PHP Extension Requires Chilkat v11.6.0+

Hash a Password with Argon2 (Defaults)

Demonstrates Crypt2.Argon2HashPassword, which hashes a password with Argon2 and returns a PHC-format string. Passing an empty options string uses all defaults, including a random salt.

Background. Argon2 (RFC 9106) is a memory-hard function that is deliberately expensive in CPU time and memory, which is what makes brute-forcing the password space costly. The argon2id variant is recommended unless there is a specific reason to choose argon2i or argon2d. The returned PHC string records the variant, version, cost parameters, salt, and hash — everything needed to verify the password later. Store the whole string.

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<?php

include("chilkat.php");

$crypt = new CkCrypt2();

//  The password should come from a secure source rather than being hard-coded.
$password = 'correct horse battery staple';

//  Hash the password using all defaults by passing an empty options string.  The defaults are
//  Argon2id, version 19, 3 iterations, 64 MB of memory, 1 lane, a 32-byte hash, and a 16-byte random
//  salt.  A random salt is generated automatically, which is what should normally happen.
$phcHash = $crypt->argon2HashPassword($password,'');
if ($crypt->get_LastMethodSuccess() == false) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

//  The returned PHC-format string records the variant, version, cost parameters, salt, and hash --
//  everything needed to verify the password later.  Store the whole string.
print $phcHash . "\n";

?>