1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomCrypt is a library that provides various cryptographic 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * algorithms in a highly modular and flexible manner. 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "tomcrypt.h" 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @file ofb_getiv.c 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project OFB implementation, get IV, Tom St Denis 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef LTC_OFB_MODE 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/** 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project Get the current initial vector 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param IV [out] The destination of the initial vector 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param len [in/out] The max size and resulting size of the initial vector 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @param ofb The OFB state 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project @return CRYPT_OK if successful 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project*/ 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint ofb_getiv(unsigned char *IV, unsigned long *len, symmetric_OFB *ofb) 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(IV != NULL); 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(len != NULL); 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project LTC_ARGCHK(ofb != NULL); 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((unsigned long)ofb->blocklen > *len) { 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *len = ofb->blocklen; 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_BUFFER_OVERFLOW; 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project XMEMCPY(IV, ofb->IV, ofb->blocklen); 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *len = ofb->blocklen; 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return CRYPT_OK; 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_getiv.c,v $ */ 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.6 $ */ 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/06/29 01:51:34 $ */ 47