From 6b38ac5bfda54e8e28554c6a38092941a477c479 Mon Sep 17 00:00:00 2001 From: Kévin Le Gouguec Date: Tue, 21 May 2019 11:06:56 +0200 Subject: Extraction des multiplications hors de tweakey.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit De façon à ce que d'autres versions puissent réutiliser l'un ou l'autre. --- src/ref/multiplications.h | 114 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 src/ref/multiplications.h (limited to 'src/ref/multiplications.h') diff --git a/src/ref/multiplications.h b/src/ref/multiplications.h new file mode 100644 index 0000000..32327f2 --- /dev/null +++ b/src/ref/multiplications.h @@ -0,0 +1,114 @@ +/* +Implementation of the Lilliput-AE tweakable block cipher. + +Authors, hereby denoted as "the implementer": + Kévin Le Gouguec, + 2019. + +For more information, feedback or questions, refer to our website: +https://paclido.fr/lilliput-ae + +To the extent possible under law, the implementer has waived all copyright +and related or neighboring rights to the source code in this file. +http://creativecommons.org/publicdomain/zero/1.0/ + +--- + +This file implements the alpha-multiplications used in Lilliput-TBC's +tweakey schedule, where each matrix M and M_R to the power n are +implemented in distinct functions with shifts and XORs. +*/ + +#ifndef MULTIPLICATIONS_H +#define MULTIPLICATIONS_H + +#include + +#include "constants.h" + +static void _multiply_M(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + y[7] = x[6]; + y[6] = x[5]; + y[5] = x[5]<<3 ^ x[4]; + y[4] = x[4]>>3 ^ x[3]; + y[3] = x[2]; + y[2] = x[6]<<2 ^ x[1]; + y[1] = x[0]; + y[0] = x[7]; +} + +static void _multiply_M2(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + uint8_t x_M_5 = x[5]<<3 ^ x[4]; + uint8_t x_M_4 = x[4]>>3 ^ x[3]; + + y[7] = x[5]; + y[6] = x_M_5; + y[5] = x_M_5<<3 ^ x_M_4; + y[4] = x_M_4>>3 ^ x[2]; + y[3] = x[6]<<2 ^ x[1]; + y[2] = x[5]<<2 ^ x[0]; + y[1] = x[7]; + y[0] = x[6]; +} + +static void _multiply_M3(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + uint8_t x_M_5 = x[5]<<3 ^ x[4]; + uint8_t x_M_4 = x[4]>>3 ^ x[3]; + uint8_t x_M2_5 = x_M_5<<3 ^ x_M_4; + uint8_t x_M2_4 = x_M_4>>3 ^ x[2]; + + y[7] = x_M_5; + y[6] = x_M2_5; + y[5] = x_M2_5<<3 ^ x_M2_4; + y[4] = x_M2_4>>3 ^ x[6]<<2 ^ x[1]; + y[3] = x[5]<<2 ^ x[0]; + y[2] = x_M_5<<2 ^ x[7]; + y[1] = x[6]; + y[0] = x[5]; +} + +static void _multiply_MR(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + y[0] = x[1]; + y[1] = x[2]; + y[2] = x[3] ^ x[4]>>3; + y[3] = x[4]; + y[4] = x[5] ^ x[6]<<3; + y[5] = x[3]<<2 ^ x[6]; + y[6] = x[7]; + y[7] = x[0]; +} + +static void _multiply_MR2(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + uint8_t x_MR_4 = x[5] ^ x[6]<<3; + + y[0] = x[2]; + y[1] = x[3] ^ x[4]>>3; + y[2] = x[4] ^ x_MR_4>>3; + y[3] = x_MR_4; + y[4] = x[3]<<2 ^ x[6] ^ x[7]<<3; + y[5] = x[4]<<2 ^ x[7]; + y[6] = x[0]; + y[7] = x[1]; +} + +static void _multiply_MR3(const uint8_t x[LANE_BYTES], uint8_t y[LANE_BYTES]) +{ + uint8_t x_MR_4 = x[5] ^ x[6]<<3; + uint8_t x_MR2_4 = x[3]<<2 ^ x[6] ^ x[7]<<3; + + y[0] = x[3] ^ x[4]>>3; + y[1] = x[4] ^ x_MR_4>>3; + y[2] = x_MR_4 ^ x_MR2_4>>3; + y[3] = x_MR2_4; + y[4] = x[0]<<3 ^ x[4]<<2 ^ x[7]; + y[5] = x_MR_4<<2 ^ x[0]; + y[6] = x[1]; + y[7] = x[2]; +} + +#endif /* MULTIPLICATIONS_H */ -- cgit v1.2.3