VB.Net by API/System.Security.Cryptography/DESCryptoServiceProvider

DESCryptoServiceProvider.CreateDecryptor

  
 
Imports System.Security
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Public Class Tester
    Public Shared Sub Main
        Try
            Dim myDESProvider As DESCryptoServiceProvider = New DESCryptoServiceProvider()
            myDESProvider.Key = ASCIIEncoding.ASCII.GetBytes("12345678")
            myDESProvider.IV = ASCIIEncoding.ASCII.GetBytes("12345678")
            Dim DecryptedFile As FileStream = New FileStream("testDes.txt", FileMode.Open, FileAccess.Read)
            Dim myICryptoTransform As ICryptoTransform = myDESProvider.CreateDecryptor(myDESProvider.Key, myDESProvider.IV)
            Dim myCryptoStream As CryptoStream = New CryptoStream(DecryptedFile, myICryptoTransform, CryptoStreamMode.Read)
            Dim myDecStreamReader As New StreamReader(myCryptoStream)
            Dim myDecStreamWriter As New StreamWriter("test.txt")
            myDecStreamWriter.Write(myDecStreamReader.ReadToEnd())
            myCryptoStream.Close()
            myDecStreamReader.Close()
            myDecStreamWriter.Close()
        Catch ex As Exception
            Console.WriteLine(ex.ToString())
        End Try
    End Sub
End Class

DESCryptoServiceProvider.CreateEncryptor

  
 
Imports System.Security
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Public Class Tester
    Public Shared Sub Main
        Try
            Dim myDESProvider As DESCryptoServiceProvider = New DESCryptoServiceProvider()
            myDESProvider.Key = ASCIIEncoding.ASCII.GetBytes("12345678")
            myDESProvider.IV = ASCIIEncoding.ASCII.GetBytes("12345678")
            Dim myICryptoTransform As ICryptoTransform = myDESProvider.CreateEncryptor(myDESProvider.Key, myDESProvider.IV)
            Dim ProcessFileStream As FileStream = New FileStream("test.txt", FileMode.Open, FileAccess.Read)
            Dim ResultFileStream As FileStream = New FileStream("testDes.txt", FileMode.Create, FileAccess.Write)
            Dim myCryptoStream As CryptoStream = New CryptoStream(ResultFileStream, myICryptoTransform, CryptoStreamMode.Write)
            Dim bytearrayinput(ProcessFileStream.Length - 1) As Byte
            ProcessFileStream.Read(bytearrayinput, 0, bytearrayinput.Length)
            myCryptoStream.Write(bytearrayinput, 0, bytearrayinput.Length)
            myCryptoStream.Close()
            ProcessFileStream.Close()
            ResultFileStream.Close()
        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try
    End Sub
End Class

DESCryptoServiceProvider.CreateEncryptor().TransformFinalBlock

  
Imports System.Security.Cryptography
Imports System.Text.ASCIIEncoding
Imports System.IO

Public Class Tester
    Public Shared Sub Main
            "Dim str As String = "1234567890asdfgh"
            "must be exactly 16 characters long
            Dim sSource, sKey, sIV, sResult As String
            sSource = "string"
            Dim objDES As New DESCryptoServiceProvider()
            Dim objStream As New MemoryStream(ASCII.GetBytes(sSource), False)
            sKey = "12345678"
            sIV = "12345678"
            objDES.IV = ASCII.GetBytes(sIV)
            objDES.Key = ASCII.GetBytes(sKey)
            sResult = ASCII.GetChars(objDES.CreateEncryptor().TransformFinalBlock(ASCII.GetBytes(sSource), 0, sSource.Length))
            Console.WriteLine(sResult)
            "sResult = ASCII.GetChars(objDES.CreateDecryptor().TransformFinalBlock(ASCII.GetBytes(sSource), 0, sSource.Length))
            "Console.WriteLine(sResult)
    
    End Sub
End Class