28 lines
624 B
C
28 lines
624 B
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/**
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@file ocb_shift_xor.c
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OCB implementation, internal function, by Tom St Denis
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*/
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#include "tomcrypt_private.h"
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#ifdef LTC_OCB_MODE
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/**
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Compute the shift/xor for OCB (internal function)
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@param ocb The OCB state
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@param Z The destination of the shift
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*/
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void ocb_shift_xor(ocb_state *ocb, unsigned char *Z)
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{
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int x, y;
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y = ocb_ntz(ocb->block_index++);
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for (x = 0; x < ocb->block_len; x++) {
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ocb->Li[x] ^= ocb->Ls[y][x];
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Z[x] = ocb->Li[x] ^ ocb->R[x];
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}
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}
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#endif
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