des.cpp

实现DES的加密解密,有MFC界面,语言为C

// DES.cpp: implementation of the CDES class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include <string.h>
#include "DESTest.h"
#include "DES.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDES::CDES()
{
}

CDES::~CDES()
{
}

int CDES::encrypt (unsigned char key[8], unsigned char* data, int blocks)
{
    if ((!data) || (blocks<1))
	{
		return 0;
	}
	
	deskey (key, ENCRYPT);
    des(data, data, blocks);

	return 1;
}

int CDES::decrypt (unsigned char key[8], unsigned char* data, int blocks)
{
    if ((!data) || (blocks<1))
	{
		return 0;
	}
	
	deskey(key, DECRYPT);
    des(data, data, blocks);

	return 1;
}

int CDES::yencrypt(unsigned char key[8], unsigned char* data, int size)
{
    if ((!data) || (size<1))
	{
		return 0;
	}

    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 CDES::ydecrypt(unsigned char key[8], unsigned 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;
}

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

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

void CDES::des_block(unsigned char *in, unsigned char *out)
{
	unsigned long work[2];

	scrunch(in, work);
	desfunc(work, KnL);
	unscrun(work, out);
};

void CDES::deskey(unsigned char key[8], Mode md)
{
	register int ii, j, l, m, n;
	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 (ii = 0; ii < 16; ii++) 
	{
		if (md == DECRYPT) 
			m = (15 - ii) << 1;
		else 
			m = ii << 1;
		
		n = m + 1;
		kn[m] = kn[n] = 0L;

		for (j = 0; j < 28; j++) 
		{
			l = j + totrot[ii];

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

		for (j = 28; j < 56; j++) 
		{
			l = j + totrot[ii];
			
			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;
}

void CDES::cookey(register unsigned long *raw1)
{
	register unsigned long *cook, *raw0;
	unsigned long dough[32];
	register int i;

	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;
}

void CDES::usekey(register unsigned long *from)
{
    register unsigned long *to, *endp;

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

	while (to < endp) 
	{
		*to++ = *from++;
	}
	
	return;
}

void CDES::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 CDES::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 CDES::desfunc(register unsigned long *block, register unsigned long *keys)
{
	register unsigned long fval, work, right, leftt;
	register int round;

	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;
};

unsigned char CDES::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 CDES::bytebit[8] = 
{
0200, 0100, 040, 020, 010, 04, 02, 01 
};

unsigned long CDES::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 CDES::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 CDES::totrot[16] = 
{
1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 
};

unsigned char CDES::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 CDES::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 CDES::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 CDES::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 CDES::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 CDES::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 CDES::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 CDES::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 CDES::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 
};