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Node crypto.createCipheriv() Method

Node.js crypto.createDecipheriv() Method

Node.js crypto.getDiffieHellman() Method

The crypto.createCipheriv() method is an inbuilt application programming interface of the crypto module which is used to create a Cipher object, with the stated algorithm, key, and initialization vector (iv).
Syntax: 

crypto.createCipheriv( algorithm, key, iv, options )

Parameters: This method accepts four parameters as mentioned above and described below:  

  • algorithm: It is a string-type value that dependent on OpenSSL. The examples are aes192, aes256, etc.
  • key: It is the raw key that is used by the algorithm and iv.
  • iv: It is an initialization vector that must be uncertain and very unique. However, an ideal iv will be cryptographically random. It don’t need to be secret.
  • options: It is an optional parameter that is used to control stream behavior. It is optional except when a cipher is used in CCM or OCB mode(e.g. ‘aes-128-ccm’).

Return Value: It returns Cipher object.

Example 1: Below examples illustrate the use of crypto.createCipheriv() method in NodeJs:

Javascript




// Node.js program to demonstrate the    
// crypto.createCipheriv() method
 
// Includes crypto module
const crypto = require('crypto');
 
// Defining algorithm
const algorithm = 'aes-256-cbc';
 
// Defining key
const key = crypto.randomBytes(32);
 
// Defining iv
const iv = crypto.randomBytes(16);
 
// An encrypt function
function encrypt(text) {
 
    // Creating Cipheriv with its parameter
    let cipher = crypto.createCipheriv(
        'aes-256-cbc', Buffer.from(key), iv);
 
    // Updating text
    let encrypted = cipher.update(text);
 
    // Using concatenation
    encrypted = Buffer.concat([encrypted, cipher.final()]);
 
    // Returning iv and encrypted data
    return {
        iv: iv.toString('hex'),
        encryptedData: encrypted.toString('hex')
    };
}
 
// Displays output
var output = encrypt("w3wiki");
console.log(output);
 






                        









													
													
												

												
												

													
													
Output: 

													
													
												

												
												

													
													
{ iv: 'fb1f4b0a7daaada6cae678df32fad0f0',
  encryptedData: '41aad2618892aa3d1850d336ad15b50e' }

													
													
												

												
												

													
													
Example 2: Below examples illustrate the use of crypto.createCipheriv() method in NodeJs:

													
													
												

												
												

													
													




Javascript















                                    




                                    

                                    




                                    




                                    

                                    

                                    
                                




















// Node.js program to demonstrate the     


// crypto.createCipheriv() method


 


// Includes crypto module


const crypto = require('crypto');


 


// Defining algorithm


const algorithm = 'aes-192-cbc';


 


// Defining password


const password = 'bncaskdbvasbvlaslslasfhj';


 


// Defining key


const key = crypto.scryptSync(password, 'GfG', 24);


 


// Defininf iv


const iv = Buffer.alloc(16, 0);


 


// Creating cipher


const cipher = crypto.createCipheriv(algorithm, key, iv);


 


// Declaring encrypted


let encrypted = '';


 


// Reading data


cipher.on('readable', () => {


    let chunk;


    while (null !== (chunk = cipher.read())) {


        encrypted += chunk.toString('base64');


    }


});


 


// Handling end event


cipher.on('end', () => {


    console.log(encrypted);


});


 


// Writing data


cipher.write('CS-Portal');


cipher.end();


console.log("done");



















                        







                        









													
													
												

												
												

													
													
Output: 

													
													
												

												
												

													
													
done
MfHwhG/WPv+TIbG/qM78qA==

													
													
												

												
												

													
													
We have a Cheat Sheet on Nodejs crypto methods where we covered all the crypto methods to check those please go through Node Crypto Module Complete Reference this article.

													
													
												

												
												

													
													

													
													
												

												
												

													
													

													
													
												

												
												

													
													

													
													
												

												
													
											

											
										

									

									

										
										
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												Node.js crypto.createDecipheriv() Method
											
											
										

										

											
											
												Node.js crypto.getDiffieHellman() Method