des.c

python的加密库

	 0x08000200,0x08000201,0x08040200,0x08040201,
	 0x09000200,0x09000201,0x09040200,0x09040201,
	 0x08000202,0x08000203,0x08040202,0x08040203,
	 0x09000202,0x09000203,0x09040202,0x09040203},
/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
	{0x00000000,0x00100000,0x00000100,0x00100100,
	 0x00000008,0x00100008,0x00000108,0x00100108,
	 0x00001000,0x00101000,0x00001100,0x00101100,
	 0x00001008,0x00101008,0x00001108,0x00101108,
	 0x04000000,0x04100000,0x04000100,0x04100100,
	 0x04000008,0x04100008,0x04000108,0x04100108,
	 0x04001000,0x04101000,0x04001100,0x04101100,
	 0x04001008,0x04101008,0x04001108,0x04101108,
	 0x00020000,0x00120000,0x00020100,0x00120100,
	 0x00020008,0x00120008,0x00020108,0x00120108,
	 0x00021000,0x00121000,0x00021100,0x00121100,
	 0x00021008,0x00121008,0x00021108,0x00121108,
	 0x04020000,0x04120000,0x04020100,0x04120100,
	 0x04020008,0x04120008,0x04020108,0x04120108,
	 0x04021000,0x04121000,0x04021100,0x04121100,
	 0x04021008,0x04121008,0x04021108,0x04121108},
/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
	{0x00000000,0x10000000,0x00010000,0x10010000,
	 0x00000004,0x10000004,0x00010004,0x10010004,
	 0x20000000,0x30000000,0x20010000,0x30010000,
	 0x20000004,0x30000004,0x20010004,0x30010004,
	 0x00100000,0x10100000,0x00110000,0x10110000,
	 0x00100004,0x10100004,0x00110004,0x10110004,
	 0x20100000,0x30100000,0x20110000,0x30110000,
	 0x20100004,0x30100004,0x20110004,0x30110004,
	 0x00001000,0x10001000,0x00011000,0x10011000,
	 0x00001004,0x10001004,0x00011004,0x10011004,
	 0x20001000,0x30001000,0x20011000,0x30011000,
	 0x20001004,0x30001004,0x20011004,0x30011004,
	 0x00101000,0x10101000,0x00111000,0x10111000,
	 0x00101004,0x10101004,0x00111004,0x10111004,
	 0x20101000,0x30101000,0x20111000,0x30111000,
	 0x20101004,0x30101004,0x20111004,0x30111004},
/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
	{0x00000000,0x08000000,0x00000008,0x08000008,
	 0x00000400,0x08000400,0x00000408,0x08000408,
	 0x00020000,0x08020000,0x00020008,0x08020008,
	 0x00020400,0x08020400,0x00020408,0x08020408,
	 0x00000001,0x08000001,0x00000009,0x08000009,
	 0x00000401,0x08000401,0x00000409,0x08000409,
	 0x00020001,0x08020001,0x00020009,0x08020009,
	 0x00020401,0x08020401,0x00020409,0x08020409,
	 0x02000000,0x0A000000,0x02000008,0x0A000008,
	 0x02000400,0x0A000400,0x02000408,0x0A000408,
	 0x02020000,0x0A020000,0x02020008,0x0A020008,
	 0x02020400,0x0A020400,0x02020408,0x0A020408,
	 0x02000001,0x0A000001,0x02000009,0x0A000009,
	 0x02000401,0x0A000401,0x02000409,0x0A000409,
	 0x02020001,0x0A020001,0x02020009,0x0A020009,
	 0x02020401,0x0A020401,0x02020409,0x0A020409},
/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
	{0x00000000,0x00000100,0x00080000,0x00080100,
	 0x01000000,0x01000100,0x01080000,0x01080100,
	 0x00000010,0x00000110,0x00080010,0x00080110,
	 0x01000010,0x01000110,0x01080010,0x01080110,
	 0x00200000,0x00200100,0x00280000,0x00280100,
	 0x01200000,0x01200100,0x01280000,0x01280100,
	 0x00200010,0x00200110,0x00280010,0x00280110,
	 0x01200010,0x01200110,0x01280010,0x01280110,
	 0x00000200,0x00000300,0x00080200,0x00080300,
	 0x01000200,0x01000300,0x01080200,0x01080300,
	 0x00000210,0x00000310,0x00080210,0x00080310,
	 0x01000210,0x01000310,0x01080210,0x01080310,
	 0x00200200,0x00200300,0x00280200,0x00280300,
	 0x01200200,0x01200300,0x01280200,0x01280300,
	 0x00200210,0x00200310,0x00280210,0x00280310,
	 0x01200210,0x01200310,0x01280210,0x01280310},
/* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
	{0x00000000,0x04000000,0x00040000,0x04040000,
	 0x00000002,0x04000002,0x00040002,0x04040002,
	 0x00002000,0x04002000,0x00042000,0x04042000,
	 0x00002002,0x04002002,0x00042002,0x04042002,
	 0x00000020,0x04000020,0x00040020,0x04040020,
	 0x00000022,0x04000022,0x00040022,0x04040022,
	 0x00002020,0x04002020,0x00042020,0x04042020,
	 0x00002022,0x04002022,0x00042022,0x04042022,
	 0x00000800,0x04000800,0x00040800,0x04040800,
	 0x00000802,0x04000802,0x00040802,0x04040802,
	 0x00002800,0x04002800,0x00042800,0x04042800,
	 0x00002802,0x04002802,0x00042802,0x04042802,
	 0x00000820,0x04000820,0x00040820,0x04040820,
	 0x00000822,0x04000822,0x00040822,0x04040822,
	 0x00002820,0x04002820,0x00042820,0x04042820,
	 0x00002822,0x04002822,0x00042822,0x04042822}
};

typedef struct des_ks_struct
{
	union	{
		des_cblock _;
		/* make sure things are correct size on machines with
		 * 8 byte longs */
		unsigned long pad[2];
	} ks;
#define _	ks._
} block_state[16];

static int des_encrypt(unsigned long *input, unsigned long *output,
                       block_state ks, int encrypt)
{
	unsigned long l,r,t,u;
	int i;
	unsigned long *s;

	l=input[0];
	r=input[1];

	/* do IP */
	PERM_OP(r,l,t, 4,0x0f0f0f0f);
	PERM_OP(l,r,t,16,0x0000ffff);
	PERM_OP(r,l,t, 2,0x33333333);
	PERM_OP(l,r,t, 8,0x00ff00ff);
	PERM_OP(r,l,t, 1,0x55555555);
	/* r and l are reversed - remember that :-) - fix
	 * it in the next step */

	/* Things have been modified so that the initial rotate is
	 * done outside the loop.  This required the
	 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
	 * One perl script later and things have a 5% speed up on a sparc2.
	 * Thanks to Richard Outerbridge <[e-mail]>
	 * for pointing this out. */
	t=(r<<1)|(r>>31);
	r=(l<<1)|(l>>31);
	l=t;

	/* clear the top bits on machines with 8byte longs */
	l&=0xffffffff;
	r&=0xffffffff;

	s=(unsigned long *)ks;
	/* I don't know if it is worth the effort of loop unrolling the
	 * inner loop */
	if (encrypt)
	{
		for (i=0; i<32; i+=4)
		{
			D_ENCRYPT(l,r,i+0); /*  1 */
			D_ENCRYPT(r,l,i+2); /*  2 */
		}
	}
	else
	{
		for (i=30; i>0; i-=4)
		{
			D_ENCRYPT(l,r,i-0); /* 16 */
			D_ENCRYPT(r,l,i-2); /* 15 */
		}
	}
	l=(l>>1)|(l<<31);
	r=(r>>1)|(r<<31);
	/* clear the top bits on machines with 8byte longs */
	l&=0xffffffff;
	r&=0xffffffff;

	/* swap l and r
	 * we will not do the swap so just remember they are
	 * reversed for the rest of the subroutine
	 * luckily FP fixes this problem :-) */

	PERM_OP(r,l,t, 1,0x55555555);
	PERM_OP(l,r,t, 8,0x00ff00ff);
	PERM_OP(r,l,t, 2,0x33333333);
	PERM_OP(l,r,t,16,0x0000ffff);
	PERM_OP(r,l,t, 4,0x0f0f0f0f);

	output[0]=l;
	output[1]=r;
	l=r=t=u=0;
	return(0);
}

static int des_ecb_encrypt(des_cblock *input, des_cblock *output,
                           block_state ks, int encrypt)
{
	register unsigned long l0,l1;
	register unsigned char *in,*out;
	unsigned long ll[2];

	in=(unsigned char *)input;
	out=(unsigned char *)output;
	c2l(in,l0);
	c2l(in,l1);
	ll[0]=l0;
	ll[1]=l1;
	des_encrypt(ll,ll,ks,encrypt);
	l0=ll[0];
	l1=ll[1];
	l2c(l0,out);
	l2c(l1,out);
	l0=l1=ll[0]=ll[1]=0;
	return(0);
}


     
static void block_decrypt(block_state *state, 
			  unsigned char *in, 
			  unsigned char *out)
{
	des_ecb_encrypt((des_cblock *)in, (des_cblock *)out, *state, 0);
}

static void block_encrypt(block_state *state, 
			  unsigned char *in, 
			  unsigned char *out)
{
	des_ecb_encrypt((des_cblock *)in, (des_cblock *)out, *state, 1);
}

/* NOW DEFINED IN des_local.h
 * See ecb_encrypt.c for a pseudo description of these macros. 
 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 * 	(b)^=(t),\
 * 	(a)=((a)^((t)<<(n))))
 */

#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
	(a)=(a)^(t)^(t>>(16-(n))))

static char shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};

/* return 0 if key parity is odd (correct),
 * return -1 if key parity error,
 * return -2 if illegal weak key.
 */
static int des_set_key(des_cblock *key, block_state schedule)
{
	register unsigned long c,d,t,s;
	register unsigned char *in;
	register unsigned long *k;
	register int i;

	k=(unsigned long *)schedule;
	in=(unsigned char *)key;

	c2l(in,c);
	c2l(in,d);

	/* do PC1 in 60 simple operations */ 
/*	PERM_OP(d,c,t,4,0x0f0f0f0f);
	HPERM_OP(c,t,-2, 0xcccc0000);
	HPERM_OP(c,t,-1, 0xaaaa0000);
	HPERM_OP(c,t, 8, 0x00ff0000);
	HPERM_OP(c,t,-1, 0xaaaa0000);
	HPERM_OP(d,t,-8, 0xff000000);
	HPERM_OP(d,t, 8, 0x00ff0000);
	HPERM_OP(d,t, 2, 0x33330000);
	d=((d&0x00aa00aa)<<7)|((d&0x55005500)>>7)|(d&0xaa55aa55);
	d=(d>>8)|((c&0xf0000000)>>4);
	c&=0x0fffffff; */

	/* I now do it in 47 simple operations :-)
	 * Thanks to John Fletcher ([e-mail])
	 * for the inspiration. :-) */
	PERM_OP (d,c,t,4,0x0f0f0f0f);
	HPERM_OP(c,t,-2,0xcccc0000);
	HPERM_OP(d,t,-2,0xcccc0000);
	PERM_OP (d,c,t,1,0x55555555);
	PERM_OP (c,d,t,8,0x00ff00ff);
	PERM_OP (d,c,t,1,0x55555555);
	d=	(((d&0x000000ff)<<16)| (d&0x0000ff00)     |
		 ((d&0x00ff0000)>>16)|((c&0xf0000000)>>4));
	c&=0x0fffffff;

	for (i=0; i<16; i++)
	{
		if (shifts2[i])
		{ c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26)); }
		else
		{ c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27)); }
		c&=0x0fffffff;
		d&=0x0fffffff;
		/* could be a few less shifts but I am to lazy at this
		 * point in time to investigate */
		s=	des_skb[0][ (c    )&0x3f                ]|
			des_skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)]|
			des_skb[2][((c>>13)&0x0f)|((c>>14)&0x30)]|
			des_skb[3][((c>>20)&0x01)|((c>>21)&0x06) |
				  ((c>>22)&0x38)];
		t=	des_skb[4][ (d    )&0x3f                ]|
			des_skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)]|
			des_skb[6][ (d>>15)&0x3f                ]|
			des_skb[7][((d>>21)&0x0f)|((d>>22)&0x30)];

		/* table contained 0213 4657 */
		*(k++)=((t<<16)|(s&0x0000ffff))&0xffffffff;
		s=     ((s>>16)|(t&0xffff0000));
		
		s=(s<<4)|(s>>28);
		*(k++)=s&0xffffffff;
	}
	return(0);
}

static const unsigned char odd_parity[256]={
	1,  1,  2,  2,  4,  4,  7,  7,  8,  8, 11, 11, 13, 13, 14, 14,
	16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
	32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
	49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
	64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
	81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
	97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
	112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
	128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
	145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
	161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
	176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
	193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
	208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
	224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
	241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254};

static void block_init(block_state *state, unsigned char *key,
		       int keylen)
{
	char oddkey[8];
	int i;
  
	for (i=0; i<8; i++)
	{
		oddkey[i]=odd_parity[ key[i] ];
	}
	des_set_key((des_cblock *)oddkey, *state);
}

#include "block_template.c"