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  1.  
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <stddef.h>
  5. #include <stdint.h>
  6.  
  7. int main(int argc, const char **argv) {
  8.     uint32_t check = 0xBADBEEF;
  9.     uint32_t i;
  10.     uint8_t digit;
  11.     const char *key;
  12.     char c;
  13.  
  14.     if (argc < 2) {
  15.         printf("USAGE: prosum <cdkey>\n");
  16.         return 1;
  17.     }
  18.  
  19.     key = argv[1];
  20.  
  21.     if (strlen(key) != 8) {
  22.         printf("ERROR: cdkey must be 8 chars\n");
  23.         return 1;
  24.     }
  25.  
  26.     for (i=0; i < 8; i++) {
  27.         c = key[i];
  28.  
  29.         if (c < 'A' && c > 'F' && c < '0' && c > '9') {
  30.             printf("ERROR: cdkey must contain uppercase letters and numbers\n");
  31.             return 1;
  32.         }
  33.  
  34.         digit = (uint8_t)c;
  35.         check += (0x1337B00B * digit);
  36.     }
  37.  
  38.     digit = ((check & 0xFF) / 2) * 2;
  39.  
  40.     if (digit != 42) {
  41.         printf("ERROR: cdkey is invalid\n");
  42.         return 1;
  43.     }
  44.  
  45.     printf("Pro version unlocked\n");
  46.     return 0;
  47. }
  48.  
Runtime error #stdin #stdout 0s 2052KB
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USAGE: prosum <cdkey>
https://ideone.com/otvEa7
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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