PHP 5.4.36 Released

mcrypt_get_iv_size

(PHP 4 >= 4.0.2, PHP 5)

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

Descrierea

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().

Parametri

cipher

Una din constantele MCRYPT_ciphername sau denumirea algoritmului ca șir de caractere.

mode

Una din constantele MCRYPT_MODE_modename sau unul din șirurile de caractere: "ecb", "cbc", "cfb", "ofb", "nofb" sau "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.

Valorile întoarse

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.

Exemple

Example #1 mcrypt_get_iv_size() Example

<?php
    
echo mcrypt_get_iv_size(MCRYPT_CAST_256MCRYPT_MODE_CFB) . "\n";

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

Vedeți de asemenea

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top