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<title>Encrypts/decrypts data in OFB mode</title>
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<h1 class="refname">mcrypt_ofb</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mcrypt_ofb</span> — <span class="dc-title">Encrypts/decrypts data in OFB mode</span></p>
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<div id="function.mcrypt-ofb-refsynopsisdiv">
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">
This function was <em class="emphasis">DEPRECATED</em> in PHP 5.5.0, and
<em class="emphasis">REMOVED</em> in PHP 7.0.0.
</p>
<p class="para">
Alternatives to this function include:
</p>
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.mcrypt-decrypt.html" class="function">mcrypt_decrypt()</a></span></li>
<li class="member"><span class="function"><a href="function.mcrypt-encrypt.html" class="function">mcrypt_encrypt()</a></span></li>
</ul>
</div>
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<div class="refsect1 description" id="refsect1-function.mcrypt-ofb-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>mcrypt_ofb</strong></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$cipher</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$iv</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>mcrypt_ofb</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$cipher</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$iv</code></span>
] )</div>
<p class="para rdfs-comment">
The first prototype is when linked against libmcrypt 2.2.x, the
second when linked against libmcrypt 2.4.x or higher. The
<code class="parameter">mode</code> should be either
<strong><code>MCRYPT_ENCRYPT</code></strong> or
<strong><code>MCRYPT_DECRYPT</code></strong>.
</p>
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