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173 lines
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HTML
173 lines
9.9 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>生成哈希值 （消息摘要）</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.hash" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">hash</h1>
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<p class="verinfo">(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)</p><p class="refpurpose"><span class="refname">hash</span> — <span class="dc-title">生成哈希值 （消息摘要）</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.hash-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>hash</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$algo</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$raw_output</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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] ) : <span class="type">string</span></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.hash-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">algo</code></dt>
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<dd>
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<p class="para">
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要使用的哈希算法，例如："md5"，"sha256"，"haval160,4" 等。
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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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要进行哈希运算的消息。
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</p>
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</dd>
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<dt>
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<code class="parameter">raw_output</code></dt>
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<dd>
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<p class="para">
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设置为 <strong><code>TRUE</code></strong> 输出原始二进制数据，
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设置为 <strong><code>FALSE</code></strong> 输出小写 16 进制字符串。
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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 returnvalues" id="refsect1-function.hash-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果 <code class="parameter">raw_output</code> 设置为 <strong><code>TRUE</code></strong>， 则返回原始二进制数据表示的信息摘要，
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否则返回 16 进制小写字符串格式表示的信息摘要。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.hash-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.4.0</td>
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<td>tiger 算法使用大端（big-endian）字节序。参见下面的示例。</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.hash-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="random-int.example.basic">
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<p><strong>Example #1 一个 <span class="function"><strong>hash()</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">hash</span><span style="color: #007700">(</span><span style="color: #DD0000">'ripemd160'</span><span style="color: #007700">, </span><span style="color: #DD0000">'The quick brown fox jumped over the lazy dog.'</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>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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ec457d0a974c48d5685a7efa03d137dc8bbde7e3
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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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<div class="example" id="example-901">
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<p><strong>Example #2 使用 PHP 5.4 或者更高版本计算 tiger 哈希值</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">function </span><span style="color: #0000BB">old_tiger</span><span style="color: #007700">(</span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #DD0000">""</span><span style="color: #007700">, </span><span style="color: #0000BB">$width</span><span style="color: #007700">=</span><span style="color: #0000BB">192</span><span style="color: #007700">, </span><span style="color: #0000BB">$rounds </span><span style="color: #007700">= </span><span style="color: #0000BB">3</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">substr</span><span style="color: #007700">(<br /> </span><span style="color: #0000BB">implode</span><span style="color: #007700">(<br /> </span><span style="color: #0000BB">array_map</span><span style="color: #007700">(<br /> function (</span><span style="color: #0000BB">$h</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">bin2hex</span><span style="color: #007700">(</span><span style="color: #0000BB">strrev</span><span style="color: #007700">(</span><span style="color: #0000BB">$h</span><span style="color: #007700">)), </span><span style="color: #0000BB">16</span><span style="color: #007700">, </span><span style="color: #DD0000">"0"</span><span style="color: #007700">);<br /> },<br /> </span><span style="color: #0000BB">str_split</span><span style="color: #007700">(</span><span style="color: #0000BB">hash</span><span style="color: #007700">(</span><span style="color: #DD0000">"tiger192,</span><span style="color: #0000BB">$rounds</span><span style="color: #DD0000">"</span><span style="color: #007700">, </span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">), </span><span style="color: #0000BB">8</span><span style="color: #007700">)<br /> )<br /> ),<br /> </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">48</span><span style="color: #007700">-(</span><span style="color: #0000BB">192</span><span style="color: #007700">-</span><span style="color: #0000BB">$width</span><span style="color: #007700">)/</span><span style="color: #0000BB">4<br /> </span><span style="color: #007700">);<br />}<br />echo </span><span style="color: #0000BB">hash</span><span style="color: #007700">(</span><span style="color: #DD0000">'tiger192,3'</span><span style="color: #007700">, </span><span style="color: #DD0000">'a-string'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">old_tiger</span><span style="color: #007700">(</span><span style="color: #DD0000">'a-string'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</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>以上例程在PHP 5.3中的输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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146a7492719b3564094efe7abbd40a7416fd900179d02773
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64359b7192746a14740ad4bb7afe4e097327d0790190fd16
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程在PHP 5.4中的输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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64359b7192746a14740ad4bb7afe4e097327d0790190fd16
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146a7492719b3564094efe7abbd40a7416fd900179d02773
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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.hash-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="hash_file.html" class="function" rel="rdfs-seeAlso">hash_file()</a> - 使用给定文件的内容生成哈希值</span></li>
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<li class="member"><span class="function"><a href="hash_hmac.html" class="function" rel="rdfs-seeAlso">hash_hmac()</a> - 使用 HMAC 方法生成带有密钥的哈希值</span></li>
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<li class="member"><span class="function"><a href="hash_init.html" class="function" rel="rdfs-seeAlso">hash_init()</a> - 初始化增量哈希运算上下文</span></li>
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<li class="member"><span class="function"><a href="md5.html" class="function" rel="rdfs-seeAlso">md5()</a> - 计算字符串的 MD5 散列值</span></li>
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<li class="member"><span class="function"><a href="sha1.html" class="function" rel="rdfs-seeAlso">sha1()</a> - 计算字符串的 sha1 散列值</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> |