PHP | hash_pbkdf2() Function

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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 = "zambiatek"; 
$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; 
?> 