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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">oaep.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// oaep.cpp - 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> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "<a class="code" href="oaep_8h.html">oaep.h</a>"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "<a class="code" href="stdcpp_8h.html">stdcpp.h</a>"</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="smartptr_8h.html">smartptr.h</a>"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// ********************************************************</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="class_o_a_e_p___base.html#a4c58ceb4c2de7b39ed2151fbe9942e73"> 15</a></span> size_t <a class="code" href="class_o_a_e_p___base.html">OAEP_Base</a>::MaxUnpaddedLength(<span class="keywordtype">size_t</span> paddedLength)<span class="keyword"> const</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword"></span>{</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordflow">return</span> <a class="code" href="misc_8h.html#a30712a90999ad9d9152975f2e92d46b8">SaturatingSubtract</a>(paddedLength/8, 1+2*<a class="code" href="namespace_name.html#ae065e5d1d16c399ad5404659e649bfec">DigestSize</a>());</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> }</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="keywordtype">void</span> OAEP_Base::Pad(<a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a> &rng, <span class="keyword">const</span> <span class="keywordtype">byte</span> *input, <span class="keywordtype">size_t</span> inputLength, <span class="keywordtype">byte</span> *oaepBlock, <span class="keywordtype">size_t</span> oaepBlockLen, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)<span class="keyword"> const</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword"></span>{</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <a class="code" href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a> (inputLength <= <a class="code" href="class_o_a_e_p___base.html#a4c58ceb4c2de7b39ed2151fbe9942e73">MaxUnpaddedLength</a>(oaepBlockLen));</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="comment">// convert from bit length to byte length</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">if</span> (oaepBlockLen % 8 != 0)</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  {</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  oaepBlock[0] = 0;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  oaepBlock++;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  }</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  oaepBlockLen /= 8;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <a class="code" href="classmember__ptr.html">member_ptr<HashTransformation></a> pHash(NewHash());</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> hLen = pHash->DigestSize();</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> seedLen = hLen, dbLen = oaepBlockLen-seedLen;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">byte</span> *<span class="keyword">const</span> maskedSeed = oaepBlock;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">byte</span> *<span class="keyword">const</span> maskedDB = oaepBlock+seedLen;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="class_const_byte_array_parameter.html">ConstByteArrayParameter</a> encodingParameters;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  parameters.<a class="code" href="class_name_value_pairs.html#a5357c3a09602e44671d1e42cb9a9408d">GetValue</a>(<a class="code" href="namespace_name.html#abfc2af8f8cc15abc866b9a48478c763f">Name::EncodingParameters</a>(), encodingParameters);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// DB = pHash || 00 ... || 01 || M</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  pHash->CalculateDigest(maskedDB, encodingParameters.<a class="code" href="class_const_byte_array_parameter.html#ab89acc8dae383f2663dd3864651e8ef1">begin</a>(), encodingParameters.<a class="code" href="class_const_byte_array_parameter.html#ab83dbf7e4d80c0304917a3cc1d3cf144">size</a>());</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  memset(maskedDB+hLen, 0, dbLen-hLen-inputLength-1);</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  maskedDB[dbLen-inputLength-1] = 0x01;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  memcpy(maskedDB+dbLen-inputLength, input, inputLength);</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>  rng.<a class="code" href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17">GenerateBlock</a>(maskedSeed, seedLen);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <a class="code" href="classmember__ptr.html">member_ptr<MaskGeneratingFunction></a> pMGF(NewMGF());</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  pMGF->GenerateAndMask(*pHash, maskedDB, dbLen, maskedSeed, seedLen);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  pMGF->GenerateAndMask(*pHash, maskedSeed, seedLen, maskedDB, dbLen);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a> OAEP_Base::Unpad(<span class="keyword">const</span> <span class="keywordtype">byte</span> *oaepBlock, <span class="keywordtype">size_t</span> oaepBlockLen, <span class="keywordtype">byte</span> *output, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters)<span class="keyword"> const</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword"></span>{</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">bool</span> invalid = <span class="keyword">false</span>;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// convert from bit length to byte length</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (oaepBlockLen % 8 != 0)</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  invalid = (oaepBlock[0] != 0) || invalid;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  oaepBlock++;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  oaepBlockLen /= 8;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="classmember__ptr.html">member_ptr<HashTransformation></a> pHash(NewHash());</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> hLen = pHash->DigestSize();</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> seedLen = hLen, dbLen = oaepBlockLen-seedLen;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  invalid = (oaepBlockLen < 2*hLen+1) || invalid;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="class_sec_byte_block.html">SecByteBlock</a> t(oaepBlock, oaepBlockLen);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">byte</span> *<span class="keyword">const</span> maskedSeed = t;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">byte</span> *<span class="keyword">const</span> maskedDB = t+seedLen;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="classmember__ptr.html">member_ptr<MaskGeneratingFunction></a> pMGF(NewMGF());</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  pMGF->GenerateAndMask(*pHash, maskedSeed, seedLen, maskedDB, dbLen);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  pMGF->GenerateAndMask(*pHash, maskedDB, dbLen, maskedSeed, seedLen);</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>  <a class="code" href="class_const_byte_array_parameter.html">ConstByteArrayParameter</a> encodingParameters;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  parameters.<a class="code" href="class_name_value_pairs.html#a5357c3a09602e44671d1e42cb9a9408d">GetValue</a>(<a class="code" href="namespace_name.html#abfc2af8f8cc15abc866b9a48478c763f">Name::EncodingParameters</a>(), encodingParameters);</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// DB = pHash' || 00 ... || 01 || M</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">byte</span> *M = std::find(maskedDB+hLen, maskedDB+dbLen, 0x01);</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  invalid = (M == maskedDB+dbLen) || invalid;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  invalid = (<a class="code" href="misc_8h.html#ab29e4cf4553b1ff9f884df223a2abd6a">FindIfNot</a>(maskedDB+hLen, M, <span class="keywordtype">byte</span>(0)) != M) || invalid;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  invalid = !pHash->VerifyDigest(maskedDB, encodingParameters.<a class="code" href="class_const_byte_array_parameter.html#ab89acc8dae383f2663dd3864651e8ef1">begin</a>(), encodingParameters.<a class="code" href="class_const_byte_array_parameter.html#ab83dbf7e4d80c0304917a3cc1d3cf144">size</a>()) || invalid;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (invalid)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>();</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  M++;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  memcpy(output, M, maskedDB+dbLen-M);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> <a class="code" href="struct_decoding_result.html">DecodingResult</a>(maskedDB+dbLen-M);</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</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> NAMESPACE_END</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> <span class="preprocessor">#endif</span></div><div class="ttc" id="class_const_byte_array_parameter_html"><div class="ttname"><a href="class_const_byte_array_parameter.html">ConstByteArrayParameter</a></div><div class="ttdoc">Used to pass byte array input as part of a NameValuePairs object.</div><div class="ttdef"><b>Definition:</b> <a href="algparam_8h_source.html#l00020">algparam.h:20</a></div></div>
<div class="ttc" id="misc_8h_html_ab29e4cf4553b1ff9f884df223a2abd6a"><div class="ttname"><a href="misc_8h.html#ab29e4cf4553b1ff9f884df223a2abd6a">FindIfNot</a></div><div class="ttdeci">InputIt FindIfNot(InputIt first, InputIt last, const T &value)</div><div class="ttdoc">Finds first element not in a range.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l02540">misc.h:2540</a></div></div>
<div class="ttc" id="namespace_name_html_ae065e5d1d16c399ad5404659e649bfec"><div class="ttname"><a href="namespace_name.html#ae065e5d1d16c399ad5404659e649bfec">Name::DigestSize</a></div><div class="ttdeci">const char * DigestSize()</div><div class="ttdoc">int, in bytes</div><div class="ttdef"><b>Definition:</b> <a href="argnames_8h_source.html#l00079">argnames.h:79</a></div></div>
<div class="ttc" id="class_o_a_e_p___base_html"><div class="ttname"><a href="class_o_a_e_p___base.html">OAEP_Base</a></div><div class="ttdoc">OAEP padding base class.</div><div class="ttdef"><b>Definition:</b> <a href="oaep_8h_source.html#l00018">oaep.h:18</a></div></div>
<div class="ttc" id="class_random_number_generator_html_a497145546d24e6d4abaf10b7e0f1ba17"><div class="ttname"><a href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17">RandomNumberGenerator::GenerateBlock</a></div><div class="ttdeci">virtual void GenerateBlock(byte *output, size_t size)</div><div class="ttdoc">Generate random array of bytes.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00317">cryptlib.cpp:317</a></div></div>
<div class="ttc" id="class_const_byte_array_parameter_html_ab83dbf7e4d80c0304917a3cc1d3cf144"><div class="ttname"><a href="class_const_byte_array_parameter.html#ab83dbf7e4d80c0304917a3cc1d3cf144">ConstByteArrayParameter::size</a></div><div class="ttdeci">size_t size() const</div><div class="ttdoc">Length of the memory block.</div><div class="ttdef"><b>Definition:</b> <a href="algparam_8h_source.html#l00084">algparam.h:84</a></div></div>
<div class="ttc" id="smartptr_8h_html"><div class="ttname"><a href="smartptr_8h.html">smartptr.h</a></div><div class="ttdoc">Classes for automatic resource management.</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="stdcpp_8h_html"><div class="ttname"><a href="stdcpp_8h.html">stdcpp.h</a></div><div class="ttdoc">Common C++ header files.</div></div>
<div class="ttc" id="class_sec_byte_block_html"><div class="ttname"><a href="class_sec_byte_block.html">SecByteBlock</a></div><div class="ttdoc">SecBlock<byte> typedef.</div><div class="ttdef"><b>Definition:</b> <a href="secblock_8h_source.html#l00822">secblock.h:822</a></div></div>
<div class="ttc" id="classmember__ptr_html"><div class="ttname"><a href="classmember__ptr.html">member_ptr</a></div><div class="ttdoc">Pointer that overloads operator -></div><div class="ttdef"><b>Definition:</b> <a href="smartptr_8h_source.html#l00036">smartptr.h:36</a></div></div>
<div class="ttc" id="struct_decoding_result_html"><div class="ttname"><a href="struct_decoding_result.html">DecodingResult</a></div><div class="ttdoc">Returns a decoding results.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00252">cryptlib.h:252</a></div></div>
<div class="ttc" id="class_const_byte_array_parameter_html_ab89acc8dae383f2663dd3864651e8ef1"><div class="ttname"><a href="class_const_byte_array_parameter.html#ab89acc8dae383f2663dd3864651e8ef1">ConstByteArrayParameter::begin</a></div><div class="ttdeci">const byte * begin() const</div><div class="ttdoc">Pointer to the first byte in the memory block.</div><div class="ttdef"><b>Definition:</b> <a href="algparam_8h_source.html#l00080">algparam.h:80</a></div></div>
<div class="ttc" id="namespace_name_html_abfc2af8f8cc15abc866b9a48478c763f"><div class="ttname"><a href="namespace_name.html#abfc2af8f8cc15abc866b9a48478c763f">Name::EncodingParameters</a></div><div class="ttdeci">const char * EncodingParameters()</div><div class="ttdoc">ConstByteArrayParameter.</div><div class="ttdef"><b>Definition:</b> <a href="argnames_8h_source.html#l00066">argnames.h:66</a></div></div>
<div class="ttc" id="pch_8h_html"><div class="ttname"><a href="pch_8h.html">pch.h</a></div><div class="ttdoc">Precompiled header file.</div></div>
<div class="ttc" id="misc_8h_html_a30712a90999ad9d9152975f2e92d46b8"><div class="ttname"><a href="misc_8h.html#a30712a90999ad9d9152975f2e92d46b8">SaturatingSubtract</a></div><div class="ttdeci">T1 SaturatingSubtract(const T1 &a, const T2 &b)</div><div class="ttdoc">Performs a saturating subtract clamped at 0.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00890">misc.h:890</a></div></div>
<div class="ttc" id="trap_8h_html_adf3b392588bc94cbeae9f415a78c7b95"><div class="ttname"><a href="trap_8h.html#adf3b392588bc94cbeae9f415a78c7b95">CRYPTOPP_ASSERT</a></div><div class="ttdeci">#define CRYPTOPP_ASSERT(exp)</div><div class="ttdoc">Debugging and diagnostic assertion.</div><div class="ttdef"><b>Definition:</b> <a href="trap_8h_source.html#l00060">trap.h:60</a></div></div>
<div class="ttc" id="oaep_8h_html"><div class="ttname"><a href="oaep_8h.html">oaep.h</a></div><div class="ttdoc">Classes for optimal asymmetric encryption padding.</div></div>
<div class="ttc" id="class_o_a_e_p___base_html_a4c58ceb4c2de7b39ed2151fbe9942e73"><div class="ttname"><a href="class_o_a_e_p___base.html#a4c58ceb4c2de7b39ed2151fbe9942e73">OAEP_Base::MaxUnpaddedLength</a></div><div class="ttdeci">size_t MaxUnpaddedLength(size_t paddedLength) const</div><div class="ttdoc">max size of unpadded message in bytes, given max size of padded message in bits (1 less than size of ...</div><div class="ttdef"><b>Definition:</b> <a href="oaep_8cpp_source.html#l00015">oaep.cpp:15</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>
<div class="ttc" id="class_name_value_pairs_html_a5357c3a09602e44671d1e42cb9a9408d"><div class="ttname"><a href="class_name_value_pairs.html#a5357c3a09602e44671d1e42cb9a9408d">NameValuePairs::GetValue</a></div><div class="ttdeci">bool GetValue(const char *name, T &value) const</div><div class="ttdoc">Get a named value.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00347">cryptlib.h:347</a></div></div>
<div class="ttc" id="class_name_value_pairs_html"><div class="ttname"><a href="class_name_value_pairs.html">NameValuePairs</a></div><div class="ttdoc">Interface for retrieving values given their names.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l00290">cryptlib.h:290</a></div></div>
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