openssl_cipher_iv_length

(PHP 5 >= PHP 5.3.3)

openssl_cipher_iv_length — Gets the cipher iv length

int openssl_cipher_iv_length ( string $method )

Gets the cipher initialization vector (iv) length.

method: The cipher method, see openssl_get_cipher_methods() for a list of potential values.

Returns the cipher length on success, or FALSE on failure.

Emits an E_WARNING level error when the cipher algorithm is unknown.

Example #1 openssl_cipher_iv_length() example


<?php
$method = 'AES-128-CBC';
$ivlen = openssl_cipher_iv_length($method);

echo $ivlen;
?>

위 예제의 출력 예시: