openssl_cipher_key_length

(PHP 8 >= 8.2.0)

openssl_cipher_key_length — Gets the cipher key length

Description

openssl_cipher_key_length(string $cipher_algo): int|false

Gets the cipher key length.

Parameters

cipher_algo

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

Return Values

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

Errors/Exceptions

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

Examples

Example #1 openssl_cipher_key_length() example

<?php
$method = 'AES-128-CBC';

var_dump(openssl_cipher_key_length($method));
?>

The above example will output something similar to:

int(16)