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
