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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: md5mac.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>md5mac.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// md5mac.cpp - modified by Wei Dai from Colin Plumb's public domain md5.c</span>00002 <span class="comment">// any modifications are placed in the public domain</span>00003 00004 <span class="preprocessor">#include "pch.h"</span>00005 <span class="preprocessor">#include "<a class="code" href="md5mac_8h.html">md5mac.h</a>"</span>00006 <span class="preprocessor">#include "misc.h"</span>00007 00008 NAMESPACE_BEGIN(CryptoPP)00009 00010 <span class="keyword">const</span> word32 MD5MAC_Base::T[12] =00011 { 0xac45ef97,0xcd430f29,0x551b7e45,0x3411801c,00012 0x96ce77b1,0x7c8e722e,0x0aab5a5f,0x18be4336,00013 0x21b4219d,0x4db987bc,0xbd279da2,0xc3d75bc7 };00014 00015 <span class="keywordtype">void</span> MD5MAC_Base::UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength)00016 {00017 <span class="keyword">const</span> word32 zeros[4] = {0,0,0,0};00018 00019 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0, j; i<3; i++)00020 {00021 m_key[4*i+0] = 0x67452301L;00022 m_key[4*i+1] = 0xefcdab89L;00023 m_key[4*i+2] = 0x98badcfeL;00024 m_key[4*i+3] = 0x10325476L;00025 00026 memcpy(m_data, userKey, KEYLENGTH);00027 CorrectEndianess(m_data, m_data, KEYLENGTH);00028 <span class="keywordflow">for</span> (j=0; j<3; j++)00029 memcpy(m_data+4+4*j, T+((i+j)%3)*4, 16);00030 Transform(m_key+4*i, m_data, zeros);00031 00032 <span class="keywordflow">for</span> (j=0; j<3; j++)00033 memcpy(m_data+4*j, T+((i+j)%3)*4, 16);00034 memcpy(m_data+12, userKey, KEYLENGTH);00035 CorrectEndianess(m_data+12, m_data+12, KEYLENGTH);00036 Transform(m_key+4*i, m_data, zeros);00037 }00038 00039 Init();00040 }00041 00042 <span class="keywordtype">void</span> MD5MAC_Base::Init()00043 {00044 m_digest[0] = m_key[0];00045 m_digest[1] = m_key[1];00046 m_digest[2] = m_key[2];00047 m_digest[3] = m_key[3];00048 }00049 <a name="l00050"></a><a class="code" href="class_m_d5_m_a_c___base.html#_m_d5_m_a_c___basea2">00050</a> <span class="keywordtype">void</span> <a class="code" href="class_m_d5_m_a_c___base.html#_m_d5_m_a_c___basea2">MD5MAC_Base::TruncatedFinal</a>(byte *hash, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)00051 {00052 ThrowIfInvalidTruncatedSize(size);00053 00054 PadLastBlock(56);00055 CorrectEndianess(m_data, m_data, 56);00056 00057 m_data[14] = GetBitCountLo();00058 m_data[15] = GetBitCountHi();00059 00060 Transform(m_digest, m_data, m_key+4);00061 00062 <span class="keywordtype">unsigned</span> i;00063 <span class="keywordflow">for</span> (i=0; i<4; i++)00064 m_data[i] = m_key[8+i];00065 <span class="keywordflow">for</span> (i=0; i<12; i++)00066 m_data[i+4] = T[i] ^ m_key[8+i%4];00067 Transform(m_digest, m_data, m_key+4);00068 00069 CorrectEndianess(m_digest, m_digest, DIGESTSIZE);00070 memcpy(hash, m_digest, size);00071 00072 <a class="code" href="class_hash_transformation.html#_x_m_a_c_ca8">Restart</a>(); <span class="comment">// reinit for next use</span>00073 }00074 00075 <span class="keywordtype">void</span> MD5MAC_Base::Transform(word32 *digest, <span class="keyword">const</span> word32 *in, <span class="keyword">const</span> word32 *key)00076 {00077 <span class="preprocessor">#define F1(x, y, z) ((z ^ (x & (y ^ z))) + key[0])</span>00078 <span class="preprocessor"></span><span class="preprocessor">#define F2(x, y, z) ((y ^ (z & (x ^ y))) + key[1])</span>00079 <span class="preprocessor"></span><span class="preprocessor">#define F3(x, y, z) ((x ^ y ^ z) + key[2])</span>00080 <span class="preprocessor"></span><span class="preprocessor">#define F4(x, y, z) ((y ^ (x | ~z)) + key[3])</span>00081 <span class="preprocessor"></span>00082 <span class="preprocessor">#define MD5STEP(f, w, x, y, z, data, s) \</span>00083 <span class="preprocessor"> w = rotlFixed(w + f(x, y, z) + data, s) + x</span>00084 <span class="preprocessor"></span>00085 word32 a, b, c, d;00086 00087 a=digest[0];00088 b=digest[1];00089 c=digest[2];00090 d=digest[3];00091 00092 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);00093 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);00094 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);00095 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);00096 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);00097 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);00098 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);00099 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);00100 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);00101 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);00102 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);00103 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);00104 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);00105 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);00106 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);00107 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);00108 00109 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);00110 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);00111 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);00112 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);00113 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);00114 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);00115 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);00116 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);00117 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);00118 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);00119 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);00120 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);00121 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);00122 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);00123 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);00124 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);00125 00126 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);00127 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);00128 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);00129 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);00130 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);00131 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);00132 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);00133 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);00134 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);00135 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);00136 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);00137 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);00138 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);00139 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);00140 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);00141 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);00142 00143 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);00144 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);00145 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);00146 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);00147 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);00148 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);00149 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);00150 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);00151 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);00152 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);00153 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);00154 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);00155 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);00156 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);00157 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);00158 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);00159 00160 digest[0]+=a;00161 digest[1]+=b;00162 digest[2]+=c;00163 digest[3]+=d;00164 }00165 00166 NAMESPACE_END</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:19 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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