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<div id="projectname">Crypto++
 <span id="projectnumber">7.0</span>
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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<div class="title">poly1305.h File Reference</div> </div>
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<p>Classes for <a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> message authentication code.
<a href="#details">More...</a></p>
<p><a href="poly1305_8h_source.html">Go to the source code of this file.</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_poly1305___base.html">Poly1305_Base< T ></a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> message authentication code base class. <a href="class_poly1305___base.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_poly1305.html">Poly1305< T ></a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> message authentication code. <a href="class_poly1305.html#details">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Classes for <a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> message authentication code. </p>
<p>Poly1305-AES is a state-of-the-art message-authentication code suitable for a wide variety of applications. Poly1305-AES computes a 16-byte authenticator of a variable-length message, using a 16-byte <a class="el" href="class_a_e_s.html" title="AES block cipher (Rijndael) ">AES</a> key, a 16-byte additional key, and a 16-byte nonce.</p>
<p>Each message must use a unique security context, which means either the key or nonce must be changed after each message. It can be accomplished in one of two ways. First, you can create a new <a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> object with a key and nonce each time its needed. </p><pre> <a class="el" href="class_sec_byte_block.html" title="SecBlock<byte> typedef. ">SecByteBlock</a> key(32), nonce(16);
prng.GenerateBlock(key, key.size());
prng.GenerateBlock(nonce, nonce.size());</pre><pre> Poly1305<AES> poly1305(key, key.size(), nonce, nonce.size());
poly1305.Update(...);
poly1305.Final(...);</pre><p>Second, you can create a <a class="el" href="class_poly1305.html" title="Poly1305 message authentication code. ">Poly1305</a> object, reuse the key, and set a fresh nonce for each message. The second and subsequent nonces can be generated directly using a <a class="el" href="class_random_number_generator.html" title="Interface for random number generators. ">RandomNumberGenerator()</a> derived class; or it can be generated using GetNextIV(). </p><pre> <a class="el" href="class_sec_byte_block.html" title="SecBlock<byte> typedef. ">SecByteBlock</a> key(32), nonce(16);
prng.GenerateBlock(key, key.size());
prng.GenerateBlock(nonce, nonce.size());</pre><pre> // First message
Poly1305<AES> poly1305(key, key.size());
poly1305.Resynchronize(nonce);
poly1305.Update(...);
poly1305.Final(...);</pre><pre> // Second message
poly1305.GetNextIV(prng, nonce);
poly1305.Resynchronize(nonce);
poly1305.Update(...);
poly1305.Final(...);
...</pre> <dl class="section see"><dt>See also</dt><dd>Daniel J. Bernstein <a href="http://cr.yp.to/mac/poly1305-20050329.pdf">The Poly1305-AES Message-Authentication Code (20050329)</a> and Andy Polyakov <a href="http://www.openssl.org/blog/blog/2016/02/15/poly1305-revised/">Poly1305 Revised</a> </dd></dl>
<dl class="section since"><dt>Since</dt><dd>Crypto++ 6.0 </dd></dl>
<p class="definition">Definition in file <a class="el" href="poly1305_8h_source.html">poly1305.h</a>.</p>
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