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« : 30 Aralık 2007, 19:11:08 » |
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Program komut satırından çalıştırılıyor: ddes anahtar veri Şifrlemedekullanılan anahtar değeri şifrelem sonucunda elden edilen veriyleişleme sokuluyor.
Ekran Çıktısı:
ddes 1AC4D2E51C348725 8824580F3B91F5A9
Key: 1AC4D2E51C348725
Data: 8824580F3B91F5A9
Ciph: AF2538D23497CB2A
Kaynak Kod:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef unsigned char BYTE;
BYTE Key[8];
BYTE Data[8];
BYTE PC1[7];
BYTE SK[16][7];
BYTE PC2[16][6];
BYTE IP[8];
BYTE EXP[6];
BYTE SB[8];
BYTE SP[4];
BYTE ED[8];
BYTE PC1_Index[] = {
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4,
};
BYTE PC2_Index[] = {
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32,
};
BYTE IP_Index[] = {
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
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,
};
BYTE EXP_Index[] = {
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1,
};
BYTE S_Index[8][4][16] = {
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11,
};
BYTE P_Index[] = {
16, 7, 20, 21,
29, 12, 28, 17,
1, 15, 23, 26,
5, 18, 31, 10,
2, 8, 24, 14,
32, 27, 3, 9,
19, 13, 30, 6,
22, 11, 4, 25
};
BYTE F_Index[] = {
40, 8, 48, 16, 56, 24, 64, 32,
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25
};
BYTE LS[] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
/************************************************** ************************************************** /
void Permute(BYTE *Des, BYTE *Key, BYTE *Index, int Bits)
{
int i, j, kBit, kByte, dBit, dByte;
for (i = 0; i < Bits; ++i) {
j = Index - 1;
kByte = j / 8;
kBit = j % 8;
dByte = i / 8;
dBit = i % 8;
if (Key[kByte] & (1 << kBit))
Des[dByte] |= (1 << dBit);
else
Des[dByte] &= ~(1 << dBit);
}
}
/************************************************** ************************************************** /
void _RotateLeft(BYTE *Des, int Bits)
{
int i, c, c1, c2;
BYTE n;
while (Bits-- > 0) {
c1 = Des[0] & 0x80;
c2 = Des[3] & 0x10;
c = c2;
for (i = 6; i >= 0; --i) {
n = (Des << 1);
if (c)
n |= 1;
c = Des & 0x80;
Des = n;
}
Des[3] &= ~0x08;
if (c1)
Des[3] |= 0x08;
}
}
/************************************************** ************************************************** /
void RotateLeft(BYTE *Des, int Bits)
{
int i, c, c1, c2;
BYTE n;
while (Bits-- > 0) {
c1 = Des[0] & 1;
c2 = Des[3] & 0x10;
c = c2;
for (i = 6; i >= 0; --i) {
n = (Des >> 1);
if (c)
n |= 0x80;
c = Des & 1;
Des = n;
}
Des[3] &= ~0x08;
if (c1)
Des[3] |= 0x08;
}
}
/************************************************** ************************************************** /
void GenerateSubKeys(BYTE *SK, BYTE *Des)
{
int i;
for (i = 0; i < 16; ++i) {
RotateLeft(Des, LS);
memcpy(SK+7*i, Des, 7);
}
}
/************************************************** ************************************************** /
int GetBit(BYTE *Buffer, int Index)
{
int bit = Buffer[Index/8] & (1 << (Index%8));
return bit ? 1 : 0;
}
/************************************************** ************************************************** /
int main(int argc, char *argv[])
{
static char buf[16];
int i, j, k, b1, b2, b3, b4, n;
BYTE c;
if (argc < 3) {
printf("Usage: DES <Key> <Data>\n");
return 1;
}
if (strlen(argv[1]) != 16) {
printf("Key length must be 16 digits\n");
return 2;
}
if (strlen(argv[2]) != 16) {
printf("Data length must be 16 digits\n");
return 2;
}
for (i = 0; i < 8; ++i) {
strncpy(buf, argv[1] + 2*i, 2);
Key = (BYTE)strtoul(buf, NULL, 16);
}
for (i = 0; i < 8; ++i) {
strncpy(buf, argv[2] + 2*i, 2);
Data = (BYTE)strtoul(buf, NULL, 16);
}
Permute(PC1, Key, PC1_Index, 56);
printf(" Key: ");
for (i = 0; i < 8; ++i)
printf("%02X", Key);
printf("\n");
printf("Data: ");
for (i = 0; i < 8; ++i)
printf("%02X", Data);
printf("\n");
GenerateSubKeys(SK[0], PC1);
for (i = 0; i < 16; ++i)
Permute(PC2, SK, PC2_Index, 48);
Permute(IP, Data, IP_Index, 64);
for (n = 0; n < 16; ++n) {
Permute(EXP, IP, EXP_Index, 48);
for (i = 0; i < 6; ++i)
EXP ^= PC2[15-n];
memset(SB, '\0', 4);
for (i = 0; i < 8; ++i) {
b1 = GetBit(EXP, 6 * i);
b2 = GetBit(EXP, 6 * i + 5);
j = (b1 << 1) | b2;
b1 = GetBit(EXP, 6 * i + 1);
b2 = GetBit(EXP, 6 * i + 2);
b3 = GetBit(EXP, 6 * i + 3);
b4 = GetBit(EXP, 6 * i + 4);
k = (b1 << 3) | (b2 << 2) | (b3 << 1) | b4;
c = S_Index[j][k];
SB[i>>1] |= (i & 1) ? c << 4 : c;
}
Permute(SP, SB, P_Index, 32);
for (i = 0; i < 4; ++i)
SP ^= IP[i+4];
memcpy(IP+4, IP, 4);
memcpy(IP, SP, 4);
}
Permute(ED, IP, F_Index, 64);
printf("Ciph: ");
for (i = 0; i < 8; ++i)
printf("%02X", ED);
printf("\n");
printf("\n");
return 0;
}
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