pqcrypto/crypto_kem/ledakemlt52/leaktime/H_Q_matrices_generation.c

#include "H_Q_matrices_generation.h"
#include "gf2x_arith_mod_xPplusOne.h"

void PQCLEAN_LEDAKEMLT52_LEAKTIME_generateHPosOnes(POSITION_T HPosOnes[N0][DV],
        AES_XOF_struct *keys_expander) {

    for (int i = 0; i < N0; i++) {
        /* Generate a random block of Htr */
        PQCLEAN_LEDAKEMLT52_LEAKTIME_rand_circulant_sparse_block(&HPosOnes[i][0],
                DV,
                keys_expander);
    }
}

void PQCLEAN_LEDAKEMLT52_LEAKTIME_generateQPosOnes(POSITION_T QPosOnes[N0][M],
        AES_XOF_struct *keys_expander) {

    for (int i = 0; i < N0; i++) {
        int placed_ones = 0;
        for (int j = 0; j < N0; j++) {
            PQCLEAN_LEDAKEMLT52_LEAKTIME_rand_circulant_sparse_block(&QPosOnes[i][placed_ones],
                    qBlockWeights[i][j],
                    keys_expander);
            placed_ones += qBlockWeights[i][j];
        }
    }
}

void PQCLEAN_LEDAKEMLT52_LEAKTIME_transposeHPosOnes(POSITION_T HtrPosOnes[N0][DV], /* output*/
        POSITION_T HPosOnes[N0][DV]) {

    for (int i = 0; i < N0; i++) {
        /* Obtain directly the sparse representation of the block of H */
        for (int k = 0; k < DV; k++) {
            HtrPosOnes[i][k] = (P - HPosOnes[i][k])  % P; /* transposes indexes */
        }// end for k
    }
}

void PQCLEAN_LEDAKEMLT52_LEAKTIME_transposeQPosOnes(POSITION_T QtrPosOnes[N0][M], /* output*/
        POSITION_T QPosOnes[N0][M]) {

    unsigned transposed_ones_idx[N0] = {0x00};
    for (unsigned source_row_idx = 0; source_row_idx < N0 ; source_row_idx++) {
        int currQoneIdx = 0; // position in the column of QtrPosOnes[][...]
        int endQblockIdx = 0;
        for (int blockIdx = 0; blockIdx < N0; blockIdx++) {
            endQblockIdx += qBlockWeights[source_row_idx][blockIdx];
            for (; currQoneIdx < endQblockIdx; currQoneIdx++) {
                QtrPosOnes[blockIdx][transposed_ones_idx[blockIdx]] = (P -
                        QPosOnes[source_row_idx][currQoneIdx]) % P;
                transposed_ones_idx[blockIdx]++;
            }
        }
    }
}