OCBv3: small review

* better LTC_ARGCHK()
* move unnecessary functions from API to be static
* limit malloc'ed data in ocb3_decrypt_verify_memory()

src/headers/tomcrypt_mac.h

@@ -302,8 +302,6 @@ int ocb3_test(void);
 
 #ifdef LTC_SOURCE
 /* internal helper functions */
-int ocb3_int_aad_add_block(ocb3_state *ocb, const unsigned char *aad_block);
-void ocb3_int_calc_offset_zero(ocb3_state *ocb, const unsigned char *nonce, unsigned long noncelen, unsigned long taglen);
 int ocb3_int_ntz(unsigned long x);
 void ocb3_int_xor_blocks(unsigned char *out, const unsigned char *block_a, const unsigned char *block_b, unsigned long block_len);
 #endif /* LTC_SOURCE */