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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">dsa.h</div> </div>
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<a href="dsa_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// dsa.h - originally written and placed in the public domain by Wei Dai</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">/// \file dsa.h</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/// \brief Classes for the DSA signature algorithm</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#ifndef CRYPTOPP_DSA_H</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#define CRYPTOPP_DSA_H</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "<a class="code" href="gfpcrypt_8h.html">gfpcrypt.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/// \brief DSA Signature Format</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span><span class="comment">/// \details The DSA signature format used by Crypto++ is as defined by IEEE P1363.</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"></span><span class="comment">/// Java and .Net use the DER format, and OpenPGP uses the OpenPGP format.</span></div><div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94"> 17</a></span> <span class="comment"></span>enum <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a> {<span class="comment"></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> /// \brief Crypto++ native signature encoding format</span></div><div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ac021b0f700ffc5a1a60fbe1b3306b58a"> 19</a></span> <span class="comment"></span> <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ac021b0f700ffc5a1a60fbe1b3306b58a">DSA_P1363</a>,<span class="comment"></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> /// \brief signature encoding format used by Java and .Net</span></div><div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94aca50e4543c82e6ae2f04358592c569d7"> 21</a></span> <span class="comment"></span> <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94aca50e4543c82e6ae2f04358592c569d7">DSA_DER</a>,<span class="comment"></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> /// \brief OpenPGP signature encoding format</span></div><div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ab6a0ff8c8d8721382dbb821397609b18"> 23</a></span> <span class="comment"></span> <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ab6a0ff8c8d8721382dbb821397609b18">DSA_OPENPGP</a></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> };</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/// \brief Converts between signature encoding formats</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">/// \param buffer byte buffer for the converted signature encoding</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">/// \param bufferSize the length of the converted signature encoding buffer</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/// \param toFormat the source signature format</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/// \param signature byte buffer for the existing signature encoding</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">/// \param signatureLen the length of the existing signature encoding buffer</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">/// \param fromFormat the source signature format</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">/// \details This function converts between these formats, and returns length</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">/// of signature in the target format. If <tt>toFormat == DSA_P1363</tt>, then</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">/// <tt>bufferSize</tt> must equal <tt>publicKey.SignatureLength()</tt></span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">/// \since Crypto++ 1.0</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"></span><span class="keywordtype">size_t</span> <a class="code" href="dsa_8h.html#a23661b9fd140d90749d334eb4bf59d02">DSAConvertSignatureFormat</a>(<span class="keywordtype">byte</span> *buffer, <span class="keywordtype">size_t</span> bufferSize, <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a> toFormat,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keyword">const</span> <span class="keywordtype">byte</span> *signature, <span class="keywordtype">size_t</span> signatureLen, <a class="code" href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a> fromFormat);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> NAMESPACE_END</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="dsa_8h_html_a23661b9fd140d90749d334eb4bf59d02"><div class="ttname"><a href="dsa_8h.html#a23661b9fd140d90749d334eb4bf59d02">DSAConvertSignatureFormat</a></div><div class="ttdeci">size_t DSAConvertSignatureFormat(byte *buffer, size_t bufferSize, DSASignatureFormat toFormat, const byte *signature, size_t signatureLen, DSASignatureFormat fromFormat)</div><div class="ttdoc">Converts between signature encoding formats.</div><div class="ttdef"><b>Definition:</b> <a href="dsa_8cpp_source.html#l00015">dsa.cpp:15</a></div></div>
<div class="ttc" id="dsa_8h_html_aa37ccfd70d4cc99ec03ebb6f9075fc94"><div class="ttname"><a href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a></div><div class="ttdeci">DSASignatureFormat</div><div class="ttdoc">DSA Signature Format.</div><div class="ttdef"><b>Definition:</b> <a href="dsa_8h_source.html#l00017">dsa.h:17</a></div></div>
<div class="ttc" id="cryptlib_8h_html"><div class="ttname"><a href="cryptlib_8h.html">cryptlib.h</a></div><div class="ttdoc">Abstract base classes that provide a uniform interface to this library.</div></div>
<div class="ttc" id="dsa_8h_html_aa37ccfd70d4cc99ec03ebb6f9075fc94ac021b0f700ffc5a1a60fbe1b3306b58a"><div class="ttname"><a href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ac021b0f700ffc5a1a60fbe1b3306b58a">DSA_P1363</a></div><div class="ttdoc">Crypto++ native signature encoding format.</div><div class="ttdef"><b>Definition:</b> <a href="dsa_8h_source.html#l00019">dsa.h:19</a></div></div>
<div class="ttc" id="dsa_8h_html_aa37ccfd70d4cc99ec03ebb6f9075fc94aca50e4543c82e6ae2f04358592c569d7"><div class="ttname"><a href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94aca50e4543c82e6ae2f04358592c569d7">DSA_DER</a></div><div class="ttdoc">signature encoding format used by Java and .Net</div><div class="ttdef"><b>Definition:</b> <a href="dsa_8h_source.html#l00021">dsa.h:21</a></div></div>
<div class="ttc" id="gfpcrypt_8h_html"><div class="ttname"><a href="gfpcrypt_8h.html">gfpcrypt.h</a></div><div class="ttdoc">Classes and functions for schemes based on Discrete Logs (DL) over GF(p)</div></div>
<div class="ttc" id="namespace_crypto_p_p_html"><div class="ttname"><a href="namespace_crypto_p_p.html">CryptoPP</a></div><div class="ttdoc">Crypto++ library namespace.</div></div>
<div class="ttc" id="dsa_8h_html_aa37ccfd70d4cc99ec03ebb6f9075fc94ab6a0ff8c8d8721382dbb821397609b18"><div class="ttname"><a href="dsa_8h.html#aa37ccfd70d4cc99ec03ebb6f9075fc94ab6a0ff8c8d8721382dbb821397609b18">DSA_OPENPGP</a></div><div class="ttdoc">OpenPGP signature encoding format.</div><div class="ttdef"><b>Definition:</b> <a href="dsa_8h_source.html#l00023">dsa.h:23</a></div></div>
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