mcrypt-enc-get-supported-key-sizes.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
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<refentry xml:id="function.mcrypt-enc-get-supported-key-sizes" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mcrypt_enc_get_supported_key_sizes</refname>
  <refpurpose>以数组方式返回打开的算法所支持的密钥长度</refpurpose>
 </refnamediv>
 
 <refsynopsisdiv>
  &warn.deprecated.function-7-1-0.removed-7-2-0;
 </refsynopsisdiv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>mcrypt_enc_get_supported_key_sizes</methodname>
   <methodparam><type>resource</type><parameter>td</parameter></methodparam>
  </methodsynopsis>
  <para>
   获取打开的算法所支持的密钥长度。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>td</parameter></term>
     <listitem>
      <para>
       加密描述符。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回由加密描述符指定的算法所能够支持的密钥长度。
   如果该算法支持从 1 到
   <function>mcrypt_enc_get_key_size</function>
   之间任意长度的密钥，则返回空数组。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mcrypt_enc_get_supported_key_sizes</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
    $td = mcrypt_module_open('rijndael-256', '', 'ecb', '');
    var_dump(mcrypt_enc_get_supported_key_sizes($td));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
array(3) {
  [0]=>
  int(16)
  [1]=>
  int(24)
  [2]=>
  int(32)
}
]]>
    </screen>
   </example>
  </para>
 </refsect1>
</refentry>

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