https://osandamalith.wordpress.com/2015/11/30/newbie-keygenning-1

newbiekeygen1.c

#include <stdio.h>
#include <string.h>

int main() {
	char name[61];
	size_t i = 0;
	int Char;
	int Xor;
	int total;
	int sum;
	
	puts(
	"\t\t| Keygenning4newbies CrackMe1\n"
	"\t\t| KeyGen coded by @OsandaMalith\n"
	"\t\t| http://osandamalith.wordpress.com\n"
	);
	
	printf("Enter Name: ");
	fgets(name,60,stdin);
	
	if(strlen(name)-1 <= 3 || strlen(name)-1 >= 50) {
		fprintf(stderr,"%s","Name should be between 3 to 50 characters.");
		exit(-1);
	} 
	
	while(i < strlen(name) - 1) {
		Char = name[i++];
		Xor = Char ^ i;
		total += Xor;
	}  
	
	sum = (total << 7) + 6 * Xor;
	printf("Serial: %X",sum);
}