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<h1>blowfish.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// blowfish.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="blowfish_8h.html">blowfish.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 NAMESPACE_BEGIN(CryptoPP)
<a name="l00008"></a>00008
<a name="l00009"></a>00009 void <a class="code" href="class_blowfish.html" title="Blowfish">Blowfish</a>::Base::UncheckedSetKey(const byte *key_string, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylength, const <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &)
<a name="l00010"></a>00010 {
<a name="l00011"></a>00011 AssertValidKeyLength(keylength);
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="keywordtype">unsigned</span> i, j=0, k;
<a name="l00014"></a>00014 word32 data, dspace[2] = {0, 0};
<a name="l00015"></a>00015
<a name="l00016"></a>00016 memcpy(pbox, p_init, <span class="keyword">sizeof</span>(p_init));
<a name="l00017"></a>00017 memcpy(sbox, s_init, <span class="keyword">sizeof</span>(s_init));
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">// Xor key string into encryption key vector</span>
<a name="l00020"></a>00020 <span class="keywordflow">for</span> (i=0 ; i<ROUNDS+2 ; ++i)
<a name="l00021"></a>00021 {
<a name="l00022"></a>00022 data = 0 ;
<a name="l00023"></a>00023 <span class="keywordflow">for</span> (k=0 ; k<4 ; ++k )
<a name="l00024"></a>00024 data = (data << 8) | key_string[j++ % keylength];
<a name="l00025"></a>00025 pbox[i] ^= data;
<a name="l00026"></a>00026 }
<a name="l00027"></a>00027
<a name="l00028"></a>00028 crypt_block(dspace, pbox);
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="keywordflow">for</span> (i=0; i<ROUNDS; i+=2)
<a name="l00031"></a>00031 crypt_block(pbox+i, pbox+i+2);
<a name="l00032"></a>00032
<a name="l00033"></a>00033 crypt_block(pbox+ROUNDS, sbox);
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="keywordflow">for</span> (i=0; i<4*256-2; i+=2)
<a name="l00036"></a>00036 crypt_block(sbox+i, sbox+i+2);
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keywordflow">if</span> (!IsForwardTransformation())
<a name="l00039"></a>00039 <span class="keywordflow">for</span> (i=0; i<(ROUNDS+2)/2; i++)
<a name="l00040"></a>00040 std::swap(pbox[i], pbox[ROUNDS+1-i]);
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">// this version is only used to make pbox and sbox</span>
<a name="l00044"></a>00044 <span class="keywordtype">void</span> Blowfish::Base::crypt_block(<span class="keyword">const</span> word32 in[2], word32 out[2])<span class="keyword"> const</span>
<a name="l00045"></a>00045 <span class="keyword"></span>{
<a name="l00046"></a>00046 word32 left = in[0];
<a name="l00047"></a>00047 word32 right = in[1];
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keyword">const</span> word32 *<span class="keyword">const</span> s=sbox;
<a name="l00050"></a>00050 <span class="keyword">const</span> word32 *p=pbox;
<a name="l00051"></a>00051
<a name="l00052"></a>00052 left ^= p[0];
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i<ROUNDS/2; i++)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
<a name="l00057"></a>00057 ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
<a name="l00058"></a>00058 ^ p[2*i+1];
<a name="l00059"></a>00059
<a name="l00060"></a>00060 left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
<a name="l00061"></a>00061 ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
<a name="l00062"></a>00062 ^ p[2*i+2];
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 right ^= p[ROUNDS+1];
<a name="l00066"></a>00066
<a name="l00067"></a>00067 out[0] = right;
<a name="l00068"></a>00068 out[1] = left;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordtype">void</span> Blowfish::Base::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
<a name="l00072"></a>00072 <span class="keyword"></span>{
<a name="l00073"></a>00073 <span class="keyword">typedef</span> <a class="code" href="struct_block_get_and_put.html">BlockGetAndPut<word32, BigEndian></a> <a class="code" href="struct_block_get_and_put.html">Block</a>;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 word32 left, right;
<a name="l00076"></a>00076 <a class="code" href="class_buffered_transformation.html#a9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Block::Get</a>(inBlock)(left)(right);
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="keyword">const</span> word32 *<span class="keyword">const</span> s=sbox;
<a name="l00079"></a>00079 <span class="keyword">const</span> word32 *p=pbox;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 left ^= p[0];
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i<ROUNDS/2; i++)
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085 right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
<a name="l00086"></a>00086 ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
<a name="l00087"></a>00087 ^ p[2*i+1];
<a name="l00088"></a>00088
<a name="l00089"></a>00089 left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
<a name="l00090"></a>00090 ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
<a name="l00091"></a>00091 ^ p[2*i+2];
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093
<a name="l00094"></a>00094 right ^= p[ROUNDS+1];
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <a class="code" href="class_buffered_transformation.html#ae70658b0d271f8e114ac6c3cc9774ede" title="input a byte for processing">Block::Put</a>(xorBlock, outBlock)(right)(left);
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098
<a name="l00099"></a>00099 NAMESPACE_END
</pre></div></div>
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