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109 lines
4.2 KiB
HTML
109 lines
4.2 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>初始化加密所需的缓冲区</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-generic-init" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mcrypt_generic_init</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">mcrypt_generic_init</span> — <span class="dc-title">初始化加密所需的缓冲区</span></p>
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</div>
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<div id="function.mcrypt-generic-init-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-generic-init-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_generic_init</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$td</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$iv</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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在每次调用
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<span class="function"><a href="mcrypt_generic.html" class="function">mcrypt_generic()</a></span> 或
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<span class="function"><a href="mdecrypt_generic.html" class="function">mdecrypt_generic()</a></span> 函数之前必须调用本函数。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mcrypt-generic-init-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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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">key</code></dt>
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<dd>
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<p class="para">
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调用 <span class="function"><a href="mcrypt_enc_get_key_size.html" class="function">mcrypt_enc_get_key_size()</a></span>
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函数获得的密钥最大长度。
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小于最大长度的数值都被视为非法参数。
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</p>
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</dd>
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<dt>
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<code class="parameter">iv</code></dt>
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<dd>
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<p class="para">
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通常情况下,向量大小等于算法的分组大小,
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但是你应该通过 <span class="function"><a href="mcrypt_enc_get_iv_size.html" class="function">mcrypt_enc_get_iv_size()</a></span> 函数
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来获得这个值。在 ECB 模式下,初始向量会被忽略,
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在 CFB,CBC,STREAM,nOFB 和 OFB 模式下,必须提供初始向量。
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初始向量要求是随机的,并且是唯一的(不需要是安全的)。
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加密和解密必须使用相同的初始向量。
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如果你不想使用初始向量,请将其设置为全 0 值,但是不建议你这么做。
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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.mcrypt-generic-init-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果发生错误,将会返回负数:
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-3 表示密钥长度有误,-4 表示内存分配失败,
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其他值表示未知错误,
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同时会显示对应的警告信息。
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如果传入参数不正确,返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mcrypt-generic-init-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_module_open.html" class="function" rel="rdfs-seeAlso">mcrypt_module_open()</a> - 打开算法和模式对应的模块</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> |