { 
    var r = new byte[strHex.Length/2]; 

    for (int i = 0; i < strHex.Length; i += 2) { 
     r[i/2] = byte.Parse(strHex.Substring(i, 2), NumberStyles.HexNumber); 
    } 
    return r; 
} 

請記得使用using模式......而dynamic應該只在非常特殊的情況下使用。

注意，Encrypt是可行的少了一個Stream，在一個非常相似的方式給你寫了一句：

public string Encrypt(string strPlainText) { 
    byte[] strText = System.Text.Encoding.UTF8.GetBytes(strPlainText); 

    using (ICryptoTransform encryptor = myRijndael.CreateEncryptor()) 
    using (MemoryStream output = new MemoryStream()) 
    using (CryptoStream cs = new CryptoStream(output, encryptor, CryptoStreamMode.Write)) { 
     cs.Write(strText, 0, strText.Length); 
     cs.FlushFinalBlock(); 
     return Convert.ToBase64String(output.GetBuffer(), 0, (int)output.Length); 
    } 
} 

但Decrypt需要兩個Stream，因爲CryptoStream需要Stream作爲參數，其中包含加密的數據，並且更容易將其輸出（其中您不知道確切的長度，由於填充）寫入另一個流。