telegram/crypto/words.js

NodeJS/Browser MTProto API Telegram client library,

"use strict";
/*
 * Imported from https://github.com/spalt08/cryptography/blob/master/packages/aes/src/utils/words.ts
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.s2i = s2i;
exports.getWords = getWords;
exports.xor = xor;
function s2i(str, pos) {
    return ((str.charCodeAt(pos) << 24) ^
        (str.charCodeAt(pos + 1) << 16) ^
        (str.charCodeAt(pos + 2) << 8) ^
        str.charCodeAt(pos + 3));
}
/**
 * Helper function for transforming string key to Uint32Array
 */
function getWords(key) {
    if (key instanceof Uint32Array) {
        return key;
    }
    if (typeof key === "string") {
        if (key.length % 4 !== 0)
            for (let i = key.length % 4; i <= 4; i++)
                key += "\0x00";
        const buf = new Uint32Array(key.length / 4);
        for (let i = 0; i < key.length; i += 4)
            buf[i / 4] = s2i(key, i);
        return buf;
    }
    if (key instanceof Uint8Array) {
        const buf = new Uint32Array(key.length / 4);
        for (let i = 0; i < key.length; i += 4) {
            buf[i / 4] =
                (key[i] << 24) ^
                    (key[i + 1] << 16) ^
                    (key[i + 2] << 8) ^
                    key[i + 3];
        }
        return buf;
    }
    throw new Error("Unable to create 32-bit words");
}
function xor(left, right, to = left) {
    for (let i = 0; i < left.length; i++)
        to[i] = left[i] ^ right[i];
}