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101 lines
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HTML
101 lines
6.0 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>检测散列值是否匹配指定的选项</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.password-needs-rehash" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">password_needs_rehash</h1>
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<p class="verinfo">(PHP 5 >= 5.5.0, PHP 7)</p><p class="refpurpose"><span class="refname">password_needs_rehash</span> — <span class="dc-title">检测散列值是否匹配指定的选项</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.password-needs-rehash-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>password_needs_rehash</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$hash</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$algo</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$options</code></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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此函数检测指定的散列值是否实现了提供的算法和选项。
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如果没有，需要重新生成散列值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.password-needs-rehash-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">hash</code></dt>
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<dd>
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<p class="para">
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一个由 <span class="function"><a href="password_hash.html" class="function">password_hash()</a></span> 创建的散列值。
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</p>
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</dd>
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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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一个用来在散列密码时指示算法的<a href="password.constants.html" class="link">密码算法常量</a>。
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</p>
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</dd>
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<dt>
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<code class="parameter">options</code></dt>
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<dd>
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<p class="para">
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一个包含有选项的关联数组。目前支持两个选项：<em>salt</em>，在散列密码时加的盐（干扰字符串），以及<em>cost</em>，用来指明算法递归的层数。这两个值的例子可在 <span class="function"><a href="crypt.html" class="function">crypt()</a></span> 页面找到。
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 examples" id="refsect1-function.password-needs-rehash-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="openssl_spki_export_challenge.example.keygen">
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<p><strong>Example #1 <span class="function"><strong>password_needs_rehash()</strong></span>用法</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 /><br />$password </span><span style="color: #007700">= </span><span style="color: #DD0000">'rasmuslerdorf'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$hash </span><span style="color: #007700">= </span><span style="color: #DD0000">'$2y$10$YCFsG6elYca568hBi2pZ0.3LDL5wjgxct1N8w/oLR/jfHsiQwCqTS'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 当硬件性能得到改善时，cost 参数可以再修改<br /></span><span style="color: #0000BB">$options </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'cost' </span><span style="color: #007700">=> </span><span style="color: #0000BB">11</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 根据明文密码验证储存的散列<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">password_verify</span><span style="color: #007700">(</span><span style="color: #0000BB">$password</span><span style="color: #007700">, </span><span style="color: #0000BB">$hash</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// 检测是否有更新的可用散列算法<br /> // 或者 cost 发生变化<br /> </span><span style="color: #007700">if (</span><span style="color: #0000BB">password_needs_rehash</span><span style="color: #007700">(</span><span style="color: #0000BB">$hash</span><span style="color: #007700">, </span><span style="color: #0000BB">PASSWORD_DEFAULT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// 如果是这样，则创建新散列，替换旧散列<br /> </span><span style="color: #0000BB">$newHash </span><span style="color: #007700">= </span><span style="color: #0000BB">password_hash</span><span style="color: #007700">(</span><span style="color: #0000BB">$password</span><span style="color: #007700">, </span><span style="color: #0000BB">PASSWORD_DEFAULT</span><span style="color: #007700">, </span><span style="color: #0000BB">$options</span><span style="color: #007700">);<br /> }<br /><br /> </span><span style="color: #FF8000">// 使用户登录<br /></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>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.password-needs-rehash-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果散列需要重新生成才能匹配指定的 <code class="parameter">algo</code> 和 <code class="parameter">options</code>，
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则返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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</div></div></div></body></html> |