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PHP openssl_pbkdf2

PHP original manual for openssl_pbkdf2 [ show | php.net ]

openssl_pbkdf2

(PHP 5 >= 5.5.0, PHP 7)

openssl_pbkdf2Generates a PKCS5 v2 PBKDF2 string

Description

string openssl_pbkdf2 ( string $password , string $salt , int $key_length , int $iterations [, string $digest_algorithm = "sha1" ] )

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_algorithm

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