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>mcrypt_get_iv_size</H1
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><P
>    (PHP 4 &#62;= 4.0.2)</P
>mcrypt_get_iv_size&nbsp;--&nbsp;Returns the size of the IV belonging to a specific cipher/mode combination</DIV
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NAME="AEN49292"
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><H2
>Description</H2
>int <B
CLASS="methodname"
>mcrypt_get_iv_size</B
> ( resource td)<BR
></BR
>int <B
CLASS="methodname"
>mcrypt_get_iv_size</B
> ( string cipher, string mode)<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 higher.
    </P
><P
>&#13;     <B
CLASS="function"
>mcrypt_get_iv_size()</B
> returns the size of
     the Initialisation Vector (IV) in bytes. On error the function
     returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
>. If the IV is ignored in the specified cipher/mode
     combination zero is returned.
    </P
><P
>&#13;     <TT
CLASS="parameter"
><I
>cipher</I
></TT
> is one of the MCRYPT_ciphername
     constants of the name of the algorithm as string.
    </P
><P
>&#13;     <TT
CLASS="parameter"
><I
>mode</I
></TT
> is one of the MCRYPT_MODE_modename
     constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or 
     "stream".
    </P
><P
>&#13;     <TT
CLASS="parameter"
><I
>td</I
></TT
> is the resource that is returned by
     <A
HREF="function.mcrypt-module-open.html"
><B
CLASS="function"
>mcrypt_module_open()</B
></A
>.
    </P
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><B
>Example 1. <A
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><B
CLASS="function"
>mcrypt_create_iv()</B
></A
> example</B
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><PRE
CLASS="php"
>&#60;?php
    $size = mcrypt_get_iv_size (MCRYPT_CAST_256, MCRYPT_MODE_CFB);

    $size = mcrypt_get_iv_size ('des', 'ecb');
?&#62;</PRE
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>
    </P
><P
>&#13;     See also: <A
HREF="function.mcrypt-create-iv.html"
><B
CLASS="function"
>mcrypt_create_iv()</B
></A
>
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