/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org */#include "mycrypt.h"#ifdef PACKETint packet_valid_header(unsigned char *src, int section, int subsection){   unsigned long ver;   _ARGCHK(src != NULL);   /* check version */   ver = ((unsigned long)src[0]) | ((unsigned long)src[1] << 8U);   if (CRYPT < ver) {      return CRYPT_INVALID_PACKET;   }   /* check section and subsection */   if (section != (int)src[2] || subsection != (int)src[3]) {      return CRYPT_INVALID_PACKET;   }   return CRYPT_OK;}#endif