X509Certificate2 from store with private key

问题

I have a X509Certificate2 with private key NOT exportable from the Windows store with this code:

X509Certificate2 oCertificato = null;

X509Store my = new X509Store(StoreName.My, StoreLocation.CurrentUser);
my.Open(OpenFlags.ReadOnly);
System.Security.Cryptography.RSACryptoServiceProvider csp = null;
foreach (X509Certificate2 cert in my.Certificates)
{
    if (cert.SerialNumber.Trim() == cSerial)
    {
        csp = (System.Security.Cryptography.RSACryptoServiceProvider)cert.PrivateKey;
        oCertificato = cert;
        break;
    }
}

When I use the certificate with a web service Windows ask the private key. Question: How can I send the private key to certificate?

Regards.

---

EDIT: This is the function with the connection as the web service:

string cEndPoint = Leo.myendpoint();

ServicePointManager.ServerCertificateValidationCallback = CertificateHandler;

datiOperatore DataOp = Leo.OperatorData();//Operator data request from system (it's ok)
datiApplicativo DataApp = Leo.AppData();//program data request from system (it's ok)

var b = new CustomBinding();
var sec = new AsymmetricSecurityBindingElement(
    new X509SecurityTokenParameters(X509KeyIdentifierClauseType.Any, SecurityTokenInclusionMode.Never),
    new X509SecurityTokenParameters(X509KeyIdentifierClauseType.Any, SecurityTokenInclusionMode.AlwaysToRecipient));
sec.MessageSecurityVersion = MessageSecurityVersion.WSSecurity10WSTrust13WSSecureConversation13WSSecurityPolicy12BasicSecurityProfile10;
sec.SecurityHeaderLayout = SecurityHeaderLayout.Strict;
sec.IncludeTimestamp = true;
sec.SetKeyDerivation(false);
sec.KeyEntropyMode = System.ServiceModel.Security.SecurityKeyEntropyMode.ServerEntropy;
sec.EnableUnsecuredResponse = true;

b.Elements.Add(sec);

b.Elements.Add(new TextMessageEncodingBindingElement(MessageVersion.Soap11, Encoding.UTF8));
b.Elements.Add(new HttpsTransportBindingElement());

EndpointAddress ea = new EndpointAddress(cEndPoint);

oClient = new CVPClient(b, ea);

X509Certificate2 certSigned = Leo.GetSignedCert();//HERE IS THE REQUEST OF PRIVATE KEY
X509Certificate2 certUnsigned = Leo.GetUnSignedCertificate();

oClient.ClientCredentials.ClientCertificate.Certificate = certSigned;
oClient.ClientCredentials.ServiceCertificate.DefaultCertificate = certUnsigned;

回答1:

I solving the problem:

string cPin = "12345";
System.Security.SecureString SecurePIN = new System.Security.SecureString();
foreach (char ch in cPin)
{ SecurePIN.AppendChar(ch); }
var rsa = (RSACryptoServiceProvider)certSigned.PrivateKey;
string ContinerName = rsa.CspKeyContainerInfo.KeyContainerName;
string CspName = rsa.CspKeyContainerInfo.ProviderName;
int CspType = rsa.CspKeyContainerInfo.ProviderType;
CspParameters csp = new CspParameters(CspType, CspName, ContinerName, new System.Security.AccessControl.CryptoKeySecurity(), SecurePIN);
RSACryptoServiceProvider CSP = new RSACryptoServiceProvider(csp);

I hope it is useful to others

来源：https://stackoverflow.com/questions/36371174/x509certificate2-from-store-with-private-key