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Posted by on February 28, 2007, 10:02 am
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RSACryptoProvider creation problem:
I used some code for RSACryptoProvider creation with smart card and
CAPICOM COM object
The code worked well in Framework 1.1
but when I tried the same code in Framework 2.0
I got an following Cryptographic exception:
"Unable to open the access token of the current thread"
string url = string.Empty;
rsa = null;
certificate = null;
RSACryptoServiceProvider.UseMachineKeyStore = true;
CspParameters csp = new CspParameters();
csp.Flags = CspProviderFlags.UseMachineKeyStore;
ICertificate2 selectedCert = null;
//open the ceritificate store
Store st = new Store();
st.Open(CAPICOM_STORE_LOCATION.CAPICOM_CURRENT_USER_STORE,
"My",
CAPICOM_STORE_OPEN_MODE.CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED);
//search for the certificate with the digital signature
enabled
foreach (ICertificate2 currCert in st.Certificates)
{
if (currCert.HasPrivateKey())
{
selectedCert = currCert;
break;
}
}
//check if the certificate was found or not
if (selectedCert == null || selectedCert.HasPrivateKey()
== false ||
selectedCert.PublicKey().Algorithm.FriendlyName != "RSA")
{
StringBuilder sb = new StringBuilder();
sb.Append("Can't find a vaild certificate!\n\n");
sb.Append("Valid Certificate Authorities are :\n");
System.Collections.IEnumerator myEnum =
issuerlist.GetEnumerator();
while (myEnum.MoveNext())
sb.Append(myEnum.Current).Append("\n");
throw new Exception(sb.ToString());
}
certificate = selectedCert;
//create cerificate provider
csp.KeyContainerName =
selectedCert.PrivateKey.ContainerName;
csp.ProviderName = selectedCert.PrivateKey.ProviderName;
csp.ProviderType =
Convert.ToInt32(selectedCert.PrivateKey.ProviderType);
//the certificate key number by the key specifications
switch (selectedCert.PrivateKey.KeySpec)
{
case CAPICOM_KEY_SPEC.CAPICOM_KEY_SPEC_KEYEXCHANGE:
csp.KeyNumber = 1;
break;
case CAPICOM_KEY_SPEC.CAPICOM_KEY_SPEC_SIGNATURE:
csp.KeyNumber = 2;
break;
}
//for machine keys use the local store of the machine
if (selectedCert.PrivateKey.IsMachineKeyset())
{
csp.Flags = CspProviderFlags.UseMachineKeyStore;
}
//create rsa cryptogragic provider based on the CSP
try
{
rsa = new RSACryptoServiceProvider(csp);
}
catch
{ }
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