45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/* 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://libtom.org
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*/
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#include "tomcrypt.h"
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/**
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@file pmac_shift_xor.c
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PMAC implementation, internal function, by Tom St Denis
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*/
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#ifdef LTC_PMAC
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/**
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Internal function. Performs the state update (adding correct multiple)
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@param pmac The PMAC state.
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*/
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void pmac_shift_xor(pmac_state *pmac)
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{
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int x, y;
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y = pmac_ntz(pmac->block_index++);
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#ifdef LTC_FAST
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for (x = 0; x < pmac->block_len; x += sizeof(LTC_FAST_TYPE)) {
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*((LTC_FAST_TYPE*)((unsigned char *)pmac->Li + x)) ^=
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*((LTC_FAST_TYPE*)((unsigned char *)pmac->Ls[y] + x));
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}
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#else
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for (x = 0; x < pmac->block_len; x++) {
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pmac->Li[x] ^= pmac->Ls[y][x];
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}
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#endif
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}
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#endif
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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