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<a href="#accessing-random-numbers" title="Accessing random numbers" class="md-nav__link">
Accessing random numbers
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<a href="#reading-integers" title="Reading integers" class="md-nav__link">
Reading integers
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Reading random data
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<a href="https://github.com/vapor/documentation/edit/master/3.0/docs/crypto/random.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
<h1 id="random">Random<a class="headerlink" href="#random" title="Permanent link">&para;</a></h1>
<p>Crypto has two primary random number generators.</p>
<p>OSRandom generates random numbers by calling the operating system's random number generator.</p>
<p>URandom generates random numbers by reading from <code>/dev/urandom</code>.</p>
<h2 id="accessing-random-numbers">Accessing random numbers<a class="headerlink" href="#accessing-random-numbers" title="Permanent link">&para;</a></h2>
<p>First, create an instance of the preferred random number generator:</p>
<div class="codehilite"><pre><span></span><span class="kd">let</span> <span class="nv">random</span> <span class="p">=</span> <span class="n">OSRandom</span><span class="p">()</span>
</pre></div>
<p>or</p>
<div class="codehilite"><pre><span></span><span class="kd">let</span> <span class="nv">random</span> <span class="p">=</span> <span class="k">try</span> <span class="n">URandom</span><span class="p">()</span>
</pre></div>
<h3 id="reading-integers">Reading integers<a class="headerlink" href="#reading-integers" title="Permanent link">&para;</a></h3>
<p>For every Swift integer a random number function exists.</p>
<div class="codehilite"><pre><span></span><span class="kd">let</span> <span class="nv">int8</span><span class="p">:</span> <span class="nb">Int8</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeInt8</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">uint8</span><span class="p">:</span> <span class="nb">UInt8</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeUInt8</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">int16</span><span class="p">:</span> <span class="nb">Int16</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeInt16</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">uint16</span><span class="p">:</span> <span class="nb">UInt16</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeUInt16</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">int32</span><span class="p">:</span> <span class="nb">Int32</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeInt32</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">uint32</span><span class="p">:</span> <span class="nb">UInt32</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeUInt32</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">int64</span><span class="p">:</span> <span class="nb">Int64</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeInt64</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">uint64</span><span class="p">:</span> <span class="nb">UInt64</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeUInt64</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">int</span><span class="p">:</span> <span class="nb">Int</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeInt</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">uint</span><span class="p">:</span> <span class="nb">UInt</span> <span class="p">=</span> <span class="k">try</span> <span class="n">random</span><span class="p">.</span><span class="n">makeUInt</span><span class="p">()</span>
</pre></div>
<h3 id="reading-random-data">Reading random data<a class="headerlink" href="#reading-random-data" title="Permanent link">&para;</a></h3>
<p>Random buffers of data are useful when, for example, generating tokens or other unique strings/blobs.</p>
<p>To generate a buffer of random data:</p>
<div class="codehilite"><pre><span></span><span class="c1">// generates 20 random bytes</span>
<span class="kd">let</span> <span class="nv">data</span><span class="p">:</span> <span class="n">Data</span> <span class="p">=</span> <span class="n">random</span><span class="p">.</span><span class="n">data</span><span class="p">(</span><span class="bp">count</span><span class="p">:</span> <span class="mi">20</span><span class="p">)</span>
</pre></div>
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