SDK de Steganography Online Codec para JavaScript y NPM

Steganographic Online Codec te permite ocultar un mensaje cifrado con contraseña dentro de imágenes y fotos utilizando el algoritmo de cifrado AES con una clave derivada de PBKDF2 de 256 bits.

Puedes usarlo de forma gratuita en:

https://www.pelock.com/products/steganography-online-codec

Este SDK proporciona acceso programático al codec y a sus funciones de codificación y decodificación a través de una interfaz WebAPI.

¿Qué es la esteganografía y cómo funciona?

La esteganografía es un término que describe el arte y la ciencia de ocultar información incrustando mensajes dentro de otros archivos de imagen aparentemente inofensivos.

En este caso, los bits individuales del mensaje oculto cifrado se guardan como los bits menos significativos (LSB) en los componentes de color RGB de los píxeles de la imagen seleccionada.

Steganography Online Codec - Hide Message in Image

Con nuestro codificador esteganográfico podrás ocultar cualquier mensaje de texto en la imagen de forma segura y enviarlo sin levantar sospechas. Solo será posible leer el mensaje después de proporcionar una contraseña de descifrado válida.

Instalación

La forma preferida de instalación del SDK de Web API es a través de NPM (Node Package Manager).

Ejecuta:

npm i steganography-online-codec

O añade esta entrada:

  "dependencies": {
    "steganography-online-codec": "latest"
  },

directamente a tu package.json en la sección dependencies.

El paquete de instalación está disponible en https://www.npmjs.com/package/steganography-online-codec

Paquetes para otros lenguajes de programación

Los paquetes de instalación se han subido a los repositorios de varios lenguajes de programación populares y sus códigos fuente se han publicado en GitHub:

Uso alternativo

Si no quieres usar el módulo de Python, puedes importar directamente desde el archivo:

from pelock.steganography_online_codec import *

Cómo ocultar un mensaje secreto dentro de un archivo de imagen

"use strict";

/******************************************************************************
 *
 * Steganography Online Codec WebApi interface usage example.
 *
 * In this example shows how to hide an encrypted secret message in an image file.
 *
 * Version      : v1.00
 * Language     : JavaScript
 * Author       : Bartosz Wójcik (original example)
 * Project      : https://www.pelock.com/products/steganography-online-codec
 * Homepage     : https://www.pelock.com
 *
 * @link https://www.pelock.com/products/steganography-online-codec
 * @copyright Copyright (c) 2020-2025 PELock LLC
 * @license Apache-2.0
 *
/*****************************************************************************/

// include Steganography Online Codec module
import { SteganographyOnlineCodec, Errors } from 'steganography-online-codec';
// or if tested locally use:
//import { SteganographyOnlineCodec, Errors } from '../src/SteganographyOnlineCodec.mjs';

// create Steganography Online Codec class instance (we are using our activation key)
const mySteganographyOnlineCodec = new SteganographyOnlineCodec('YOUR-WEB-API-KEY');

// encode a hidden message (encrypted with your password) within an image file
(async () => {

	const inputFile = 'input_file.jpg';
	const secretMessage = 'Secret message';
	const password = 'Pa$$word';
	const outputFile = 'output_file_with_hidden_secret_message.png';

	try {
		const result = await mySteganographyOnlineCodec.encode(inputFile, secretMessage, password, outputFile);

		// result object holds the encoding results as well as other information
		console.log('Secret messaged encoded and saved to the output PNG file.');
	} catch (err) {
		console.error('Encoding failed:', err.error_message || err.message || String(err));
	}
})();

Ejemplo más complejo con mejor explicación y comprobación adecuada de códigos de error

"use strict";

/******************************************************************************
 *
 * Steganography Online Codec WebApi interface usage example.
 *
 * In this example, we will see how to hide an encrypted message in an
 * image file using our codec.
 *
 * Version      : v1.00
 * Language     : JavaScript
 * Author       : Bartosz Wójcik
 * Project      : https://www.pelock.com/products/steganography-online-codec
 * Homepage     : https://www.pelock.com
 *
 * @link https://www.pelock.com/products/steganography-online-codec
 * @copyright Copyright (c) 2020-2025 PELock LLC
 * @license Apache-2.0
 *
 /*****************************************************************************/

// include Steganography Online Codec module
import { SteganographyOnlineCodec, Errors } from 'steganography-online-codec';
// or if tested locally use:
//import { SteganographyOnlineCodec, Errors } from '../src/SteganographyOnlineCodec.mjs';


// create Steganography Online Codec class instance (we are using our activation key)
const mySteganographyOnlineCodec = new SteganographyOnlineCodec('YOUR-WEB-API-KEY');

// encode a hidden message within the source image file
(async () => {
	// full version image size limit is set to 10 MB (demo 50 kB max)
	// supported image formats are PNG, JPG, GIF, BMP, WBMP, GD2, AVIF, WEBP (mail me for more)
	const inputFilePath = 'input_file.webp';

	// full version message size is unlimited (demo 16 chars max)
	const secretMessage = 'Secret message';

	// full version password length is 128 characters max (demo 8 chars max)
	const password = 'Pa$$word';

	// where to save encoded image with the secret message
	const outputFilePath = 'output_file_with_hidden_secret_message.png';

	try {
		// encode a hidden message (encrypted with your password) within an image file
		const result = await mySteganographyOnlineCodec.encode(inputFilePath, secretMessage, password, outputFilePath);

		// result object holds the encoding results as well as other information
		const versionType = result.license && result.license.activationStatus ? 'full' : 'demo';
		console.log(`You are running in ${versionType} version`);

		console.log(`Secret messaged encoded and saved to ${outputFilePath}`);
		if (result.license && result.license.usagesCount !== undefined) {
			console.log(`Remaining number of usage credits - ${result.license.usagesCount}`);
		}
	} catch (err) {
		const errorCode = err.error;

		switch (errorCode) {
			case Errors.INVALID_INPUT:
				console.log(`Invalid input file ${inputFilePath} or file doesn't exist`);
				break;
			case Errors.MESSAGE_TOO_LONG:
				console.log('Message is too long for the provided image file, use larger file');
				break;
			case Errors.IMAGE_TOO_BIG:
				console.log(`Image file is too big, current limit is set to ${err.raw?.limits?.maxFileSize ?? 'unknown'}`);
				break;
			case Errors.LIMIT_MESSAGE:
				console.log(`Message is too long, current limit is set to ${err.raw?.limits?.maxMessageLen ?? 'unknown'}`);
				break;
			case Errors.LIMIT_PASSWORD:
				console.log(`Password is too long, current limit is set to ${err.raw?.limits?.maxPasswordLen ?? 'unknown'}`);
				break;
			case Errors.INVALID_PASSWORD:
				console.log('Invalid password');
				break;
			default:
				console.log(`An error occurred: ${err.error_message ?? `Error code ${errorCode}`}`);
		}
	}
})();

Cómo extraer el mensaje secreto codificado del archivo de imagen

"use strict";

/******************************************************************************
 *
 * Steganography Online Codec WebApi interface usage example.
 *
 * In this example, we will see how to extract a previously encrypted & hidden
 * secret message from an image file.
 *
 * Version      : v1.00
 * Language     : JavaScript
 * Author       : Bartosz Wójcik
 * Project      : https://www.pelock.com/products/steganography-online-codec
 * Homepage     : https://www.pelock.com
 *
 * @link https://www.pelock.com/products/steganography-online-codec
 * @copyright Copyright (c) 2020-2025 PELock LLC
 * @license Apache-2.0
 *
 /*****************************************************************************/

// include Steganography Online Codec module
import { SteganographyOnlineCodec, Errors } from 'steganography-online-codec';
// or if tested locally use:
//import { SteganographyOnlineCodec, Errors } from '../src/SteganographyOnlineCodec.mjs';

// create Steganography Online Codec class instance (we are using our activation key)
const mySteganographyOnlineCodec = new SteganographyOnlineCodec('YOUR-WEB-API-KEY');

// extract a hidden message from the previously encoded image file
(async () => {
	// full version image size limit is set to 10 MB (demo 50 kB max)
	// supported image format is PNG and only PNG!
	const inputFilePath = 'output_file_with_hidden_secret_message.png';

	// full version password length is 128 characters max (demo 8 chars max)
	const password = 'Pa$$word';

	try {
		// extract a hidden message from the image (PNG files only)
		const result = await mySteganographyOnlineCodec.decode(inputFilePath, password);

		// result object holds the decoding results as well as other information
		console.log(`You are running in ${result.license?.activationStatus ? 'full' : 'demo'} version`);

		console.log(`Secret message is "${result.message}"`);

		if (result.license && result.license.usagesCount !== undefined) {
			console.log(`Remaining number of usage credits - ${result.license.usagesCount}`);
		}
	} catch (err) {
		switch (err.error) {
			case Errors.INVALID_INPUT:
				console.log(`Invalid input file ${inputFilePath} or file doesn't exist`);
				break;
			case Errors.IMAGE_TOO_BIG:
				console.log(`Image file is too big, current limit is set to ${err.raw?.limits?.maxFileSize ?? 'unknown'}`);
				break;
			case Errors.LIMIT_MESSAGE:
				console.log(`Extracted message is too long, current limit is set to ${err.raw?.limits?.maxMessageLen ?? 'unknown'}`);
				break;
			case Errors.LIMIT_PASSWORD:
				console.log(`Password is too long, current limit is set to ${err.raw?.limits?.maxPasswordLen ?? 'unknown'}`);
				break;
			case Errors.INVALID_PASSWORD:
				console.log('Invalid password');
				break;
			default:
				console.log(`An error occurred: ${err.error_message ?? String(err)}`);
		}
	}
})();

Cómo comprobar el estado de la clave de licencia y los límites actuales

"use strict";

/******************************************************************************
 *
 * Steganography Online Codec WebApi interface usage example.
 *
 * In this example we will verify our activation key status.
 *
 * Version      : v1.00
 * Language     : JavaScript
 * Author       : Bartosz Wójcik
 * Project      : https://www.pelock.com/products/steganography-online-codec
 * Homepage     : https://www.pelock.com
 *
 * @link https://www.pelock.com/products/steganography-online-codec
 * @copyright Copyright (c) 2020-2025 PELock LLC
 * @license Apache-2.0
 *
 /*****************************************************************************/

// include Steganography Online Codec module
import { SteganographyOnlineCodec, Errors } from 'steganography-online-codec';
// or if tested locally use:
//import { SteganographyOnlineCodec, Errors } from '../src/SteganographyOnlineCodec.mjs';

// create Steganography Online Codec class instance (we are using our activation key)
const mySteganographyOnlineCodec = new SteganographyOnlineCodec('YOUR-WEB-API-KEY');

// login to the service
(async () => {
	try {
		const result = await mySteganographyOnlineCodec.login();

		// result object holds the information about the license & current limits
		const versionType = result.license && result.license.activationStatus ? 'full' : 'demo';
		console.log(`You are running in ${versionType} version`);

		// information about the current license
		if (result.license && result.license.activationStatus) {
			console.log(`Registered for - ${result.license.userName}`);
			const licenseType = result.license.type === 0 ? 'personal' : 'company';
			console.log(`License type - ${licenseType}`);
			console.log(`Total number of purchased usage credits - ${result.license.usagesTotal}`);
			console.log(`Remaining number of usage credits - ${result.license.usagesCount}`);
		}

		// current limits (different for DEMO and FULL versions)
		if (result.limits) {
			console.log(`Max. password length - ${result.limits.maxPasswordLen}`);
			const msgLen = result.limits.maxMessageLen === -1 ? 'unlimited' : result.limits.maxMessageLen;
			console.log(`Max. message length - ${msgLen}`);
			console.log(`Max. input image file size - ${mySteganographyOnlineCodec.convert_size(result.limits.maxFileSize)}`);
		}
	} catch (err) {
		console.error(`Login failed: ${err.error_message || String(err)}`);
	}
})();

¿Tienes preguntas?

Si estás interesado en la Web API de Steganography Online Codec o tienes alguna pregunta sobre los paquetes SDK, cuestiones técnicas o si algo no está claro, por favor contáctame. Estaré encantado de responder a todas tus preguntas.

Bartosz Wójcik

Visita mi sitio en — https://www.pelock.com
X — https://x.com/PELock
GitHub — https://github.com/PELock

Python	Ejecuta `pip install steganography-online-codec`	PyPI	Fuentes
JavaScript, TypeScript	Ejecuta `npm i steganography-online-codec` o añade `"steganography-online-codec": "latest"` bajo `dependencies` en `package.json`	NPM	Fuentes
Rust	Ejecuta `cargo add steganography-online-codec` o añade `steganography-online-codec = "1"` a `Cargo.toml` (opcional: `git` / `path` para compilaciones no publicadas o vendidas)	crates.io	Fuentes

Steganography-Online-Codec-JavaScript

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