checksum.c

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#include <stdint.h>

#include "checksum.h"

uint8_t checksum(uint64_t in1, uint64_t in2)
{
        uint8_t sum = 0;
        for (int i = 0; i < sizeof(uint64_t); i++)
        {
                uint8_t a = (in1 >> (8*i)) & 0xFF;
                uint8_t b = (in2 >> (8*i)) & 0xFF;
                sum += a + b;
        }
        return sum;
}