Node.js cipher.update() Method Last Updated : 16 Sep, 2021 Comments Improve Suggest changes Like Article Like Report The cipher.update() method is an inbuilt application programming interface of class Cipher within crypto module which is used to update the cipher with data according to the given encoding format. Syntax: const cipher.update(data[, inputEncoding][, outputEncoding]) Parameters: This method takes the following parameter: data: It is used to update the cipher by new content.inputEncoding: Input encoding format.outputEncoding: Output encoding format. Return Value: This method returns the object of buffer containing the cipher value. Example 1: Filename: index.js JavaScript // Node.js program to demonstrate the // cipher.update() method // Importing crypto module const crypto = require('crypto'); // Creating and initializing algorithm and password const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Getting key for the cipher object const key = crypto.scryptSync(password, 'salt', 24); // Creating and initializing the static iv const iv = Buffer.alloc(16, 0); // Creating and initializing the cipher object const cipher = crypto.createCipheriv(algorithm, key, iv); // Updating the cipher with the data // by using update() method let encrypted = cipher.update( 'some clear text data', 'utf8', 'hex'); // Getting the buffer data of cipher encrypted += cipher.final('hex'); // Display the result console.log(encrypted); Output: e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa Example 2: Filename: index.js JavaScript // Node.js program to demonstrate the // cipher.update() method // Importing crypto module const crypto = require('crypto'); // Creating and initializing algorithm and password const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Getting key for cipher object crypto.scrypt(password, 'salt', 24, { N: 512 }, (err, key) => { if (err) throw err; // Creating and initializing the static iv const iv = Buffer.alloc(16, 0); // Creating and initializing the cipher object const cipher = crypto .createCipheriv(algorithm, key, iv); // Updating the cipher with the data // by using update() method let encrypted = cipher.update( 'some clear text data', 'utf8', 'hex'); // Getting the buffer data of cipher encrypted += cipher.final('hex'); // Display the result console.log(encrypted); }); Output: 5850288b1848440f0c410400403f7b456293229b5231c17d2b83b602f252714b Run the index.js file using the following command: node index.js Reference: https://nodejs.org/dist/latest-v12.x/docs/api/crypto.html#crypto_cipher_update_data_inputencoding_outputencoding Comment More infoAdvertise with us Next Article Node.js crypto.getCiphers() Method rohitprasad3 Follow Improve Article Tags : Web Technologies Node.js Node.js-Methods Node.js-crypto-module Similar Reads Node.js cipher.final() Method The cipher.final() method in Node.js is used to signal to the cipher object that the encryption or decryption process is complete. 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