📄 des.cpp
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#define EN0 0 /* MODE == encrypt */
#define DE1 1 /* MODE == decrypt */
typedef struct {
unsigned long ek[32];
unsigned long dk[32];
} des_ctx;
extern void deskey(unsigned char *, short);
/* hexkey[8] MODE
* Sets the internal key register according to the hexadecimal
* key contained in the 8 bytes of hexkey, according to the DES,
* for encryption or decryption according to MODE.
*/
extern void usekey(unsigned long *);
/* cookedkey[32]
* Loads the internal key register with the data in cookedkey.
*/
extern void cpkey(unsigned long *);
/* cookedkey[32]
* Copies the contents of the internal key register into the storage
* located at &cookedkey[0].
*/
extern void des(unsigned char *, unsigned char *);
/* from[8] to[8]
* Encrypts/Decrypts (according to the key currently loaded in the
* internal key register) one block of eight bytes at address `from'
* into the block at address `to'. They can be the same.
*/
static void scrunch(unsigned char *, unsigned long *);
static void unscrun(unsigned long *, unsigned char *);
static void desfunc(unsigned long *, unsigned long *);
static void cookey(unsigned long *);
static unsigned long KnL[32] = { 0L };
static unsigned long KnR[32] = { 0L };
static unsigned long Kn3[32] = { 0L };
static unsigned char Df_Key[24] = {
0?1,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
0x89,0xab,0xcd,0xef,0?1,0x23,0x45,0x67 };
static unsigned short bytebit[8] = {
0200, 0100, 040, 020, 010, 04, 02, 01 };
static unsigned long 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 };
/* Use the key schedule specified in the Standard (ANSI X3.92-1981). */
static unsigned char 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 };
static unsigned char totrot[16] = {
1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28 };
static unsigned char 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 };
void deskey(key, edf) /* Thanks to James Gillogly & Phil Karn! */
unsigned char *key;
short edf;
{
register int i, 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( i = 0; i < 16; i++ ) {
if( edf == DE1 ) 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;
}
static void cookey(raw1)
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 & 0?0fc0000L) << 6;
*cook |= (*raw0 & 0?0000fc0L) << 10;
*cook |= (*raw1 & 0?0fc0000L) >> 10;
*cook++ |= (*raw1 & 0?0000fc0L) >> 6;
*cook = (*raw0 & 0?003f000L) << 12;
*cook |= (*raw0 & 0?000003fL) << 16;
*cook |= (*raw1 & 0?003f000L) >> 4;
*cook++ |= (*raw1 & 0?000003fL);
}
usekey(dough);
return;
}
void cpkey(into)
register unsigned long *into;
{
register unsigned long *from, *endp;
from = KnL, endp = &KnL[32];
while( from < endp ) *into++ = *from++;
return;
}
void usekey(from)
register unsigned long *from;
{
register unsigned long *to, *endp;
to = KnL, endp = &KnL[32];
while( to < endp ) *to++ = *from++;
return;
}
void des(inblock, outblock)
unsigned char *inblock, *outblock;
{
unsigned long work[2];
scrunch(inblock, work);
desfunc(work, KnL);
unscrun(work, outblock);
return;
}
static void scrunch(outof, into)
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;
}
static void unscrun(outof, into)
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;
}
static unsigned long SP1[64] = {
0?1010400L, 0?0000000L, 0?0010000L, 0?1010404L,
0?1010004L, 0?0010404L, 0?0000004L, 0?0010000L,
0?0000400L, 0?1010400L, 0?1010404L, 0?0000400L,
0?1000404L, 0?1010004L, 0?1000000L, 0?0000004L,
0?0000404L, 0?1000400L, 0?1000400L, 0?0010400L,
0?0010400L, 0?1010000L, 0?1010000L, 0?1000404L,
0?0010004L, 0?1000004L, 0?1000004L, 0?0010004L,
0?0000000L, 0?0000404L, 0?0010404L, 0?1000000L,
0?0010000L, 0?1010404L, 0?0000004L, 0?1010000L,
0?1010400L, 0?1000000L, 0?1000000L, 0?0000400L,
0?1010004L, 0?0010000L, 0?0010400L, 0?1000004L,
0?0000400L, 0?0000004L, 0?1000404L, 0?0010404L,
0?1010404L, 0?0010004L, 0?1010000L, 0?1000404L,
0?1000004L, 0?0000404L, 0?0010404L, 0?1010400L,
0?0000404L, 0?1000400L, 0?1000400L, 0?0000000L,
0?0010004L, 0?0010400L, 0?0000000L, 0?1010004L };
static unsigned long SP2[64] = {
0x80108020L, 0x80008000L, 0?0008000L, 0?0108020L,
0?0100000L, 0?0000020L, 0x80100020L, 0x80008020L,
0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
0x80008000L, 0?0100000L, 0?0000020L, 0x80100020L,
0?0108000L, 0?0100020L, 0x80008020L, 0?0000000L,
0x80000000L, 0?0008000L, 0?0108020L, 0x80100000L,
0?0100020L, 0x80000020L, 0?0000000L, 0?0108000L,
0?0008020L, 0x80108000L, 0x80100000L, 0?0008020L,
0?0000000L, 0?0108020L, 0x80100020L, 0?0100000L,
0x80008020L, 0x80100000L, 0x80108000L, 0?0008000L,
0x80100000L, 0x80008000L, 0?0000020L, 0x80108020L,
0?0108020L, 0?0000020L, 0?0008000L, 0x80000000L,
0?0008020L, 0x80108000L, 0?0100000L, 0x80000020L,
0?0100020L, 0x80008020L, 0x80000020L, 0?0100020L,
0?0108000L, 0?0000000L, 0x80008000L, 0?0008020L,
0x80000000L, 0x80100020L, 0x80108020L, 0?0108000L };
static unsigned long SP3[64] = {
0?0000208L, 0?8020200L, 0?0000000L, 0?8020008L,
0?8000200L, 0?0000000L, 0?0020208L, 0?8000200L,
0?0020008L, 0?8000008L, 0?8000008L, 0?0020000L,
0?8020208L, 0?0020008L, 0?8020000L, 0?0000208L,
0?8000000L, 0?0000008L, 0?8020200L, 0?0000200L,
0?0020200L, 0?8020000L, 0?8020008L, 0?0020208L,
0?8000208L, 0?0020200L, 0?0020000L, 0?8000208L,
0?0000008L, 0?8020208L, 0?0000200L, 0?8000000L,
0?8020200L, 0?8000000L, 0?0020008L, 0?0000208L,
0?0020000L, 0?8020200L, 0?8000200L, 0?0000000L,
0?0000200L, 0?0020008L, 0?8020208L, 0?8000200L,
0?8000008L, 0?0000200L, 0?0000000L, 0?8020008L,
0?8000208L, 0?0020000L, 0?8000000L, 0?8020208L,
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