advanced-cipher/dist/index.js

A sophisticated 256-bit encryption library with multi-layer key derivation and complex bit-level transformations

function _classCallCheck(a, n) {
  if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function");
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function _toPropertyKey(t) {
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/**
 * AdvancedCipher - A sophisticated encryption library
 * 
 * @module AdvancedCipher
 * @description Implements a multi-layer encryption algorithm with configurable bit-level security
 */
/**
 * Advanced Symmetric Encryption Algorithm
 * 
 * @class AdvancedCipher
 * @description Provides a robust encryption and decryption mechanism
 * @bitLevel 256 - Utilizes a 256-bit encryption strength for enhanced security
 */
var AdvancedCipher = /*#__PURE__*/function () {
  /**
   * Creates an instance of AdvancedCipher
   * 
   * @param {string} secretKey - The secret key for encryption/decryption
   * @param {number} [iterations=1000] - Number of key derivation iterations
   */
  function AdvancedCipher(secretKey) {
    var iterations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1000;
    _classCallCheck(this, AdvancedCipher);
    if (!secretKey || secretKey.length < 12) {
      throw new Error('Secret key must be at least 12 characters long');
    }
    this._key = this._deriveKey(secretKey, iterations);
  }

  /**
   * Derives a cryptographically secure key using a more memory-efficient approach
   * 
   * @private
   * @param {string} secretKey - Original secret key
   * @param {number} iterations - Number of key derivation iterations
   * @returns {Uint8Array} Derived cryptographic key
   */
  return _createClass(AdvancedCipher, [{
    key: "_deriveKey",
    value: function _deriveKey(secretKey, iterations) {
      var encoder = new TextEncoder();
      new TextDecoder();
      var baseKey = encoder.encode(secretKey);

      // Limit key size to prevent exponential growth
      var MAX_KEY_LENGTH = 1024;
      var derivedKey = new Uint8Array(Math.min(baseKey.length, MAX_KEY_LENGTH));
      derivedKey.set(baseKey.slice(0, derivedKey.length));

      // More efficient key derivation
      for (var i = 0; i < iterations; i++) {
        // Use a fixed-size temporary buffer
        var tempKey = new Uint8Array(derivedKey.length);
        for (var j = 0; j < derivedKey.length; j++) {
          // Complex but controlled bit manipulation
          tempKey[j] = derivedKey[j] ^ (i + j) % 256 ^ (derivedKey[(j + 1) % derivedKey.length] << 3 | derivedKey[(j + 1) % derivedKey.length] >> 5);
        }
        derivedKey = tempKey;
      }
      return derivedKey;
    }

    /**
     * Encrypts the input text
     * 
     * @param {string} plaintext - Text to encrypt
     * @returns {string} Base64 encoded encrypted text
     */
  }, {
    key: "encrypt",
    value: function encrypt(plaintext) {
      if (!plaintext) return '';
      var encoder = new TextEncoder();
      var data = encoder.encode(plaintext);
      var encryptedBuffer = new Uint8Array(data.length);
      for (var i = 0; i < data.length; i++) {
        var keyByte = this._key[i % this._key.length];

        // Streamlined encryption with controlled bit manipulation
        encryptedBuffer[i] = data[i] ^ keyByte ^ i * 17 % 256 ^ (keyByte << 4 | keyByte >> 4);
      }
      return btoa(String.fromCharCode.apply(null, encryptedBuffer));
    }

    /**
     * Decrypts the input text
     * 
     * @param {string} ciphertext - Base64 encoded encrypted text
     * @returns {string} Decrypted plaintext
     */
  }, {
    key: "decrypt",
    value: function decrypt(ciphertext) {
      if (!ciphertext) return '';
      var encryptedBuffer = new Uint8Array(atob(ciphertext).split('').map(function (_char) {
        return _char.charCodeAt(0);
      }));
      var decryptedBuffer = new Uint8Array(encryptedBuffer.length);
      for (var i = 0; i < encryptedBuffer.length; i++) {
        var keyByte = this._key[i % this._key.length];

        // Reverse the encryption process precisely
        decryptedBuffer[i] = encryptedBuffer[i] ^ keyByte ^ i * 17 % 256 ^ (keyByte << 4 | keyByte >> 4);
      }
      var decoder = new TextDecoder();
      return decoder.decode(decryptedBuffer);
    }
  }]);
}();

export { AdvancedCipher as default };