Node.js decipher.final() Method
The decipher.final() method is an inbuilt application programming interface of class Decipher within crypto module which is used to return the buffer containing the value of decipher object.
Syntax:
const decipher.final([outputEncoding])
Parameters: This method takes the output encoding as a parameter.
Return Value: This method return the object of buffer containing the deciphered value.
Example 1: In this example, we will use decipher.final() method
Filename: index.js
Javascript
// Node.js program to demonstrate the // decipher.final() 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 to the decipher let decrypted = decipher.update(encrypted, 'hex' , 'utf8' ); // Deciphering data by using // final() method decrypted += decipher.final( 'utf8' ); // Display the result console.log(decrypted); |
Output:
some clear text data
Example 2: In this example, we will use decipher.final() method
Filename: index.js
JavaScript
// Node.js program to demonstrate the // decipher.final() 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' ; // Creating and initializing empty buffer let buf = []; // Updating the data to the decipher let decrypted = decipher.update(encrypted, 'hex' , 'utf8' ); // Pushing the updated data into buffer buf.push(decrypted); // Pushing decrypted data into buffer buf.push(decipher.final( 'utf8' )); // Display the result console.log(buf.join( ' ' )); |
Output:
some clear text data
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_final_outputencoding
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