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185 lines
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HTML
185 lines
6.9 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>从随机源创建初始向量</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-create-iv" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mcrypt_create_iv</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_create_iv</span> — <span class="dc-title">从随机源创建初始向量</span></p>
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</div>
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<div id="function.mcrypt-create-iv-refsynopsisdiv">
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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This function was <em class="emphasis">DEPRECATED</em> in PHP 7.1.0, and
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<em class="emphasis">REMOVED</em> in PHP 7.2.0.
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</p>
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<p class="para">
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Alternatives to this function include:
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</p>
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="random_bytes.html" class="function">random_bytes()</a></span></li>
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</ul>
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</div>
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</div>
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<div class="refsect1 description" id="refsect1-function.mcrypt-create-iv-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_create_iv</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$size</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$source</code><span class="initializer"> = MCRYPT_DEV_URANDOM</span></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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从随机源创建初始向量。
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</p>
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<p class="para">
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初始向量只是为了给加密算法提供一个可用的种子，
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所以它不需要安全保护，
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你甚至可以随同密文一起发布初始向量也不会对安全性带来影响。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mcrypt-create-iv-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">size</code></dt>
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<dd>
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<p class="para">
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初始向量大小。
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</p>
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</dd>
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<dt>
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<code class="parameter">source</code></dt>
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<dd>
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<p class="para">
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初始向量数据来源。可选值有：
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<strong><code>MCRYPT_RAND</code></strong> （系统随机数生成器）,
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<strong><code>MCRYPT_DEV_RANDOM</code></strong> （从
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<var class="filename">/dev/random</var> 文件读取数据） 和
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<strong><code>MCRYPT_DEV_URANDOM</code></strong> （从
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<var class="filename">/dev/urandom</var> 文件读取数据）。
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在 Windows 平台，PHP 5.3.0 之前的版本中，仅支持 <strong><code>MCRYPT_RAND</code></strong>。
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</p>
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<p class="para">
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请注意，在 PHP 5.6.0 之前的版本中，
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此参数的默认值为 <strong><code>MCRYPT_DEV_RANDOM</code></strong>。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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需要注意的是，如果没有更多可用的用来产生随机数据的信息，那么
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<strong><code>MCRYPT_DEV_RANDOM</code></strong> 可能进入阻塞状态。
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</span>
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</p></blockquote>
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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-create-iv-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回初始向量。如果发生错误，则返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.mcrypt-create-iv-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>5.6.0</td>
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<td>
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<code class="parameter">source</code> 参数的默认值是
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<strong><code>MCRYPT_DEV_URANDOM</code></strong>。
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</td>
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</tr>
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<tr>
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<td>5.3.0</td>
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<td>
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<strong><code>MCRYPT_DEV_RANDOM</code></strong> 和
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<strong><code>MCRYPT_DEV_URANDOM</code></strong> 在 Windows 平台也可用了。
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</td>
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</tr>
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<tr>
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<td>5.3.0</td>
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<td>
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不再需要提前调用 <span class="function"><a href="srand.html" class="function">srand()</a></span> 函数，
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由本函数自动完成调用。
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</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.mcrypt-create-iv-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="foobar.examples.basic">
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<p><strong>Example #1 <span class="function"><strong>mcrypt_create_iv()</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 /> $size </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_get_iv_size</span><span style="color: #007700">(</span><span style="color: #0000BB">MCRYPT_CAST_256</span><span style="color: #007700">, </span><span style="color: #0000BB">MCRYPT_MODE_CFB</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$iv </span><span style="color: #007700">= </span><span style="color: #0000BB">mcrypt_create_iv</span><span style="color: #007700">(</span><span style="color: #0000BB">$size</span><span style="color: #007700">, </span><span style="color: #0000BB">MCRYPT_DEV_RANDOM</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 seealso" id="refsect1-function.mcrypt-create-iv-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"><a href="http://www.ciphersbyritter.com/GLOSSARY.HTM#IV" class="link external">» http://www.ciphersbyritter.com/GLOSSARY.HTM#IV</a></li>
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<li class="member"><a href="http://www.quadibloc.com/crypto/co0409.htm" class="link external">» http://www.quadibloc.com/crypto/co0409.htm</a></li>
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<li class="member">Applied Cryptography by Schneier (ISBN 0-471-11709-9) 9.3 节。</li>
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<li class="member"><span class="function"><a href="random_bytes.html" class="function" rel="rdfs-seeAlso">random_bytes()</a> - Generates cryptographically secure pseudo-random bytes</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> |