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<div class="title">sigcache.cpp</div> </div>
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<a href="sigcache_8cpp.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">// Copyright (c) 2009-2010 Satoshi Nakamoto</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright (c) 2009-2015 The Bitcoin Core developers</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Distributed under the MIT software license, see the accompanying</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// file COPYING or http://www.opensource.org/licenses/mit-license.php.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="sigcache_8h.html">sigcache.h</a>"</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "<a class="code" href="memusage_8h.html">memusage.h</a>"</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="pubkey_8h.html">pubkey.h</a>"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "<a class="code" href="random_8h.html">random.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "<a class="code" href="uint256_8h.html">uint256.h</a>"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "util.h"</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">#include <boost/thread.hpp></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <boost/unordered_set.hpp></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>{</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">class </span>CSignatureCacheHasher</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="keywordtype">size_t</span> operator()(<span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a>& <a class="code" href="namespaceextract__strings__qt.html#a1b7a78cde0039f63310f11692b713dca">key</a>)<span class="keyword"> const </span>{</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceextract__strings__qt.html#a1b7a78cde0039f63310f11692b713dca">key</a>.GetCheapHash();</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> };</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">class </span>CSignatureCache</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> <span class="keyword">private</span>:</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <a class="code" href="classuint256.html">uint256</a> nonce;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">typedef</span> boost::unordered_set<uint256, CSignatureCacheHasher> map_type;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  map_type setValid;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  boost::shared_mutex cs_sigcache;</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> <span class="keyword">public</span>:</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  CSignatureCache()</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <a class="code" href="random_8cpp.html#ada0c29949c4d1ac0cc027d93c4771423">GetRandBytes</a>(nonce.<a class="code" href="classbase__blob.html#aeee68e00ceeacf49086e98b661e017ff">begin</a>(), 32);</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> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  ComputeEntry(<a class="code" href="classuint256.html">uint256</a>& entry, <span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a> &hash, <span class="keyword">const</span> std::vector<unsigned char>& vchSig, <span class="keyword">const</span> <a class="code" href="classCPubKey.html">CPubKey</a>& pubkey)</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <a class="code" href="classCSHA256.html">CSHA256</a>().<a class="code" href="classCSHA256.html#a9d7de520a562655da85349372820c883">Write</a>(nonce.<a class="code" href="classbase__blob.html#aeee68e00ceeacf49086e98b661e017ff">begin</a>(), 32).Write(hash.<a class="code" href="classbase__blob.html#aeee68e00ceeacf49086e98b661e017ff">begin</a>(), 32).Write(&pubkey[0], pubkey.<a class="code" href="classCPubKey.html#a6bb28fcf0a5f799c69f5b7269363b309">size</a>()).Write(&vchSig[0], vchSig.size()).Finalize(entry.<a class="code" href="classbase__blob.html#aeee68e00ceeacf49086e98b661e017ff">begin</a>());</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> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">bool</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  Get(<span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a>& entry)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">return</span> setValid.count(entry);</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</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>  <span class="keywordtype">void</span> Erase(<span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a>& entry)</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  boost::unique_lock<boost::shared_mutex> lock(cs_sigcache);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  setValid.erase(entry);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  }</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>  <span class="keywordtype">void</span> Set(<span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a>& entry)</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="keywordtype">size_t</span> nMaxCacheSize = <a class="code" href="util_8cpp.html#a24f685720bf40370e5bd2a192ad50cd8">GetArg</a>(<span class="stringliteral">"-maxsigcachesize"</span>, <a class="code" href="sigcache_8h.html#ab5c5718451a42313f1cd8e1e076802c1">DEFAULT_MAX_SIG_CACHE_SIZE</a>) * ((size_t) 1 << 20);</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span> (nMaxCacheSize <= 0) <span class="keywordflow">return</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>  boost::unique_lock<boost::shared_mutex> lock(cs_sigcache);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">while</span> (<a class="code" href="namespacememusage.html#a24d4e7ba4b087b7c854e819c37e20ea0">memusage::DynamicUsage</a>(setValid) > nMaxCacheSize)</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>  map_type::size_type s = <a class="code" href="random_8cpp.html#a27d9149d522b1fa87d84e5e9ca902aef">GetRand</a>(setValid.bucket_count());</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  map_type::local_iterator it = setValid.begin(s);</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (it != setValid.end(s)) {</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  setValid.erase(*it);</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> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  setValid.insert(entry);</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> };</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </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> </div><div class="line"><a name="l00092"></a><span class="lineno"><a class="line" href="classCachingTransactionSignatureChecker.html#a8fb5c049a2f0ef3d4d3fbfeea88b7b53"> 92</a></span> <span class="keywordtype">bool</span> <a class="code" href="classCachingTransactionSignatureChecker.html#a8fb5c049a2f0ef3d4d3fbfeea88b7b53">CachingTransactionSignatureChecker::VerifySignature</a>(<span class="keyword">const</span> std::vector<unsigned char>& vchSig, <span class="keyword">const</span> <a class="code" href="classCPubKey.html">CPubKey</a>& pubkey, <span class="keyword">const</span> <a class="code" href="classuint256.html">uint256</a>& sighash)<span class="keyword"> const</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="keyword"></span>{</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">static</span> CSignatureCache signatureCache;</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>  <a class="code" href="classuint256.html">uint256</a> entry;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  signatureCache.ComputeEntry(entry, sighash, vchSig, pubkey);</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>  <span class="keywordflow">if</span> (signatureCache.Get(entry)) {</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (!<a class="code" href="classCachingTransactionSignatureChecker.html#a159328766da77e5d04e558f0c1c19750">store</a>) {</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  signatureCache.Erase(entry);</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (!<a class="code" href="classTransactionSignatureChecker.html#a8691f10179573b1421defe3843c04c96">TransactionSignatureChecker::VerifySignature</a>(vchSig, pubkey, sighash))</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (<a class="code" href="classCachingTransactionSignatureChecker.html#a159328766da77e5d04e558f0c1c19750">store</a>) {</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  signatureCache.Set(entry);</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div><div class="ttc" id="classCPubKey_html_a6bb28fcf0a5f799c69f5b7269363b309"><div class="ttname"><a href="classCPubKey.html#a6bb28fcf0a5f799c69f5b7269363b309">CPubKey::size</a></div><div class="ttdeci">unsigned int size() const</div><div class="ttdoc">Simple read-only vector-like interface to the pubkey data. </div><div class="ttdef"><b>Definition:</b> <a href="pubkey_8h_source.html#l00095">pubkey.h:95</a></div></div>
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<div class="ttc" id="pubkey_8h_html"><div class="ttname"><a href="pubkey_8h.html">pubkey.h</a></div></div>
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<div class="ttc" id="sigcache_8h_html_ab5c5718451a42313f1cd8e1e076802c1"><div class="ttname"><a href="sigcache_8h.html#ab5c5718451a42313f1cd8e1e076802c1">DEFAULT_MAX_SIG_CACHE_SIZE</a></div><div class="ttdeci">static const unsigned int DEFAULT_MAX_SIG_CACHE_SIZE</div><div class="ttdef"><b>Definition:</b> <a href="sigcache_8h_source.html#l00015">sigcache.h:15</a></div></div>
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<div class="ttc" id="sigcache_8h_html"><div class="ttname"><a href="sigcache_8h.html">sigcache.h</a></div></div>
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<div class="ttc" id="namespacememusage_html_a24d4e7ba4b087b7c854e819c37e20ea0"><div class="ttname"><a href="namespacememusage.html#a24d4e7ba4b087b7c854e819c37e20ea0">memusage::DynamicUsage</a></div><div class="ttdeci">static size_t DynamicUsage(const int8_t &v)</div><div class="ttdef"><b>Definition:</b> <a href="memusage_8h_source.html#l00025">memusage.h:25</a></div></div>
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<div class="ttc" id="classbase__blob_html_aeee68e00ceeacf49086e98b661e017ff"><div class="ttname"><a href="classbase__blob.html#aeee68e00ceeacf49086e98b661e017ff">base_blob::begin</a></div><div class="ttdeci">unsigned char * begin()</div><div class="ttdef"><b>Definition:</b> <a href="uint256_8h_source.html#l00055">uint256.h:55</a></div></div>
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<div class="ttc" id="memusage_8h_html"><div class="ttname"><a href="memusage_8h.html">memusage.h</a></div></div>
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<div class="ttc" id="classCachingTransactionSignatureChecker_html_a159328766da77e5d04e558f0c1c19750"><div class="ttname"><a href="classCachingTransactionSignatureChecker.html#a159328766da77e5d04e558f0c1c19750">CachingTransactionSignatureChecker::store</a></div><div class="ttdeci">bool store</div><div class="ttdef"><b>Definition:</b> <a href="sigcache_8h_source.html#l00022">sigcache.h:22</a></div></div>
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<div class="ttc" id="classuint256_html"><div class="ttname"><a href="classuint256.html">uint256</a></div><div class="ttdef"><b>Definition:</b> <a href="uint256_8h_source.html#l00114">uint256.h:114</a></div></div>
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<div class="ttc" id="classCSHA256_html_a9d7de520a562655da85349372820c883"><div class="ttname"><a href="classCSHA256.html#a9d7de520a562655da85349372820c883">CSHA256::Write</a></div><div class="ttdeci">CSHA256 & Write(const unsigned char *data, size_t len)</div><div class="ttdef"><b>Definition:</b> <a href="sha256_8cpp_source.html#l00141">sha256.cpp:141</a></div></div>
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<div class="ttc" id="uint256_8h_html"><div class="ttname"><a href="uint256_8h.html">uint256.h</a></div></div>
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<div class="ttc" id="classTransactionSignatureChecker_html_a8691f10179573b1421defe3843c04c96"><div class="ttname"><a href="classTransactionSignatureChecker.html#a8691f10179573b1421defe3843c04c96">TransactionSignatureChecker::VerifySignature</a></div><div class="ttdeci">virtual bool VerifySignature(const std::vector< unsigned char > &vchSig, const CPubKey &vchPubKey, const uint256 &sighash) const</div><div class="ttdef"><b>Definition:</b> <a href="interpreter_8cpp_source.html#l01134">interpreter.cpp:1134</a></div></div>
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<div class="ttc" id="random_8cpp_html_ada0c29949c4d1ac0cc027d93c4771423"><div class="ttname"><a href="random_8cpp.html#ada0c29949c4d1ac0cc027d93c4771423">GetRandBytes</a></div><div class="ttdeci">void GetRandBytes(unsigned char *buf, int num)</div><div class="ttdef"><b>Definition:</b> <a href="random_8cpp_source.html#l00086">random.cpp:86</a></div></div>
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<div class="ttc" id="classCPubKey_html"><div class="ttname"><a href="classCPubKey.html">CPubKey</a></div><div class="ttdef"><b>Definition:</b> <a href="pubkey_8h_source.html#l00037">pubkey.h:37</a></div></div>
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<div class="ttc" id="classCachingTransactionSignatureChecker_html_a8fb5c049a2f0ef3d4d3fbfeea88b7b53"><div class="ttname"><a href="classCachingTransactionSignatureChecker.html#a8fb5c049a2f0ef3d4d3fbfeea88b7b53">CachingTransactionSignatureChecker::VerifySignature</a></div><div class="ttdeci">bool VerifySignature(const std::vector< unsigned char > &vchSig, const CPubKey &vchPubKey, const uint256 &sighash) const</div><div class="ttdef"><b>Definition:</b> <a href="sigcache_8cpp_source.html#l00092">sigcache.cpp:92</a></div></div>
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<div class="ttc" id="util_8cpp_html_a24f685720bf40370e5bd2a192ad50cd8"><div class="ttname"><a href="util_8cpp.html#a24f685720bf40370e5bd2a192ad50cd8">GetArg</a></div><div class="ttdeci">std::string GetArg(const std::string &strArg, const std::string &strDefault)</div><div class="ttdef"><b>Definition:</b> <a href="util_8cpp_source.html#l00441">util.cpp:441</a></div></div>
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<div class="ttc" id="random_8h_html"><div class="ttname"><a href="random_8h.html">random.h</a></div></div>
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<div class="ttc" id="classCSHA256_html"><div class="ttname"><a href="classCSHA256.html">CSHA256</a></div><div class="ttdef"><b>Definition:</b> <a href="sha256_8h_source.html#l00012">sha256.h:12</a></div></div>
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<div class="ttc" id="namespaceextract__strings__qt_html_a1b7a78cde0039f63310f11692b713dca"><div class="ttname"><a href="namespaceextract__strings__qt.html#a1b7a78cde0039f63310f11692b713dca">extract_strings_qt.key</a></div><div class="ttdeci">key</div><div class="ttdef"><b>Definition:</b> <a href="extract__strings__qt_8py_source.html#l00073">extract_strings_qt.py:73</a></div></div>
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<div class="ttc" id="random_8cpp_html_a27d9149d522b1fa87d84e5e9ca902aef"><div class="ttname"><a href="random_8cpp.html#a27d9149d522b1fa87d84e5e9ca902aef">GetRand</a></div><div class="ttdeci">uint64_t GetRand(uint64_t nMax)</div><div class="ttdef"><b>Definition:</b> <a href="random_8cpp_source.html#l00094">random.cpp:94</a></div></div>
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