hash_pbkdf2

(PHP 5 >= 5.5.0, PHP 7)

Generate a PBKDF2 key derivation of a supplied password

string hash_pbkdf2 ( string $algo, string $password, string $salt, int $iterations [, int $length = 0 [, bool $raw_output = false ]] )

Parameters:

algo

Name of selected hashing algorithm (i.e. md5, sha256, haval160,4, etc..) See hash_algos() for a list of supported algorithms.

password

The password to use for the derivation.

salt

The salt to use for the derivation. This value should be generated randomly.

iterations

The number of internal iterations to perform for the derivation.

length

The length of the output string. If raw_output is TRUE this corresponds to the byte-length of the derived key, if raw_output is FALSE this corresponds to twice the byte-length of the derived key (as every byte of the key is returned as two hexits).

If 0 is passed, the entire output of the supplied algorithm is used.

raw_output

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.

Returns:

Returns a string containing the derived key as lowercase hexits unless raw_output is set to TRUE in which case the raw binary representation of the derived key is returned.

Exception:

An E_WARNING will be raised if the algorithm is unknown, the iterations parameter is less than or equal to 0, the length is less than 0 or the salt is too long (greater than INT_MAX - 4).

Examples:

hash_pbkdf2() example, basic usage

<?php
$password = "password";
$iterations = 1000;

// Generate a random IV using mcrypt_create_iv(),
// openssl_random_pseudo_bytes() or another suitable source of randomness
$salt = mcrypt_create_iv(16, MCRYPT_DEV_URANDOM);

$hash = hash_pbkdf2("sha256", $password, $salt, $iterations, 20);
echo $hash;
?>

The above example will output something similar to:

120fb6cffcf8b32c43e7