Required dependencies

# No runtime npm dependencies — crypto-js is self-contained.
# For TypeScript type definitions:
npm install --save-dev @types/crypto-js

No native build steps, no pod install, no Android linking required. The library uses the platform's native crypto module (Node.js require('crypto') or window.crypto) only for CSPRNG; all algorithm logic is pure JS.

Project setup

1. Copy the entire source/ directory into your project, e.g. src/vendor/crypto-js/.
2. The files use a global CryptoJS variable and are written as plain IIFE scripts. Load them in dependency order: core.js first, then any encoders/KDFs, then cipher infrastructure (cipher-core.js, mode files, padding files), then individual algorithms.
3. For a CommonJS / Node.js project the easiest approach is to install the npm package directly and import individual modules (each npm entry point wraps the source files in the correct order):

npm install crypto-js

4. For TypeScript add to tsconfig.json:

{
  "compilerOptions": {
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true
  }
}

5. If you are bundling the raw source/ files with webpack/Rollup, set up an alias so every algorithm can resolve core.js before it runs:

// webpack.config.js
resolve: {
  alias: {
    'cryptojs-core': path.resolve(__dirname, 'src/vendor/crypto-js/core.js')
  }
}

6. No environment variables are required.

Public API

CryptoJS.AES.encrypt / CryptoJS.AES.decrypt

import AES from 'crypto-js/aes';
import Utf8 from 'crypto-js/enc-utf8'; // re-exported from core

// encrypt
const cipherParams: CryptoJS.lib.CipherParams =
  AES.encrypt(message: string | WordArray, key: string | WordArray, cfg?: object): CryptoJS.lib.CipherParams;

// decrypt
const wordArray: CryptoJS.lib.WordArray =
  AES.decrypt(ciphertext: string | CipherParams, key: string | WordArray, cfg?: object): CryptoJS.lib.WordArray;

Use when you need symmetric encryption. When key is a plain string the library derives the actual key and IV via EVP KDF internally. Pass a WordArray key + explicit iv in cfg when you control key material directly.

Cipher.createEncryptor / Cipher.createDecryptor

// Defined on any BlockCipher subclass (AES, TripleDES, Blowfish, …)
CryptoJS.algo.AES.createEncryptor(key: WordArray, cfg?: { iv?: WordArray; mode?: object; padding?: object }): Cipher;
CryptoJS.algo.AES.createDecryptor(key: WordArray, cfg?: { iv?: WordArray; mode?: object; padding?: object }): Cipher;

Use these when you need a low-level, stateful cipher instance — for example when encrypting a stream in chunks by calling .process(chunk) repeatedly and finalising with .finalize().

CryptoJS.lib.WordArray

// Construction
CryptoJS.lib.WordArray.create(words?: number[], sigBytes?: number): WordArray;
// Encoding
wordArray.toString(encoder?: Encoder): string;   // default: Hex
// Concatenation
wordArray.concat(other: WordArray): WordArray;

The internal binary representation used everywhere. Convert to/from Base64, Hex, or Utf8 via the encoders in enc-base64.js, core.js.

Working examples

Scenario - AES-256 string encryption with a passphrase

A quick encrypt/decrypt cycle using a string passphrase (EVP KDF key derivation). Suitable for non-critical storage; prefer explicit key + IV for production.

import CryptoJS from 'crypto-js';

const passphrase = 'super-secret-passphrase';
const plaintext  = 'Hello, World!';

// Encrypt
const ciphertext: string = CryptoJS.AES.encrypt(plaintext, passphrase).toString();
console.log('Encrypted:', ciphertext);

// Decrypt
const bytes      = CryptoJS.AES.decrypt(ciphertext, passphrase);
const recovered  = bytes.toString(CryptoJS.enc.Utf8);
console.log('Decrypted:', recovered); // 'Hello, World!'

Scenario - AES-CBC with explicit key and IV

Use this when you supply your own key material (e.g. derived via PBKDF2 elsewhere).

import CryptoJS from 'crypto-js';

const key = CryptoJS.enc.Hex.parse('000102030405060708090a0b0c0d0e0f');
const iv  = CryptoJS.enc.Hex.parse('101112131415161718191a1b1c1d1e1f');

const encrypted = CryptoJS.AES.encrypt('sensitive data', key, {
  iv,
  mode:    CryptoJS.mode.CBC,
  padding: CryptoJS.pad.Pkcs7,
});

const decrypted = CryptoJS.AES.decrypt(encrypted, key, {
  iv,
  mode:    CryptoJS.mode.CBC,
  padding: CryptoJS.pad.Pkcs7,
});

console.log(decrypted.toString(CryptoJS.enc.Utf8)); // 'sensitive data'

Scenario - HMAC-SHA256 request signing

Sign an API request payload and encode the result as Base64 — a common pattern for webhook verification.

import hmacSHA256 from 'crypto-js/hmac-sha256';
import Base64     from 'crypto-js/enc-base64';

const privateKey = 'my-api-secret';
const payload    = JSON.stringify({ event: 'charge.succeeded', id: 42 });

const signature  = Base64.stringify(hmacSHA256(payload, privateKey));
console.log('X-Signature:', signature);
// Verify on the other end:
const expected   = Base64.stringify(hmacSHA256(payload, privateKey));
const valid      = signature === expected;

Scenario - PBKDF2 key derivation

Derive a cryptographic key from a user password before using it with AES.

import CryptoJS from 'crypto-js';

const password   = 'user-supplied-password';
const salt       = CryptoJS.lib.WordArray.random(128 / 8);

const key256     = CryptoJS.PBKDF2(password, salt, {
  keySize:    256 / 32,
  iterations: 100000,
});

const iv = CryptoJS.lib.WordArray.random(128 / 8);

const ciphertext = CryptoJS.AES.encrypt('secret', key256, { iv }).toString();
console.log(ciphertext);

File walkthrough

• core.js — Bootstraps the CryptoJS global, implements Base, WordArray, BufferedBlockAlgorithm, and the Hex/Latin1/Utf8 encoders. Must load before everything else.
• cipher-core.js — Defines the abstract Cipher, BlockCipher, StreamCipher hierarchy plus SerializableCipher and PasswordBasedCipher (which wrap algorithms with Base64 serialisation and EVP KDF).
• aes.js — Concrete AES implementation extending BlockCipher; exposes CryptoJS.AES.
• tripledes.js — DES and Triple-DES implementations with full PC1/PC2/S-box tables; exposes CryptoJS.TripleDES and CryptoJS.DES.
• blowfish.js — Blowfish block cipher with full P-array and S-box initialisation; exposes CryptoJS.Blowfish.
• rc4.js — RC4 stream cipher; exposes CryptoJS.RC4 and CryptoJS.RC4Drop.
• rabbit.js / rabbit-legacy.js — Rabbit stream cipher (current and legacy IV variants).
• md5.js, sha1.js, sha256.js, sha224.js, sha512.js, sha384.js, sha3.js, ripemd160.js — Standalone hash algorithms, each extending Hasher.
• hmac.js — HMAC construction; wraps any Hasher; used by the hmac-* entry points.
• pbkdf2.js — PBKDF2 implementation using HMAC-SHA1 internally.
• evpkdf.js — OpenSSL EVP_BytesToKey used internally by PasswordBasedCipher.
• enc-base64.js / enc-base64url.js / enc-utf16.js — Encoder objects with .stringify(wordArray) and .parse(string).
• lib-typedarrays.js — Patches WordArray to accept ArrayBuffer and typed arrays in .create().
• x64-core.js — 64-bit X64Word and X64WordArray types needed by SHA-512 and SHA-3.
• format-hex.js — Alternative CipherParams formatter that serialises ciphertext as hex instead of Base64.
• mode-cfb.js, mode-ctr.js, mode-ctr-gladman.js, mode-ecb.js, mode-ofb.js — Block cipher mode implementations passed as cfg.mode.
• pad-ansix923.js, pad-iso10126.js, pad-iso97971.js, pad-nopadding.js, pad-zeropadding.js — Padding scheme implementations passed as cfg.padding.

Common pitfalls and fixes

• Loading order with raw source files: cipher-core.js reads CryptoJS.enc.Base64 and CryptoJS.algo.EvpKDF, so enc-base64.js and evpkdf.js must be loaded before it. Fix: always start with core.js → encoders → evpkdf.js → cipher-core.js → modes → pads → algorithms.
• String passphrase vs WordArray key: When you pass a plain string as the key, the library silently invokes EVP KDF and embeds a salt in the output; passing a WordArray key skips KDF entirely and uses the bytes directly. Fix: be explicit — always use CryptoJS.enc.Hex.parse(...) when you have raw key bytes.
• WordArray.toString() defaults to Hex: Calling .toString() without an encoder returns a hex string, not UTF-8. Fix: always pass CryptoJS.enc.Utf8 (or Base64) explicitly when recovering plaintext.
• TypeScript default import: crypto-js ships CJS modules; with "esModuleInterop": false the named import import CryptoJS from 'crypto-js' fails. Fix: set "esModuleInterop": true or use import * as CryptoJS from 'crypto-js'.
• lib-typedarrays.js not loaded: Passing an ArrayBuffer to WordArray.create() throws unless lib-typedarrays.js has been loaded. Fix: require('crypto-js/lib-typedarrays') before any code that converts typed arrays.
• CTR mode counter endianness: mode-ctr.js (big-endian) and mode-ctr-gladman.js (little-endian) produce different ciphertexts for the same IV. Fix: pick one variant and use it consistently on both ends; default CryptoJS.mode.CTR is the big-endian version.

Vibe-coding prompt template

I have dropped the crypto-js 4.2.0 source files into `src/vendor/crypto-js/`
in my project. I also have USAGE.md (the integration guide) open.

Please help me integrate crypto-js into my project step by step:

1. Read USAGE.md and the source files in `src/vendor/crypto-js/` to understand
   the available algorithms and their real exports.

2. Install any missing dev dependencies (e.g. `@types/crypto-js`) and update
   `tsconfig.json` so TypeScript resolves the module correctly.

3. Implement the following feature using the real API from the source:
   [DESCRIBE YOUR USE CASE — e.g. "AES-CBC encryption of user data with a
   PBKDF2-derived key, returning a Base64-encoded ciphertext string"]

4. Show the full import statements referencing `crypto-js` (or the vendor path),
   the implementation, and a brief test that encrypts and then decrypts to
   verify round-trip correctness.

5. Point out any loading-order or ESM/CJS interop issues specific to my
   project setup and how to fix them.

Upstream package: user@example.com
Integration guide: USAGE.md
Source location: src/vendor/crypto-js/

License and credit

CryptoJS is released under the MIT License. See source/LICENSE if present, or the npm package page for the full license text. Upstream repository: https://github.com/brix/crypto-js. Note that the upstream project is discontinued; consider migrating to the Node.js built-in crypto module or the Web Crypto API for new projects.

This product’s unique contribution is clean room implementation of valuable code block into AVCP compatible standard.

完全なインストールガイドと統合プロンプトは購入後に解放されます。

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