private void InitializeBCryptHash(SecureString base64EncodedPassword, int base64EncodedPasswordLength, out IntPtr hashHandle)
{
IntPtr keyBytes = IntPtr.Zero;
uint keyBytesLength = 0;
try
{
Base64Helper.SecureStringToNativeBytes(base64EncodedPassword, base64EncodedPasswordLength, out keyBytes, out keyBytesLength);
int status = NativeMethods.BCryptCreateHash(this.algorithmHandle,
out hashHandle,
IntPtr.Zero,
0,
keyBytes,
keyBytesLength,
0);
if (status != 0)
{
throw new Win32Exception(status, "BCryptCreateHash");
}
}
finally
{
if (keyBytes != IntPtr.Zero)
{
for (int n = 0; n < (int)keyBytesLength; n++)
{
Marshal.WriteByte(keyBytes, n, 0);
}
Marshal.FreeCoTaskMem(keyBytes);
keyBytes = IntPtr.Zero;
keyBytesLength = 0;
}
}
}