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<h1>gost.cpp</h1><pre class="fragment"><div>00001 <span class="preprocessor">#include "pch.h"</span>
00002 <span class="preprocessor">#include "<a class="code" href="gost_8h.html">gost.h</a>"</span>
00003 <span class="preprocessor">#include "misc.h"</span>
00004
00005 NAMESPACE_BEGIN(CryptoPP)
00006
00007 <span class="comment">// these are the S-boxes given in Applied Cryptography 2nd Ed., p. 333</span>
00008 const byte <a class="code" href="class_g_o_s_t.html">GOST</a>::Base::sBox[8][16]={
00009 {4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3},
00010 {14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9},
00011 {5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11},
00012 {7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3},
00013 {6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2},
00014 {4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14},
00015 {13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12},
00016 {1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12}};
00017
00018 <span class="comment">/* // these are the S-boxes given in the GOST source code listing in Applied</span>
00019 <span class="comment"> // Cryptography 2nd Ed., p. 644. they appear to be from the DES S-boxes</span>
00020 <span class="comment"> {13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },</span>
00021 <span class="comment"> { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },</span>
00022 <span class="comment"> {12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },</span>
00023 <span class="comment"> { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },</span>
00024 <span class="comment"> { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },</span>
00025 <span class="comment"> {10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },</span>
00026 <span class="comment"> {15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },</span>
00027 <span class="comment"> {14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 }}; </span>
00028 <span class="comment">*/</span>
00029
00030 <span class="keywordtype">bool</span> GOST::Base::sTableCalculated = <span class="keyword">false</span>;
00031 word32 GOST::Base::sTable[4][256];
00032
00033 <span class="keywordtype">void</span> GOST::Base::UncheckedSetKey(CipherDir direction, <span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)
00034 {
00035 AssertValidKeyLength(length);
00036
00037 PrecalculateSTable();
00038
00039 GetUserKey(LITTLE_ENDIAN_ORDER, key.begin(), 8, userKey, KEYLENGTH);
00040 }
00041
00042 <span class="keywordtype">void</span> GOST::Base::PrecalculateSTable()
00043 {
00044 <span class="keywordflow">if</span> (!sTableCalculated)
00045 {
00046 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i < 4; i++)
00047 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> j = 0; j < 256; j++)
00048 {
00049 word32 temp = sBox[2*i][j%16] | (sBox[2*i+1][j/16] << 4);
00050 sTable[i][j] = rotlMod(temp, 11+8*i);
00051 }
00052
00053 sTableCalculated=<span class="keyword">true</span>;
00054 }
00055 }
00056
00057 <span class="preprocessor">#define f(x) ( t=x, \</span>
00058 <span class="preprocessor"> sTable[3][GETBYTE(t, 3)] ^ sTable[2][GETBYTE(t, 2)] \</span>
00059 <span class="preprocessor"> ^ sTable[1][GETBYTE(t, 1)] ^ sTable[0][GETBYTE(t, 0)] )</span>
00060 <span class="preprocessor"></span>
00061 <span class="keyword">typedef</span> BlockGetAndPut<word32, LittleEndian> Block;
00062
00063 <span class="keywordtype">void</span> GOST::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
00064 <span class="keyword"></span>{
00065 word32 n1, n2, t;
00066
00067 Block::Get(inBlock)(n1)(n2);
00068
00069 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<3; i++)
00070 {
00071 n2 ^= f(n1+key[0]);
00072 n1 ^= f(n2+key[1]);
00073 n2 ^= f(n1+key[2]);
00074 n1 ^= f(n2+key[3]);
00075 n2 ^= f(n1+key[4]);
00076 n1 ^= f(n2+key[5]);
00077 n2 ^= f(n1+key[6]);
00078 n1 ^= f(n2+key[7]);
00079 }
00080
00081 n2 ^= f(n1+key[7]);
00082 n1 ^= f(n2+key[6]);
00083 n2 ^= f(n1+key[5]);
00084 n1 ^= f(n2+key[4]);
00085 n2 ^= f(n1+key[3]);
00086 n1 ^= f(n2+key[2]);
00087 n2 ^= f(n1+key[1]);
00088 n1 ^= f(n2+key[0]);
00089
00090 Block::Put(xorBlock, outBlock)(n2)(n1);
00091 }
00092
00093 <span class="keywordtype">void</span> GOST::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
00094 <span class="keyword"></span>{
00095 word32 n1, n2, t;
00096
00097 Block::Get(inBlock)(n1)(n2);
00098
00099 n2 ^= f(n1+key[0]);
00100 n1 ^= f(n2+key[1]);
00101 n2 ^= f(n1+key[2]);
00102 n1 ^= f(n2+key[3]);
00103 n2 ^= f(n1+key[4]);
00104 n1 ^= f(n2+key[5]);
00105 n2 ^= f(n1+key[6]);
00106 n1 ^= f(n2+key[7]);
00107
00108 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<3; i++)
00109 {
00110 n2 ^= f(n1+key[7]);
00111 n1 ^= f(n2+key[6]);
00112 n2 ^= f(n1+key[5]);
00113 n1 ^= f(n2+key[4]);
00114 n2 ^= f(n1+key[3]);
00115 n1 ^= f(n2+key[2]);
00116 n2 ^= f(n1+key[1]);
00117 n1 ^= f(n2+key[0]);
00118 }
00119
00120 Block::Put(xorBlock, outBlock)(n2)(n1);
00121 }
00122
00123 NAMESPACE_END
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:57 2004 for Crypto++ by
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