1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */ 2 /* SPDX-License-Identifier: Unlicense */ 3 #include "tomcrypt_private.h" 4 5 /** 6 @file ofb_setiv.c 7 OFB implementation, set IV, Tom St Denis 8 */ 9 10 #ifdef LTC_OFB_MODE 11 12 /** 13 Set an initialization vector 14 @param IV The initialization vector 15 @param len The length of the vector (in octets) 16 @param ofb The OFB state 17 @return CRYPT_OK if successful 18 */ ofb_setiv(const unsigned char * IV,unsigned long len,symmetric_OFB * ofb)19int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb) 20 { 21 int err; 22 23 LTC_ARGCHK(IV != NULL); 24 LTC_ARGCHK(ofb != NULL); 25 26 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { 27 return err; 28 } 29 30 if (len != (unsigned long)ofb->blocklen) { 31 return CRYPT_INVALID_ARG; 32 } 33 34 /* force next block */ 35 ofb->padlen = 0; 36 return cipher_descriptor[ofb->cipher]->ecb_encrypt(IV, ofb->IV, &ofb->key); 37 } 38 39 #endif 40 41