/* 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 ctr_setiv.c CTR implementation, set IV, Tom St Denis */ #ifdef CTR /** Set an initial vector @param IV The initial vector @param len The length of the vector (in octets) @param ctr The CTR state @return CRYPT_OK if successful */ int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr) { int err; LTC_ARGCHK(IV != NULL); LTC_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 */ XMEMCPY(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 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */ /* $Revision: 1.3 $ */ /* $Date: 2005/05/05 14:35:59 $ */