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<title>class OpenSSL::HMACError - RDoc Documentation</title>
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<h3>Table of Contents</h3>
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<li><a href="#class-OpenSSL::HMACError-label-HMAC-SHA256+using+one-shot+interface">HMAC-SHA256 using one-shot interface</a>
<li><a href="#class-OpenSSL::HMACError-label-HMAC-SHA256+using+incremental+interface">HMAC-SHA256 using incremental interface</a>
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<h3>Parent</h3>
<p class="link"><a href="OpenSSLError.html">OpenSSL::OpenSSLError</a>
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<h1 id="class-OpenSSL::HMACError" class="class">
class OpenSSL::HMACError
</h1>
<section class="description">
<p>Document-class: <a href="HMAC.html"><code>OpenSSL::HMAC</code></a></p>
<p><a href="HMAC.html"><code>OpenSSL::HMAC</code></a> allows computing Hash-based Message Authentication Code (<a href="HMAC.html"><code>HMAC</code></a>). It is a type of message authentication code (MAC) involving a hash function in combination with a key. <a href="HMAC.html"><code>HMAC</code></a> can be used to verify the integrity of a message as well as the authenticity.</p>
<p><a href="HMAC.html"><code>OpenSSL::HMAC</code></a> has a similar interface to <a href="Digest.html"><code>OpenSSL::Digest</code></a>.</p>
<h3 id="class-OpenSSL::HMACError-label-HMAC-SHA256+using+one-shot+interface">HMAC-SHA256 using one-shot interface<span><a href="#class-OpenSSL::HMACError-label-HMAC-SHA256+using+one-shot+interface">¶</a> <a href="#top">↑</a></span></h3>
<pre class="ruby"><span class="ruby-identifier">key</span> = <span class="ruby-string">"key"</span>
<span class="ruby-identifier">data</span> = <span class="ruby-string">"message-to-be-authenticated"</span>
<span class="ruby-identifier">mac</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">HMAC</span>.<span class="ruby-identifier">hexdigest</span>(<span class="ruby-string">"SHA256"</span>, <span class="ruby-identifier">key</span>, <span class="ruby-identifier">data</span>)
<span class="ruby-comment">#=> "cddb0db23f469c8bf072b21fd837149bd6ace9ab771cceef14c9e517cc93282e"</span>
</pre>
<h3 id="class-OpenSSL::HMACError-label-HMAC-SHA256+using+incremental+interface">HMAC-SHA256 using incremental interface<span><a href="#class-OpenSSL::HMACError-label-HMAC-SHA256+using+incremental+interface">¶</a> <a href="#top">↑</a></span></h3>
<pre class="ruby"><span class="ruby-identifier">data1</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">"file1"</span>)
<span class="ruby-identifier">data2</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">read</span>(<span class="ruby-string">"file2"</span>)
<span class="ruby-identifier">key</span> = <span class="ruby-string">"key"</span>
<span class="ruby-identifier">digest</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">Digest</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">'SHA256'</span>)
<span class="ruby-identifier">hmac</span> = <span class="ruby-constant">OpenSSL</span><span class="ruby-operator">::</span><span class="ruby-constant">HMAC</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">digest</span>)
<span class="ruby-identifier">hmac</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">data1</span>
<span class="ruby-identifier">hmac</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">data2</span>
<span class="ruby-identifier">mac</span> = <span class="ruby-identifier">hmac</span>.<span class="ruby-identifier">digest</span>
</pre>
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