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Hash-Funktionen
PHP Manual

# hash_pbkdf2

(PHP 5 >= 5.5.0)

hash_pbkdf2 — Generate a PBKDF2 key derivation of a supplied password

### Beschreibung

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

### Parameter-Liste

`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.

`iterations`

  The number of internal iterations to perform for the derivation.

`length`

  The length of the derived key to output. If 0, the length of the supplied algorithm is used.

`raw_output`

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

### Rückgabewerte

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.

### Fehler/Exceptions

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).

### Beispiele

Beispiel #1 hash_pbkdf2() example, basic usage

`<?php
$password = "password";
$salt = "salt";
$hash = hash_pbkdf2("sha256", $password, $salt, 1, 20);
echo $hash;
?>`

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

    120fb6cffcf8b32c43e7

### Anmerkungen

Achtung

The PBKDF2 method can be used for hashing passwords for storage (it is NIST approved for that use). However, it should be noted that `CRYPT_BLOWFISH` is better suited for password storage and should be used instead via crypt().

### Siehe auch

- crypt() - Einweg-String-Hashing
- hash() - Berechnet den Hash einer Nachricht
- hash_algos() - Gibt einer Liste der verfügbaren Hashing-Algorithmen zurück
- hash_init() - Initialisiert einen schrittweisen Hashing-Kontext
- hash_hmac() - Berechnet einen Hash mit Schlüssel unter Verwendung von HMAC
- hash_hmac_file() - Berechnet einen Hash einer Datei mit Schlüssel unter Verwendung von HMAC

hash_init
hash_update_file
Hash-Funktionen
PHP Manual