OPENSSL_CIPHER_IV_LENGTH(3) 1 OPENSSL_CIPHER_IV_LENGTH(3)
openssl_cipher_iv_length - Gets the cipher iv length
SYNOPSIS
int openssl_cipher_iv_length (string $method)
DESCRIPTION
Gets the cipher initialization vector (iv) length.
PARAMETERS
o $method
- The cipher method, see openssl_get_cipher_methods(3) 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(3) example
<?php
$method = 'AES-128-CBC';
$ivlen = openssl_cipher_iv_length($method);
echo $ivlen;
?>
The above example will output something similar to:
16
PHP Documentation Group OPENSSL_CIPHER_IV_LENGTH(3)
