keygen.c


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

int main(void)
{
	char* username = "someusersomeusersomeuser";
	char* magic = "_r <()<1-Z2[l5,^";

	char* key = calloc(strlen(magic) + 1, sizeof(*magic));
	if (key == NULL) return 1;

	strcpy(key, magic);
	size_t ulen = strlen(username);
	size_t mlen = strlen(magic);

	for (size_t i = 0; i < ulen; i++)
	{
		char tmp = username[i] ^ key[i % mlen];
		tmp %= 0x19;
		tmp += 0x41;
		key[i % mlen] = tmp;
	}

	printf("%s\n%.4s-%.4s-%.4s-%.4s\n", username, key, key+4, key+8,key+12);
	free(key);

	return 0;
}