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Windows 95 Key generator
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#include <stdio.h> | |
#include <stdint.h> | |
#include <stdlib.h> | |
#include <stddef.h> | |
#include <string.h> | |
#include <stdbool.h> | |
#include <time.h> | |
#define random_between(min, max) (rand() % (max - min) + min) | |
bool keygen_first_3_letters_are_invalid(const char *string) { | |
for (char c = '3'; c <= '9'; c++) { | |
if (string[0] == string[1] == string[2] == c) return true; | |
} | |
return false; | |
} | |
bool keygen_last_7_letters_is_divisble(const char *string) { | |
int n = 0; | |
for (int i = 0; i < 7; i++) { | |
n += string[i] - '0'; | |
} | |
return !(n % 7); | |
} | |
char keygen_return_random_digit(void) { | |
return random_between('0', '9'); | |
} | |
void keygen_generate_non_oem_key(char *key, size_t length) { | |
if (length < 12) return; | |
memset(key, '0', 11); | |
key[12] = 0; | |
key[3] = '-'; | |
do { | |
for (int i = 0; i < 3; i++) { | |
key[i] = keygen_return_random_digit(); | |
} | |
} while (keygen_first_3_letters_are_invalid(key)); | |
do { | |
for (int i = 0; i < 7; i++) { | |
key[i + 4] = keygen_return_random_digit(); | |
} | |
} while(!keygen_last_7_letters_is_divisble(&key[4])); | |
} | |
void keygen_generate_oem_key(char *key, size_t length) { | |
if (length < 24) return; | |
memset(key, '0', 23); | |
key[23] = 0; | |
key[5] = '-'; | |
key[6] = 'O'; | |
key[7] = 'E'; | |
key[8] = 'M'; | |
key[9] = '-'; | |
key[17] = '-'; | |
int day = random_between(1, 366); | |
int year = (random_between(1995, 2002)) % 100; | |
key[0] = ((day / 100) % 10) + '0'; | |
key[1] = ((day / 10) % 10) + '0'; | |
key[2] = ((day) / 100) + '0'; | |
key[3] = (year / 10) + '0'; | |
key[4] = (year % 10) + '0'; | |
do { | |
for (int i = 0; i < 6; i++) { | |
key[i + 11] = keygen_return_random_digit(); | |
} | |
} while(!keygen_last_7_letters_is_divisble(&key[10])); | |
for (int i = 0; i < 5; i++) { | |
key[i + 18] = keygen_return_random_digit(); | |
} | |
} | |
int main(void) { | |
char key[24] = {0}; | |
srand(time(0)); | |
keygen_generate_non_oem_key(key, 24); | |
printf("Key: %s\n", key); | |
keygen_generate_oem_key(key, 24); | |
printf("OEM Key: %s\n", key); | |
return 0; | |
} |
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