33 lines
782 B
C
33 lines
782 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 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_PTR_CAST((unsigned char *)pmac->Li + x)) ^=
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*(LTC_FAST_TYPE_PTR_CAST((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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