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124 lines
3.4 KiB
124 lines
3.4 KiB
4 years ago
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#include "pch.h"
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#include "gost.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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// these are the S-boxes given in Applied Cryptography 2nd Ed., p. 333
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const byte GOST::Base::sBox[8][16]={
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{4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3},
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{14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9},
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{5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11},
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{7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3},
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{6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2},
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{4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14},
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{13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12},
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{1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12}};
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/* // these are the S-boxes given in the GOST source code listing in Applied
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// Cryptography 2nd Ed., p. 644. they appear to be from the DES S-boxes
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{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 },
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{ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 },
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{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 },
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{ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 },
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{ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 },
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{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 },
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{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 },
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{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 }};
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*/
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volatile bool GOST::Base::sTableCalculated = false;
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word32 GOST::Base::sTable[4][256];
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void GOST::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &)
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{
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AssertValidKeyLength(length);
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PrecalculateSTable();
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GetUserKey(LITTLE_ENDIAN_ORDER, m_key.begin(), 8, userKey, KEYLENGTH);
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}
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void GOST::Base::PrecalculateSTable()
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{
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if (!sTableCalculated)
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{
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for (unsigned i = 0; i < 4; i++)
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for (unsigned j = 0; j < 256; j++)
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{
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word32 temp = sBox[2*i][j%16] | (sBox[2*i+1][j/16] << 4);
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sTable[i][j] = rotlMod(temp, 11+8*i);
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}
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sTableCalculated=true;
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}
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}
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#define f(x) ( t=x, \
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sTable[3][GETBYTE(t, 3)] ^ sTable[2][GETBYTE(t, 2)] \
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^ sTable[1][GETBYTE(t, 1)] ^ sTable[0][GETBYTE(t, 0)] )
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typedef BlockGetAndPut<word32, LittleEndian> Block;
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void GOST::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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word32 n1, n2, t;
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Block::Get(inBlock)(n1)(n2);
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for (unsigned int i=0; i<3; i++)
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{
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n2 ^= f(n1+m_key[0]);
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n1 ^= f(n2+m_key[1]);
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n2 ^= f(n1+m_key[2]);
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n1 ^= f(n2+m_key[3]);
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n2 ^= f(n1+m_key[4]);
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n1 ^= f(n2+m_key[5]);
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n2 ^= f(n1+m_key[6]);
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n1 ^= f(n2+m_key[7]);
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}
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n2 ^= f(n1+m_key[7]);
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n1 ^= f(n2+m_key[6]);
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n2 ^= f(n1+m_key[5]);
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n1 ^= f(n2+m_key[4]);
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n2 ^= f(n1+m_key[3]);
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n1 ^= f(n2+m_key[2]);
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n2 ^= f(n1+m_key[1]);
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n1 ^= f(n2+m_key[0]);
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Block::Put(xorBlock, outBlock)(n2)(n1);
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}
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void GOST::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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word32 n1, n2, t;
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Block::Get(inBlock)(n1)(n2);
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n2 ^= f(n1+m_key[0]);
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n1 ^= f(n2+m_key[1]);
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n2 ^= f(n1+m_key[2]);
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n1 ^= f(n2+m_key[3]);
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n2 ^= f(n1+m_key[4]);
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n1 ^= f(n2+m_key[5]);
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n2 ^= f(n1+m_key[6]);
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n1 ^= f(n2+m_key[7]);
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for (unsigned int i=0; i<3; i++)
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{
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n2 ^= f(n1+m_key[7]);
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n1 ^= f(n2+m_key[6]);
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n2 ^= f(n1+m_key[5]);
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n1 ^= f(n2+m_key[4]);
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n2 ^= f(n1+m_key[3]);
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n1 ^= f(n2+m_key[2]);
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n2 ^= f(n1+m_key[1]);
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n1 ^= f(n2+m_key[0]);
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}
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Block::Put(xorBlock, outBlock)(n2)(n1);
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}
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NAMESPACE_END
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