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58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/**
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*
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* <niederreiter_encrypt.c>
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*
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* @version 2.0 (March 2019)
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*
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* Reference ISO-C11 Implementation of the LEDAcrypt KEM-LT cipher using GCC built-ins.
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*
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* In alphabetical order:
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*
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* @author Marco Baldi <m.baldi@univpm.it>
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* @author Alessandro Barenghi <alessandro.barenghi@polimi.it>
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* @author Franco Chiaraluce <f.chiaraluce@univpm.it>
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* @author Gerardo Pelosi <gerardo.pelosi@polimi.it>
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* @author Paolo Santini <p.santini@pm.univpm.it>
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*
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* This code is hereby placed in the public domain.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**/
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#include "niederreiter_encrypt.h"
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#include "qc_ldpc_parameters.h"
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#include "gf2x_arith_mod_xPplusOne.h"
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#include <string.h> // memset(...)
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void encrypt_niederreiter(DIGIT syndrome[], // 1 polynomial
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const publicKeyNiederreiter_t *const pk,
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const DIGIT err[]) { // N0 polynomials
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int i;
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DIGIT saux[NUM_DIGITS_GF2X_ELEMENT];
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memset(syndrome, 0x00, NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B);
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for (i = 0; i < N0 - 1; i++) {
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gf2x_mod_mul(saux,
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pk->Mtr + i * NUM_DIGITS_GF2X_ELEMENT,
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err + i * NUM_DIGITS_GF2X_ELEMENT
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);
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gf2x_mod_add(syndrome, syndrome, saux);
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} // end for
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gf2x_mod_add(syndrome, syndrome, err + (N0 - 1)*NUM_DIGITS_GF2X_ELEMENT);
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} // end encrypt_niederreiter
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/*----------------------------------------------------------------------------*/
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