PHP 5.4.36 Released

openssl_cipher_iv_length

(PHP 5 >= PHP 5.3.3)

openssl_cipher_iv_lengthGets the cipher iv length

Descrição

int openssl_cipher_iv_length ( string $method )

Gets the cipher initialization vector (iv) length.

Parâmetros

method

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

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 irá imprimir algo similar à:

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User Contributed Notes 1 note

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Tim Hunt
11 days ago
The return value is a length in bytes. (Not bits, or anything else.)
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