You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
4.2 KiB
137 lines
4.2 KiB
![]()
4 years ago
|
// shark.cpp - written and placed in the public domain by Wei Dai
|
||
|
|
||
|
#include "pch.h"
|
||
|
#include "shark.h"
|
||
|
#include "misc.h"
|
||
|
#include "modes.h"
|
||
|
#include "gf256.h"
|
||
|
|
||
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
||
|
static word64 SHARKTransform(word64 a)
|
||
|
{
|
||
|
static const byte iG[8][8] = {
|
||
|
0xe7, 0x30, 0x90, 0x85, 0xd0, 0x4b, 0x91, 0x41,
|
||
|
0x53, 0x95, 0x9b, 0xa5, 0x96, 0xbc, 0xa1, 0x68,
|
||
|
0x02, 0x45, 0xf7, 0x65, 0x5c, 0x1f, 0xb6, 0x52,
|
||
|
0xa2, 0xca, 0x22, 0x94, 0x44, 0x63, 0x2a, 0xa2,
|
||
|
0xfc, 0x67, 0x8e, 0x10, 0x29, 0x75, 0x85, 0x71,
|
||
|
0x24, 0x45, 0xa2, 0xcf, 0x2f, 0x22, 0xc1, 0x0e,
|
||
|
0xa1, 0xf1, 0x71, 0x40, 0x91, 0x27, 0x18, 0xa5,
|
||
|
0x56, 0xf4, 0xaf, 0x32, 0xd2, 0xa4, 0xdc, 0x71,
|
||
|
};
|
||
|
|
||
|
word64 result=0;
|
||
|
GF256 gf256(0xf5);
|
||
|
for (unsigned int i=0; i<8; i++)
|
||
|
for(unsigned int j=0; j<8; j++)
|
||
|
result ^= word64(gf256.Multiply(iG[i][j], GF256::Element(a>>(56-8*j)))) << (56-8*i);
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
void SHARK::Base::UncheckedSetKey(const byte *key, unsigned int keyLen, const NameValuePairs ¶ms)
|
||
|
{
|
||
|
AssertValidKeyLength(keyLen);
|
||
|
|
||
|
m_rounds = GetRoundsAndThrowIfInvalid(params, this);
|
||
|
m_roundKeys.New(m_rounds+1);
|
||
|
|
||
|
// concatenate key enought times to fill a
|
||
|
for (unsigned int i=0; i<(m_rounds+1)*8; i++)
|
||
|
((byte *)m_roundKeys.begin())[i] = key[i%keyLen];
|
||
|
|
||
|
SHARK::Encryption e;
|
||
|
e.InitForKeySetup();
|
||
|
byte IV[8] = {0,0,0,0,0,0,0,0};
|
||
|
CFB_Mode_ExternalCipher::Encryption cfb(e, IV);
|
||
|
|
||
|
cfb.ProcessString((byte *)m_roundKeys.begin(), (m_rounds+1)*8);
|
||
|
|
||
|
ConditionalByteReverse(BIG_ENDIAN_ORDER, m_roundKeys.begin(), m_roundKeys.begin(), (m_rounds+1)*8);
|
||
|
|
||
|
m_roundKeys[m_rounds] = SHARKTransform(m_roundKeys[m_rounds]);
|
||
|
|
||
|
if (!IsForwardTransformation())
|
||
|
{
|
||
|
unsigned int i;
|
||
|
|
||
|
// transform encryption round keys into decryption round keys
|
||
|
for (i=0; i<m_rounds/2; i++)
|
||
|
std::swap(m_roundKeys[i], m_roundKeys[m_rounds-i]);
|
||
|
|
||
|
for (i=1; i<m_rounds; i++)
|
||
|
m_roundKeys[i] = SHARKTransform(m_roundKeys[i]);
|
||
|
}
|
||
|
|
||
|
#ifdef IS_LITTLE_ENDIAN
|
||
|
m_roundKeys[0] = ByteReverse(m_roundKeys[0]);
|
||
|
m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
// construct an SHARK_Enc object with fixed round keys, to be used to initialize actual round keys
|
||
|
void SHARK::Enc::InitForKeySetup()
|
||
|
{
|
||
|
m_rounds = DEFAULT_ROUNDS;
|
||
|
m_roundKeys.New(DEFAULT_ROUNDS+1);
|
||
|
|
||
|
for (unsigned int i=0; i<DEFAULT_ROUNDS; i++)
|
||
|
m_roundKeys[i] = cbox[0][i];
|
||
|
|
||
|
m_roundKeys[DEFAULT_ROUNDS] = SHARKTransform(cbox[0][DEFAULT_ROUNDS]);
|
||
|
|
||
|
#ifdef IS_LITTLE_ENDIAN
|
||
|
m_roundKeys[0] = ByteReverse(m_roundKeys[0]);
|
||
|
m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
typedef word64 ArrayOf256Word64s[256];
|
||
|
|
||
|
template <const byte *sbox, const ArrayOf256Word64s *cbox>
|
||
|
struct SharkProcessAndXorBlock{ // VC60 workaround: problem with template functions
|
||
|
inline SharkProcessAndXorBlock(const word64 *roundKeys, unsigned int rounds, const byte *inBlock, const byte *xorBlock, byte *outBlock)
|
||
|
{
|
||
|
word64 tmp = *(word64 *)inBlock ^ roundKeys[0];
|
||
|
|
||
|
ByteOrder order = GetNativeByteOrder();
|
||
|
tmp = cbox[0][GetByte(order, tmp, 0)] ^ cbox[1][GetByte(order, tmp, 1)]
|
||
|
^ cbox[2][GetByte(order, tmp, 2)] ^ cbox[3][GetByte(order, tmp, 3)]
|
||
|
^ cbox[4][GetByte(order, tmp, 4)] ^ cbox[5][GetByte(order, tmp, 5)]
|
||
|
^ cbox[6][GetByte(order, tmp, 6)] ^ cbox[7][GetByte(order, tmp, 7)]
|
||
|
^ roundKeys[1];
|
||
|
|
||
|
for(unsigned int i=2; i<rounds; i++)
|
||
|
{
|
||
|
tmp = cbox[0][GETBYTE(tmp, 7)] ^ cbox[1][GETBYTE(tmp, 6)]
|
||
|
^ cbox[2][GETBYTE(tmp, 5)] ^ cbox[3][GETBYTE(tmp, 4)]
|
||
|
^ cbox[4][GETBYTE(tmp, 3)] ^ cbox[5][GETBYTE(tmp, 2)]
|
||
|
^ cbox[6][GETBYTE(tmp, 1)] ^ cbox[7][GETBYTE(tmp, 0)]
|
||
|
^ roundKeys[i];
|
||
|
}
|
||
|
|
||
|
PutBlock<byte, BigEndian>(xorBlock, outBlock)
|
||
|
(sbox[GETBYTE(tmp, 7)])
|
||
|
(sbox[GETBYTE(tmp, 6)])
|
||
|
(sbox[GETBYTE(tmp, 5)])
|
||
|
(sbox[GETBYTE(tmp, 4)])
|
||
|
(sbox[GETBYTE(tmp, 3)])
|
||
|
(sbox[GETBYTE(tmp, 2)])
|
||
|
(sbox[GETBYTE(tmp, 1)])
|
||
|
(sbox[GETBYTE(tmp, 0)]);
|
||
|
|
||
|
*(word64 *)outBlock ^= roundKeys[rounds];
|
||
|
}};
|
||
|
|
||
|
void SHARK::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
||
|
{
|
||
|
SharkProcessAndXorBlock<sbox, cbox>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);
|
||
|
}
|
||
|
|
||
|
void SHARK::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
||
|
{
|
||
|
SharkProcessAndXorBlock<sbox, cbox>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);
|
||
|
}
|
||
|
|
||
|
NAMESPACE_END
|