// Create an instance using the specified CSP
public CapiContext(CspParameters csp)
{
providerHandle = IntPtr.Zero;
if (csp == null)
{
// default parameters
cspParams = new CspParameters();
}
else
{
// keep of copy of the parameters
cspParams = new CspParameters(csp.ProviderType, csp.ProviderName, csp.KeyContainerName);
cspParams.KeyNumber = csp.KeyNumber;
cspParams.Flags = csp.Flags;
}
// do not show user interface (CRYPT_SILENT) - if UI is required then the function fails.
uint flags = CryptoAPI.CRYPT_SILENT;
if ((cspParams.Flags & CspProviderFlags.UseMachineKeyStore) == CspProviderFlags.UseMachineKeyStore)
{
flags |= CryptoAPI.CRYPT_MACHINE_KEYSET;
}
lastResult = CryptoAPI.CryptAcquireContext(ref providerHandle, cspParams.KeyContainerName,
cspParams.ProviderName, cspParams.ProviderType, flags);
if (!lastResult)
{
// key container may not exist
flags |= CryptoAPI.CRYPT_NEWKEYSET;
lastResult = CryptoAPI.CryptAcquireContext(ref providerHandle, cspParams.KeyContainerName,
cspParams.ProviderName, cspParams.ProviderType, flags);
}
}
