PHP Doku:: Returns the size of the IV belonging to a specific cipher/mode combination - function.mcrypt-get-iv-size.html
Verlauf / Chronik / History: (1) anzeigen
Sie sind hier:
Doku-Startseite ≥ PHP-Handbuch ≥ Funktionsreferenz ≥ Kryptografische Erweiterungen ≥ Mcrypt ≥ Mcrypt Funktionen ≥ mcrypt_get_iv_size

Ein Service von Reinhard Neidl - Webprogrammierung.

Mcrypt Funktionen

<<mcrypt_get_cipher_name

mcrypt_get_key_size>>

mcrypt_get_iv_size

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_get_iv_size — Returns the size of the IV belonging to a specific cipher/mode combination

Beschreibung

int mcrypt_get_iv_size ( string $cipher , string $mode )

Gets the size of the IV belonging to a specific cipher/mode combination.

It is more useful to use the mcrypt_enc_get_iv_size() function as this uses the resource returned by mcrypt_module_open().

Parameter-Liste

cipher

One of the MCRYPT_ciphername constants, or the name of the algorithm as string.

mode

One of the MCRYPT_MODE_modename constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". The IV is ignored in ECB mode as this mode does not require it. You will need to have the same IV (think: starting point) both at encryption and decryption stages, otherwise your encryption will fail.

Rückgabewerte

Returns the size of the Initialization Vector (IV) in bytes. On error the function returns FALSE. If the IV is ignored in the specified cipher/mode combination zero is returned.

Beispiele

Beispiel #1 mcrypt_get_iv_size() Example

<?php
    echo mcrypt_get_iv_size(MCRYPT_CAST_256, MCRYPT_MODE_CFB) . "\n";

    echo mcrypt_get_iv_size('des', 'ecb') . "\n";
?>

Siehe auch


Keine BenutzerBeiträge.
- Beiträge aktualisieren...


PHP Powered Diese Seite bei php.net
The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)