Node.js crypto.checkPrimeSync() Function

The checkPrimeSync() is  an inbuilt application programming interface of class Crypto within crypto module which is used to check if the passed buffer object is prime or not.

Syntax:

const crypto.checkPrimeSync(candidate[, options])

Parameters: This function takes the following arguments as the parameter.

• candidate: This is an object of  buffer representing a sequence of big endian octets of arbitrary length.
• option: The option which will alter the operation of this function.

Return Value: This function returns true if and only if the candidate is a prime.

Example 1:

index.js

// Node.js program to demonstrate the
// crypto.checkPrimeSync() function

// Importing crypto module
const crypto = require('crypto')

// creating and initializing new
// ArrayBuffer object
const buffer = new ArrayBuffer(8)

// checking if the buffer object is prime or not
// by using checkPrimeSync() method
const val = crypto.checkPrimeSync(buffer)

//display the result
if(val)
console.log("candidate is a prime")
else
console.log("candidate is not a prime")

Run the index.js file using the following command:

node index.js

Output:

candidate is not a prime

Example 2:

index.js

// Node.js program to demonstrate the
// crypto.checkPrimeSync() function

// Importing crypto module
const crypto = require('crypto')

// creating and initializing new
// BigInt object
const buffer = BigInt("0o377777777777777777")

// checking if the buffer object is prime or not
// by using checkPrimeSync() method
const val = crypto.checkPrimeSync(buffer)

//display the result
if(val)
console.log("candidate is a prime")
else
console.log("candidate is not a prime")

Run the index.js file using the following command:

node index.js

Output:

candidate is not a prime

Reference: https://nodejs.org/dist/latest-v15.x/docs/api/crypto.html#crypto_crypto_checkprimesync_candidate_options