📄 function.mcrypt-enc-get-iv-size.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returns the size of the IV of the opened algorithm</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mcrypt-enc-get-block-size.html">mcrypt_enc_get_block_size</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mcrypt-enc-get-key-size.html">mcrypt_enc_get_key_size</a></div> <div class="up"><a href="ref.mcrypt.html">Mcrypt Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mcrypt-enc-get-iv-size" class="refentry"> <div class="refnamediv"> <h1 class="refname">mcrypt_enc_get_iv_size</h1> <p class="verinfo">(PHP 4 >= 4.0.2, PHP 5)</p><p class="refpurpose"><span class="refname">mcrypt_enc_get_iv_size</span> — <span class="dc-title">Returns the size of the IV of the opened algorithm</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>mcrypt_enc_get_iv_size</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$td</tt></span> )</div> <p class="para rdfs-comment"> This function returns the size of the IV of the algorithm specified by the encryption descriptor in bytes. An IV is used in cbc, cfb and ofb modes, and in some algorithms in stream mode. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">td</tt></i></span> <dd> <p class="para"> The encryption descriptor. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the size of the IV, or 0 if the IV is ignored in the algorithm. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mcrypt-enc-get-block-size.html">mcrypt_enc_get_block_size</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mcrypt-enc-get-key-size.html">mcrypt_enc_get_key_size</a></div> <div class="up"><a href="ref.mcrypt.html">Mcrypt Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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