Mcrypt 函数
PHP Manual

mcrypt_get_iv_size

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_get_iv_sizeReturns the size of the IV belonging to a specific cipher/mode combination

说明

int mcrypt_get_iv_size ( string $cipher , string $mode )

Gets the size of the IV belonging to a specific cipher/mode combination.

It is more useful to use the mcrypt_enc_get_iv_size() function as this uses the resource returned by mcrypt_module_open().

参数

cipher

MCRYPT_ciphername 常量中的一个,或者是字符串值的算法名称。

mode

MCRYPT_MODE_modename 常量中的一个,或以下字符串中的一个:"ecb","cbc","cfb","ofb","nofb" 和 "stream"。

The IV is ignored in ECB mode as this mode does not require it. You will need to have the same IV (think: starting point) both at encryption and decryption stages, otherwise your encryption will fail.

返回值

Returns the size of the Initialization Vector (IV) in bytes. On error the function returns FALSE. If the IV is ignored in the specified cipher/mode combination zero is returned.

范例

Example #1 mcrypt_get_iv_size() Example

<?php
    
echo mcrypt_get_iv_size(MCRYPT_CAST_256MCRYPT_MODE_CFB) . "\n";

    echo 
mcrypt_get_iv_size('des''ecb') . "\n";
?>

参见


Mcrypt 函数
PHP Manual