41 lines
953 B
C
41 lines
953 B
C
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
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*/
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/**
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@file gcm_reset.c
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GCM implementation, reset a used state so it can accept IV data, by Tom St Denis
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*/
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#include "tomcrypt.h"
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#ifdef GCM_MODE
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/**
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Reset a GCM state to as if you just called gcm_init(). This saves the initialization time.
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@param gcm The GCM state to reset
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@return CRYPT_OK on success
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*/
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int gcm_reset(gcm_state *gcm)
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{
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LTC_ARGCHK(gcm != NULL);
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zeromem(gcm->buf, sizeof(gcm->buf));
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zeromem(gcm->X, sizeof(gcm->X));
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gcm->mode = GCM_MODE_IV;
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gcm->ivmode = 0;
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gcm->buflen = 0;
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gcm->totlen = 0;
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gcm->pttotlen = 0;
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return CRYPT_OK;
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}
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#endif
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