arithmetic-operations-for/integers-modulo-n-big-endian

import assert from 'assert';

import {
    _alloc as n_alloc,
    _copy as n_copy,
} from '@arithmetic-operations-for/naturals-big-endian';

/**
 *
 * |x| >= k
 *
 */
export default function modR(k, x) {
    assert(x.length >= k, '|x| >= k');

    const xmodR = n_alloc(k); // TODO Use UintXArray ?
    n_copy(x, x.length - k, x.length, xmodR, 0);
    return xmodR;
}