文字
openssl_cipher_iv_length
(PHP 5 >= PHP 5.3.3)
openssl_cipher_iv_length — Gets the cipher iv length
说明
int openssl_cipher_iv_length
( string
$method
)Gets the cipher initialization vector (iv) length.
参数
-
method -
The cipher method, see openssl_get_cipher_methods() for a list of potential values.
返回值
Returns the cipher length on success, or FALSE on failure.
错误／异常
Emits an E_WARNING level error when the cipher algorithm
is unknown.
范例
Example #1 openssl_cipher_iv_length() example
<?php
$method = 'AES-128-CBC' ;
$ivlen = openssl_cipher_iv_length ( $method );
echo $ivlen ;
?> 以上例程的输出类似于：
16
用户评论:
[#1] Tim Hunt [2014-12-10 17:37:37]
The return value is a length in bytes. (Not bits, or anything else.)