#include <hwo/runtime.h>
#include <hwo/bits.h>

uint8_t	rt_authenticate(int32_t token) {
	uint8_t	sum;
	
	if (token == 0) {
		rt_ram.accesscode.code = 0;
	} else {
		sum = 0xE2;
		sum ^= rol8( (token >> 0) & 0xff, 3 );
		sum ^= rol8( (token >> 8) & 0xff, 5 );
		sum ^= rol8( (token >> 16) & 0xff, 2 );
		sum ^= rol8( (token >> 24) & 0xff, 1 );

		if (sum) {
			sum ^= rol8( (rt_ram.eeprom.serial.family),6 );
		};
				
		if (!sum) {
			rt_ram.accesscode.code = token;
			
			rt_ram.eeprom.last_auth = rt_ram.accesscode.servicepartner;
			
			runtime_signal();
			return -1;
		} else {
			rt_ram.accesscode.code = 0;
		};
	};
	runtime_signal();
	return 0;
};