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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++: asn.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>asn.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// asn.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 "asn.h"</span><a name="l00008"></a>00008 <a name="l00009"></a>00009 <span class="preprocessor">#include <iomanip></span><a name="l00010"></a>00010 <span class="preprocessor">#include <time.h></span><a name="l00011"></a>00011 <a name="l00012"></a>00012 NAMESPACE_BEGIN(CryptoPP)<a name="l00013"></a>00013 USING_NAMESPACE(std)<a name="l00014"></a>00014 <span class="comment"></span><a name="l00015"></a>00015 <span class="comment">/// DER Length</span><a name="l00016"></a>00016 <span class="comment"></span><span class="keywordtype">size_t</span> DERLengthEncode(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt, lword length)<a name="l00017"></a>00017 {<a name="l00018"></a>00018 <span class="keywordtype">size_t</span> i=0;<a name="l00019"></a>00019 <span class="keywordflow">if</span> (length <= 0x7f)<a name="l00020"></a>00020 {<a name="l00021"></a>00021 bt.Put(byte(length));<a name="l00022"></a>00022 i++;<a name="l00023"></a>00023 }<a name="l00024"></a>00024 <span class="keywordflow">else</span><a name="l00025"></a>00025 {<a name="l00026"></a>00026 bt.Put(byte(BytePrecision(length) | 0x80));<a name="l00027"></a>00027 i++;<a name="l00028"></a>00028 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j=BytePrecision(length); j; --j)<a name="l00029"></a>00029 {<a name="l00030"></a>00030 bt.Put(byte(length >> (j-1)*8));<a name="l00031"></a>00031 i++;<a name="l00032"></a>00032 }<a name="l00033"></a>00033 }<a name="l00034"></a>00034 <span class="keywordflow">return</span> i;<a name="l00035"></a>00035 }<a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="keywordtype">bool</span> BERLengthDecode(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt, lword &length, <span class="keywordtype">bool</span> &definiteLength)<a name="l00038"></a>00038 {<a name="l00039"></a>00039 byte b;<a name="l00040"></a>00040 <a name="l00041"></a>00041 <span class="keywordflow">if</span> (!bt.<a class="code" href="class_buffered_transformation.html#9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Get</a>(b))<a name="l00042"></a>00042 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00043"></a>00043 <a name="l00044"></a>00044 <span class="keywordflow">if</span> (!(b & 0x80))<a name="l00045"></a>00045 {<a name="l00046"></a>00046 definiteLength = <span class="keyword">true</span>;<a name="l00047"></a>00047 length = b;<a name="l00048"></a>00048 }<a name="l00049"></a>00049 <span class="keywordflow">else</span><a name="l00050"></a>00050 {<a name="l00051"></a>00051 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> lengthBytes = b & 0x7f;<a name="l00052"></a>00052 <a name="l00053"></a>00053 <span class="keywordflow">if</span> (lengthBytes == 0)<a name="l00054"></a>00054 {<a name="l00055"></a>00055 definiteLength = <span class="keyword">false</span>;<a name="l00056"></a>00056 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00057"></a>00057 }<a name="l00058"></a>00058 <a name="l00059"></a>00059 definiteLength = <span class="keyword">true</span>;<a name="l00060"></a>00060 length = 0;<a name="l00061"></a>00061 <span class="keywordflow">while</span> (lengthBytes--)<a name="l00062"></a>00062 {<a name="l00063"></a>00063 <span class="keywordflow">if</span> (length >> (8*(<span class="keyword">sizeof</span>(length)-1)))<a name="l00064"></a>00064 BERDecodeError(); <span class="comment">// length about to overflow</span><a name="l00065"></a>00065 <a name="l00066"></a>00066 <span class="keywordflow">if</span> (!bt.<a class="code" href="class_buffered_transformation.html#9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Get</a>(b))<a name="l00067"></a>00067 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00068"></a>00068 <a name="l00069"></a>00069 length = (length << 8) | b;<a name="l00070"></a>00070 }<a name="l00071"></a>00071 }<a name="l00072"></a>00072 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00073"></a>00073 }<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keywordtype">bool</span> BERLengthDecode(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &bt, <span class="keywordtype">size_t</span> &length)<a name="l00076"></a>00076 {<a name="l00077"></a>00077 lword lw;<a name="l00078"></a>00078 <span class="keywordtype">bool</span> definiteLength;<a name="l00079"></a>00079 <span class="keywordflow">if</span> (!BERLengthDecode(bt, lw, definiteLength))<a name="l00080"></a>00080 BERDecodeError();<a name="l00081"></a>00081 <span class="keywordflow">if</span> (!SafeConvert(lw, length))<a name="l00082"></a>00082 BERDecodeError();<a name="l00083"></a>00083 <span class="keywordflow">return</span> definiteLength;<a name="l00084"></a>00084 }<a name="l00085"></a>00085 <a name="l00086"></a>00086 <span class="keywordtype">void</span> DEREncodeNull(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &out)<a name="l00087"></a>00087 {<a name="l00088"></a>00088 out.<a class="code" href="class_buffered_transformation.html#e70658b0d271f8e114ac6c3cc9774ede" title="input a byte for processing">Put</a>(TAG_NULL);<a name="l00089"></a>00089 out.<a class="code" href="class_buffered_transformation.html#e70658b0d271f8e114ac6c3cc9774ede" title="input a byte for processing">Put</a>(0);<a name="l00090"></a>00090 }<a name="l00091"></a>00091 <a name="l00092"></a>00092 <span class="keywordtype">void</span> BERDecodeNull(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &in)<a name="l00093"></a>00093 {<a name="l00094"></a>00094 byte b;<a name="l00095"></a>00095 <span class="keywordflow">if</span> (!in.<a class="code" href="class_buffered_transformation.html#9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Get</a>(b) || b != TAG_NULL)<a name="l00096"></a>00096 BERDecodeError();<a name="l00097"></a>00097 <span class="keywordtype">size_t</span> length;⌨️ 快捷键说明
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