function.mhash-keygen-s2k.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>Generates a key</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.mhash-get-hash-name.html">mhash_get_hash_name</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mhash.html">mhash</a></div> <div class="up"><a href="ref.mhash.html">Mhash Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mhash-keygen-s2k" class="refentry"> <div class="refnamediv"> <h1 class="refname">mhash_keygen_s2k</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">mhash_keygen_s2k</span> — <span class="dc-title">Generates a key</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>mhash_keygen_s2k</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$hash</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$password</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$salt</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$bytes</tt></span> )</div> <p class="para rdfs-comment"> Generates a key according to the <i><tt class="parameter">hash</tt></i> given a user provided <i><tt class="parameter">password</tt></i>. </p> <p class="para"> This is the Salted S2K algorithm as specified in the OpenPGP document (<a href="http://www.faqs.org/rfcs/rfc2440" class="link external">» RFC 2440</a>). </p> <p class="para"> Keep in mind that user supplied passwords are not really suitable to be used as keys in cryptographic algorithms, since users normally choose keys they can write on keyboard. These passwords use only 6 to 7 bits per character (or less). It is highly recommended to use some kind of transformation (like this function) to the user supplied key. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">hash</tt></i></span> <dd> <p class="para"> The hash id used to create the key. One of the <i>MHASH_XXX</i> constants. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">password</tt></i></span> <dd> <p class="para"> User supplied password. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">salt</tt></i></span> <dd> <p class="para"> Must be different and random enough for every key you generate in order to create different keys. That salt must be known when you check the keys, thus it is a good idea to append the key to it. Salt has a fixed length of 8 bytes and will be padded with zeros if you supply less bytes. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">bytes</tt></i></span> <dd> <p class="para"> The key length, in bytes. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the generated key as a string, or <b><tt>FALSE</tt></b> on error. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mhash-get-hash-name.html">mhash_get_hash_name</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mhash.html">mhash</a></div> <div class="up"><a href="ref.mhash.html">Mhash 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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