Rijndael管理:明文长度检测 [英] Rijndael managed: plaintext length detction
问题描述
我花了一些时间来学习如何在.NET中使用RijndaelManaged库,并开发了以下功能来测试对文本的加密,并对该MSDN库进行了一些修改:
I am spending some time learning how to use the RijndaelManaged library in .NET, and developed the following function to test encrypting text with slight modifications from the MSDN library:
Function encryptBytesToBytes_AES(ByVal plainText As Byte(), ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
' Check arguments.
If plainText Is Nothing OrElse plainText.Length <= 0 Then
Throw New ArgumentNullException("plainText")
End If
If Key Is Nothing OrElse Key.Length <= 0 Then
Throw New ArgumentNullException("Key")
End If
If IV Is Nothing OrElse IV.Length <= 0 Then
Throw New ArgumentNullException("IV")
End If
' Declare the RijndaelManaged object
' used to encrypt the data.
Dim aesAlg As RijndaelManaged = Nothing
' Declare the stream used to encrypt to an in memory
' array of bytes.
Dim msEncrypt As MemoryStream = Nothing
Try
' Create a RijndaelManaged object
' with the specified key and IV.
aesAlg = New RijndaelManaged()
aesAlg.BlockSize = 128
aesAlg.KeySize = 128
aesAlg.Mode = CipherMode.ECB
aesAlg.Padding = PaddingMode.None
aesAlg.Key = Key
aesAlg.IV = IV
' Create a decrytor to perform the stream transform.
Dim encryptor As ICryptoTransform = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV)
' Create the streams used for encryption.
msEncrypt = New MemoryStream()
Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
Using swEncrypt As New StreamWriter(csEncrypt)
'Write all data to the stream.
swEncrypt.Write(plainText)
End Using
End Using
Finally
' Clear the RijndaelManaged object.
If Not (aesAlg Is Nothing) Then
aesAlg.Clear()
End If
End Try
' Return the encrypted bytes from the memory stream.
Return msEncrypt.ToArray()
End Function
这是我用以下命令调用cryptoBytesToBytes_AES()的实际代码:
Here's the actual code I am calling encryptBytesToBytes_AES() with:
Private Sub btnEncrypt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEncrypt.Click
Dim bZeroKey As Byte() = {&H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0, &H0}
PrintBytesToRTF(encryptBytesToBytes_AES(bZeroKey, bZeroKey, bZeroKey))
End Sub
但是,我在swEncrypt.Write(plainText)
上抛出了一个异常,指出要加密的数据长度无效".
However, I get an exception thrown on swEncrypt.Write(plainText)
stating that the 'Length of the data to encrypt is invalid.'
但是,我知道密钥,iv和纯文本的大小为16个字节== 128位== aesAlg.BlockSize. 为什么会引发此异常?,是因为StreamWriter试图创建一个String(表面上使用某种编码),并且它不喜欢& H0作为值吗?
However, I know that the size of my key, iv, and plaintext are 16 bytes == 128 bits == aesAlg.BlockSize. Why is it throwing this exception? Is it because the StreamWriter is trying to make a String (ostensibly with some encoding) and it doesn't like &H0 as a value?
我认为除了使用StreamWriter之外,我还需要想出一种加密字节数组的新方法. MSDN页面上的雄鹿显示这将首先执行某种字符串转换,这是我不想要的.有什么想法吗?
I think I need to come up with a new way to encrypt the byte array, other than using the StreamWriter. A gander on the MSDN page shows that this will do some sort of string conversion first, which I don't want. Any ideas?
推荐答案
在这种情况下,您不能也不需要使用StreamWriter.
StreamWriter不接受Byte()作为参数.
You cannot and don't need to use a StreamWriter in this case.
StreamWriter doesn't accept Byte() as an argument.
您可以将加密功能修改为以下内容:
You can modify your encryption function to the following:
Function encryptBytesToBytes_AES(ByVal plainText As Byte(), ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
' Check arguments.'
If plainText Is Nothing OrElse plainText.Length <= 0 Then
Throw New ArgumentNullException("plainText")
End If
If Key Is Nothing OrElse Key.Length <= 0 Then
Throw New ArgumentNullException("Key")
End If
If IV Is Nothing OrElse IV.Length <= 0 Then
Throw New ArgumentNullException("IV")
End If
' Declare the RijndaelManaged object'
' used to encrypt the data.'
Dim aesAlg As RijndaelManaged = Nothing
Dim encryptedData As Byte()
Try
' Create a RijndaelManaged object'
' with the specified key and IV.'
aesAlg = New RijndaelManaged()
aesAlg.BlockSize = 128
aesAlg.KeySize = 128
aesAlg.Mode = CipherMode.ECB
aesAlg.Padding = PaddingMode.None
aesAlg.Key = Key
aesAlg.IV = IV
' Create a decrytor to perform the stream transform.'
Dim encryptor As ICryptoTransform = aesAlg.CreateEncryptor()
' Create the streams used for encryption.'
Using msEncrypt As New MemoryStream()
Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
csEncrypt.Write(plainText, 0, plainText.Length)
csEncrypt.FlushFinalBlock()
End Using
encryptedData = msEncrypt.ToArray()
End Using
Finally
' Clear the RijndaelManaged object.'
If Not (aesAlg Is Nothing) Then
aesAlg.Clear()
End If
End Try
' Return the encrypted bytes from the memory stream.'
Return encryptedData
End Function
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