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      1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
      2  *
      3  * LibTomCrypt is a library that provides various cryptographic
      4  * algorithms in a highly modular and flexible manner.
      5  *
      6  * The library is free for all purposes without any express
      7  * guarantee it works.
      8  *
      9  * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com
     10  */
     11 #include "tomcrypt.h"
     12 
     13 /**
     14    @file ctr_getiv.c
     15    CTR implementation, get IV, Tom St Denis
     16 */
     17 
     18 #ifdef LTC_CTR_MODE
     19 
     20 /**
     21    Get the current initial vector
     22    @param IV   [out] The destination of the initial vector
     23    @param len  [in/out]  The max size and resulting size of the initial vector
     24    @param ctr  The CTR state
     25    @return CRYPT_OK if successful
     26 */
     27 int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
     28 {
     29    LTC_ARGCHK(IV  != NULL);
     30    LTC_ARGCHK(len != NULL);
     31    LTC_ARGCHK(ctr != NULL);
     32    if ((unsigned long)ctr->blocklen > *len) {
     33       *len = ctr->blocklen;
     34       return CRYPT_BUFFER_OVERFLOW;
     35    }
     36    XMEMCPY(IV, ctr->ctr, ctr->blocklen);
     37    *len = ctr->blocklen;
     38 
     39    return CRYPT_OK;
     40 }
     41 
     42 #endif
     43 
     44 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_getiv.c,v $ */
     45 /* $Revision: 1.6 $ */
     46 /* $Date: 2006/06/29 01:46:46 $ */
     47