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<h1>serpent.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// serpent.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 <span class="preprocessor">#include "<a class="code" href="serpent_8h.html">serpent.h</a>"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include "misc.h"</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <span class="preprocessor">#include "serpentp.h"</span>
<a name="l00008"></a>00008
<a name="l00009"></a>00009 NAMESPACE_BEGIN(CryptoPP)
<a name="l00010"></a>00010
<a name="l00011"></a>00011 void Serpent_KeySchedule(word32 *k, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rounds, const byte *userKey, <span class="keywordtype">size_t</span> keylen)
<a name="l00012"></a>00012 {
<a name="l00013"></a>00013 <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<word32, 8></a> k0;
<a name="l00014"></a>00014 GetUserKey(LITTLE_ENDIAN_ORDER, k0.begin(), 8, userKey, keylen);
<a name="l00015"></a>00015 <span class="keywordflow">if</span> (keylen < 32)
<a name="l00016"></a>00016 k0[keylen/4] |= word32(1) << ((keylen%4)*8);
<a name="l00017"></a>00017
<a name="l00018"></a>00018 word32 t = k0[7];
<a name="l00019"></a>00019 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
<a name="l00020"></a>00020 <span class="keywordflow">for</span> (i = 0; i < 8; ++i)
<a name="l00021"></a>00021 k[i] = k0[i] = t = rotlFixed(k0[i] ^ k0[(i+3)%8] ^ k0[(i+5)%8] ^ t ^ 0x9e3779b9 ^ i, 11);
<a name="l00022"></a>00022 <span class="keywordflow">for</span> (i = 8; i < 4*(rounds+1); ++i)
<a name="l00023"></a>00023 k[i] = t = rotlFixed(k[i-8] ^ k[i-5] ^ k[i-3] ^ t ^ 0x9e3779b9 ^ i, 11);
<a name="l00024"></a>00024 k -= 20;
<a name="l00025"></a>00025
<a name="l00026"></a>00026 word32 a,b,c,d,e;
<a name="l00027"></a>00027 <span class="keywordflow">for</span> (i=0; i<rounds/8; i++)
<a name="l00028"></a>00028 {
<a name="l00029"></a>00029 afterS2(LK); afterS2(S3); afterS3(SK);
<a name="l00030"></a>00030 afterS1(LK); afterS1(S2); afterS2(SK);
<a name="l00031"></a>00031 afterS0(LK); afterS0(S1); afterS1(SK);
<a name="l00032"></a>00032 beforeS0(LK); beforeS0(S0); afterS0(SK);
<a name="l00033"></a>00033 k += 8*4;
<a name="l00034"></a>00034 afterS6(LK); afterS6(S7); afterS7(SK);
<a name="l00035"></a>00035 afterS5(LK); afterS5(S6); afterS6(SK);
<a name="l00036"></a>00036 afterS4(LK); afterS4(S5); afterS5(SK);
<a name="l00037"></a>00037 afterS3(LK); afterS3(S4); afterS4(SK);
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039 afterS2(LK); afterS2(S3); afterS3(SK);
<a name="l00040"></a>00040 }
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keywordtype">void</span> Serpent::Base::UncheckedSetKey(<span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &)
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 AssertValidKeyLength(keylen);
<a name="l00045"></a>00045 Serpent_KeySchedule(m_key, 32, userKey, keylen);
<a name="l00046"></a>00046 }
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, LittleEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordtype">void</span> Serpent::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="l00051"></a>00051 <span class="keyword"></span>{
<a name="l00052"></a>00052 word32 a, b, c, d, e;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 Block::Get(inBlock)(a)(b)(c)(d);
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keyword">const</span> word32 *k = m_key;
<a name="l00057"></a>00057 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=1;
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="keywordflow">do</span>
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061 beforeS0(KX); beforeS0(S0); afterS0(LT);
<a name="l00062"></a>00062 afterS0(KX); afterS0(S1); afterS1(LT);
<a name="l00063"></a>00063 afterS1(KX); afterS1(S2); afterS2(LT);
<a name="l00064"></a>00064 afterS2(KX); afterS2(S3); afterS3(LT);
<a name="l00065"></a>00065 afterS3(KX); afterS3(S4); afterS4(LT);
<a name="l00066"></a>00066 afterS4(KX); afterS4(S5); afterS5(LT);
<a name="l00067"></a>00067 afterS5(KX); afterS5(S6); afterS6(LT);
<a name="l00068"></a>00068 afterS6(KX); afterS6(S7);
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordflow">if</span> (i == 4)
<a name="l00071"></a>00071 <span class="keywordflow">break</span>;
<a name="l00072"></a>00072
<a name="l00073"></a>00073 ++i;
<a name="l00074"></a>00074 c = b;
<a name="l00075"></a>00075 b = e;
<a name="l00076"></a>00076 e = d;
<a name="l00077"></a>00077 d = a;
<a name="l00078"></a>00078 a = e;
<a name="l00079"></a>00079 k += 32;
<a name="l00080"></a>00080 beforeS0(LT);
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 <span class="keywordflow">while</span> (<span class="keyword">true</span>);
<a name="l00083"></a>00083
<a name="l00084"></a>00084 afterS7(KX);
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(d)(e)(b)(a);
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="keywordtype">void</span> Serpent::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="l00090"></a>00090 <span class="keyword"></span>{
<a name="l00091"></a>00091 word32 a, b, c, d, e;
<a name="l00092"></a>00092
<a name="l00093"></a>00093 Block::Get(inBlock)(a)(b)(c)(d);
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keyword">const</span> word32 *k = m_key + 96;
<a name="l00096"></a>00096 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=4;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 beforeI7(KX);
<a name="l00099"></a>00099 <span class="keywordflow">goto</span> start;
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="keywordflow">do</span>
<a name="l00102"></a>00102 {
<a name="l00103"></a>00103 c = b;
<a name="l00104"></a>00104 b = d;
<a name="l00105"></a>00105 d = e;
<a name="l00106"></a>00106 k -= 32;
<a name="l00107"></a>00107 beforeI7(ILT);
<a name="l00108"></a>00108 start:
<a name="l00109"></a>00109 beforeI7(I7); afterI7(KX);
<a name="l00110"></a>00110 afterI7(ILT); afterI7(I6); afterI6(KX);
<a name="l00111"></a>00111 afterI6(ILT); afterI6(I5); afterI5(KX);
<a name="l00112"></a>00112 afterI5(ILT); afterI5(I4); afterI4(KX);
<a name="l00113"></a>00113 afterI4(ILT); afterI4(I3); afterI3(KX);
<a name="l00114"></a>00114 afterI3(ILT); afterI3(I2); afterI2(KX);
<a name="l00115"></a>00115 afterI2(ILT); afterI2(I1); afterI1(KX);
<a name="l00116"></a>00116 afterI1(ILT); afterI1(I0); afterI0(KX);
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 <span class="keywordflow">while</span> (--i != 0);
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <a class="code" href="class_put_block.html">Block::Put</a>(xorBlock, outBlock)(a)(d)(b)(e);
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122
<a name="l00123"></a>00123 NAMESPACE_END
</pre></div></div>
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