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141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
// shacal2.cpp - by Kevin Springle, 2003
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//
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// Portions of this code were derived from
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// Wei Dai's implementation of SHA-2
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//
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// The original code and all modifications are in the public domain.
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#include "pch.h"
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#include "shacal2.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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// SHACAL-2 function and round definitions
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#define S0(x) (rotrFixed(x,2)^rotrFixed(x,13)^rotrFixed(x,22))
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#define S1(x) (rotrFixed(x,6)^rotrFixed(x,11)^rotrFixed(x,25))
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#define s0(x) (rotrFixed(x,7)^rotrFixed(x,18)^(x>>3))
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#define s1(x) (rotrFixed(x,17)^rotrFixed(x,19)^(x>>10))
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#define Ch(x,y,z) (z^(x&(y^z)))
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#define Maj(x,y,z) ((x&y)|(z&(x|y)))
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/* R is the SHA-256 round function. */
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/* This macro increments the k argument as a side effect. */
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#define R(a,b,c,d,e,f,g,h,k) \
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h+=S1(e)+Ch(e,f,g)+*k++;d+=h;h+=S0(a)+Maj(a,b,c);
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/* P is the inverse of the SHA-256 round function. */
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/* This macro decrements the k argument as a side effect. */
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#define P(a,b,c,d,e,f,g,h,k) \
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h-=S0(a)+Maj(a,b,c);d-=h;h-=S1(e)+Ch(e,f,g)+*--k;
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void SHACAL2::Base::UncheckedSetKey(CipherDir dir, const byte *userKey, unsigned int keylen)
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{
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AssertValidKeyLength(keylen);
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word32 *rk = m_key;
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unsigned int i;
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GetUserKey(BIG_ENDIAN_ORDER, rk, m_key.size(), userKey, keylen);
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for (i = 0; i < 48; i++, rk++)
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{
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rk[16] = rk[0] + s0(rk[1]) + rk[9] + s1(rk[14]);
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rk[0] += K[i];
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}
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for (i = 48; i < 64; i++, rk++)
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{
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rk[0] += K[i];
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}
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}
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typedef BlockGetAndPut<word32, BigEndian> Block;
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void SHACAL2::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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word32 a, b, c, d, e, f, g, h;
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const word32 *rk = m_key;
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/*
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* map byte array block to cipher state:
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*/
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Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h);
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// Perform SHA-256 transformation.
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/* 64 operations, partially loop unrolled */
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for (unsigned int j=0; j<64; j+=8)
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{
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R(a,b,c,d,e,f,g,h,rk);
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R(h,a,b,c,d,e,f,g,rk);
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R(g,h,a,b,c,d,e,f,rk);
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R(f,g,h,a,b,c,d,e,rk);
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R(e,f,g,h,a,b,c,d,rk);
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R(d,e,f,g,h,a,b,c,rk);
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R(c,d,e,f,g,h,a,b,rk);
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R(b,c,d,e,f,g,h,a,rk);
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}
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/*
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* map cipher state to byte array block:
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*/
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Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h);
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}
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void SHACAL2::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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word32 a, b, c, d, e, f, g, h;
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const word32 *rk = m_key + 64;
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/*
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* map byte array block to cipher state:
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*/
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Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h);
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// Perform inverse SHA-256 transformation.
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/* 64 operations, partially loop unrolled */
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for (unsigned int j=0; j<64; j+=8)
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{
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P(b,c,d,e,f,g,h,a,rk);
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P(c,d,e,f,g,h,a,b,rk);
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P(d,e,f,g,h,a,b,c,rk);
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P(e,f,g,h,a,b,c,d,rk);
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P(f,g,h,a,b,c,d,e,rk);
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P(g,h,a,b,c,d,e,f,rk);
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P(h,a,b,c,d,e,f,g,rk);
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P(a,b,c,d,e,f,g,h,rk);
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}
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/*
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* map cipher state to byte array block:
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*/
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Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h);
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}
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// The SHACAL-2 round constants are identical to the SHA-256 round constants.
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const word32 SHACAL2::Base::K[64] =
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{
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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NAMESPACE_END
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