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<h1>md2.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c</span>
<a name="l00002"></a>00002 <span class="comment">// The original code and all modifications are in the public domain.</span>
<a name="l00003"></a>00003
<a name="l00004"></a>00004 <span class="comment">// This is the original introductory comment:</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006 <span class="comment">/*</span>
<a name="l00007"></a>00007 <span class="comment"> * md2.c : MD2 hash algorithm.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * Part of the Python Cryptography Toolkit, version 1.1</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> * Distribute and use freely; there are no restrictions on further </span>
<a name="l00012"></a>00012 <span class="comment"> * dissemination and usage except those imposed by the laws of your </span>
<a name="l00013"></a>00013 <span class="comment"> * country of residence.</span>
<a name="l00014"></a>00014 <span class="comment"> *</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#include "pch.h"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#include "md2.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 NAMESPACE_BEGIN(CryptoPP)
<a name="l00022"></a>00022 namespace Weak1 {
<a name="l00023"></a>00023
<a name="l00024"></a>00024 MD2::MD2()
<a name="l00025"></a>00025 : m_X(48), m_C(16), m_buf(16)
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027 Init();
<a name="l00028"></a>00028 }
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keywordtype">void</span> MD2::Init()
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 memset(m_X, 0, 48);
<a name="l00033"></a>00033 memset(m_C, 0, 16);
<a name="l00034"></a>00034 memset(m_buf, 0, 16);
<a name="l00035"></a>00035 m_count = 0;
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037
<a name="l00038"></a><a class="code" href="class_weak1_1_1_m_d2.html#aaccb13508264bff36fd08553d41408c2">00038</a> <span class="keywordtype">void</span> MD2::Update(<span class="keyword">const</span> byte *buf, <span class="keywordtype">size_t</span> len)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 <span class="keyword">static</span> <span class="keyword">const</span> byte S[256] = {
<a name="l00041"></a>00041 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
<a name="l00042"></a>00042 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
<a name="l00043"></a>00043 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
<a name="l00044"></a>00044 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
<a name="l00045"></a>00045 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
<a name="l00046"></a>00046 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
<a name="l00047"></a>00047 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
<a name="l00048"></a>00048 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
<a name="l00049"></a>00049 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
<a name="l00050"></a>00050 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
<a name="l00051"></a>00051 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
<a name="l00052"></a>00052 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
<a name="l00053"></a>00053 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
<a name="l00054"></a>00054 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
<a name="l00055"></a>00055 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
<a name="l00056"></a>00056 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
<a name="l00057"></a>00057 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
<a name="l00058"></a>00058 31, 26, 219, 153, 141, 51, 159, 17, 131, 20
<a name="l00059"></a>00059 };
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordflow">while</span> (len)
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> L = UnsignedMin(16U-m_count, len);
<a name="l00064"></a>00064 memcpy(m_buf+m_count, buf, L);
<a name="l00065"></a>00065 m_count+=L;
<a name="l00066"></a>00066 buf+=L;
<a name="l00067"></a>00067 len-=L;
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (m_count==16)
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070 byte t;
<a name="l00071"></a>00071 <span class="keywordtype">int</span> i,j;
<a name="l00072"></a>00072
<a name="l00073"></a>00073 m_count=0;
<a name="l00074"></a>00074 memcpy(m_X+16, m_buf, 16);
<a name="l00075"></a>00075 t=m_C[15];
<a name="l00076"></a>00076 <span class="keywordflow">for</span>(i=0; i<16; i++)
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 m_X[32+i]=m_X[16+i]^m_X[i];
<a name="l00079"></a>00079 t=m_C[i]^=S[m_buf[i]^t];
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082 t=0;
<a name="l00083"></a>00083 <span class="keywordflow">for</span>(i=0; i<18; i++)
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085 <span class="keywordflow">for</span>(j=0; j<48; j+=8)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 t=m_X[j+0]^=S[t];
<a name="l00088"></a>00088 t=m_X[j+1]^=S[t];
<a name="l00089"></a>00089 t=m_X[j+2]^=S[t];
<a name="l00090"></a>00090 t=m_X[j+3]^=S[t];
<a name="l00091"></a>00091 t=m_X[j+4]^=S[t];
<a name="l00092"></a>00092 t=m_X[j+5]^=S[t];
<a name="l00093"></a>00093 t=m_X[j+6]^=S[t];
<a name="l00094"></a>00094 t=m_X[j+7]^=S[t];
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096 t=(t+i) & 0xFF;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a><a class="code" href="class_weak1_1_1_m_d2.html#abc251bec5e961a8c1a5e0c241f06dd41">00102</a> <span class="keywordtype">void</span> <a class="code" href="class_weak1_1_1_m_d2.html#abc251bec5e961a8c1a5e0c241f06dd41" title="truncated version of Final()">MD2::TruncatedFinal</a>(byte *hash, <span class="keywordtype">size_t</span> size)
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 ThrowIfInvalidTruncatedSize(size);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 byte padding[16];
<a name="l00107"></a>00107 word32 padlen;
<a name="l00108"></a>00108 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
<a name="l00109"></a>00109
<a name="l00110"></a>00110 padlen= 16-m_count;
<a name="l00111"></a>00111 <span class="keywordflow">for</span>(i=0; i<padlen; i++) padding[i]=(byte)padlen;
<a name="l00112"></a>00112 <a class="code" href="class_weak1_1_1_m_d2.html#aaccb13508264bff36fd08553d41408c2" title="process more input">Update</a>(padding, padlen);
<a name="l00113"></a>00113 <a class="code" href="class_weak1_1_1_m_d2.html#aaccb13508264bff36fd08553d41408c2" title="process more input">Update</a>(m_C, 16);
<a name="l00114"></a>00114 memcpy(hash, m_X, size);
<a name="l00115"></a>00115
<a name="l00116"></a>00116 Init();
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120 NAMESPACE_END
</pre></div></div>
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