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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: dsa.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>dsa.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// dsa.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span><a name="l00006"></a>00006 <span class="preprocessor"></span><a name="l00007"></a>00007 <span class="preprocessor">#include "<a class="code" href="dsa_8h.html">dsa.h</a>"</span><a name="l00008"></a>00008 <span class="preprocessor">#include "nbtheory.h"</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 NAMESPACE_BEGIN(CryptoPP)<a name="l00011"></a>00011 <a name="l00012"></a><a class="code" href="dsa_8h.html#23661b9fd140d90749d334eb4bf59d02">00012</a> size_t DSAConvertSignatureFormat(byte *buffer, <span class="keywordtype">size_t</span> bufferSize, <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a> toFormat, const byte *signature, <span class="keywordtype">size_t</span> signatureLen, <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94">DSASignatureFormat</a> fromFormat)<a name="l00013"></a>00013 {<a name="l00014"></a>00014 <a class="code" href="class_integer.html" title="multiple precision integer and basic arithmetics">Integer</a> r, s;<a name="l00015"></a>00015 <a class="code" href="class_string_store.html" title="string-based implementation of Store interface">StringStore</a> store(signature, signatureLen);<a name="l00016"></a>00016 <a class="code" href="class_array_sink.html" title="Copy input to a memory buffer.">ArraySink</a> sink(buffer, bufferSize);<a name="l00017"></a>00017 <a name="l00018"></a>00018 <span class="keywordflow">switch</span> (fromFormat)<a name="l00019"></a>00019 {<a name="l00020"></a>00020 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94c021b0f700ffc5a1a60fbe1b3306b58a">DSA_P1363</a>:<a name="l00021"></a>00021 r.<a class="code" href="class_integer.html#e91fee9e9873f3412f47e6d647545099">Decode</a>(store, signatureLen/2);<a name="l00022"></a>00022 s.<a class="code" href="class_integer.html#e91fee9e9873f3412f47e6d647545099">Decode</a>(store, signatureLen/2);<a name="l00023"></a>00023 <span class="keywordflow">break</span>;<a name="l00024"></a>00024 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94ca50e4543c82e6ae2f04358592c569d7">DSA_DER</a>:<a name="l00025"></a>00025 {<a name="l00026"></a>00026 <a class="code" href="class_b_e_r_sequence_decoder.html" title="BER Sequence Decoder.">BERSequenceDecoder</a> seq(store);<a name="l00027"></a>00027 r.<a class="code" href="class_integer.html#810fc0382f8928893fe192ab79b1972c">BERDecode</a>(seq);<a name="l00028"></a>00028 s.<a class="code" href="class_integer.html#810fc0382f8928893fe192ab79b1972c">BERDecode</a>(seq);<a name="l00029"></a>00029 seq.<a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">MessageEnd</a>();<a name="l00030"></a>00030 <span class="keywordflow">break</span>;<a name="l00031"></a>00031 }<a name="l00032"></a>00032 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94b6a0ff8c8d8721382dbb821397609b18">DSA_OPENPGP</a>:<a name="l00033"></a>00033 r.<a class="code" href="class_integer.html#4b2415221b6eb9ffde8c9c495ae098f2">OpenPGPDecode</a>(store);<a name="l00034"></a>00034 s.<a class="code" href="class_integer.html#4b2415221b6eb9ffde8c9c495ae098f2">OpenPGPDecode</a>(store);<a name="l00035"></a>00035 <span class="keywordflow">break</span>;<a name="l00036"></a>00036 }<a name="l00037"></a>00037 <a name="l00038"></a>00038 <span class="keywordflow">switch</span> (toFormat)<a name="l00039"></a>00039 {<a name="l00040"></a>00040 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94c021b0f700ffc5a1a60fbe1b3306b58a">DSA_P1363</a>:<a name="l00041"></a>00041 r.<a class="code" href="class_integer.html#c12ea467de9a609b86ec03d8cb8837e4" title="encode in big-endian format">Encode</a>(sink, bufferSize/2);<a name="l00042"></a>00042 s.<a class="code" href="class_integer.html#c12ea467de9a609b86ec03d8cb8837e4" title="encode in big-endian format">Encode</a>(sink, bufferSize/2);<a name="l00043"></a>00043 <span class="keywordflow">break</span>;<a name="l00044"></a>00044 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94ca50e4543c82e6ae2f04358592c569d7">DSA_DER</a>:<a name="l00045"></a>00045 {<a name="l00046"></a>00046 <a class="code" href="class_d_e_r_sequence_encoder.html" title="DER Sequence Encoder.">DERSequenceEncoder</a> seq(sink);<a name="l00047"></a>00047 r.<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(seq);<a name="l00048"></a>00048 s.<a class="code" href="class_integer.html#6ab51a05bee88cfa690179611e8a084e" title="encode using Distinguished Encoding Rules, put result into a BufferedTransformation...">DEREncode</a>(seq);<a name="l00049"></a>00049 seq.<a class="code" href="class_d_e_r_general_encoder.html#cb5f1a94ba97027c603b019bd5228510">MessageEnd</a>();<a name="l00050"></a>00050 <span class="keywordflow">break</span>;<a name="l00051"></a>00051 }<a name="l00052"></a>00052 <span class="keywordflow">case</span> <a class="code" href="dsa_8h.html#a37ccfd70d4cc99ec03ebb6f9075fc94b6a0ff8c8d8721382dbb821397609b18">DSA_OPENPGP</a>:⌨️ 快捷键说明
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