📄 rc6_8cpp-source.html
字号:
<!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++: rc6.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>rc6.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// rc6.cpp - written and placed in the public domain by Sean Woods</span><a name="l00002"></a>00002 <span class="comment">// based on Wei Dai's RC5 code.</span><a name="l00003"></a>00003 <a name="l00004"></a>00004 <span class="preprocessor">#include "pch.h"</span><a name="l00005"></a>00005 <span class="preprocessor">#include "<a class="code" href="rc6_8h.html">rc6.h</a>"</span><a name="l00006"></a>00006 <span class="preprocessor">#include "misc.h"</span><a name="l00007"></a>00007 <a name="l00008"></a>00008 NAMESPACE_BEGIN(CryptoPP)<a name="l00009"></a>00009 <a name="l00010"></a>00010 void <a class="code" href="class_r_c6.html" title="RC6">RC6</a>::Base::UncheckedSetKey(const byte *k, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen, const <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &params)<a name="l00011"></a>00011 {<a name="l00012"></a>00012 AssertValidKeyLength(keylen);<a name="l00013"></a>00013 <a name="l00014"></a>00014 r = GetRoundsAndThrowIfInvalid(params, <span class="keyword">this</span>);<a name="l00015"></a>00015 sTable.New(2*(r+2));<a name="l00016"></a>00016 <a name="l00017"></a>00017 <span class="keyword">static</span> <span class="keyword">const</span> RC6_WORD MAGIC_P = 0xb7e15163L; <span class="comment">// magic constant P for wordsize</span><a name="l00018"></a>00018 <span class="keyword">static</span> <span class="keyword">const</span> RC6_WORD MAGIC_Q = 0x9e3779b9L; <span class="comment">// magic constant Q for wordsize</span><a name="l00019"></a>00019 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> U=<span class="keyword">sizeof</span>(RC6_WORD);<a name="l00020"></a>00020 <a name="l00021"></a>00021 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> c = STDMAX((keylen+U-1)/U, 1U); <span class="comment">// RC6 paper says c=1 if keylen==0</span><a name="l00022"></a>00022 <a class="code" href="class_sec_block.html" title="a block of memory allocated using A">SecBlock<RC6_WORD></a> l(c);<a name="l00023"></a>00023 <a name="l00024"></a>00024 GetUserKey(<a class="code" href="cryptlib_8h.html#aeb92d42f5a6e27b8ba19f18d69d142bccd5b3585bd07d6bdae383aa8271b9d2">LITTLE_ENDIAN_ORDER</a>, l.begin(), c, k, keylen);<a name="l00025"></a>00025 <a name="l00026"></a>00026 sTable[0] = MAGIC_P;<a name="l00027"></a>00027 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> j=1; j<sTable.size();j++)<a name="l00028"></a>00028 sTable[j] = sTable[j-1] + MAGIC_Q;<a name="l00029"></a>00029 <a name="l00030"></a>00030 RC6_WORD a=0, b=0;<a name="l00031"></a>00031 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> n = 3*STDMAX((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)sTable.size(), c);<a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> h=0; h < n; h++)<a name="l00034"></a>00034 {<a name="l00035"></a>00035 a = sTable[h % sTable.size()] = rotlFixed((sTable[h % sTable.size()] + a + b), 3);<a name="l00036"></a>00036 b = l[h % c] = rotlMod((l[h % c] + a + b), (a+b));<a name="l00037"></a>00037 }<a name="l00038"></a>00038 }<a name="l00039"></a>00039 <a name="l00040"></a>00040 <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<RC6::RC6_WORD, LittleEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;<a name="l00041"></a>00041 <a name="l00042"></a>00042 <span class="keywordtype">void</span> RC6::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span><a name="l00043"></a>00043 <span class="keyword"></span>{<a name="l00044"></a>00044 <span class="keyword">const</span> RC6_WORD *sptr = sTable;<a name="l00045"></a>00045 RC6_WORD a, b, c, d, t, u;<a name="l00046"></a>00046 <a name="l00047"></a>00047 <a class="code" href="struct_block_get_and_put.html#07781cc0817613fe47e8070999cf4b95">Block::Get</a>(inBlock)(a)(b)(c)(d);<a name="l00048"></a>00048 b += sptr[0];<a name="l00049"></a>00049 d += sptr[1];<a name="l00050"></a>00050 sptr += 2;<a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> i=0; i<r; i++)<a name="l00053"></a>00053 {<a name="l00054"></a>00054 t = rotlFixed(b*(2*b+1), 5);<a name="l00055"></a>00055 u = rotlFixed(d*(2*d+1), 5);<a name="l00056"></a>00056 a = rotlMod(a^t,u) + sptr[0];<a name="l00057"></a>00057 c = rotlMod(c^u,t) + sptr[1];<a name="l00058"></a>00058 t = a; a = b; b = c; c = d; d = t;<a name="l00059"></a>00059 sptr += 2;<a name="l00060"></a>00060 }<a name="l00061"></a>00061 <a name="l00062"></a>00062 a += sptr[0];<a name="l00063"></a>00063 c += sptr[1];<a name="l00064"></a>00064 <a name="l00065"></a>00065 <a class="code" href="struct_block_get_and_put.html#63d96a17e8118407e02896d0b0f8d92d">Block::Put</a>(xorBlock, outBlock)(a)(b)(c)(d);<a name="l00066"></a>00066 }<a name="l00067"></a>00067 <a name="l00068"></a>00068 <span class="keywordtype">void</span> RC6::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span><a name="l00069"></a>00069 <span class="keyword"></span>{<a name="l00070"></a>00070 <span class="keyword">const</span> RC6_WORD *sptr = sTable.end();<a name="l00071"></a>00071 RC6_WORD a, b, c, d, t, u;<a name="l00072"></a>00072 <a name="l00073"></a>00073 <a class="code" href="struct_block_get_and_put.html#07781cc0817613fe47e8070999cf4b95">Block::Get</a>(inBlock)(a)(b)(c)(d);<a name="l00074"></a>00074 <a name="l00075"></a>00075 sptr -= 2;<a name="l00076"></a>00076 c -= sptr[1];<a name="l00077"></a>00077 a -= sptr[0];<a name="l00078"></a>00078 <a name="l00079"></a>00079 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i < r; i++)<a name="l00080"></a>00080 {<a name="l00081"></a>00081 sptr -= 2;<a name="l00082"></a>00082 t = a; a = d; d = c; c = b; b = t;<a name="l00083"></a>00083 u = rotlFixed(d*(2*d+1), 5);<a name="l00084"></a>00084 t = rotlFixed(b*(2*b+1), 5);<a name="l00085"></a>00085 c = rotrMod(c-sptr[1], t) ^ u;<a name="l00086"></a>00086 a = rotrMod(a-sptr[0], u) ^ t;<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00089"></a>00089 sptr -= 2;<a name="l00090"></a>00090 d -= sTable[1];<a name="l00091"></a>00091 b -= sTable[0];<a name="l00092"></a>00092 <a name="l00093"></a>00093 <a class="code" href="struct_block_get_and_put.html#63d96a17e8118407e02896d0b0f8d92d">Block::Put</a>(xorBlock, outBlock)(a)(b)(c)(d);<a name="l00094"></a>00094 }<a name="l00095"></a>00095 <a name="l00096"></a>00096 NAMESPACE_END</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:23 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -