openssl_pbkdf2

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

openssl_pbkdf2 — Generates a PKCS5 v2 PBKDF2 string

Descrizione

openssl_pbkdf2(
    string $password,
    string $salt,
    int $key_length,
    int $iterations,
    string $digest_algo = "sha1"
): string|false

openssl_pbkdf2() computes PBKDF2 (Password-Based Key Derivation Function 2), a key derivation function defined in PKCS5 v2.

Elenco dei parametri

password: Password from which the derived key is generated.
salt: PBKDF2 recommends a crytographic salt of at least 64 bits (8 bytes).
key_length: Length of desired output key.
iterations: The number of iterations desired. » NIST recommends at least 10,000.
digest_algo: Optional hash or digest algorithm from openssl_get_md_methods(). Defaults to SHA-1.

Valori restituiti

Returns raw binary string o false in caso di fallimento.

Esempi

Example #1 openssl_pbkdf2() example

<?php
$password = 'password';
$salt = openssl_random_pseudo_bytes(16);
$keyLength = 20;
$iterations = 600000;
$generated_key = openssl_pbkdf2($password, $salt, $keyLength, $iterations, 'sha256');
echo bin2hex($generated_key)."\n";
echo base64_encode($generated_key)."\n";
?>

Vedere anche:

hash_pbkdf2() - Generate a PBKDF2 key derivation of a supplied password
openssl_get_md_methods() - Gets available digest methods

add a note

User Contributed Notes 1 note

down

McGlockenshire ¶

10 years ago


Despite the manual claiming that this is available in PHP 5.5 and above, this function wasn't made available in my local install.

I expect that having a prehistoric OpenSSL library version installed is the likely culprit.

If you're using PHP 5.5 and don't have this function available in your OpenSSL extension, look at the functionally equivalent hash_pbkdf2 function instead.

add a note