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113 lines
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113 lines
11 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>解密数据</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.mdecrypt-generic" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mdecrypt_generic</h1>
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<p class="verinfo">(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)</p><p class="refpurpose"><span class="refname">mdecrypt_generic</span> — <span class="dc-title">解密数据</span></p>
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</div>
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<div id="function.mdecrypt-generic-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.mdecrypt-generic-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>mdecrypt_generic</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$td</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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解密数据。
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请注意，由于存在数据补齐的情况，
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返回字符串的长度可能和明文的长度不相等。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mdecrypt-generic-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">td</code></dt>
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<dd>
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<p class="para">
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由
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<span class="function"><a href="mcrypt_module_open.html" class="function">mcrypt_module_open()</a></span> 函数创建的加密描述符。
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</p>
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</dd>
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<dt>
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<code class="parameter">data</code></dt>
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<dd>
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<p class="para">
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密文。
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</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 examples" id="refsect1-function.mdecrypt-generic-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-917">
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<p><strong>Example #1 <span class="function"><strong>mdecrypt_generic()</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: #FF8000">/* 数据 */<br /> </span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #DD0000">'this is a very long key, even too long for the cipher'</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$plain_text </span><span style="color: #007700">= </span><span style="color: #DD0000">'very important data'</span><span style="color: #007700">;<br /><br /> </span><span style="color: #FF8000">/* 打开加密模块，并且创建初始向量 */<br /> </span><span style="color: #0000BB">$td </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_module_open</span><span style="color: #007700">(</span><span style="color: #DD0000">'des'</span><span style="color: #007700">, </span><span style="color: #DD0000">''</span><span style="color: #007700">, </span><span style="color: #DD0000">'ecb'</span><span style="color: #007700">, </span><span style="color: #DD0000">''</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">$key</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">mcrypt_enc_get_key_size</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">));<br /> </span><span style="color: #0000BB">$iv_size </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_enc_get_iv_size</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$iv </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_create_iv</span><span style="color: #007700">(</span><span style="color: #0000BB">$iv_size</span><span style="color: #007700">, </span><span style="color: #0000BB">MCRYPT_RAND</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* 初始化加密句柄 */<br /> </span><span style="color: #007700">if (</span><span style="color: #0000BB">mcrypt_generic_init</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">, </span><span style="color: #0000BB">$key</span><span style="color: #007700">, </span><span style="color: #0000BB">$iv</span><span style="color: #007700">) != -</span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br /><br /> </span><span style="color: #FF8000">/* 加密数据 */<br /> </span><span style="color: #0000BB">$c_t </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_generic</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">, </span><span style="color: #0000BB">$plain_text</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">mcrypt_generic_deinit</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* 为解密重新初始化缓冲区 */<br /> </span><span style="color: #0000BB">mcrypt_generic_init</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">, </span><span style="color: #0000BB">$key</span><span style="color: #007700">, </span><span style="color: #0000BB">$iv</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$p_t </span><span style="color: #007700">= </span><span style="color: #0000BB">mdecrypt_generic</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">, </span><span style="color: #0000BB">$c_t</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">/* 执行清理工作 */<br /> </span><span style="color: #0000BB">mcrypt_generic_deinit</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">mcrypt_module_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$td</span><span style="color: #007700">);<br /> }<br /><br /> if (</span><span style="color: #0000BB">strncmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$p_t</span><span style="color: #007700">, </span><span style="color: #0000BB">$plain_text</span><span style="color: #007700">, </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$plain_text</span><span style="color: #007700">)) == </span><span style="color: #0000BB">0</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"ok\n"</span><span style="color: #007700">;<br /> } else {<br /> echo </span><span style="color: #DD0000">"error\n"</span><span style="color: #007700">;<br /> }<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>
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</p>
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<p class="para">
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上例中演示了如何检测
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解密后的数据是否和原始明文长度一致。
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需要着重提醒的是，在对数据进行机密之前，
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必须使用 <span class="function"><a href="mcrypt_generic_init.html" class="function">mcrypt_generic_init()</a></span>
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函数来重新初始化缓冲区。
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</p>
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<p class="para">
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调用本函数之前，
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必须使用密钥和初始向量来调用 <span class="function"><a href="mcrypt_generic_init.html" class="function">mcrypt_generic_init()</a></span> 函数
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对解密句柄进行初始化。
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加解密工作完成之后，需要调用 <span class="function"><a href="mcrypt_generic_deinit.html" class="function">mcrypt_generic_deinit()</a></span> 来释放加解密缓冲区。
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例程请参见 <span class="function"><a href="mcrypt_module_open.html" class="function">mcrypt_module_open()</a></span>。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mdecrypt-generic-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_generic.html" class="function" rel="rdfs-seeAlso">mcrypt_generic()</a> - 加密数据</span></li>
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<li class="member"><span class="function"><a href="mcrypt_generic_init.html" class="function" rel="rdfs-seeAlso">mcrypt_generic_init()</a> - 初始化加密所需的缓冲区</span></li>
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<li class="member"><span class="function"><a href="mcrypt_generic_deinit.html" class="function" rel="rdfs-seeAlso">mcrypt_generic_deinit()</a> - 对加密模块进行清理工作</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> |