on prototypes, void means sth

client/loclass/cipher.h

@@ -44,7 +44,7 @@ void doMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4]);
 void doMAC_N(uint8_t *address_data_p, uint8_t address_data_size, uint8_t *div_key_p, uint8_t mac[4]);
 
 #ifndef ON_DEVICE
-int testMAC();
+int testMAC(void);
 #endif
 
 #endif // CIPHER_H

client/loclass/cipherutils.h

@@ -60,7 +60,7 @@ void pushBit(BitstreamOut *stream, bool bit);
 int bitsLeft(BitstreamIn *stream);
 #ifndef ON_DEVICE
 int testCipherUtils(void);
-int testMAC();
+int testMAC(void);
 #endif
 void push6bits(BitstreamOut *stream, uint8_t bits);
 void EncryptDES(bool key[56], bool outBlk[64], bool inBlk[64], int verbose) ;

client/loclass/elite_crack.h

@@ -124,7 +124,7 @@ int calculateMasterKey(uint8_t first16bytes[], uint64_t master_key[]);
  * @brief Test function
  * @return
  */
-int testElite();
+int testElite(void);
 
 /**
       Here are some pretty optimal values that can be used to recover necessary data in only

client/loclass/hash1_brute.h

@@ -1,5 +1,5 @@
 #ifndef HASH1_BRUTE_H
 #define HASH1_BRUTE_H
-void brute_hash1();
+void brute_hash1(void);
 
 #endif // HASH1_BRUTE_H