internal override unsafe NCryptKeyOrCryptProviderSafeHandle OpenExisting(string keyName, out KeySpec keySpec)
{
keySpec = KeySpec.NONE;
const int DOES_NOT_EXIST = unchecked ((int)0x80090016);
NCryptKeyOrCryptProviderSafeHandle provider;
if (!AdvApi32.CryptAcquireContext(out provider, keyName, _providerName, ProviderType.PROV_RSA_AES, 0u))
{
var result = Marshal.GetLastWin32Error();
if (result == DOES_NOT_EXIST)
{
return(null);
}
throw new Win32Exception(Marshal.GetLastWin32Error());
}
const uint PP_KEYSPEC = 0x27;
uint * keySpecBuffer = stackalloc uint[1];
var dataLength = (uint)Marshal.SizeOf(typeof(uint));
if (!AdvApi32.CryptGetProvParam(provider, PP_KEYSPEC, keySpecBuffer, ref dataLength, 0u))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
keySpec = (KeySpec)(*keySpecBuffer);
return(provider);
}
internal override string GetName(NCryptKeyOrCryptProviderSafeHandle handle)
{
const int PP_NAME = 0x6;
uint size = 0;
if (!AdvApi32.CryptGetProvParam(handle, PP_NAME, IntPtr.Zero, ref size, 0u))
{
throw new InvalidOperationException("Failed to get property.");
}
var buffer = Marshal.AllocHGlobal((int)size);
try
{
if (!AdvApi32.CryptGetProvParam(handle, PP_NAME, buffer, ref size, 0u))
{
throw new InvalidOperationException("Failed to get property.");
}
return(Marshal.PtrToStringAnsi(buffer));
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}