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Filename : x64-core.js
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import {
  Base,
  WordArray,
} from './core.js';

const X32WordArray = WordArray;

/**
 * A 64-bit word.
 */
export class X64Word extends Base {
  /**
   * Initializes a newly created 64-bit word.
   *
   * @param {number} high The high 32 bits.
   * @param {number} low The low 32 bits.
   *
   * @example
   *
   *     var x64Word = CryptoJS.x64.Word.create(0x00010203, 0x04050607);
   */
  constructor(high, low) {
    super();

    this.high = high;
    this.low = low;
  }
}

/**
 * An array of 64-bit words.
 *
 * @property {Array} words The array of CryptoJS.x64.Word objects.
 * @property {number} sigBytes The number of significant bytes in this word array.
 */
export class X64WordArray extends Base {
  /**
   * Initializes a newly created word array.
   *
   * @param {Array} words (Optional) An array of CryptoJS.x64.Word objects.
   * @param {number} sigBytes (Optional) The number of significant bytes in the words.
   *
   * @example
   *
   *     var wordArray = CryptoJS.x64.WordArray.create();
   *
   *     var wordArray = CryptoJS.x64.WordArray.create([
   *         CryptoJS.x64.Word.create(0x00010203, 0x04050607),
   *         CryptoJS.x64.Word.create(0x18191a1b, 0x1c1d1e1f)
   *     ]);
   *
   *     var wordArray = CryptoJS.x64.WordArray.create([
   *         CryptoJS.x64.Word.create(0x00010203, 0x04050607),
   *         CryptoJS.x64.Word.create(0x18191a1b, 0x1c1d1e1f)
   *     ], 10);
   */
  constructor(words = [], sigBytes = words.length * 8) {
    super();

    this.words = words;
    this.sigBytes = sigBytes;
  }

  /**
   * Converts this 64-bit word array to a 32-bit word array.
   *
   * @return {CryptoJS.lib.WordArray} This word array's data as a 32-bit word array.
   *
   * @example
   *
   *     var x32WordArray = x64WordArray.toX32();
   */
  toX32() {
    // Shortcuts
    const x64Words = this.words;
    const x64WordsLength = x64Words.length;

    // Convert
    const x32Words = [];
    for (let i = 0; i < x64WordsLength; i += 1) {
      const x64Word = x64Words[i];
      x32Words.push(x64Word.high);
      x32Words.push(x64Word.low);
    }

    return X32WordArray.create(x32Words, this.sigBytes);
  }

  /**
   * Creates a copy of this word array.
   *
   * @return {X64WordArray} The clone.
   *
   * @example
   *
   *     var clone = x64WordArray.clone();
   */
  clone() {
    const clone = super.clone.call(this);

    // Clone "words" array
    clone.words = this.words.slice(0);
    const { words } = clone;

    // Clone each X64Word object
    const wordsLength = words.length;
    for (let i = 0; i < wordsLength; i += 1) {
      words[i] = words[i].clone();
    }

    return clone;
  }
}