OpenSSL 函数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 iv length.
参数
-
method -
The method.
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
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