nixos/modules/system/boot/pbkdf2-sha512.c

   1 #include <stdint.h>
   2 #include <string.h>
   3 #include <stdio.h>
   4 #include <openssl/evp.h>
   5
   6 void hextorb(uint8_t* hex, uint8_t* rb)
   7 {
   8         while(sscanf(hex, "%2x", rb) == 1)
   9         {
  10                 hex += 2;
  11                 rb += 1;
  12         }
  13         *rb = '\0';
  14 }
  15
  16 int main(int argc, char** argv)
  17 {
  18         uint8_t k_user[2048];
  19         uint8_t salt[2048];
  20         uint8_t key[4096];
  21
  22         uint32_t key_length = atoi(argv[1]);
  23         uint32_t iteration_count = atoi(argv[2]);
  24
  25         hextorb(argv[3], salt);
  26         uint32_t salt_length = strlen(argv[3]) / 2;
  27
  28         fgets(k_user, 2048, stdin);
  29         uint32_t k_user_length = strlen(k_user);
  30         if(k_user[k_user_length - 1] == '\n') {
  31                         k_user[k_user_length - 1] = '\0';
  32         }
  33
  34         PKCS5_PBKDF2_HMAC(k_user, k_user_length, salt, salt_length, iteration_count, EVP_sha512(), key_length, key);
  35         fwrite(key, 1, key_length, stdout);
  36
  37         return 0;
  38 }