private static void SetPrivateKeyProperty(System.Security.Cryptography.SafeCertContextHandle safeCertContextHandle, ICspAsymmetricAlgorithm asymmetricAlgorithm)
{
SafeLocalAllocHandle invalidHandle = SafeLocalAllocHandle.InvalidHandle;
if (asymmetricAlgorithm != null)
{
CAPIBase.CRYPT_KEY_PROV_INFO structure = new CAPIBase.CRYPT_KEY_PROV_INFO {
pwszContainerName = asymmetricAlgorithm.CspKeyContainerInfo.KeyContainerName,
pwszProvName = asymmetricAlgorithm.CspKeyContainerInfo.ProviderName,
dwProvType = (uint)asymmetricAlgorithm.CspKeyContainerInfo.ProviderType,
dwFlags = asymmetricAlgorithm.CspKeyContainerInfo.MachineKeyStore ? 0x20 : 0,
cProvParam = 0,
rgProvParam = IntPtr.Zero,
dwKeySpec = (uint)asymmetricAlgorithm.CspKeyContainerInfo.KeyNumber
};
invalidHandle = CAPI.LocalAlloc(0x40, new IntPtr(Marshal.SizeOf(typeof(CAPIBase.CRYPT_KEY_PROV_INFO))));
Marshal.StructureToPtr(structure, invalidHandle.DangerousGetHandle(), false);
}
try
{
if (!CAPI.CertSetCertificateContextProperty(safeCertContextHandle, 2, 0, invalidHandle))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
}
finally
{
if (!invalidHandle.IsInvalid)
{
Marshal.DestroyStructure(invalidHandle.DangerousGetHandle(), typeof(CAPIBase.CRYPT_KEY_PROV_INFO));
invalidHandle.Dispose();
}
}
}
internal static bool GetPrivateKeyInfo(System.Security.Cryptography.SafeCertContextHandle safeCertContext, ref CspParameters parameters)
{
SafeLocalAllocHandle invalidHandle = SafeLocalAllocHandle.InvalidHandle;
uint pcbData = 0;
if (!CAPISafe.CertGetCertificateContextProperty(safeCertContext, 2, invalidHandle, ref pcbData))
{
if (Marshal.GetLastWin32Error() != -2146885628)
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
return(false);
}
invalidHandle = CAPI.LocalAlloc(0, new IntPtr((long)pcbData));
if (!CAPISafe.CertGetCertificateContextProperty(safeCertContext, 2, invalidHandle, ref pcbData))
{
if (Marshal.GetLastWin32Error() != -2146885628)
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
return(false);
}
CAPIBase.CRYPT_KEY_PROV_INFO crypt_key_prov_info = (CAPIBase.CRYPT_KEY_PROV_INFO)Marshal.PtrToStructure(invalidHandle.DangerousGetHandle(), typeof(CAPIBase.CRYPT_KEY_PROV_INFO));
parameters.ProviderName = crypt_key_prov_info.pwszProvName;
parameters.KeyContainerName = crypt_key_prov_info.pwszContainerName;
parameters.ProviderType = (int)crypt_key_prov_info.dwProvType;
parameters.KeyNumber = (int)crypt_key_prov_info.dwKeySpec;
parameters.Flags = ((crypt_key_prov_info.dwFlags & 0x20) == 0x20) ? CspProviderFlags.UseMachineKeyStore : CspProviderFlags.NoFlags;
invalidHandle.Dispose();
return(true);
}
