openssl_cipher_iv_length
(PHP 5 >= 5.3.3, PHP 7)
openssl_cipher_iv_length — Gets the cipher iv length
Description
openssl_cipher_iv_length ( string $method ) : int
Gets the cipher initialization vector (iv) length.
Parameters
-
method -
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_iv_length() example
<?php $method = 'AES-128-CBC'; $ivlen = openssl_cipher_iv_length($method); echo $ivlen; ?>
The above example will output something similar to:
16
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https://www.php.net/manual/en/function.openssl-cipher-iv-length.php