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Node.js crypto.checkPrime() Function

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

Syntax:

const crypto.checkPrime(candidate[, options, [callback]])

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

  • candidate: It is an object of buffer representing a sequence of big endian octets of arbitrary length.
  • option: Any other option which will alter the operation of this API.
  • callback: It is the callback function that is executed and is passed as an optional parameter.

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

Example 1:

index.js




// Node.js program to demonstrate the  
// crypto.checkPrime() api
  
// Importing crypto module
const crypto = require('crypto')
  
// Creating and ini
tializing new 
// ArrayBuffer object
const buffer = new ArrayBuffer(8)
  
// Checking if the buffer object is prime or not
// by using checkPrime() method
crypto.checkPrime(buffer, (err, val) => {
  
    // Checking if any error is found
    if (err) throw new Error('Uh oh!');
  
    // 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.checkPrime() api
  
// Importing crypto module
const crypto = require('crypto')
  
// Creating and initializing new 
// ArrayBuffer object
const buffer = BigInt("0o377777777777777777")
  
// Checking if the buffer object is prime or not
// by using checkPrime() method
crypto.checkPrime(buffer, (err, val) => {
  
    // Checking if any error is found
    if (err) throw new Error('Uh oh!');
  
    // 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_checkprime_candidate_options_callback



Last Updated : 30 Jul, 2021
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