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<a href="randpool_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">// randpool.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">// OldRandPool added by JW in August, 2017.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"></span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/// \file randpool.h</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">/// \brief Class file for Randomness Pool</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">/// \details RandomPool can be used to generate cryptographic quality pseudorandom bytes</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">/// after seeding the pool with IncorporateEntropy(). Internally, the generator uses</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/// AES-256 to produce the stream. Entropy is stirred in using SHA-256.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/// \details RandomPool used to follow the design of randpool in PGP 2.6.x. At version 5.5</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/// RandomPool was redesigned to reduce the risk of reusing random numbers after state</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">/// rollback (which may occur when running in a virtual machine like VMware or a hosted</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">/// environment).</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">/// \details If you need the pre-Crypto++ 5.5 generator then use OldRandomPool class. You</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/// should migrate away from OldRandomPool at the earliest opportunity. Use RandomPool</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/// or AutoSeededRandomPool instead.</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/// \since Crypto++ 4.0 (PGP 2.6.x style), Crypto++ 5.5 (AES-256 based)</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#ifndef CRYPTOPP_RANDPOOL_H</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#define CRYPTOPP_RANDPOOL_H</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include "<a class="code" href="cryptlib_8h.html">cryptlib.h</a>"</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include "<a class="code" href="filters_8h.html">filters.h</a>"</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "<a class="code" href="secblock_8h.html">secblock.h</a>"</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="smartptr_8h.html">smartptr.h</a>"</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="aes_8h.html">aes.h</a>"</span></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> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/// \brief Randomness Pool based on AES-256</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"></span><span class="comment">/// \details RandomPool can be used to generate cryptographic quality pseudorandom bytes</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"></span><span class="comment">/// after seeding the pool with IncorporateEntropy(). Internally, the generator uses</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"></span><span class="comment">/// AES-256 to produce the stream. Entropy is stirred in using SHA-256.</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"></span><span class="comment">/// \details RandomPool used to follow the design of randpool in PGP 2.6.x. At version 5.5</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span><span class="comment">/// RandomPool was redesigned to reduce the risk of reusing random numbers after state</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"></span><span class="comment">/// rollback, which may occur when running in a virtual machine like VMware or a hosted</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span><span class="comment">/// environment.</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"></span><span class="comment">/// \details If you need the pre-Crypto++ 5.5 generator then use OldRandomPool class. You</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span><span class="comment">/// should migrate away from OldRandomPool at the earliest opportunity.</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"></span><span class="comment">/// \sa OldRandomPool</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"></span><span class="comment">/// \since Crypto++ 4.0 (PGP 2.6.x style), Crypto++ 5.5 (AES-256 based)</span></div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="class_random_pool.html"> 41</a></span> <span class="comment"></span>class CRYPTOPP_DLL <a class="code" href="class_random_pool.html">RandomPool</a> : public <a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a>, public <a class="code" href="class_not_copyable.html">NotCopyable</a></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">public</span>:<span class="comment"></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> /// \brief Construct a RandomPool</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"></span> <a class="code" href="class_random_pool.html">RandomPool</a>();</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="class_random_pool.html#a13cd8575fe2840c8a71f6a6b6439c9df"> 47</a></span>  <span class="keywordtype">bool</span> <a class="code" href="class_random_pool.html#a13cd8575fe2840c8a71f6a6b6439c9df">CanIncorporateEntropy</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">void</span> IncorporateEntropy(<span class="keyword">const</span> <span class="keywordtype">byte</span> *input, <span class="keywordtype">size_t</span> length);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">void</span> GenerateIntoBufferedTransformation(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &target, <span class="keyword">const</span> std::string &channel, lword size);</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="keyword">private</span>:</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="class_fixed_size_aligned_sec_block.html">FixedSizeAlignedSecBlock<byte, 16, true></a> m_seed;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <a class="code" href="class_fixed_size_aligned_sec_block.html">FixedSizeAlignedSecBlock<byte, 32></a> m_key;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <a class="code" href="classmember__ptr.html">member_ptr<BlockCipher></a> m_pCipher;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">bool</span> m_keySet;</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"></span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">/// \brief Randomness Pool based on PGP 2.6.x with MDC</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">/// \details If you need the pre-Crypto++ 5.5 generator then use OldRandomPool class. The</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">/// OldRandomPool class is always available so you dont need to define</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">/// CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY. OldRandomPool also provides the modern</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">/// interface, including <tt>CanIncorporateEntropy</tt>, <tt>IncorporateEntropy</tt> and</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">/// <tt>GenerateIntoBufferedTransformation</tt>.</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">/// \details You should migrate away from OldRandomPool at the earliest opportunity. Use a</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/// modern random number generator or key derivation function, like AutoSeededRandomPool or</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">/// HKDF.</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">/// \warning This class uses an old style PGP 2.6.x with MDC. The generator risks reusing</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">/// random random numbers after state rollback. You should migrate away from OldRandomPool</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">/// at the earliest opportunity.</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">/// \sa RandomPool, AutoSeededRandomPool, HKDF, P1363_KDF2, PKCS12_PBKDF, PKCS5_PBKDF2_HMAC</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">/// \since Crypto++ 6.0 (PGP 2.6.x style)</span></div><div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="class_old_random_pool.html"> 72</a></span> <span class="comment"></span><span class="keyword">class </span>CRYPTOPP_DLL <a class="code" href="class_old_random_pool.html">OldRandomPool</a> : <span class="keyword">public</span> <a class="code" href="class_random_number_generator.html">RandomNumberGenerator</a></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">public</span>:<span class="comment"></span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> /// \brief Construct an OldRandomPool</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> /// \param poolSize internal pool size of the generator</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> /// \details poolSize must be greater than 16</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"></span> <a class="code" href="class_old_random_pool.html">OldRandomPool</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> poolSize=384);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// RandomNumberGenerator interface (Crypto++ 5.5 and above)</span></div><div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="class_old_random_pool.html#a5f623f029d4ae948eecd1fcc8c9065a6"> 81</a></span>  <span class="keywordtype">bool</span> <a class="code" href="class_old_random_pool.html#a5f623f029d4ae948eecd1fcc8c9065a6">CanIncorporateEntropy</a>()<span class="keyword"> const </span>{<span class="keywordflow">return</span> <span class="keyword">true</span>;}</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">void</span> <a class="code" href="class_random_number_generator.html#a6feb4f0afedb62a495b7a9ae311fa1cb">IncorporateEntropy</a>(<span class="keyword">const</span> <span class="keywordtype">byte</span> *input, <span class="keywordtype">size_t</span> length);</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">void</span> <a class="code" href="class_random_number_generator.html#a5cc474006e2c7383ec20cc4d0c2abbaf">GenerateIntoBufferedTransformation</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> &target, <span class="keyword">const</span> std::string &channel, lword size);</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="keywordtype">byte</span> <a class="code" href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">GenerateByte</a>();</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">void</span> <a class="code" href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17">GenerateBlock</a>(<span class="keywordtype">byte</span> *output, <span class="keywordtype">size_t</span> size);</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="keyword">protected</span>:</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">void</span> Stir();</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> <span class="keyword">private</span>:</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <a class="code" href="class_sec_byte_block.html">SecByteBlock</a> pool, key;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">size_t</span> addPos, getPos;</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_random_pool_html"><div class="ttname"><a href="class_random_pool.html">RandomPool</a></div><div class="ttdoc">Randomness Pool based on AES-256.</div><div class="ttdef"><b>Definition:</b> <a href="randpool_8h_source.html#l00041">randpool.h:41</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_old_random_pool_html"><div class="ttname"><a href="class_old_random_pool.html">OldRandomPool</a></div><div class="ttdoc">Randomness Pool based on PGP 2.6.x with MDC.</div><div class="ttdef"><b>Definition:</b> <a href="randpool_8h_source.html#l00072">randpool.h:72</a></div></div>
<div class="ttc" id="class_random_pool_html_a13cd8575fe2840c8a71f6a6b6439c9df"><div class="ttname"><a href="class_random_pool.html#a13cd8575fe2840c8a71f6a6b6439c9df">RandomPool::CanIncorporateEntropy</a></div><div class="ttdeci">bool CanIncorporateEntropy() const</div><div class="ttdoc">Determines if a generator can accept additional entropy.</div><div class="ttdef"><b>Definition:</b> <a href="randpool_8h_source.html#l00047">randpool.h:47</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="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="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="class_buffered_transformation_html"><div class="ttname"><a href="class_buffered_transformation.html">BufferedTransformation</a></div><div class="ttdoc">Interface for buffered transformations.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01545">cryptlib.h:1545</a></div></div>
<div class="ttc" id="classmember__ptr_html"><div class="ttname"><a href="classmember__ptr.html">member_ptr< BlockCipher ></a></div></div>
<div class="ttc" id="secblock_8h_html"><div class="ttname"><a href="secblock_8h.html">secblock.h</a></div><div class="ttdoc">Classes and functions for secure memory allocations.</div></div>
<div class="ttc" id="class_old_random_pool_html_a5f623f029d4ae948eecd1fcc8c9065a6"><div class="ttname"><a href="class_old_random_pool.html#a5f623f029d4ae948eecd1fcc8c9065a6">OldRandomPool::CanIncorporateEntropy</a></div><div class="ttdeci">bool CanIncorporateEntropy() const</div><div class="ttdoc">Determines if a generator can accept additional entropy.</div><div class="ttdef"><b>Definition:</b> <a href="randpool_8h_source.html#l00081">randpool.h:81</a></div></div>
<div class="ttc" id="aes_8h_html"><div class="ttname"><a href="aes_8h.html">aes.h</a></div><div class="ttdoc">Class file for the AES cipher (Rijndael)</div></div>
<div class="ttc" id="class_fixed_size_aligned_sec_block_html"><div class="ttname"><a href="class_fixed_size_aligned_sec_block.html">FixedSizeAlignedSecBlock< byte, 16, true ></a></div></div>
<div class="ttc" id="class_random_number_generator_html_ada0f7c437b0c8e6ba94ebcd75bff4bda"><div class="ttname"><a href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">RandomNumberGenerator::GenerateByte</a></div><div class="ttdeci">virtual byte GenerateByte()</div><div class="ttdoc">Generate new random byte and return it.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00282">cryptlib.cpp:282</a></div></div>
<div class="ttc" id="filters_8h_html"><div class="ttname"><a href="filters_8h.html">filters.h</a></div><div class="ttdoc">Implementation of BufferedTransformation's attachment interface.</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_not_copyable_html"><div class="ttname"><a href="class_not_copyable.html">NotCopyable</a></div><div class="ttdoc">Ensures an object is not copyable.</div><div class="ttdef"><b>Definition:</b> <a href="misc_8h_source.html#l00228">misc.h:228</a></div></div>
<div class="ttc" id="class_random_number_generator_html_a5cc474006e2c7383ec20cc4d0c2abbaf"><div class="ttname"><a href="class_random_number_generator.html#a5cc474006e2c7383ec20cc4d0c2abbaf">RandomNumberGenerator::GenerateIntoBufferedTransformation</a></div><div class="ttdeci">virtual void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword length)</div><div class="ttdoc">Generate random bytes into a BufferedTransformation.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8cpp_source.html#l00330">cryptlib.cpp:330</a></div></div>
<div class="ttc" id="class_random_number_generator_html_a6feb4f0afedb62a495b7a9ae311fa1cb"><div class="ttname"><a href="class_random_number_generator.html#a6feb4f0afedb62a495b7a9ae311fa1cb">RandomNumberGenerator::IncorporateEntropy</a></div><div class="ttdeci">virtual void IncorporateEntropy(const byte *input, size_t length)</div><div class="ttdoc">Update RNG state with additional unpredictable values.</div><div class="ttdef"><b>Definition:</b> <a href="cryptlib_8h_source.html#l01343">cryptlib.h:1343</a></div></div>
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