/* 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 CTRint ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr){   int err;      _ARGCHK(IV  != NULL);   _ARGCHK(ctr != NULL);   /* bad param? */   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {      return err;   }      if (len != (unsigned long)ctr->blocklen) {      return CRYPT_INVALID_ARG;   }   /* set IV */   memcpy(ctr->ctr, IV, len);      /* force next block */   ctr->padlen = 0;   cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);      return CRYPT_OK;}#endif