35 lines
886 B
C
35 lines
886 B
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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/**
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@file ofb_getiv.c
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OFB implementation, get IV, Tom St Denis
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*/
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#ifdef LTC_OFB_MODE
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/**
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Get the current initialization vector
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@param IV [out] The destination of the initialization vector
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@param len [in/out] The max size and resulting size of the initialization vector
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@param ofb The OFB state
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@return CRYPT_OK if successful
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*/
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int ofb_getiv(unsigned char *IV, unsigned long *len, const symmetric_OFB *ofb)
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{
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(len != NULL);
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LTC_ARGCHK(ofb != NULL);
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if ((unsigned long)ofb->ecb.blocklen > *len) {
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*len = ofb->ecb.blocklen;
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return CRYPT_BUFFER_OVERFLOW;
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}
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XMEMCPY(IV, ofb->IV, ofb->ecb.blocklen);
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*len = ofb->ecb.blocklen;
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return CRYPT_OK;
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}
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#endif
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