function.openssl-seal.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>Seal (encrypt) data</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.openssl-public-encrypt.html">openssl_public_encrypt</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.openssl-sign.html">openssl_sign</a></div> <div class="up"><a href="ref.openssl.html">OpenSSL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.openssl-seal" class="refentry"> <div class="refnamediv"> <h1 class="refname">openssl_seal</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">openssl_seal</span> — <span class="dc-title">Seal (encrypt) data</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>openssl_seal</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$data</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$sealed_data</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter reference">&$env_keys</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter">$pub_key_ids</tt></span> )</div> <p class="para rdfs-comment"> <b>openssl_seal()</b> seals (encrypts) <i><tt class="parameter">data</tt></i> by using RC4 with a randomly generated secret key. The key is encrypted with each of the public keys associated with the identifiers in <i><tt class="parameter">pub_key_ids</tt></i> and each encrypted key is returned in <i><tt class="parameter">env_keys</tt></i>. This means that one can send sealed data to multiple recipients (provided one has obtained their public keys). Each recipient must receive both the sealed data and the envelope key that was encrypted with the recipient's public key. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">data</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">sealed_data</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">env_keys</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pub_key_ids</tt></i></span> <dd> <p class="para"> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the length of the sealed data on success, or <b><tt>FALSE</tt></b> on error. If successful the sealed data is returned in <i><tt class="parameter">sealed_data</tt></i>, and the envelope keys in <i><tt class="parameter">env_keys</tt></i>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>openssl_seal()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// $data is assumed to contain the data to be sealed<br /><br />// fetch public keys for our recipients, and ready them<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"/src/openssl-0.9.6/demos/maurice/cert.pem"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$cert </span><span style="color: #007700">= </span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">8192</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$pk1 </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_get_publickey</span><span style="color: #007700">(</span><span style="color: #0000BB">$cert</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// Repeat for second recipient<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"/src/openssl-0.9.6/demos/sign/cert.pem"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$cert </span><span style="color: #007700">= </span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">8192</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$pk2 </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_get_publickey</span><span style="color: #007700">(</span><span style="color: #0000BB">$cert</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// seal message, only owners of $pk1 and $pk2 can decrypt $sealed with keys<br />// $ekeys[0] and $ekeys[1] respectively.<br /></span><span style="color: #0000BB">openssl_seal</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$sealed</span><span style="color: #007700">, </span><span style="color: #0000BB">$ekeys</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$pk1</span><span style="color: #007700">, </span><span style="color: #0000BB">$pk2</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// free the keys from memory<br /></span><span style="color: #0000BB">openssl_free_key</span><span style="color: #007700">(</span><span style="color: #0000BB">$pk1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">openssl_free_key</span><span style="color: #007700">(</span><span style="color: #0000BB">$pk2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.openssl-open.html" class="function" rel="rdfs-seeAlso">openssl_open()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.openssl-public-encrypt.html">openssl_public_encrypt</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.openssl-sign.html">openssl_sign</a></div> <div class="up"><a href="ref.openssl.html">OpenSSL 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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