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37 lines
1.1 KiB
37 lines
1.1 KiB
/**
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*--------------------------------------------------------------------\n
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* HSLU T&A Hochschule Luzern Technik+Architektur \n
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*--------------------------------------------------------------------\n
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*
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* \brief model solution for ASYD assignment crypto 01
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* \file
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* \author SIMON FREI, stefano.nicora@hslu.ch
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* \date 04.10.22
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*
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*--------------------------------------------------------------------
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*/
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#include <stdint.h>
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#include "XTEA-CBC.h"
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#include "XTEA.h"
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#define INITIALIZATION_VECTOR { 'COFE', 'SIMI' }
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void encipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) {
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static uint32_t v_prev[2] = INITIALIZATION_VECTOR;
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v[0] = v[0] ^ v_prev[0];
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v[1] = v[1] ^ v_prev[1];
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encipher(num_cycles, v, k);
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v_prev[0] = v[0];
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v_prev[1] = v[1];
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}
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void decipher_CBC(unsigned int num_cycles, uint32_t v[2], uint32_t const k[4]) {
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static uint32_t v_prev[2] = INITIALIZATION_VECTOR;
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uint32_t v_input[2] = { v[0], v[1] };
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decipher(num_cycles, v, k);
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v[0] = v[0] ^ v_prev[0];
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v[1] = v[1] ^ v_prev[1];
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v_prev[0] = v_input[0];
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v_prev[1] = v_input[1];
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}
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