ConnectionString encryption decryption
From: Jase H (JaseH_at_discussions.microsoft.com)
Date: 03/17/05
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Date: Wed, 16 Mar 2005 18:19:02 -0800
Hello,
I have a ASP.NET web application problem involving the data encryption and
decryption assembly(DLL) used on the connection string value that is set in
the webconfig file.
The problem occurs in the application when you instantiate a new instance of
the class as shown below:
---Dim dp As DPAPIComp.DataProtectorComp = New DPAPIComp.DataProtectorComp---
where DPAPIComp is the name of the namespace referenced to in the library
and DataProtectorComp is the class. This class contains the Encrypt and
Decrypt function used to encrypt and decrypt the connection string pass to
it.
Below is the code responsing to the call above. (in the form of an assembly)
using System;
using System.EnterpriseServices;
using System.Security.Principal;
using System.Runtime.InteropServices;
using DataProtection;
namespace DPAPIComp
{
public class DataProtectorComp: ServicedComponent
{
public byte[] Encrypt(byte[] plainText)
{
DataProtector dp = new DataProtector( DataProtector.Store.USE_USER_STORE );
byte[] cipherText = null;
try
{
cipherText = dp.Encrypt(plainText, null);
}
catch(Exception ex)
{
throw new Exception("Exception encrypting. " + ex.Message);
}
return cipherText;
}
public byte[] Decrypt(byte[] cipherText)
{
DataProtector dp = new DataProtector( DataProtector.Store.USE_USER_STORE );
byte[] plainText = null;
try
{
plainText = dp.Decrypt(cipherText,null);
}
catch(Exception ex)
{
throw new Exception("Exception decrypting. " + ex.Message);
}
return plainText;
}
public DataProtectorComp()
{
}
}
}
--------------------------------------------
The error message as it passes this line in the debugger is "Access is
denied".
Source: "mscorlib"
StackTrace: " at
System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode,
IntPtr errorInfo)
at System.EnterpriseServices.Thunk.Proxy.CoCreateObject(Type serverType,
Boolean bQuerySCInfo, Boolean& bIsAnotherProcess, String& uri)
at
System.EnterpriseServices.ServicedComponentProxyAttribute.CreateInstance(Type
serverType)
at
System.Runtime.Remoting.Activation.ActivationServices.IsCurrentContextOK(Type
serverType, Object[] props, Boolean bNewObj)
at BoardroomBookings.DBConnection.GetConnectionString(String Name,
String& CnnStr) in C:\Inetpub\wwwroot\BoardroomBookings\DBConnection.vb:line
14" String
--------------------------------------------
I have tried placing the DLL in the GAC and giving it a strong name and that
still give the same error message. The DPAPI solution was built successfully.
Would this indicate that there is some sort of permission being applied to
the encryption/decryption call because I cannot connect to the server.
How do I get it to instantiate this probably and be able to connect to the
database.
Cheers,
Please note the same version works on the server but does not work on my
local workstation. Does this tell you something?
- Next message: Michael: "using LSET to load records into types in VB6 - how to do in .NET"
- Previous message: GoofyIdiot: "How to implement a three layered serivces application"
- Next in thread: Niroo TP: "RE: ConnectionString encryption decryption"
- Reply: Niroo TP: "RE: ConnectionString encryption decryption"
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