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<h1>shacal2.cpp</h1><pre class="fragment"><div>00001 <span class="comment">// shacal2.cpp - by Kevin Springle, 2003</span>
00002 <span class="comment">//</span>
00003 <span class="comment">// Portions of this code were derived from</span>
00004 <span class="comment">// Wei Dai's implementation of SHA-2</span>
00005 <span class="comment">//</span>
00006 <span class="comment">// The original code and all modifications are in the public domain.</span>
00007
00008 <span class="preprocessor">#include "pch.h"</span>
00009 <span class="preprocessor">#include "<a class="code" href="shacal2_8h.html">shacal2.h</a>"</span>
00010 <span class="preprocessor">#include "misc.h"</span>
00011
00012 NAMESPACE_BEGIN(CryptoPP)
00013
00014 <span class="comment">// SHACAL-2 function and round definitions</span>
00015
00016 #define S0(x) (rotrFixed(x,2)^rotrFixed(x,13)^rotrFixed(x,22))
00017 <span class="preprocessor">#define S1(x) (rotrFixed(x,6)^rotrFixed(x,11)^rotrFixed(x,25))</span>
00018 <span class="preprocessor"></span><span class="preprocessor">#define s0(x) (rotrFixed(x,7)^rotrFixed(x,18)^(x>>3))</span>
00019 <span class="preprocessor"></span><span class="preprocessor">#define s1(x) (rotrFixed(x,17)^rotrFixed(x,19)^(x>>10))</span>
00020 <span class="preprocessor"></span>
00021 <span class="preprocessor">#define Ch(x,y,z) (z^(x&(y^z)))</span>
00022 <span class="preprocessor"></span><span class="preprocessor">#define Maj(x,y,z) ((x&y)|(z&(x|y)))</span>
00023 <span class="preprocessor"></span>
00024 <span class="comment">/* R is the SHA-256 round function. */</span>
00025 <span class="comment">/* This macro increments the k argument as a side effect. */</span>
00026 <span class="preprocessor">#define R(a,b,c,d,e,f,g,h,k) \</span>
00027 <span class="preprocessor"> h+=S1(e)+Ch(e,f,g)+*k++;d+=h;h+=S0(a)+Maj(a,b,c);</span>
00028 <span class="preprocessor"></span>
00029 <span class="comment">/* P is the inverse of the SHA-256 round function. */</span>
00030 <span class="comment">/* This macro decrements the k argument as a side effect. */</span>
00031 <span class="preprocessor">#define P(a,b,c,d,e,f,g,h,k) \</span>
00032 <span class="preprocessor"> h-=S0(a)+Maj(a,b,c);d-=h;h-=S1(e)+Ch(e,f,g)+*--k;</span>
00033 <span class="preprocessor"></span>
00034 <span class="keywordtype">void</span> SHACAL2::Base::UncheckedSetKey(CipherDir dir, <span class="keyword">const</span> byte *userKey, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> keylen)
00035 {
00036 AssertValidKeyLength(keylen);
00037
00038 word32 *rk = m_key;
00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
00040
00041 GetUserKey(BIG_ENDIAN_ORDER, rk, m_key.size(), userKey, keylen);
00042 <span class="keywordflow">for</span> (i = 0; i < 48; i++, rk++)
00043 {
00044 rk[16] = rk[0] + s0(rk[1]) + rk[9] + s1(rk[14]);
00045 rk[0] += K[i];
00046 }
00047 <span class="keywordflow">for</span> (i = 48; i < 64; i++, rk++)
00048 {
00049 rk[0] += K[i];
00050 }
00051 }
00052
00053 <span class="keyword">typedef</span> BlockGetAndPut<word32, BigEndian> Block;
00054
00055 <span class="keywordtype">void</span> SHACAL2::Enc::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
00056 <span class="keyword"></span>{
00057 word32 a, b, c, d, e, f, g, h;
00058 <span class="keyword">const</span> word32 *rk = m_key;
00059
00060 <span class="comment">/*</span>
00061 <span class="comment"> * map byte array block to cipher state:</span>
00062 <span class="comment"> */</span>
00063 Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h);
00064
00065 <span class="comment">// Perform SHA-256 transformation.</span>
00066
00067 <span class="comment">/* 64 operations, partially loop unrolled */</span>
00068 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<64; j+=8)
00069 {
00070 R(a,b,c,d,e,f,g,h,rk);
00071 R(h,a,b,c,d,e,f,g,rk);
00072 R(g,h,a,b,c,d,e,f,rk);
00073 R(f,g,h,a,b,c,d,e,rk);
00074 R(e,f,g,h,a,b,c,d,rk);
00075 R(d,e,f,g,h,a,b,c,rk);
00076 R(c,d,e,f,g,h,a,b,rk);
00077 R(b,c,d,e,f,g,h,a,rk);
00078 }
00079
00080 <span class="comment">/*</span>
00081 <span class="comment"> * map cipher state to byte array block:</span>
00082 <span class="comment"> */</span>
00083
00084 Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h);
00085 }
00086
00087 <span class="keywordtype">void</span> SHACAL2::Dec::ProcessAndXorBlock(<span class="keyword">const</span> byte *inBlock, <span class="keyword">const</span> byte *xorBlock, byte *outBlock)<span class="keyword"> const</span>
00088 <span class="keyword"></span>{
00089 word32 a, b, c, d, e, f, g, h;
00090 <span class="keyword">const</span> word32 *rk = m_key + 64;
00091
00092 <span class="comment">/*</span>
00093 <span class="comment"> * map byte array block to cipher state:</span>
00094 <span class="comment"> */</span>
00095 Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h);
00096
00097 <span class="comment">// Perform inverse SHA-256 transformation.</span>
00098
00099 <span class="comment">/* 64 operations, partially loop unrolled */</span>
00100 <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> j=0; j<64; j+=8)
00101 {
00102 P(b,c,d,e,f,g,h,a,rk);
00103 P(c,d,e,f,g,h,a,b,rk);
00104 P(d,e,f,g,h,a,b,c,rk);
00105 P(e,f,g,h,a,b,c,d,rk);
00106 P(f,g,h,a,b,c,d,e,rk);
00107 P(g,h,a,b,c,d,e,f,rk);
00108 P(h,a,b,c,d,e,f,g,rk);
00109 P(a,b,c,d,e,f,g,h,rk);
00110 }
00111
00112 <span class="comment">/*</span>
00113 <span class="comment"> * map cipher state to byte array block:</span>
00114 <span class="comment"> */</span>
00115
00116 Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h);
00117 }
00118
00119 <span class="comment">// The SHACAL-2 round constants are identical to the SHA-256 round constants.</span>
00120 <span class="keyword">const</span> word32 SHACAL2::Base::K[64] =
00121 {
00122 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
00123 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
00124 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
00125 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
00126 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
00127 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
00128 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
00129 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
00130 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
00131 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
00132 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
00133 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
00134 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
00135 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
00136 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
00137 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
00138 };
00139
00140 NAMESPACE_END
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:59 2004 for Crypto++ by
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