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126 lines
5.4 KiB
HTML
126 lines
5.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>获取指定加密算法的密钥大小</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.mcrypt-get-key-size" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mcrypt_get_key_size</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)</p><p class="refpurpose"><span class="refname">mcrypt_get_key_size</span> — <span class="dc-title">获取指定加密算法的密钥大小</span></p>
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</div>
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<div id="function.mcrypt-get-key-size-refsynopsisdiv">
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">This function has been
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<em class="emphasis">DEPRECATED</em> as of PHP 7.1.0. Relying on this function
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is highly discouraged.</p></div>
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</div>
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<div class="refsect1 description" id="refsect1-function.mcrypt-get-key-size-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>mcrypt_get_key_size</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$cipher</code></span>
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) : <span class="type">int</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>mcrypt_get_key_size</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$cipher</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$mode</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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第一个原型是针对 libmcrypt 2.2.x 的，
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第二个原型是针对 libmcrypt 2.4.x 或 2.5.x 的。
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</p>
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<p class="para">
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<span class="function"><strong>mcrypt_get_key_size()</strong></span> 用来获取
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由 <code class="parameter">cipher</code>
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所指定的算法和模式所需的密钥长度。
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</p>
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<p class="para">
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<span class="function"><a href="mcrypt_enc_get_key_size.html" class="function">mcrypt_enc_get_key_size()</a></span> 更加有用，
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因为它使用由 <span class="function"><a href="mcrypt_module_open.html" class="function">mcrypt_module_open()</a></span> 返回的资源。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mcrypt-get-key-size-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">cipher</code></dt>
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<dd>
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<p class="para"><strong><code>MCRYPT_ciphername</code></strong> 常量中的一个，或者是字符串值的算法名称。</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para"><strong><code>MCRYPT_MODE_modename</code></strong> 常量中的一个，或以下字符串中的一个："ecb"，"cbc"，"cfb"，"ofb"，"nofb" 和 "stream"。</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.mcrypt-get-key-size-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回算法所支持的最大密钥大小，以字节为单位。
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或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mcrypt-get-key-size-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-911">
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<p><strong>Example #1 <span class="function"><strong>mcrypt_get_key_size()</strong></span> 例程</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /> </span><span style="color: #007700">echo </span><span style="color: #0000BB">mcrypt_get_key_size</span><span style="color: #007700">(</span><span style="color: #DD0000">'tripledes'</span><span style="color: #007700">, </span><span style="color: #DD0000">'ecb'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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在 libmcrypt 2.4.x 或 2.5.x 版本中，
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如果使用本函数。
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</p></div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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24
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mcrypt-get-key-size-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="mcrypt_get_block_size.html" class="function" rel="rdfs-seeAlso">mcrypt_get_block_size()</a> - 获得加密算法的分组大小</span></li>
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<li class="member"><span class="function"><a href="mcrypt_enc_get_key_size.html" class="function" rel="rdfs-seeAlso">mcrypt_enc_get_key_size()</a> - 返回打开的模式所能支持的最长密钥</span></li>
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<li class="member"><span class="function"><a href="mcrypt_encrypt.html" class="function" rel="rdfs-seeAlso">mcrypt_encrypt()</a> - 使用给定参数加密明文</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |