+
−/* 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@gmail.com, http://libtomcrypt.org
+
− */
+
−#include "tomcrypt.h"
+
−
+
−/**
+
−   @file cbc_getiv.c
+
−   CBC implementation, get IV, Tom St Denis
+
−*/
+
−
+
−#ifdef CBC
+
−
+
−/**
+
−   Get the current initial vector
+
−   @param IV   [out] The destination of the initial vector
+
−   @param len  [in/out]  The max size and resulting size of the initial vector
+
−   @param cbc  The CBC state
+
−   @return CRYPT_OK if successful
+
−*/
+
−int cbc_getiv(unsigned char *IV, unsigned long *len, symmetric_CBC *cbc)
+
−{
+
−   LTC_ARGCHK(IV  != NULL);
+
−   LTC_ARGCHK(len != NULL);
+
−   LTC_ARGCHK(cbc != NULL);
+
−   if ((unsigned long)cbc->blocklen > *len) {
+
−      return CRYPT_BUFFER_OVERFLOW;
+
−   }
+
−   XMEMCPY(IV, cbc->IV, cbc->blocklen);
+
−   *len = cbc->blocklen;
+
−
+
−   return CRYPT_OK;
+
−}
+
−
+
−#endif