Question

当我尝试打开它时，我遇到了这个糟糕的数据问题。知道怎么解决吗？我调试时显示CryptoStream.FlushFinalBlock()出现问题。请参阅以下代码。

Public Class Encryption
  Public Function Encrypt(ByVal plainText As String) As Byte()

    Dim utf8encoder As UTF8Encoding = New UTF8Encoding()
    Dim inputInBytes() As Byte = utf8encoder.GetBytes(plainText)


    Dim tdesProvider As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider()

    ' The ICryptTransform interface uses the TripleDES 
    ' crypt provider along with encryption key and init vector 
    ' information 
    Dim cryptoTransform As ICryptoTransform = tdesProvider.CreateEncryptor(Me.key, Me.iv)


    Dim encryptedStream As MemoryStream = New MemoryStream()
    Dim cryptStream As CryptoStream = New CryptoStream(encryptedStream, cryptoTransform, CryptoStreamMode.Write)


    cryptStream.Write(inputInBytes, 0, inputInBytes.Length)
    cryptStream.FlushFinalBlock()
    encryptedStream.Position = 0

    Dim result(encryptedStream.Length - 1) As Byte
    encryptedStream.Read(result, 0, encryptedStream.Length)
    cryptStream.Close()
    Return result
  End Function

  Public Function Decrypt(ByVal inputInBytes() As Byte) As String 
    ' UTFEncoding is used to transform the decrypted Byte Array 
    ' information back into a string. 
    Dim utf8encoder As UTF8Encoding = New UTF8Encoding() 
    Dim tdesProvider As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider()

    ' As before we must provide the encryption/decryption key along with 
    ' the init vector. 
    Dim cryptoTransform As ICryptoTransform = tdesProvider.CreateDecryptor(Me.key, Me.iv)

    ' Provide a memory stream to decrypt information into 
    Dim decryptedStream As MemoryStream = New MemoryStream()
    Dim cryptStream As CryptoStream = New CryptoStream(decryptedStream, cryptoTransform, CryptoStreamMode.Write)
    cryptStream.Write(inputInBytes, 0, inputInBytes.Length)
    cryptStream.FlushFinalBlock()
    decryptedStream.Position = 0

    ' Read the memory stream and convert it back into a string 
    Dim result(decryptedStream.Length - 1) As Byte
    decryptedStream.Read(result, 0, decryptedStream.Length)
    cryptStream.Close()
    Dim myutf As UTF8Encoding = New UTF8Encoding()
    Return myutf.GetString(result)
  End Function
End Class

Answer 1

在cryptStream.Write之后，您可以关闭它并返回MemoryStream数据

Public Function Encrypt(ByVal plainText As String) As Byte()

    Dim utf8encoder As UTF8Encoding = New UTF8Encoding()
    Dim inputInBytes() As Byte = utf8encoder.GetBytes(plainText)


    Dim tdesProvider As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider()

    ' The ICryptTransform interface uses the TripleDES 
    ' crypt provider along with encryption key and init vector 
    ' information 
    Dim cryptoTransform As ICryptoTransform = tdesProvider.CreateEncryptor(Me.key, Me.iv)


    Dim encryptedStream As MemoryStream = New MemoryStream()
    Dim cryptStream As CryptoStream = New CryptoStream(encryptedStream, cryptoTransform, CryptoStreamMode.Write)

    cryptStream.Write(inputInBytes, 0, inputInBytes.Length)
    cryptStream.Close()
    encryptedStream.Position = 0

    Return encryptedStream.ToArray()
End Function

更新：解密方法

Public Function Decrypt(ByVal inputInBytes() As Byte) As String 
    Dim tdesProvider As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider()

    ' As before we must provide the encryption/decryption key along with 
    ' the init vector. 
    Dim cryptoTransform As ICryptoTransform = tdesProvider.CreateDecryptor(Me.key, Me.iv)

    ' Provide a memory stream to decrypt information into 
    Dim decryptedStream As MemoryStream = New MemoryStream()
    Dim cryptStream As CryptoStream = New CryptoStream(decryptedStream, cryptoTransform, CryptoStreamMode.Write)
    cryptStream.Write(inputInBytes, 0, inputInBytes.Length)
    cryptStream.FlushFinalBlock()

    Return System.Text.Encoding.Unicode.GetString(decryptedStream.ToArray)
End Function

Answer 2

Public Function Decrypt（ByVal inputInBytes（）As Byte）As String 'UTFEncoding用于转换解密的字节数组 '信息回到一个字符串。 Dim utf8encoder作为UTF8Encoding =新的UTF8Encoding（） Dim tdesProvider As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider（）

    ' As before we must provide the encryption/decryption key along with 
    ' the init vector. 
    Dim cryptoTransform As ICryptoTransform = tdesProvider.CreateDecryptor(Me.key, Me.iv)

    ' Provide a memory stream to decrypt information into 
    Dim decryptedStream As MemoryStream = New MemoryStream()
    Dim cryptStream As CryptoStream = New CryptoStream(decryptedStream, cryptoTransform, CryptoStreamMode.Write)
    cryptStream.Write(inputInBytes, 0, inputInBytes.Length)
    cryptStream.FlushFinalBlock()
    decryptedStream.Position = 0

    ' Read the memory stream and convert it back into a string 
    Dim result(decryptedStream.Length - 1) As Byte
    decryptedStream.Read(result, 0, decryptedStream.Length)
    cryptStream.Close()
    Dim myutf As UTF8Encoding = New UTF8Encoding()
    Return myutf.GetString(result)
End Function

结束班

System.Security.Cryptography.CryptographicException：错误数据

2 个答案: