The hash_pbkdf2() function is an inbuilt function in PHP which is used to generate a PBKDF2 key derivation of a supplied password.
Syntax:
string hash_pbkdf2( $algo, $pass, $salt, $itr, $len, $raw_opt )
Parameters: This function accept six parameters as mention above and describe below.
- $algo: It is the required parameter which specifies the selected hashing algorithm (like- “md5”, “sha256”, “sha1”).
- $pass: This parameter is used to specify the password to use for the derivation.
- $salt: This parameter is used for the derivation and the value should be generated randomly.
- $itr: This parameter count the number of internal iterations.
- $len: This parameter is used to hold the length of the output string.
- $raw_opt: If this parameter set to True then its output will be raw binary data and if this parameter set to false then output will be lowercase hexits.
Return Value: This function returns the string containing the calculated message digest as lowercase hexits.
Below programs illustrate the hash_pbkdf2() function in PHP:
Program 1:
<?php $gfg = "neveropen"; $iterations = 142; // Generate a random IV using // openssl_random_pseudo_bytes() // random_bytes() or another // suitable source of randomness. $salt = openssl_random_pseudo_bytes(16); // Using hash_pbkdf2 function $hash = hash_pbkdf2("md5", $gfg, $salt, $iterations, 30); // Display result echo $hash; ?> |
Output:
f0ebbbf59869d76f946c4b15340761
Program 2:
<?php $gfg = "Contribute1234"; $iterations = 100; // Generate a random IV using // openssl_random_pseudo_bytes() // random_bytes() or another // suitable source of randomness. $salt = openssl_random_pseudo_bytes(8); // Using hash_pbkdf2 function $hash = hash_pbkdf2("md5", $gfg, $salt, $iterations, 20, false); // Display result echo $hash; ?> |
Output:
715b385158045923923c
Reference: http://php.net/manual/en/function.hash-pbkdf2.php
