@sskmy1024y/react-native-hash/JSHash/lib/core/Hex.js

A hashing library for react-native

/* eslint linebreak-style: ["error", "windows"] */
/* eslint-disable no-use-before-define */

import WordArray from './WordArray.js';


/**
 * Hex encoding strategy.
 */

const Hex = {
  /**
     * Converts a word array to a hex string.
     *
     * @param {WordArray} wordArray The word array.
     *
     * @return {string} The hex string.
     *
     * @static
     *
     * @example
     *
     *     var hexString = CryptoJS.enc.Hex.stringify(wordArray);
     */
  stringify(wordArray) {
    // Shortcuts
    const { words, sigBytes } = wordArray;

    // Convert
    const hexChars = [];
    for (let i = 0; i < sigBytes; i += 1) {
      const bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
      hexChars.push((bite >>> 4).toString(16));
      hexChars.push((bite & 0x0f).toString(16));
    }

    return hexChars.join('');
  },

  /**
     * Converts a hex string to a word array.
     *
     * @param {string} hexStr The hex string.
     *
     * @return {WordArray} The word array.
     *
     * @static
     *
     * @example
     *
     *     var wordArray = CryptoJS.enc.Hex.parse(hexString);
     */
  parse(hexStr) {
    // Shortcut
    const hexStrLength = hexStr.length;

    // Convert
    const words = [];
    for (let i = 0; i < hexStrLength; i += 2) {
      words[i >>> 3] |= parseInt(hexStr.substr(i, 2), 16) << (24 - (i % 8) * 4);
    }

    return new WordArray(words, hexStrLength / 2);
  },
};

export default Hex;