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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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<a href="emsa2_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">// emsa2.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 emsa2.h</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/// \brief Classes and functions for various padding schemes used in public key algorithms</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_EMSA2_H</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#define CRYPTOPP_EMSA2_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="pubkey_8h.html">pubkey.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "<a class="code" href="hashfwd_8h.html">hashfwd.h</a>"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></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="preprocessor">#ifdef CRYPTOPP_IS_DLL</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor"># include "<a class="code" href="sha_8h.html">sha.h</a>"</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">/// \brief EMSA2 hash identifier</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"></span><span class="comment">/// \tparam H HashTransformation derived class</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span><span class="comment">/// \since Crypto++ 5.0</span></div><div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="class_e_m_s_a2_hash_id.html"> 23</a></span> <span class="comment"></span>template <class H> class <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId</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="keyword">public</span>:</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">byte</span> id;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> };</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/// \brief EMSA2 padding method</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/// \tparam BASE Message encoding method</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">/// \since Crypto++ 5.0</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"></span><span class="keyword">template</span> <<span class="keyword">class</span> BASE></div><div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="class_e_m_s_a2_hash_id_lookup.html"> 33</a></span> <span class="keyword">class </span><a class="code" href="class_e_m_s_a2_hash_id_lookup.html">EMSA2HashIdLookup</a> : <span class="keyword">public</span> BASE</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> {</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup.html"> 36</a></span>  <span class="keyword">struct </span><a class="code" href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup.html">HashIdentifierLookup</a></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  {</div><div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup_1_1_hash_identifier_lookup2.html"> 38</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> H> <span class="keyword">struct </span><a class="code" href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup_1_1_hash_identifier_lookup2.html">HashIdentifierLookup2</a></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>  <span class="keyword">static</span> HashIdentifier Lookup()</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="keywordflow">return</span> HashIdentifier(&<a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<H>::id</a>, 1);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  };</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  };</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> };</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// EMSA2HashId can be instantiated with the following classes.</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// SHA1, SHA224, SHA256, SHA384, SHA512, RIPEMD128, RIPEMD160, Whirlpool</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#ifdef CRYPTOPP_IS_DLL</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA1></a>;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA224></a>;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA256></a>;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA384></a>;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> CRYPTOPP_DLL_TEMPLATE_CLASS <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA512></a>;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// https://github.com/weidai11/cryptopp/issues/300 and</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// https://github.com/weidai11/cryptopp/issues/533</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#if defined(__clang__)</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">byte</span> <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA1>::id</a>;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">byte</span> <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA224>::id</a>;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">byte</span> <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA256>::id</a>;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">byte</span> <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA384>::id</a>;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">template</span><> <span class="keyword">const</span> <span class="keywordtype">byte</span> <a class="code" href="class_e_m_s_a2_hash_id.html">EMSA2HashId<SHA512>::id</a>;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">/// \brief EMSA2 padding method</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">/// \since Crypto++ 5.0</span></div><div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="class_e_m_s_a2_pad.html"> 71</a></span> <span class="comment"></span><span class="keyword">class </span>CRYPTOPP_DLL <a class="code" href="class_e_m_s_a2_pad.html">EMSA2Pad</a> : <span class="keyword">public</span> <a class="code" href="class_e_m_s_a2_hash_id_lookup.html">EMSA2HashIdLookup</a><PK_DeterministicSignatureMessageEncodingMethod></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  CRYPTOPP_STATIC_CONSTEXPR <span class="keyword">const</span> <span class="keywordtype">char</span>* CRYPTOPP_API StaticAlgorithmName() {<span class="keywordflow">return</span> <span class="stringliteral">"EMSA2"</span>;}</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordtype">size_t</span> MinRepresentativeBitLength(<span class="keywordtype">size_t</span> hashIdentifierLength, <span class="keywordtype">size_t</span> digestLength)<span class="keyword"> const</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword"> </span>{CRYPTOPP_UNUSED(hashIdentifierLength); <span class="keywordflow">return</span> 8*digestLength + 31;}</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">void</span> ComputeMessageRepresentative(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng,</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">const</span> <span class="keywordtype">byte</span> *recoverableMessage, <span class="keywordtype">size_t</span> recoverableMessageLength,</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="class_hash_transformation.html">HashTransformation</a> &hash, HashIdentifier hashIdentifier, <span class="keywordtype">bool</span> messageEmpty,</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">byte</span> *representative, <span class="keywordtype">size_t</span> representativeBitLength) <span class="keyword">const</span>;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> };</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// EMSA2, for use with RWSS and RSA_ISO</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// Only the following hash functions are supported by this signature standard:</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">// \dontinclude emsa2.h</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// \skip EMSA2HashId can be instantiated</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// \until end of list</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"></span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/// \brief EMSA2/P1363 padding method</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">/// \details Use with RWSS and RSA_ISO</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">/// \since Crypto++ 5.0</span></div><div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="struct_p1363___e_m_s_a2.html"> 94</a></span> <span class="comment"></span><span class="keyword">struct </span><a class="code" href="struct_p1363___e_m_s_a2.html">P1363_EMSA2</a> : <span class="keyword">public</span> <a class="code" href="struct_signature_standard.html">SignatureStandard</a></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">typedef</span> <a class="code" href="class_e_m_s_a2_pad.html">EMSA2Pad</a> <a class="code" href="class_e_m_s_a2_pad.html">SignatureMessageEncodingMethod</a>;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> };</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> NAMESPACE_END</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="misc_8h_html"><div class="ttname"><a href="misc_8h.html">misc.h</a></div><div class="ttdoc">Utility functions for the Crypto++ library.</div></div>
<div class="ttc" id="hashfwd_8h_html"><div class="ttname"><a href="hashfwd_8h.html">hashfwd.h</a></div><div class="ttdoc">Forward declarations for hash functions used in signature encoding methods.</div></div>
<div class="ttc" id="pubkey_8h_html"><div class="ttname"><a href="pubkey_8h.html">pubkey.h</a></div><div class="ttdoc">This file contains helper classes/functions for implementing public key algorithms.</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="class_random_number_generator_html"><div class="ttname"><a href="class_random_number_generator.html">RandomNumberGenerator</a></div><div class="ttdoc">Interface for random number generators.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01330">cryptlib.h:1330</a></div></div>
<div class="ttc" id="class_e_m_s_a2_pad_html"><div class="ttname"><a href="class_e_m_s_a2_pad.html">EMSA2Pad</a></div><div class="ttdoc">EMSA2 padding method.</div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00071">emsa2.h:71</a></div></div>
<div class="ttc" id="struct_signature_standard_html"><div class="ttname"><a href="struct_signature_standard.html">SignatureStandard</a></div><div class="ttdoc">Base class for public key signature standard classes.</div><div class="ttdef"><b>Definition:</b> <a href="pubkey_8h_source.html#l02223">pubkey.h:2223</a></div></div>
<div class="ttc" id="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup_1_1_hash_identifier_lookup2_html"><div class="ttname"><a href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup_1_1_hash_identifier_lookup2.html">EMSA2HashIdLookup::HashIdentifierLookup::HashIdentifierLookup2</a></div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00038">emsa2.h:38</a></div></div>
<div class="ttc" id="class_e_m_s_a2_hash_id_html"><div class="ttname"><a href="class_e_m_s_a2_hash_id.html">EMSA2HashId</a></div><div class="ttdoc">EMSA2 hash identifier.</div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00023">emsa2.h:23</a></div></div>
<div class="ttc" id="struct_p1363___e_m_s_a2_html"><div class="ttname"><a href="struct_p1363___e_m_s_a2.html">P1363_EMSA2</a></div><div class="ttdoc">EMSA2/P1363 padding method.</div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00094">emsa2.h:94</a></div></div>
<div class="ttc" id="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup_html"><div class="ttname"><a href="struct_e_m_s_a2_hash_id_lookup_1_1_hash_identifier_lookup.html">EMSA2HashIdLookup::HashIdentifierLookup</a></div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00036">emsa2.h:36</a></div></div>
<div class="ttc" id="class_e_m_s_a2_hash_id_lookup_html"><div class="ttname"><a href="class_e_m_s_a2_hash_id_lookup.html">EMSA2HashIdLookup</a></div><div class="ttdoc">EMSA2 padding method.</div><div class="ttdef"><b>Definition:</b> <a href="emsa2_8h_source.html#l00033">emsa2.h:33</a></div></div>
<div class="ttc" id="sha_8h_html"><div class="ttname"><a href="sha_8h.html">sha.h</a></div><div class="ttdoc">Classes for SHA-1 and SHA-2 family of message digests.</div></div>
<div class="ttc" id="class_hash_transformation_html"><div class="ttname"><a href="class_hash_transformation.html">HashTransformation</a></div><div class="ttdoc">Interface for hash functions and data processing part of MACs.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01065">cryptlib.h:1065</a></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>
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