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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Namespace: Decipher</title>
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<div id="main">
<h1 class="page-title">Namespace: Decipher</h1>
<section>
<header>
<h2>
<span class="ancestors"><a href="D.html">D</a><a href="D.crypto.html">.crypto</a>.</span>Decipher</h2>
</header>
<article>
<div class="container-overview">
<div class="description">Returned by D.crypto.createDecipher.<p>
Instances of the Decipher object are used to decrypt data.<br>
The object can be used in one of two ways:
<ul>
<li> As a stream that is both readable and writable, where plain encrypted data is written to produce unencrypted data on the readable side</li>
<li> Using the decipher.update() and decipher.final() methods to produce the unencrypted data.</li>
</ul></div>
<dl class="details">
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id=".final"><span class="type-signature">(static) </span>final<span class="signature">(outputEncoding<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {string|Buffer}</span></h4>
<div class="description">
Returns any remaining plaintext which is deciphered.<br>
If outputEncoding is specified, a string is returned. If an outputEncoding is not provided, a Buffer is returned.<p>
Once the decipher.final() method has been called, the Decipher object can no longer be used to decrypt data.<br>
Attempts to call decipher.final() more than once will result in an error being thrown.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>outputEncoding</code></td>
<td class="type">
<span class="param-type">binary</span>
|
<span class="param-type">base64</span>
|
<span class="param-type">hex</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last">The outputEncoding specifies the output format of the enciphered data, and can be 'binary', 'base64' or 'hex'.<br>If no encoding is provided, then a buffer is returned.</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
- Any remaining deciphered data
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">string</span>
|
<span class="param-type">Buffer</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="prettyprint"><code>D.crypto.createDecipher('sha1', 'key', 'initialization vector').final('binary')</code></pre>
<h4 class="name" id=".setAutoPadding"><span class="type-signature">(static) </span>setAutoPadding<span class="signature">(autoPadding<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<div class="description">
When data has been encrypted without standard block padding, calling decipher.setAutoPadding(false) will disable automatic padding to prevent decipher.final() from checking for and removing padding.<br>
Turning auto padding off will only work if the input data's length is a multiple of the cipher's block size.<p>
The decipher.setAutoPadding() method must be called before decipher.final().
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>autoPadding</code></td>
<td class="type">
<span class="param-type">bool</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
true
</td>
<td class="description last">The auto padding boolean flag.</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Example</h5>
<pre class="prettyprint"><code>D.crypto.createDecipher('sha1', 'key', 'initialization vector').setAutoPadding(false)</code></pre>
<h4 class="name" id=".update"><span class="type-signature">(static) </span>update<span class="signature">(data, inputEncoding<span class="signature-attributes">opt</span>, outputEncoding<span class="signature-attributes">opt</span>)</span><span class="type-signature"> → {string|Buffer}</span></h4>
<div class="description">
Updates the decipher with data.<br>
The decipher.update() method can be called multiple times with new data until decipher.final() is called.<br>
Calling decipher.update() after decipher.final() will result in an error being thrown.<p>
Input Encoding options:
<ul>
<li> If the inputEncoding argument is given, the data argument is a string using the specified encoding.</li>
<li> If the inputEncoding argument is not given, data must be a Buffer.</li>
<li> If data is a Buffer then inputEncoding is ignored.</li>
</ul>
Output Encoding options:
<ul>
<li> If the outputEncoding is specified, a string using the specified encoding is returned.</li>
<li> If no outputEncoding is provided, a Buffer is returned.</li>
</ul>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>data</code></td>
<td class="type">
<span class="param-type">string</span>
|
<span class="param-type">Buffer</span>
</td>
<td class="attributes">
</td>
<td class="description last">The data object.</td>
</tr>
<tr>
<td class="name"><code>inputEncoding</code></td>
<td class="type">
<span class="param-type">binary</span>
|
<span class="param-type">ascii</span>
|
<span class="param-type">utf8</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last">The encoding of the data string.<br>If data is a Buffer this argument is ignored.</td>
</tr>
<tr>
<td class="name"><code>outputEncoding</code></td>
<td class="type">
<span class="param-type">binary</span>
|
<span class="param-type">base64</span>
|
<span class="param-type">hex</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last">The encoding of the return value.<br>The output encoding specifies the output format of the enciphered data, and can be 'binary', 'base64' or 'hex'.<br>If no encoding is provided, then a buffer is returned.</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
- Returns the deciphered data
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">string</span>
|
<span class="param-type">Buffer</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="prettyprint"><code>D.crypto.createDecipher('sha1', 'key', 'initialization vector').update('data', 'binary', 'binary')</code></pre>
</article>
</section>
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