Decrypt The.spenc file using VB or C#

Question

Hi,
I have one encrypted file with extension .spenc. It comes with decryption key. I would like to decrypt it by using that key in SSIS. I suppose I have to do using Script component. How can I do that using Script Component.
Any Idea?
Regards,
Mustafa
MH

Answer 1

Hi Arthur,
Thanks for your reply. I have managed to get this one by getting some help on MSDN but It is not going to the CrptoReader Class not sure Why? Am I missing something? I have debugged and getting the values in the variables from SSIS.
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime
Imports System.IO
Imports System.Object
Imports System.Security.Cryptography
Imports System.IO.Compression
<System.AddIn.AddIn("ScriptMain", Version:="1.0", Publisher:="", Description:="")> _
<System.CLSCompliantAttribute(False)> _
Partial Public Class ScriptMain
Inherits Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
Enum ScriptResults
Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success
Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
End Enum
Public Sub Main()
' Add your code here
Dim inputFile As String
Dim outputFile As String
Dim encoding As String
Dim PrivateKeyInXML As String
'Mapping variables from SSIS
inputFile = Dts.Variables("Item1Path").Value.ToString()
outputFile = Dts.Variables("OutputFile").Value.ToString()
encoding = Dts.Variables("Encoding").Value.ToString()
PrivateKeyInXML = Dts.Variables("PrivateKey").Value.ToString()
Dts.TaskResult = ScriptResults.Success
End Sub
Public Class CryptoReader
Private _FileStream As FileStream
Private _CryptoStream As CryptoStream
Private _ZipStream As GZipStream
Private _RSAPrivateKeyinXML As String
Dim _CryptoAgent As New System.Security.Cryptography.AesCryptoServiceProvider
Sub New(ByVal inputFile As String, ByVal outputFile As String, ByVal encoding As System.Text.Encoding, ByVal PrivateKeyInXML As String)
_RSAPrivateKeyinXML = PrivateKeyInXML
'Create the crypto agent
_CryptoAgent = AesCryptoServiceProvider.Create
'Open cypher text for reading in
_FileStream = New FileStream(inputFile, FileMode.Open)
ReadHeaderFromFile() 'write out aes key to header
'Create the stream to decrypt the AES part of the file
_CryptoStream = New CryptoStream(_FileStream, _CryptoAgent.CreateDecryptor, CryptoStreamMode.Read)
_ZipStream = New GZipStream(_CryptoStream, CompressionMode.Decompress)
'setup complete - run decrypt to unprotect the rest of the file
DecryptFile(outputFile)
Flush()
Close()
Dispose()
End Sub
Public Sub Close()
_CryptoStream.Close()
_ZipStream.Close()
_FileStream.Close()
End Sub
Public Sub Dispose()
_CryptoStream.Dispose()
_ZipStream.Dispose()
_FileStream.Dispose()
End Sub
MH