Node.js crypto.hkdf() Function
Last Updated :
08 Feb, 2023
The crypto.hkdf() is an inbuilt application programming interface of class Crypto within crypto module which is used to derive a key of the particular length.
Syntax:
const crypto.hkdf(digest, key, salt, info, keylen, callback)
Parameters: This function takes the following arguments as the parameter.
- digest: It’s a string of digest algorithm.
- key: It is the secret key
- salt: It contains important values.
- info: It contains extra information.
- keylen: It’s the length of the key to be generated.
- callback: It is for further operations.
Return Value: This function returns a derived key of the particular length.
Example 1:
index.js
const crypto = require( 'crypto' )
const val = crypto.hkdf( 'sha512' , 'key' , 'salt' ,
'info' , 64, (err, derivedKey) => {
if (err) throw err;
console.log(Buffer.from(derivedKey).toString( 'hex' ));
});
|
Run the index.js file using the following command.
node index.js
Output:
24156e2c35525baaf3d0fbb92b734c8032a110a3f12e25
96e441e1924870d84c3a500652a723738024432451046fd237e
fad8392fb686c5277a59e0105391653
Example 2:
index.js
const crypto = require( 'crypto' )
const key = new ArrayBuffer(8);
const val = crypto.hkdf( 'sha512' , key, 'salt' ,
'info' , 32, (err, derivedKey) => {
if (err) throw err;
console.log(Buffer.from(derivedKey).toString( 'hex' ));
});
|
Run the index.js file using the following command.
node index.js
Output:
bb105ac3235f285bd53b68cb95bf78c7fe5f3
a7924ac64d291f68ba2bd0430e1
Reference: https://nodejs.org/dist/latest-v15.x/docs/api/crypto.html#crypto_crypto_hkdf_digest_key_salt_info_keylen_callback
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