crypt_des.c File Reference

#include "windef.h"
#include "crypt.h"

Include dependency graph for crypt_des.c:

Go to the source code of this file.

Macros
#define	CLRBIT(STR, IDX)   ( (STR)[(IDX)/8] &= ~(0x01 << (7 - ((IDX)%8))) )
#define	SETBIT(STR, IDX)   ( (STR)[(IDX)/8] |= (0x01 << (7 - ((IDX)%8))) )
#define	GETBIT(STR, IDX)   (( ((STR)[(IDX)/8]) >> (7 - ((IDX)%8)) ) & 0x01)

Functions
static void	Permute (unsigned char *dst, const unsigned char *src, const unsigned char *map, const int mapsize)
static void	KeyShiftLeft (unsigned char *key, const int numbits)
static void	KeyShiftRight (unsigned char *key, const int numbits)
static void	sbox (unsigned char *dst, const unsigned char *src)
static void	xor (unsigned char *dst, const unsigned char *a, const unsigned char *b, const int count)
unsigned char *	CRYPT_DEShash (unsigned char *dst, const unsigned char *key, const unsigned char *src)
unsigned char *	CRYPT_DESunhash (unsigned char *dst, const unsigned char *key, const unsigned char *src)

Variables
static const unsigned char	InitialPermuteMap [64]
static const unsigned char	KeyPermuteMap [56]
static const unsigned char	KeyRotation [16]
static const unsigned char	KeyCompression [48]
static const unsigned char	DataExpansion [48]
static const unsigned char	SBox [8][64]
static const unsigned char	PBox [32]
static const unsigned char	FinalPermuteMap [64]

Macro Definition Documentation

CLRBIT

#define CLRBIT	(		STR,
			IDX
	)		( (STR)[(IDX)/8] &= ~(0x01 << (7 - ((IDX)%8))) )

Definition at line 149 of file crypt_des.c.

GETBIT

#define GETBIT	(		STR,
			IDX
	)		(( ((STR)[(IDX)/8]) >> (7 - ((IDX)%8)) ) & 0x01)

Definition at line 151 of file crypt_des.c.

SETBIT

#define SETBIT	(		STR,
			IDX
	)		( (STR)[(IDX)/8] |= (0x01 << (7 - ((IDX)%8))) )

Definition at line 150 of file crypt_des.c.

Function Documentation

CRYPT_DEShash()

unsigned char * CRYPT_DEShash	(	unsigned char *	dst,
		const unsigned char *	key,
		const unsigned char *	src
	)

Definition at line 259 of file crypt_des.c.

{
    int i;
    unsigned char K[7];
    unsigned char D[8];
 
    Permute( K, key, KeyPermuteMap, 7 );
    Permute( D, src, InitialPermuteMap, 8 );
 
    for (i = 0; i < 16; i++)
    {
        int j;
        unsigned char *L = D;
        unsigned char *R = &(D[4]);
        unsigned char  Rexp[6];
        unsigned char  Rn[4];
        unsigned char  SubK[6];
 
        KeyShiftLeft( K, KeyRotation[i] );
        Permute( SubK, K, KeyCompression, 6 );
 
        Permute( Rexp, R, DataExpansion, 6 );
        xor( Rexp, Rexp, SubK, 6 );
 
        sbox( Rn, Rexp );
        Permute( Rexp, Rn, PBox, 4 );
        xor( Rn, L, Rexp, 4 );
 
        for (j = 0; j < 4; j++)
        {
            L[j] = R[j];
            R[j] = Rn[j];
        }
    }
 
    Permute( dst, D, FinalPermuteMap, 8 );
 
    return dst;
}

Referenced by CRYPT_LMhash(), SystemFunction001(), SystemFunction003(), SystemFunction004(), SystemFunction008(), SystemFunction012(), and SystemFunction024().

CRYPT_DESunhash()

unsigned char * CRYPT_DESunhash	(	unsigned char *	dst,
		const unsigned char *	key,
		const unsigned char *	src
	)

Definition at line 299 of file crypt_des.c.

{
    int i;
    unsigned char K[7];
    unsigned char D[8];
 
    Permute( K, key, KeyPermuteMap, 7 );
    Permute( D, src, InitialPermuteMap, 8 );
 
    for (i = 0; i < 16; i++)
    {
        int j;
        unsigned char *L = D;
        unsigned char *R = &(D[4]);
        unsigned char  Rexp[6];
        unsigned char  Rn[4];
        unsigned char  SubK[6];
 
        Permute( SubK, K, KeyCompression, 6 );
 
        Permute( Rexp, R, DataExpansion, 6 );
        xor( Rexp, Rexp, SubK, 6 );
 
        sbox( Rn, Rexp );
        Permute( Rexp, Rn, PBox, 4 );
        xor( Rn, L, Rexp, 4 );
 
        for (j = 0; j < 4; j++)
        {
            L[j] = R[j];
            R[j] = Rn[j];
        }
 
        KeyShiftRight( K, KeyRotation[15 - i] );
    }
 
    Permute( dst, D, FinalPermuteMap, 8 );
 
    return dst;
}

Referenced by SystemFunction002(), SystemFunction005(), SystemFunction013(), and SystemFunction025().

KeyShiftLeft()

static void KeyShiftLeft ( unsigned char *  key, const int  numbits  )

static

Definition at line 169 of file crypt_des.c.

{
    int i;
    unsigned char keep = key[0];
 
    for (i = 0; i < numbits; i++)
    {
        int j;
 
        for (j = 0; j < 7; j++)
        {
            if (j && (key[j] & 0x80))
                key[j-1] |=  0x01;
            key[j] <<= 1;
        }
 
        if (GETBIT( key, 27 ))
        {
            CLRBIT( key, 27 );
            SETBIT( key, 55 );
        }
 
        if (keep & 0x80)
            SETBIT( key, 27 );
 
        keep <<= 1;
    }
}

Referenced by CRYPT_DEShash().

KeyShiftRight()

static void KeyShiftRight ( unsigned char *  key, const int  numbits  )

static

Definition at line 198 of file crypt_des.c.

{
    int i;
    unsigned char keep = key[6];
 
    for (i = 0; i < numbits; i++)
    {
        int j;
 
        for (j = 6; j >= 0; j--)
        {
            if (j!=6 && (key[j] & 0x01))
                key[j+1] |=  0x80;
            key[j] >>= 1;
        }
 
        if (GETBIT( key, 28 ))
        {
            CLRBIT( key, 28 );
            SETBIT( key, 0 );
        }
 
        if (keep & 0x01)
            SETBIT( key, 28 );
 
        keep >>= 1;
    }
}

Referenced by CRYPT_DESunhash().

Permute()

static void Permute ( unsigned char *  dst, const unsigned char *  src, const unsigned char *  map, const int  mapsize  )

static

Definition at line 153 of file crypt_des.c.

{
    int bitcount, i;
 
    for (i = 0; i < mapsize; i++)
        dst[i] = 0;
 
    bitcount = mapsize * 8;
 
    for (i = 0; i < bitcount; i++)
    {
        if (GETBIT( src, map[i] ))
            SETBIT( dst, i );
    }
}

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

sbox()

static void sbox ( unsigned char *  dst, const unsigned char *  src  )

static

Definition at line 227 of file crypt_des.c.

{
    int i;
 
    for (i = 0; i < 4; i++)
        dst[i] = 0;
 
    for (i = 0; i < 8; i++)
    {
        int j, Snum, bitnum;
 
        for (Snum = j = 0, bitnum = (i * 6); j < 6; j++, bitnum++)
        {
            Snum <<= 1;
            Snum |= GETBIT( src, bitnum );
        }
 
        if (0 == (i%2))
            dst[i/2] |= ((SBox[i][Snum]) << 4);
        else
            dst[i/2] |= SBox[i][Snum];
    }
}

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

xor()

static void xor ( unsigned char *  dst, const unsigned char *  a, const unsigned char *  b, const int  count  )

static

Definition at line 251 of file crypt_des.c.

{
    int i;
 
    for (i = 0; i < count; i++)
        dst[i] = a[i] ^ b[i];
}

Referenced by crc32(), CRYPT_DEShash(), CRYPT_DESunhash(), MyAppendUnicodeToString_(), MyInitUnicodeString(), RtlAppendUnicodeToString(), UDFCheckZeroBuf(), UDFCrc(), UDFDissectName(), UDFGetExtentLength(), UDFGetMappingLength(), UDFIsIllegalChar(), UDFPhysLbaToPart(), UDFUnicodeCksum(), UDFUnicodeCksum150(), and WCacheGetSortedListIndex().

Variable Documentation

DataExpansion

const unsigned char DataExpansion[48]

static

Initial value:

=
{
    31,  0,  1,  2,  3,  4,  3,  4,
     5,  6,  7,  8,  7,  8,  9, 10,
    11, 12, 11, 12, 13, 14, 15, 16,
    15, 16, 17, 18, 19, 20, 19, 20,
    21, 22, 23, 24, 23, 24, 25, 26,
    27, 28, 27, 28, 29, 30, 31,  0
}

Definition at line 67 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

FinalPermuteMap

const unsigned char FinalPermuteMap[64]

static

Initial value:

=
{
     7, 39, 15, 47, 23, 55, 31, 63,
     6, 38, 14, 46, 22, 54, 30, 62,
     5, 37, 13, 45, 21, 53, 29, 61,
     4, 36, 12, 44, 20, 52, 28, 60,
     3, 35, 11, 43, 19, 51, 27, 59,
     2, 34, 10, 42, 18, 50, 26, 58,
     1, 33,  9, 41, 17, 49, 25, 57,
     0, 32,  8, 40, 16, 48, 24, 56
}

Definition at line 137 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

InitialPermuteMap

const unsigned char InitialPermuteMap[64]

static

Initial value:

=
{
    57, 49, 41, 33, 25, 17,  9, 1,
    59, 51, 43, 35, 27, 19, 11, 3,
    61, 53, 45, 37, 29, 21, 13, 5,
    63, 55, 47, 39, 31, 23, 15, 7,
    56, 48, 40, 32, 24, 16,  8, 0,
    58, 50, 42, 34, 26, 18, 10, 2,
    60, 52, 44, 36, 28, 20, 12, 4,
    62, 54, 46, 38, 30, 22, 14, 6
 }

Definition at line 31 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

KeyCompression

const unsigned char KeyCompression[48]

static

Initial value:

=
{
    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
}

Definition at line 57 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

KeyPermuteMap

const unsigned char KeyPermuteMap[56]

static

Initial value:

=
{
    49, 42, 35, 28, 21, 14,  7,  0,
    50, 43, 36, 29, 22, 15,  8,  1,
    51, 44, 37, 30, 23, 16,  9,  2,
    52, 45, 38, 31, 55, 48, 41, 34,
    27, 20, 13,  6, 54, 47, 40, 33,
    26, 19, 12,  5, 53, 46, 39, 32,
    25, 18, 11,  4, 24, 17, 10,  3,
}

Definition at line 43 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

KeyRotation

const unsigned char KeyRotation[16]

static

Initial value:

=
    { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }

Definition at line 54 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

PBox

const unsigned char PBox[32]

static

Initial value:

=
{
    15,  6, 19, 20, 28, 11, 27, 16,
     0, 14, 22, 25,  4, 17, 30,  9,
     1,  7, 23, 13, 31, 26,  2,  8,
    18, 12, 29,  5, 21, 10,  3, 24
}

Definition at line 129 of file crypt_des.c.

Referenced by CRYPT_DEShash(), and CRYPT_DESunhash().

SBox

const unsigned char SBox[8][64]

static

Definition at line 77 of file crypt_des.c.

Referenced by sbox().