Security :: Decrypting Using X509 Certificates?

Mar 16, 2011

I am trying to decrypt using an X509 certificate private key. I am using the following function:

[Code]....

Similar Messages:

Security :: Encrypting With An X509 Certificate.

Mar 14, 2011

I have created an x590 certificate that is in the file :
"C:UsersmartinAppDataRoamingMicrosoftSystemCertificatesMyCertificates"

I am trying to acces the public key to encrypt some plain text.

The system is throwing an "System.ArgumentOutOfRangeException" at the line

Dim certificate As X509Certificate2 = certificateCollection(0)

Can anyone tell me where I am going wrong or tell me another way to access the public key

.................................................
This is the complete code:
Imports System.Security
Imports System.Security.Cryptography.X509Certificates
Imports System.Security.Cryptography.X509Certificates.X509Certificate2
Imports System.Security.Cryptography.Pkcs
Partial Class encryptwithcertificare
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim encoding As UTF8Encoding = New UTF8Encoding
Dim cleartext As String = Textbox1.Text
Dim myStore As X509Store = New X509Store()
myStore.Open(OpenFlags.ReadOnly)
Dim certificateCollection As X509Certificate2Collection = myStore.Certificates.Find(X509FindType.FindBySubjectName, "bobby", True)
Dim certificate As X509Certificate2 = certificateCollection(0)
Dim code() As Byte = EncryptwithCertificate(cleartext, certificate)
Label1.Text = Convert.ToBase64String(code)
End Sub
Shared Function EncryptwithCertificate(ByVal cleartext As Byte, ByVal certificate As X509Certificate2) As Byte()
Dim encoding As UTF8Encoding = New UTF8Encoding
Dim cleartextsbyte() As Byte = encoding.GetBytes(cleartext)
Dim contentinfo As ContentInfo = New ContentInfo(cleartextsbyte)
Dim envelopedCms As EnvelopedCms = New EnvelopedCms(contentinfo)
Dim recipient As CmsRecipient = New CmsRecipient(certificate)
envelopedCms.Encrypt(recipient)
Return envelopedCms.Encode()
End Function
End Class

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Security :: Using A X509 Certificate In A Web-service

Jun 17, 2010

I have a rather strange situation that I am in.

I have to write a web-service that will (among other things) communicate with another web service. When we communicate with that remote web-service we are required to use a certificate that they provided.

I am having a really hard time trying to find any sample code that does this.

I have found code for installing certs when you want to use a browser to communicate, but none when you are using a web-service to web-service and you are required to HAVE the certificate, not requiring the OTHER end to have the certificate.

So far I cannot even find code to allow me to parse throught the cert store. Samples I found online show up as errors in Visual Studio 2005.

Note: This is running one Windows 2000, designed with Visual Studio 2005, asp.net 2.0

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Security :: Add CSP Information To X509 Certificate Programmatically

Mar 3, 2010

I'm working on a project for a large company that wants to create a crypto toolbox for cross-platform signing and encrypting and am constantly running into problems concerning the cryptographic abilities in the .Net framework. The blazing inferno that I need to put out this time is that SignedCms and EnvelopedCms don't seem to work with a Cryptographic Service Provider that doesn't store the private-key on the Windows machine. I'm working with a network HSM and certicates that have only a public key, that is, no private-key and no information in the store as to where that private-key resides or how you can access it (a RSA public/private key pair is created on the machine, using the HSM supplier's CSP, and a certificate signing request is generated and used to create a public-key certificate signed by the CA). Theoretically the private key gets picked up from the HSM (referenced actually) using the CspParameters given when instantiating the class, which specifies the CSP provided by the HSM supplier. Unfortunately, up to now this only works with CAPI, where can associate the cryptographic service provider with the signing certificate (usign CertSetCertificateContextProperty with CERT_KEY_PROV_HANDLE_PROP_ID). (We're using CAPI for PKCS#7 signing because the .Net framework only supports signatures up to SHA1 and we have a minimum of SHA256). Surprisingly enough CmsSigner accepts a CSP in it's constructor but it cannot get the key, it throws an exception during instantiation from method CreateDummyCertificate for some reason (with the message "Process completed." no less!??). I use the following CspParameters:

[Code]....

CmsSigner cmsSigner = new CmsSigner(cspParams);

This process works great with certificates and key pairs created by MakeCert. With MakeCert you can associate the CSP information with the Certificate upon creation (-sk, -sp, -sy). The private key still resides in the HSM but specifying the provider during the creation of the certificate seems to have persisted the CSP information somewhere, somehow. Exactly how that's done I don't know, but if could do that, my problem would be solved.

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Security :: X509 - Client Certificate Infrastructure

Sep 9, 2010

I dont have a lot of background with SSL and X509 configuration and support with my Asp.Net application, so I was wondering if someone can explain or point me in the right direction to MSDN or any other article or posting explaining if it's possible to do what I am looking to support in my environment.

I have IIS 6.0 with SSL (Verisign cert) as well as "Require client certificates" working against a local installation of Microsoft Certificate Services, https://<domain>/certsrv, where users can request and install client certs (both xp clients for basic
mode, and Vista/7 for advance mode).

Here's what I am up against:

I have a segment of users coming from a virtualized server environment where this environment does not store personal settings for more than 48 hours. It's not an internet cafe, but rather an actual business where their IT staff uses server images to reimage each virtual server in the farm every 48hrs. Thus losing all users data in the "Current Users" Certificate Stores.

The IT staff give users a network folder share to store any personal items (docs, spreadsheets, links, etc.). The servers consist of Windows Server 2003, and will be migrating to Windows Server 2008 in the next 6-9 months.

These users have rights in Internet Explorer to navigate to my certsrv site and use activex to to request and install certificates then clode and reopen the broser to navigate and render the asp.net app.

Problem:

It's a pain to ask the users to request and have issued a client certificate every 48 hours.

The IT staff of this company has asked if I can create some sort of certificate that they can load in the "local computer" certificate store, NOT the "Current User" store, that will be made part of their base image for all their servers, and that this certificate is then used to properly authenticate all users on these servers to my IIS with "require client certificates" selected.

Question:

Is this possible, and if so what can I do on my side to create the proper certificate to give to the IT staff at this business to put into their servers "local computer" certificate store? I assume either under the Personal->Certificates store, or under the "Trusted Root Certification Authorities"->Certificates store. Thus allowing any user of these servers in their thin client virtual environment to open I.E., navigate to my site and select a certificate from the "Choose a digital certificate" popup that allows them to render my Asp.Net application, or avoids this popup altogether.

If this is the wrong forum to post in, please advise and I will move. Probably due to vernacular on my part, I have been unable to find any resources on here, MSDN or Bing to help me solve this problem.

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WCF / ASMX :: Web Service Security Using X509 Certificate

Nov 17, 2010

Am facing problem while consuming a java web service using WCF. below is the web.config and aspx.cs file details

Requirement

Service request and response will be encrypted with certificate. when i run this below code am getting the error "The private key is not present in the X.509 certificate."

<system.serviceModel>
<behaviors>
<endpointBehaviors>
<behavior name="TestClientCertificate">
<clientCredentials>
<clientCertificate storeLocation="CurrentUser" storeName="My"
findValue="certificatename" x509FindType="FindByIssuerName"/>
</clientCredentials>
</behavior>
</endpointBehaviors>
</behaviors>
<bindings>
<basicHttpBinding>
<binding name="TestHttpBinding" maxReceivedMessageSize="1048576" maxBufferSize="1048576" transferMode="Buffered">
<security mode="TransportWithMessageCredential">

<message clientCredentialType="Certificate"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint name="TestHttpPort" address="https://webserviceurl/webservice"
binding="basicHttpBinding" bindingConfiguration="TestHttpBinding"
behaviorConfiguration="TestClientCertificate"
contract="ServiceReference1.webService1">
</endpoint>
</client>
</system.serviceModel>

in page
protected void Page_Load(object sender, EventArgs e)
{
WebServiceClient abc = new WebServiceClient();
BindingElementCollection elements = abc.Endpoint.Binding.CreateBindingElements();
elements.Find<SecurityBindingElement>().IncludeTimestamp = true;
abc.Endpoint.Binding = new CustomBinding(elements);
WebServiceClientResponse xyz = abc.WebMethod("", "");
}
private static bool customXertificateValidation(object sender, X509Certificate cert, X509Chain chain, System.Net.Security.SslPolicyErrors error)
{
return true;
}
<system.serviceModel>
<behaviors>
<endpointBehaviors>
<behavior name="TestClientCertificate">
<clientCredentials>
<clientCertificate storeLocation="CurrentUser" storeName="My"
findValue="partnerservices" x509FindType="FindByIssuerName"/>
</clientCredentials>

</behavior>
</endpointBehaviors>
</behaviors>
<bindings>
<basicHttpBinding>
<binding name="TestHttpBinding" maxReceivedMessageSize="1048576" maxBufferSize="1048576" transferMode="Buffered">
<security mode="TransportWithMessageCredential">

<message clientCredentialType="Certificate"/>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint name="TestHttpPort" address="https://webservicespprd.biworldwide.com/partnerservices/services/v1/AccountWebService.biws"
binding="basicHttpBinding" bindingConfiguration="TestHttpBinding"
behaviorConfiguration="TestClientCertificate"
contract="ServiceReference1.AccountWebService">

</endpoint>
</client>
</system.serviceModel>

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Security :: How To Create Certificates For Login

Jun 20, 2010

I would like to do login to the website using certificates.

I want to have a secure login.

How to create certificates for login?

How certification process?

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Security :: Reading Certificates From The Browser?

Apr 9, 2010

Is it possible to read the certificate(s) in a clients browser through code? The situation I have is, someone is going to access my website with a certificate installed. In that certificate, there will be specific information related to my application. I will be pulling that specific peice of info out, and then doing what I need to with it.

I can already read certificates from my local machine (using the X509Certificate2 class), and using string manipulation, traverse out the information needed. The only part I can't do, is pull certificates from the browser.

I have tried using the '.IsPresent' function on an HttpClientCertificate object, but that always returns false (even though I have four certificates installed on my machine).

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Security :: Using Digital Certificates In Project?

Mar 29, 2011

Is anyone using digital certificates in project ?I have created a digital certificate using Microsoft certificate services.I have installed this certificate on my website.When I access website over https I get digital certificate error in browser.Most common cause for this error is incorrect date/time settings on client machine. This is not the issue in my case.

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Security :: View A Current Users X509 Certificate Store

Mar 15, 2011

Quick question: is it possible to retrive a users certificate store i.e. list all of the client's Personal Certificates?

Just to be clear, I am talking about the certificates installed on the clients machine, not the servers. I have managed to list the server's certificates, but so far have been unsuccesful with the above.

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Security :: Request A Client's X509 Cert W/o Windows Auth

Mar 15, 2010

Is it possible to request an X509 certificate from a client without configuring the application to use Windows Authentication? The purpose would be to press an asp.net button and "digitially sign" a web-form's contents. I do not need any login information, just the X509 cert.

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Security :: Encrypting And Decrypting Data

Aug 24, 2010

I have a webApplication in which i want to encrypt the data using Public key and whan it reach to the destination webapplication it will decrypted there with corresponding private key . Is there is any way to creating this pair of key?

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Security :: Encrypting And Decrypting Password?

Apr 22, 2010

I want to encrypt the password entered by the user....how do i go about it?is there any built-in function for it or will i be required to write a code for it?

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Security :: Decrypting A String Cripted In Php?

Jul 22, 2010

I have an external site developed in php that send me a string cripted with this php function:

const SALT = "chiave";
public static function myEncrypt($text)
{
return rawurlencode(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, self::SALT, $text, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}

and then I need to decrypt this in asp.net.

How can I do?

[Code]....

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Security :: Encrypting / Decrypting Data At Runtime

Feb 18, 2010

I have a problem hopefully someone out there will steer me in the right direction.

I have a web application that I am going to put on a standalone cd - currently the data is "Safe" because the database is in in the app folder and the code is located in the codebehind.

My problem is i'm putting this on a CD as a standalone site, anyone can access the database, or find the XML....

Is there a way to generate an encrypted Database / XML Page, that is complied with the CD, that the program can decrypt and access with a embedded key?

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Security :: Invoking Web Service / SOAP Request With Certificates Over SSL

Aug 2, 2010

I was wondering if it is possible to call a webservice or send a SOAP request using a provided certificate to encrypt my password (my identity) and use another to encrypt/sign a timestamp, service header, & soap body? Does anyone have any material or sample code where I can test encryption and security too? It doesn't have to be my own certificates, I just want to see it work and then I can possibly tailor it to my needs. After the SOAP request, there will be a provided response which I assume I will have to decrypt.

I found this thread, but it doesn't seem to use signatures or an SSL connection. Does VS 2010 have some extra features to help out on this? I believe the SOAP should look like this.

<soap:Envelope>
<soap:Header>
<svchdr:ServiceHeader>
<svchdr:StaticRegion>...</svchdr:StaticRegion>
<svchdr:DynamicRegion>...</svchdr:DynamicRegion>
</svchdr:ServiceHeader>
<wsse:Security>
(Signature Info)
</wsse:Security>
<soap:Body>
...
</soap:Body>
</soap:Envelope>

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Security :: Encrypting/Decrypting A Shared Password At Rest?

Dec 14, 2010

I received some code, a small c# asp.net application which manually posts a shared username/pwd to a 3rd party website for auto-logins from our intranet site. During transit the password is encrypted, but not within the application. Within this application a namevaluecollection is used and the username and password are hard coded. Originally the thought was, who cares if its hard coded because its shared between everyone anyway. Now we want to encrypt the username and password from within the application. I'm not sure the best way to accomplish the goal of making sure the password is encrypted "at rest". Normally I've seen passwords stored and encrypted within a database. I know we'll obviously have to move the password out of the application and store it somewhere else, I'm just not sure where. Do we move the username and pwd to the web.config file? I really am not sure the best way to approach this.

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Security :: Getting "Invalid Data" While DES-decrypting?

Mar 10, 2011

I'm trying a simple encryption procedure, encrypting/decrypting a HEX value. Encryption seems to work fine: result of encryption is "85772B6784BC1505". While trying to decrypt I get an "Invalid data"-exception.

CODE:

Dim x1 As UInt64 = DES.DES_EncryptCode("&H" & "0123456789ABCDEF")
Dim x2 As UInt64 = DES.DES_DecryptCode(x1)
Private Shared KEY_64() As Byte = {7, 6, 5, 4, 3, 2, 1, 0}
Private Shared IV_64() As Byte = {0, 1, 2, 3, 4, 5, 6, 7}

[Code]....

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C# - How Do I Find The Subjectdistinguishedname Of A X509 Certificate

Jul 12, 2010

I am trying to use the X509FindType.FindBySubjectDistinguishedName option and I am not sure where to find the value for the findValue property in my config.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.x509certificates.x509findtype.aspx

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C# - Can't Connect To HTTPS Using X509 Client Certificate

May 24, 2010

I'm new to cryptography and I'm a bit stuck:

I'm trying to connect (from my development environment) to a web service using HTTPS. The web service requires a client certificate - which I think I've installed correctly.

They have supplied me with a .PFX file. In Windows 7, I double clicked the file to install it into my Current User - Personal certificate store.

I then exported a X509 Base-64 encoded .cer file from the certificate entry in the store. It didn't have a private key associate with it.

Then, in my app, I'm attempting to connect to the service like this:

var certificate = X509Certificate.CreateFromCertFile("xyz.cer"));
var serviceUrl = "https://xyz";
var request = (HttpWebRequest) WebRequest.Create(serviceUrl);
request.ClientCertificates.Add(certificate);
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "application/x-www-form-urlencoded";

I get a 502 Connection failed when I connect.

Is there anything you can see wrong with this method? Our production environment seems to work with a similar configuration, but it's running Windows Server 2003.

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C# - How To Create Self Signed Certificates

Oct 1, 2010

I am trying to open my homepage with HTTPS in my test server. Is there a way i can create Self signed certifcates and see if https works. some links or any ideas with how to do Its an ASP.Net project and IIS V6.0

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Authenticating SQL Connection Using Certificates In .NET?

Jun 8, 2010

I've noticed that it is possible SQL Server 2005/2008 to authenticate replication accounts using certificates. Is it possible to authenticate .NET SqlConnection in the same manor?

Ideally, I'd like to do away with password authentication completely and have the aspnet user connect using a certificate stored against its account.

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Encrypting/decrypting Cookies In .NET 2.0 (C#)

Apr 4, 2011

would please someone guide me how to encrypt and decrypt cookies in Asp.net 2.0.

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C# - Can Use Digital Certificates With SilverLight Webpages

Sep 3, 2010

I am fairly new to web development and have never used Digital Certificates before. I assume using a digital certificate on a silverlight web page is the same as using one on any other web page, but i thought i should check. There are a few example of digitally signing the .xap file on the internet, would it then be a case of simply buying the certificate (from verisign or somewhere similar) and distributing it to customers?

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Error In C# Encrypt Code When Decrypting?

Mar 31, 2011

A bit more background info as suggested:I'm finsihing of an Intranet CMS web app where I have to use the products API (ASP.NET based). Because of time constraints and issues with Windows authen' I need another way to ensure staff do not need to re login everytime they visit the site to view personalised content. The way it works is that once a user logs in (username/password), a Session ID storing a new different Security context value is generated that is used to display the personalised content. The API login method called uses the username and password as parameters. The only way I can think of automatically logging in the next time the staff visits the site is by storing the password in a enrypted cookie and checking of its existing when the site is visited and then calling the API login method using the username and decrypted password cookie values.Any other ideas as an alternative welcomed.'m using some code found on the web to encrypt and decrypt a password string. It encrypts fine but when it calls the code below to decrypt the string it throws the error "Length of the data to decrypt is invalid" How can I resolve this?

System.Text.Encoding enc = System.Text.Encoding.ASCII;
byte[] myByteArray = enc.GetBytes(_pword);
SymmetricAlgorithm sa = DES.Create();

[code]...

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