DES算法,CPP文件

#include <mem.h>

#include "des.h"

int DES::encrypt ( char key[8], char* data, int blocks )

{

if ((!data)||(blocks<1))

return 0;

deskey ( key, ENCRYPT );

des ( data, data, blocks);

return 1;

};

int DES::decrypt ( char key[8], char* data, int blocks )

{

if ((!data)||(blocks<1))

return 0;

deskey ( key, DECRYPT );

des ( data, data, blocks);

return 1;

};

int DES::yencrypt ( char key[8], char* data, int size )

{

if ((!data)||(size<1))

return 0;

// The last char of data is bitwise complemented and filled the rest

// buffer.If size is 16, it will extend to 24,and 17 still 24.

char lastChar = *(data+size-1);

int blocks = size/8+1;

memset (data+size, ~lastChar, blocks*8-size);

deskey ( key, ENCRYPT );

return encrypt ( data, data, blocks);

};

int DES::ydecrypt ( char key[8], char* data, int blocks, int* size )

{

if ( (!data) || (blocks<1) )

return 0;

deskey ( key, DECRYPT );

if ( !decrypt ( data, data, blocks) )

return 0;

if ( size != 0 )

{

int pos = blocks*8-1;

char endChar = data[pos];

while ((pos>0)&&(data[pos]==endChar))

pos--;

if ( data[pos] != ~endChar )

return 0;

*size = pos+1;

}

return 1;

};

// -----------------------------------------------------------------------

// des

// Encrpts/Decrypts(according to the key currently loaded int the

// internal key register) SOME blocks of eight bytes at address 'in'

// into the block at address 'out'. They can be the same.

// "in"

// "out"

// "block" Number of blocks.

// -----------------------------------------------------------------------

void DES::des ( unsigned char* in, unsigned char* out, int blocks )

{

for (int i = 0; i < blocks; i++,in+=8,out+=8)

des_block(in,out);

};

// -----------------------------------------------------------------------

// des_block

// Encrpts/Decrypts(according to the key currently loaded int the

// internal key register) one block of eight bytes at address 'in'

// into the block at address 'out'. They can be the same.

// "in"

// "out"

// -----------------------------------------------------------------------

void DES::des_block(unsigned char *in, unsigned char *out)

{

unsigned long work[2];

scrunch(in, work);

desfunc(work, KnL);

unscrun(work, out);

}

// ----------------------------------------------------------------------

// deskey

// Sets the internal key register (KnR) according to the hexadecimal

// key contained in the 8 bytes of hexkey, according to the DES,

// for encryption or decrytion according to MODE

// "key" is the 64 bits key.

// "md" means encryption or decryption.

// ----------------------------------------------------------------------

void DES::deskey(unsigned char key[8], Mode md) /* Thanks to James Gillogly & Phil Karn! */

{

unsigned char pc1m[56], pcr[56];

unsigned long kn[32];

for (j = 0; j < 56; j++) {

l = pc1[j];

m = l & 07;

pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1:0;

}

for (i = 0; i < 16; i++) {

if (md == DECRYPT) m = (15 - i) << 1;

else m = i << 1;

n = m + 1;

kn[m] = kn[n] = 0L;

for (j = 0; j < 28; j++) {

l = j + totrot[i];

if (l < 28) pcr[j] = pc1m[l];

else pcr[j] = pc1m[l - 28];

}

for (j = 28; j < 56; j++) {

l = j + totrot[i];

if (l < 56) pcr[j] = pc1m[l];

else pcr[j] = pc1m[l - 28];

}

for (j = 0; j < 24; j++) {

if (pcr[ pc2[j] ]) kn[m] |= bigbyte[j];

if (pcr[ pc2[j+24] ]) kn[n] |= bigbyte[j];

}

cookey(kn);

return;

}

// ----------------------------------------------------------------------

// cookey

// Only called by deskey.

// -----------------------------------------------------------------------

void DES::cookey(register unsigned long *raw1)

{

unsigned long dough[32];

cook = dough;

for (i = 0; i < 16; i++, raw1++) {

raw0 = raw1++;

*cook = (*raw0 & 0x00fc0000L) << 6;

*cook |= (*raw0 & 0x00000fc0L) << 10;

*cook |= (*raw1 & 0x00fc0000L) >> 10;

*cook++ |= (*raw1 & 0x00000fc0L) >> 6;

*cook = (*raw0 & 0x0003f000L) << 12;

*cook |= (*raw0 & 0x0000003fL) << 16;

*cook |= (*raw1 & 0x0003f000L) >> 4;

*cook++ |= (*raw1 & 0x0000003fL);

}

usekey(dough);

return;

}

// ----------------------------------------------------------------------

// usekey

// Only called by cookey.

// Loads the interal key register with the data in cookedkey.

// -----------------------------------------------------------------------

void DES::usekey(register unsigned long *from)

{

to = KnL, endp = &KnL[32];

while (to < endp) *to++ = *from++;

return;

}

void DES::scrunch(register unsigned char *outof, register unsigned long *into )

{

*into = (*outof++ & 0xffL) << 24;

*into |= (*outof++ & 0xffL) << 16;

*into |= (*outof++ & 0xffL) << 8;

*into++ |= (*outof++ & 0xffL);

*into = (*outof++ & 0xffL) << 24;

*into |= (*outof++ & 0xffL) << 16;

*into |= (*outof++ & 0xffL) << 8;

*into |= (*outof & 0xffL);

return;

}

void DES::unscrun(register unsigned long *outof, register unsigned char *into)

{

*into++ = (*outof >> 24) & 0xffL;

*into++ = (*outof >> 16) & 0xffL;

*into++ = (*outof >> 8) & 0xffL;

*into++ = *outof++ & 0xffL;

*into++ = (*outof >> 24) & 0xffL;

*into++ = (*outof >> 16) & 0xffL;

*into++ = (*outof >> 8) & 0xffL;

*into = *outof & 0xffL;

return;

}

void DES::desfunc(register unsigned long *block,register unsigned long *keys)

{

leftt = block[0];

right = block[1];

work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;

right ^= work;

leftt ^= (work << 4);

work = ((leftt >> 16) ^ right) & 0x0000ffffL;

right ^= work;

leftt ^= (work << 16);

work = ((right >> 2) ^ leftt) & 0x33333333L;

leftt ^= work;

right ^= (work << 2);

work = ((right >> 8) ^ leftt) & 0x00ff00ffL;

leftt ^= work;

right ^= (work << 8);

right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;

work = (leftt ^ right) & 0xaaaaaaaaL;

leftt ^= work;

right ^= work;

leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;

for (round = 0; round < 8; round++) {

work = (right << 28) | (right >> 4);

work ^= *keys++;

fval = SP7[work & 0x3fL];

fval |= SP5[(work >> 8) & 0x3fL];

fval |= SP3[(work >> 16) & 0x3fL];

fval |= SP1[(work >> 24) & 0x3fL];

work = right ^ *keys++;

fval |= SP8[work & 0x3fL];

fval |= SP6[(work >> 8) & 0x3fL];

fval |= SP4[(work >> 16) & 0x3fL];

fval |= SP2[(work >> 24) & 0x3fL];

leftt ^= fval;

work = (leftt << 28) | (leftt >> 4);

work ^= *keys++;

fval = SP7[work & 0x3fL];

fval |= SP5[(work >> 8) & 0x3fL];

fval |= SP3[(work >> 16) & 0x3fL];

fval |= SP1[(work >> 24) & 0x3fL];

work = leftt ^ *keys++;

fval |= SP8[work & 0x3fL];

fval |= SP6[(work >> 8) & 0x3fL];

fval |= SP4[(work >> 16) & 0x3fL];

fval |= SP2[(work >> 24) & 0x3fL];

right ^= fval;

}

right = (right << 31) | (right >> 1);

work = (leftt ^ right) & 0xaaaaaaaaL;

leftt ^= work;

right ^= work;

leftt = (leftt << 31) | ( leftt >> 1);

work = ((leftt >> 8) ^ right) & 0x00ff00ffL;

right ^= work;

leftt ^= (work << 8);

work = ((leftt >> 2) ^ right) & 0x33333333L;

right ^= work;

leftt ^= (work << 2);

work = ((right >> 16) ^ leftt) & 0x0000ffffL;

leftt ^= work;

right ^= (work << 16);

work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;

leftt ^= work;

right ^= (work << 4);

*block++ = right;

*block = leftt;

return;

}

// -----------------------------------------------------------------------

// Initial of static data members. These data will be used by all the

// instances of class,and can not be changed.

// -----------------------------------------------------------------------

unsigned char DES::Df_Key[24] = {

0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,

0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,

0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67 };

unsigned short DES::bytebit[8] = {

0200, 0100, 040, 020, 010, 04, 02, 01 };

unsigned long DES::bigbyte[24] = {

0x800000L, 0x400000L, 0x200000L, 0x100000L,

0x80000L, 0x40000L, 0x20000L, 0x10000L,

0x8000L, 0x4000L, 0x2000L, 0x1000L,

0x800L, 0x400L, 0x200L, 0x100L,

0x80L, 0x40L, 0x20L, 0x10L,

0x8L, 0x4L, 0x2L, 0x1L };

unsigned char DES::pc1[56] = {

56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,

9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,

62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,

13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 };

unsigned char DES::totrot[16] = {

1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 };

unsigned char DES::pc2[48] = {

13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,

22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,

40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,

43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };

unsigned long DES::SP1[64] = {

0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,

0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,

0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,

0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,

0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,

0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,

0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,

0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,

0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,

0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,

0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,

0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,

0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,

0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,

0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,

0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L };

unsigned long DES::SP2[64] = {

0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,

0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,

0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,

0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,

0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,

0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,

0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,

0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,

0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,

0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,

0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,

0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,

0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,

0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,

0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,

0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L };

unsigned long DES::SP3[64] = {

0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,

0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,

0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,

0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,

0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,

0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,

0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,

0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,

0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,

0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,

0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,

0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,

0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,

0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,

0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,

0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L };

unsigned long DES::SP4[64] = {

0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,

0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,

0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,

0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,

0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,

0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,

0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,

0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,

0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,

0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,

0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,

0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,

0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,

0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,

0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,

0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L };

unsigned long DES::SP5[64] = {

0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,

0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,

0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,

0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,

0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,

0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,

0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,

0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,

0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,

0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,

0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,

0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,

0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,

0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,

0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,

0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L };

unsigned long DES::SP6[64] = {

0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,

0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,

0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,

0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,

0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,

0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,

0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,

0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,

0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,

0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,

0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,

0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,

0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,

0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,

0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,

0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L };

unsigned long DES::SP7[64] = {

0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,

0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,

0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,

0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,

0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,

0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,

0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,

0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,

0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,

0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,

0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,

0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,

0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,

0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,

0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,

0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };

unsigned long DES::SP8[64] = {

0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,

0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,

0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,

0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,

0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,

0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,

0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,

0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,

0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,

0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,

0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,

0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,

0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,

0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,

0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,

0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };

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