openssl_cipher_iv_length

(PHP 5 >= 5.3.3, PHP 7, PHP 8)

openssl_cipher_iv_lengthGets the cipher iv length

Descrição

openssl_cipher_iv_length(string $cipher_algo): int|false

Gets the cipher initialization vector (iv) length.

Parâmetros

cipher_algo

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

Valor Retornado

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

Erros/Exceções

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

Exemplos

Exemplo #1 openssl_cipher_iv_length() example

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

echo
$ivlen;
?>

O exemplo acima produzirá algo semelhante a:

16