des.c

外国开源的硬盘加密软件

0x00020008,0x08000008,0x08000008,0x00020000, 0x08020208,0x00020008,0x08020000,0x00000208,
0x08000000,0x00000008,0x08020200,0x00000200, 0x00020200,0x08020000,0x08020008,0x00020208,
0x08000208,0x00020200,0x00020000,0x08000208, 0x00000008,0x08020208,0x00000200,0x08000000,
0x08020200,0x08000000,0x00020008,0x00000208, 0x00020000,0x08020200,0x08000200,0x00000000,
0x00000200,0x00020008,0x08020208,0x08000200, 0x08000008,0x00000200,0x00000000,0x08020008,
0x08000208,0x00020000,0x08000000,0x08020208, 0x00000008,0x00020208,0x00020200,0x08000008,
0x08020000,0x08000208,0x00000208,0x08020000, 0x00020208,0x00000008,0x08020008,0x00020200},
{
0x00802001,0x00002081,0x00002081,0x00000080, 0x00802080,0x00800081,0x00800001,0x00002001,
0x00000000,0x00802000,0x00802000,0x00802081, 0x00000081,0x00000000,0x00800080,0x00800001,
0x00000001,0x00002000,0x00800000,0x00802001, 0x00000080,0x00800000,0x00002001,0x00002080,
0x00800081,0x00000001,0x00002080,0x00800080, 0x00002000,0x00802080,0x00802081,0x00000081,
0x00800080,0x00800001,0x00802000,0x00802081, 0x00000081,0x00000000,0x00000000,0x00802000,
0x00002080,0x00800080,0x00800081,0x00000001, 0x00802001,0x00002081,0x00002081,0x00000080,
0x00802081,0x00000081,0x00000001,0x00002000, 0x00800001,0x00002001,0x00802080,0x00800081,
0x00002001,0x00002080,0x00800000,0x00802001, 0x00000080,0x00800000,0x00002000,0x00802080},
{
0x00000100,0x02080100,0x02080000,0x42000100, 0x00080000,0x00000100,0x40000000,0x02080000,
0x40080100,0x00080000,0x02000100,0x40080100, 0x42000100,0x42080000,0x00080100,0x40000000,
0x02000000,0x40080000,0x40080000,0x00000000, 0x40000100,0x42080100,0x42080100,0x02000100,
0x42080000,0x40000100,0x00000000,0x42000000, 0x02080100,0x02000000,0x42000000,0x00080100,
0x00080000,0x42000100,0x00000100,0x02000000, 0x40000000,0x02080000,0x42000100,0x40080100,
0x02000100,0x40000000,0x42080000,0x02080100, 0x40080100,0x00000100,0x02000000,0x42080000,
0x42080100,0x00080100,0x42000000,0x42080100, 0x02080000,0x00000000,0x40080000,0x42000000,
0x00080100,0x02000100,0x40000100,0x00080000, 0x00000000,0x40080000,0x02080100,0x40000100},
{
0x20000010,0x20400000,0x00004000,0x20404010, 0x20400000,0x00000010,0x20404010,0x00400000,
0x20004000,0x00404010,0x00400000,0x20000010, 0x00400010,0x20004000,0x20000000,0x00004010,
0x00000000,0x00400010,0x20004010,0x00004000, 0x00404000,0x20004010,0x00000010,0x20400010,
0x20400010,0x00000000,0x00404010,0x20404000, 0x00004010,0x00404000,0x20404000,0x20000000,
0x20004000,0x00000010,0x20400010,0x00404000, 0x20404010,0x00400000,0x00004010,0x20000010,
0x00400000,0x20004000,0x20000000,0x00004010, 0x20000010,0x20404010,0x00404000,0x20400000,
0x00404010,0x20404000,0x00000000,0x20400010, 0x00000010,0x00004000,0x20400000,0x00404010,
0x00004000,0x00400010,0x20004010,0x00000000, 0x20404000,0x20000000,0x00400010,0x20004010},
{
0x00200000,0x04200002,0x04000802,0x00000000, 0x00000800,0x04000802,0x00200802,0x04200800,
0x04200802,0x00200000,0x00000000,0x04000002, 0x00000002,0x04000000,0x04200002,0x00000802,
0x04000800,0x00200802,0x00200002,0x04000800, 0x04000002,0x04200000,0x04200800,0x00200002,
0x04200000,0x00000800,0x00000802,0x04200802, 0x00200800,0x00000002,0x04000000,0x00200800,
0x04000000,0x00200800,0x00200000,0x04000802, 0x04000802,0x04200002,0x04200002,0x00000002,
0x00200002,0x04000000,0x04000800,0x00200000, 0x04200800,0x00000802,0x00200802,0x04200800,
0x00000802,0x04000002,0x04200802,0x04200000, 0x00200800,0x00000000,0x00000002,0x04200802,
0x00000000,0x00200802,0x04200000,0x00000800, 0x04000002,0x04000800,0x00000800,0x00200002},
{
0x10001040,0x00001000,0x00040000,0x10041040, 0x10000000,0x10001040,0x00000040,0x10000000,
0x00040040,0x10040000,0x10041040,0x00041000, 0x10041000,0x00041040,0x00001000,0x00000040,
0x10040000,0x10000040,0x10001000,0x00001040, 0x00041000,0x00040040,0x10040040,0x10041000,
0x00001040,0x00000000,0x00000000,0x10040040, 0x10000040,0x10001000,0x00041040,0x00040000,
0x00041040,0x00040000,0x10041000,0x00001000, 0x00000040,0x10040040,0x00001000,0x00041040,
0x10001000,0x00000040,0x10000040,0x10040000, 0x10040040,0x10000000,0x00040000,0x10001040,
0x00000000,0x10041040,0x00040040,0x10000040, 0x10040000,0x10001000,0x10001040,0x00000000,
0x10041040,0x00041000,0x00041000,0x00001040, 0x00001040,0x00040040,0x10000000,0x10041000}
};

/* Set key (initialize key schedule array) */
static void RawSetKey (int encryption, const byte *key, word32 *scheduledKey)
{
	byte buffer[56+56+8];
	byte *const pc1m=buffer;                 /* place to modify pc1 into */
	byte *const pcr=pc1m+56;                 /* place to rotate pc1 into */
	byte *const ks=pcr+56;
	register int i,j,l;
	int m;
	
	for (j=0; j<56; j++) {          /* convert pc1 to bits of key */
		l=pc1[j]-1;             /* integer bit location  */
		m = l & 07;             /* find bit              */
		pc1m[j]=(key[l>>3] &    /* find which key byte l is in */
			bytebit[m])     /* and which bit of that byte */
			? 1 : 0;        /* and store 1-bit result */
	}
	for (i=0; i<16; i++) {          /* key chunk for each iteration */
		memset(ks,0,8);         /* Clear key schedule */
		for (j=0; j<56; j++)    /* rotate pc1 the right amount */
			pcr[j] = pc1m[(l=j+totrot[i])<(j<28? 28 : 56) ? l: l-28];
		/* rotate left and right halves independently */
		for (j=0; j<48; j++){   /* select bits individually */
			/* check bit that goes to ks[j] */
			if (pcr[pc2[j]-1]){
				/* mask it in if it's there */
				l= j % 6;
				ks[j/6] |= bytebit[l] >> 2;
			}
		}
		/* Now convert to odd/even interleaved form for use in F */
		scheduledKey[2*i] = ((word32)ks[0] << 24)
			| ((word32)ks[2] << 16)
			| ((word32)ks[4] << 8)
			| ((word32)ks[6]);
		scheduledKey[2*i+1] = ((word32)ks[1] << 24)
			| ((word32)ks[3] << 16)
			| ((word32)ks[5] << 8)
			| ((word32)ks[7]);
	}
	
	if (!encryption)     // reverse key schedule order
		for (i=0; i<16; i+=2)
		{
			word32 b = scheduledKey[i];
			scheduledKey[i] = scheduledKey[32-2-i];
			scheduledKey[32-2-i] = b;

			b = scheduledKey[i+1];
			scheduledKey[i+1] = scheduledKey[32-1-i];
			scheduledKey[32-1-i] = b;
		}

	burn (buffer, sizeof (buffer));
}

static void RawProcessBlock(word32 *l_, word32 *r_, const word32 *k)
{
	word32 l = *l_, r = *r_;
	const word32 *kptr=k;
	unsigned i;

	for (i=0; i<8; i++)
	{
		word32 work = rotrFixed(r, 4U) ^ kptr[4*i+0];
		l ^= Spbox[6][(work) & 0x3f]
		  ^  Spbox[4][(work >> 8) & 0x3f]
		  ^  Spbox[2][(work >> 16) & 0x3f]
		  ^  Spbox[0][(work >> 24) & 0x3f];
		work = r ^ kptr[4*i+1];
		l ^= Spbox[7][(work) & 0x3f]
		  ^  Spbox[5][(work >> 8) & 0x3f]
		  ^  Spbox[3][(work >> 16) & 0x3f]
		  ^  Spbox[1][(work >> 24) & 0x3f];

		work = rotrFixed(l, 4U) ^ kptr[4*i+2];
		r ^= Spbox[6][(work) & 0x3f]
		  ^  Spbox[4][(work >> 8) & 0x3f]
		  ^  Spbox[2][(work >> 16) & 0x3f]
		  ^  Spbox[0][(work >> 24) & 0x3f];
		work = l ^ kptr[4*i+3];
		r ^= Spbox[7][(work) & 0x3f]
		  ^  Spbox[5][(work >> 8) & 0x3f]
		  ^  Spbox[3][(work >> 16) & 0x3f]
		  ^  Spbox[1][(work >> 24) & 0x3f];
	}

	*l_ = l; *r_ = r;
}

void TripleDesSetKey (const byte *userKey, unsigned int length, TDES_KEY *ks)
{
	RawSetKey (1, userKey + 0, ks->k1);
	RawSetKey (1, userKey + 8, ks->k2);
	RawSetKey (1, userKey + 16, ks->k3);
	RawSetKey (0, userKey + 16, ks->k1d);
	RawSetKey (0, userKey + 8, ks->k2d);
	RawSetKey (0, userKey + 0, ks->k3d);
}

void TripleDesEncrypt (byte *inBlock, byte *outBlock, TDES_KEY *key, int encrypt)
{
	word32 left = BE32 (((word32 *)inBlock)[0]);
	word32 right = BE32 (((word32 *)inBlock)[1]);
	word32 work;

	right = rotlFixed(right, 4U);
	work = (left ^ right) & 0xf0f0f0f0;
	left ^= work;
	right = rotrFixed(right^work, 20U);
	work = (left ^ right) & 0xffff0000;
	left ^= work;
	right = rotrFixed(right^work, 18U);
	work = (left ^ right) & 0x33333333;
	left ^= work;
	right = rotrFixed(right^work, 6U);
	work = (left ^ right) & 0x00ff00ff;
	left ^= work;
	right = rotlFixed(right^work, 9U);
	work = (left ^ right) & 0xaaaaaaaa;
	left = rotlFixed(left^work, 1U);
	right ^= work;

	RawProcessBlock (&left, &right, encrypt ? key->k1 : key->k1d);
	RawProcessBlock (&right, &left, !encrypt ? key->k2 : key->k2d);
	RawProcessBlock (&left, &right, encrypt ? key->k3 : key->k3d);
	
	right = rotrFixed(right, 1U);
	work = (left ^ right) & 0xaaaaaaaa;
	right ^= work;
	left = rotrFixed(left^work, 9U);
	work = (left ^ right) & 0x00ff00ff;
	right ^= work;
	left = rotlFixed(left^work, 6U);
	work = (left ^ right) & 0x33333333;
	right ^= work;
	left = rotlFixed(left^work, 18U);
	work = (left ^ right) & 0xffff0000;
	right ^= work;
	left = rotlFixed(left^work, 20U);
	work = (left ^ right) & 0xf0f0f0f0;
	right ^= work;
	left = rotrFixed(left^work, 4U);

	((word32 *)outBlock)[0] = BE32 (right);
	((word32 *)outBlock)[1] = BE32 (left);
}