text: #ifndef CRYPTO_RANDOM_E61CEB7E_6B01_4C44_ACF6_FAF340C4876C_H
  #define CRYPTO_RANDOM_E61CEB7E_6B01_4C44_ACF6_FAF340C4876C_H
  
  #include <stdlib.h>
  
  /**
   * Generate crypto random.
   *
   * used this function to generate iv, salt etc.
   */
  void crypto_random(void *buf, size_t nbytes);
  
  #endif
  