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>mcrypt_get_key_size</H1
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>    (PHP 3 &#62;= 3.0.8, PHP 4, PHP 5)</P
>mcrypt_get_key_size&nbsp;--&nbsp;Get the key size of the specified cipher</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN115897"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>mcrypt_get_key_size</B
> ( int cipher )<BR
></BR
>int <B
CLASS="methodname"
>mcrypt_get_key_size</B
> ( string cipher, string module )<BR
></BR
><P
>&#13;     The first prototype is when linked against libmcrypt 2.2.x, the
     second when linked against libmcrypt 2.4.x or 2.5.x.
    </P
><P
>&#13;     <B
CLASS="function"
>mcrypt_get_key_size()</B
> is used to get the size
     of a key of the specified <CODE
CLASS="parameter"
>cipher</CODE
> (in
     combination with an encryption mode).
    </P
><P
>&#13;     This example shows how to use this function when linked against libmcrypt
     2.4.x and 2.5.x. It is more useful to use the
     <A
HREF="function.mcrypt-enc-get-key-size.html"
><B
CLASS="function"
>mcrypt_enc_get_key_size()</B
></A
> function as this uses the
     resource returned by <A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
>.

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>例 1. <A
HREF="function.mcrypt-get-block-size.html"
><B
CLASS="function"
>mcrypt_get_block_size()</B
></A
> example</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#007700">echo </font><font color="#0000BB">mcrypt_get_key_size</font><font color="#007700">(</font><font color="#DD0000">'tripledes'</font><font color="#007700">, </font><font color="#DD0000">'ecb'</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;<br /></font><br />Prints:<br />24</font>
</code></TD
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></TD
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>
    </P
><P
>&#13;     See also: <A
HREF="function.mcrypt-get-block-size.html"
><B
CLASS="function"
>mcrypt_get_block_size()</B
></A
>,
     <B
CLASS="function"
>mcrypt_end_get_key_size()</B
> and
     <A
HREF="function.mcrypt-encrypt.html"
><B
CLASS="function"
>mcrypt_encrypt()</B
></A
>.
    </P
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