?? d3des2.c
字號:
#include "d3des.h"
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] = {
0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67 };
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)
unsigned char *key;
short edf;
{
register int i, j, l, m, n;
unsigned char pc1m[56], pcr[56];
unsigned long kn[32];
/*******************************************************************/
//key為八位的 數組，如key[8]="abcedfgh",8等于2的3次冪,而每一個字節也是八位，同樣8等于2的3次冪
//所以所有64位只需6位下標就可以全部標識。
//高三位下標確定是key中的哪一個字符，低三位確定是字符中的哪一位。
/**********************************************************************************/
for ( j = 0; j < 56; j++ ) {
l = pc1[j];//for example l=56 when j=0;
m = l & 07; //m為低三位
pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1 : 0;
//l>>3確定高三位，bytebit[m]確定要置換的哪一位，兩數"與"即為置換。
}
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++ ) {
//實現循環右移對應位數的操作，前28位作為一個集合。
//totrot[i]決定循環右移的位數
l = j + totrot[i];//if j=0 then l= 0+1 =1
//if j=27, then l=27+1=28
if( l < 28 ) pcr[j] = pc1m[l];
else pcr[j] = pc1m[l - 28];
}
for( j = 28; j < 56; j++ ) {
//實現循環右移對應位數的操作，后28位作為一個集合。
l = j + totrot[i];
if( l < 56 ) pcr[j] = pc1m[l];
else pcr[j] = pc1m[l - 28];
}
for( j = 0; j < 24; j++ ) {
//此為一個置換，最終是把56位置換成48位；如果置換后的那一位為1，則密鑰中相應的位置1，共形成兩個24位的密鑰
if( pcr[pc2[j]] ) kn[m] |= bigbyte[j];
if( pcr[pc2[j+24]] ) kn[n] |= bigbyte[j];
}
}
//到目前為止形成了32個單元的數組，每個單元如：0X00FFFFFF的形式（此值代表32的long型中只有后24位存放有效數字）
//cookey的最終目的是把兩個0x00ffffff形式的long型值變成兩個0x3f3f3f3f形式的long型值，即把集中存放的key值分散開來放。
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為前24位，raw1為后24位
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 & 0x0000003fL);
}
//前24位，每六位一組，每組一個標號
111111(1),111111(5),111111(2),111111(6)
//后24位，每六位一組，每組一個標號
111111(3),111111(7),111111(4),111111(8)
拼成兩個32位的串：
0x3f3f3f3f(組號為1234)
0x3f3f3f3f(組號為5678)
//最終把形成的密鑰存放在全局變量KnL中
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;
{
//最終把形成的密鑰存放在全局變量KnL中
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);//該函數的作用是把一個8位字符串4個為一組放到兩個long型單元中，long型單元就是數組work
desfunc(work, KnL); //實質性的加解密操作，把解密后的信息放回work所指向的空間中。
unscrun(work, outblock);//把兩個long型單元拼成一個八位的字符串
return;
}
static void scrunch(outof, into)
register unsigned char *outof;
register unsigned long *into;
{ //outof="abcdefgh"
//該函數的作用是把一個8位字符串4個為一組放到兩個long型單元中
*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;
return;
}
static unsigned long 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 };
static unsigned long SP2[64] = {
0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
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