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@mariotaku
Created February 1, 2014 04:35
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wps checksum tool
#include <stdio.h>
unsigned int wps_pin_checksum(unsigned int pin);
int main(int argc, char *argv[])
{
int pin;
if ((argc == 2 && sscanf(argv[1], "%i", &pin)) || fscanf(stdin, "%i", &pin))
{
if (pin > 9999999)
{
goto error;
}
printf("%07d%d\n", pin, wps_pin_checksum(pin));
return 0;
}
else
{
goto error;
}
error:
{
fprintf(stderr, "Invalid WPS Pin.\n");
return -1;
}
}
/**
* wps_pin_checksum - Compute PIN checksum
* @pin: Seven digit PIN (i.e., eight digit PIN without the checksum digit)
* Returns: Checksum digit
*/
unsigned int wps_pin_checksum(unsigned int pin)
{
unsigned int accum = 0;
while (pin) {
accum += 3 * (pin % 10);
pin /= 10;
accum += pin % 10;
pin /= 10;
}
return (10 - accum % 10) % 10;
}
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