openssl_pbkdf2
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
openssl_pbkdf2 — Generates a PKCS5 v2 PBKDF2 string
Description
openssl_pbkdf2(
string
string
int
int
string
): string|false
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.
Parameters
-
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.
Return Values
Returns raw binary string or false on failure.
Examples
Example #1 openssl_pbkdf2() example
<?php
$password = 'yOuR-pAs5w0rd-hERe';
$salt = openssl_random_pseudo_bytes(12);
$keyLength = 40;
$iterations = 10000;
$generated_key = openssl_pbkdf2($password, $salt, $keyLength, $iterations, 'sha256');
echo bin2hex($generated_key)."\n";
echo base64_encode($generated_key)."\n";
?>
See Also
- hash_pbkdf2() - Generate a PBKDF2 key derivation of a supplied password
- openssl_get_md_methods() - Gets available digest methods
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