Node.js crypto.createSign() Method
The crypto.createSign() method is used to create a Sign object that uses the stated algorithm. Moreover, you can use crypto.getHashes() method to access the names of all the available digest algorithms.
Syntax:
crypto.createSign( algorithm, options )
Parameters: This method accept two parameters as mentioned above and described below:
- algorithm: It is a string type value. A Sign instance can be created by applying the name of a signature algorithms, like ‘RSA-SHA256’, in place of a digest algorithms.
- options: It is an optional parameter that is used to control stream behavior. It returns an object.
Return Value: It returns Sign object.
Below examples illustrate the use of crypto.createSign() method in Node.js:
Example 1:
// Node.js program to demonstrate the // crypto.createSign() method // Including crypto module const crypto = require( 'crypto' ); // Defining the algorithm to be used const algo = 'RSA-SHA256' ; // Creating Sign object const sign = crypto.createSign(algo); // Output console.log(sign); |
Output:
Sign { _handle: {}, _writableState: WritableState { objectMode: false, highWaterMark: 16384, finalCalled: false, needDrain: false, ending: false, ended: false, finished: false, destroyed: false, decodeStrings: true, defaultEncoding: 'utf8', length: 0, writing: false, corked: 0, sync: true, bufferProcessing: false, onwrite: [Function: bound onwrite], writecb: null, writelen: 0, bufferedRequest: null, lastBufferedRequest: null, pendingcb: 0, prefinished: false, errorEmitted: false, emitClose: true, autoDestroy: false, bufferedRequestCount: 0, corkedRequestsFree: { next: null, entry: null, finish: [Function: bound onCorkedFinish] } }, writable: true, domain: null, _events: [Object: null prototype] {}, _eventsCount: 0, _maxListeners: undefined }
Example 2:
// Node.js program to demonstrate the // crypto.createSign() method // Including crypto module const crypto = require( 'crypto' ); // Defining the algorithm to be used const algo = 'SHA256' ; // Creating Sign object const sign = crypto.createSign(algo); // Prints true sign.write( 'some data to sign' ); |
Output:
true
Reference: https://nodejs.org/api/crypto.html#crypto_crypto_createsign_algorithm_options
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