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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>Decrypts crypttext with given parameters</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-create-iv.html">mcrypt_create_iv</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mcrypt-ecb.html">mcrypt_ecb</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-decrypt" class="refentry"> <div class="refnamediv"> <h1 class="refname">mcrypt_decrypt</h1> <p class="verinfo">(PHP 4 >= 4.0.2, PHP 5)</p><p class="refpurpose"><span class="refname">mcrypt_decrypt</span> — <span class="dc-title">Decrypts crypttext with given parameters</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>mcrypt_decrypt</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$cipher</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$key</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$data</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$mode</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$iv</tt></span> ] )</div> <p class="para rdfs-comment"> Decrypts the <i><tt class="parameter">data</tt></i> and returns the unencrypted data. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">cipher</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">cipher</tt></i> is one of the MCRYPT_ciphername constants of the name of the algorithm as string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">key</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">key</tt></i> is the key with which the data is encrypted. If it's smaller that the required keysize, it is padded with '<i>\0</i>'. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">data</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">data</tt></i> is the data that will be decrypted with the given cipher and mode. If the size of the data is not n * blocksize, the data will be padded with '<i>\0</i>'. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">mode</tt></i></span> <dd> <p class="para"> <i><tt class="parameter">mode</tt></i> is one of the MCRYPT_MODE_modename constants of one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">iv</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">iv</tt></i> parameter is used for the initialisation in CBC, CFB, OFB modes, and in some algorithms in STREAM mode. If you do not supply an IV, while it is needed for an algorithm, the function issues a warning and uses an IV with all bytes set to '<i>\0</i>'. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the decrypted data as a string. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mcrypt-create-iv.html">mcrypt_create_iv</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mcrypt-ecb.html">mcrypt_ecb</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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