/* 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 *//* EAX Implementation by Tom St Denis */#include "mycrypt.h"#ifdef EAX_MODEint eax_decrypt_verify_memory(int cipher,    const unsigned char *key,    unsigned long keylen,    const unsigned char *nonce,  unsigned long noncelen,    const unsigned char *header, unsigned long headerlen,    const unsigned char *ct,     unsigned long ctlen,          unsigned char *pt,          unsigned char *tag,    unsigned long taglen,          int           *res){   int err;   eax_state eax;   unsigned char buf[MAXBLOCKSIZE];   unsigned long buflen;   _ARGCHK(res != NULL);   /* default to zero */   *res = 0;   if ((err = eax_init(&eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {      return err;   }   if ((err = eax_decrypt(&eax, ct, pt, ctlen)) != CRYPT_OK) {      return err;   }    buflen = MIN(sizeof(buf), taglen);   if ((err = eax_done(&eax, buf, &buflen)) != CRYPT_OK) {      return err;   }   /* compare tags */   if (buflen >= taglen && memcmp(buf, tag, taglen) == 0) {      *res = 1;   }#ifdef CLEAN_STACK   zeromem(buf, sizeof(buf));#endif   return CRYPT_OK;}#endif