crypto/README.md

Encryption and Decryption using Node.js

This code provides a simple way to encrypt and decrypt text using the Advanced Encryption Standard (AES) algorithm in Cipher Block Chaining (CBC) mode with Node.js's crypto module.

Pre requisites

Before using this code, make sure you have Node.js installed on your system.

Usage

1. Import the Module

   First, import the encrypt and decrypt functions from the module in your Node.js project.

   const crypto = require('./crypto');
   

2. Set Encryption Parameters

   Modify the following constants in your code with your own values:

   • CHAVE: A 32-character encryption key.
   • IV: A 16-character initialization vector.
   • ALGORITMO: The encryption algorithm, which is set to "aes-256-cbc" by default. You can change it if needed.
   • METODO_CRIPTOGRAFIA and METODO_DESCRIPTOGRAFIA: The methods used for encoding the output. They are set to 'hex' by default.

3. Encrypt Text

   To encrypt a piece of text, call the encrypt function and pass the text as a parameter.

   const textToEncrypt = 'This is a secret message';
   const encryptedText = crypto.encrypt(textToEncrypt);
   

4. Decrypt Text

   To decrypt the encrypted text, call the decrypt function and pass the encrypted text as a parameter.

   const decryptedText = crypto.decrypt(encryptedText);
   

5. Complete Example

   Here's a complete example of how to use the code:

   const crypto = require('./crypto');
   
   const CHAVE = 'bf3c199c2470cb477d907b1e0917c17e';
   const IV = '5183666c72eec9e4';
   
   // Encrypt
   const textToEncrypt = 'This is a secret message';
   const encryptedText = crypto.encrypt(textToEncrypt);
   console.log('Encrypted:', encryptedText);
   
   // Decrypt
   const decryptedText = crypto.decrypt(encryptedText);
   console.log('Decrypted:', decryptedText);
   

Security Note

Make sure to keep your encryption key (CHAVE) and initialization vector (IV) secret and secure, as they are critical for the security of your encrypted data.

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Feel free to replace the placeholders with your actual values and use this README as a guide to integrate encryption and decryption into your Node.js project.