Node.js decipher.update() Method
The decipher.update() method is an inbuilt application programming interface of class Decipher within crypto module which is used to update the decipher with the data according to the given encoding format.
Syntax:
const decipher.update(data[, inputEncoding][, outputEncoding])
Parameters: This method takes the following parameter:
- data: It is used to update the decipher by new content.
- inputEncoding: Input encoding format.
- outputEncoding: Output encoding format.
Return Value: This method does not return any value.
Example 1: Filename: index.js
Javascript
// Node.js program to demonstrate the // decipher.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 decipher object const key = crypto.scryptSync(password, 'salt' , 24); // Creating and initializing the static iv const iv = Buffer.alloc(16, 0); // Creating and initializing the decipher object const decipher = crypto.createDecipheriv(algorithm, key, iv); // Encrypted using same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa' ; // Updating the data into decipher object let decrypted = decipher.update(encrypted, 'hex' , 'utf8' ); // Getting decrypted data decrypted += decipher.final( 'utf8' ); // Display the result console.log( "buffer :- " + decrypted); |
Output:
buffer :- some clear text data
Example 2: Filename: index.js
Javascript
// Node.js program to demonstrate the // decipher.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 decipher object const decipher = crypto .createDecipheriv(algorithm, key, iv); // Encrypted using same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa' ; // updating the data into decipher object const decrypted = decipher.update(encrypted, 'hex' , 'utf8' ); console.log( "buffer :- " + decipher); }); |
Output:
buffer :- [object Object]
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_decipher_update_data_inputencoding_outputencoding