openssl_cipher_key_length
PHP function
Edit on GitHub ✎
(PHP 8 >= 8.2.0)
Gets the cipher key length
Description
openssl_cipher_key_length(string $cipher_algo): int|false
Gets the cipher key length.
Parameters
cipher_algoThe cipher method, see
openssl_get_cipher_methods()for a list of potential values.
Return Values
Returns the cipher length on success, Falseforfailure.
Errors/Exceptions
Emits an E_WARNING level error when the cipher algorithm is unknown.
Examples
openssl_cipher_key_length() example
php
<?php
$method = 'AES-128-CBC';
var_dump(openssl_cipher_key_length($method));
?>The above example will output something similar to:
output
int(16)