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des.c
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des.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "des.h"
static byte PC2[8][6] =
{
{ 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 }
};
static byte E[8][6] =
{
{ 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 }
};
static byte P[32] =
{
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
};
static byte SBOXES[4][64] =
{
{
0x2e, 0xe0, 0xc4, 0xbf, 0x4d, 0x27, 0x11, 0xc4,
0x72, 0x4e, 0xaf, 0x72, 0xbb, 0xdd, 0x68, 0x11,
0x83, 0x5a, 0x5a, 0x06, 0x36, 0xfc, 0xfc, 0xab,
0xd5, 0x39, 0x09, 0x95, 0xe0, 0x83, 0x97, 0x68,
0x44, 0xbf, 0x21, 0x8c, 0x1e, 0xc8, 0xb8, 0x72,
0xad, 0x14, 0xd6, 0xe9, 0x72, 0x21, 0x8b, 0xd7,
0xff, 0x65, 0x9c, 0xfb, 0xc9, 0x03, 0x57, 0x9e,
0x63, 0xaa, 0x3a, 0x40, 0x05, 0x56, 0xe0, 0x3d
},
{
0xcf, 0xa3, 0x11, 0xfd, 0xa8, 0x44, 0xfe, 0x27,
0x96, 0x7f, 0x2b, 0xc2, 0x63, 0x98, 0x84, 0x5e,
0x09, 0x6c, 0xd7, 0x10, 0x32, 0xd1, 0x4d, 0xea,
0xec, 0x06, 0x70, 0xb9, 0x55, 0x3b, 0xba, 0x85,
0x90, 0x4d, 0xee, 0x38, 0xf7, 0x2a, 0x5b, 0xc1,
0x2a, 0x93, 0x84, 0x5f, 0xcd, 0xf4, 0x31, 0xa2,
0x75, 0xbb, 0x08, 0xe6, 0x4c, 0x17, 0xa6, 0x7c,
0x19, 0x60, 0xd3, 0x05, 0xb2, 0x8e, 0x6f, 0xd9
},
{
0x4a, 0xdd, 0xb0, 0x07, 0x29, 0xb0, 0xee, 0x79,
0xf6, 0x43, 0x03, 0x94, 0x8f, 0x16, 0xd5, 0xaa,
0x31, 0xe2, 0xcd, 0x38, 0x9c, 0x55, 0x77, 0xce,
0x5b, 0x2c, 0xa4, 0xfb, 0x62, 0x8f, 0x18, 0x61,
0x1d, 0x61, 0x46, 0xba, 0xb4, 0xdd, 0xd9, 0x80,
0xc8, 0x16, 0x3f, 0x49, 0x73, 0xa8, 0xe0, 0x77,
0xab, 0x94, 0xf1, 0x5f, 0x62, 0x0e, 0x8c, 0xf3,
0x05, 0xeb, 0x5a, 0x25, 0x9e, 0x32, 0x27, 0xcc
},
{
0xd7, 0x1d, 0x2d, 0xf8, 0x8e, 0xdb, 0x43, 0x85,
0x60, 0xa6, 0xf6, 0x3f, 0xb9, 0x70, 0x1a, 0x43,
0xa1, 0xc4, 0x92, 0x57, 0x38, 0x62, 0xe5, 0xbc,
0x5b, 0x01, 0x0c, 0xea, 0xc4, 0x9e, 0x7f, 0x29,
0x7a, 0x23, 0xb6, 0x1f, 0x49, 0xe0, 0x10, 0x76,
0x9c, 0x4a, 0xcb, 0xa1, 0xe7, 0x8d, 0x2d, 0xd8,
0x0f, 0xf9, 0x61, 0xc4, 0xa3, 0x95, 0xde, 0x0b,
0xf5, 0x3c, 0x32, 0x57, 0x58, 0x62, 0x84, 0xbe
}
};
static byte PC1HI[][8] =
{
{ 7, 6, 5, 4, 3, 2, 1, 0, },
{ 7, 6, 5, 4, 3, 2, 1, 0, },
{ 7, 6, 5, 4, 3, 2, 1, 0, },
{ 7, 6, 5, 4, 7, 6, 5, 4, },
{ 3, 2, 1, 0, 7, 6, 5, 4, },
{ 3, 2, 1, 0, 7, 6, 5, 4, },
{ 3, 2, 1, 0, 3, 2, 1, 0, },
};
static byte PC1LO[][8] =
{
{ 7, 7, 7, 7, 7, 7, 7, 7, },
{ 6, 6, 6, 6, 6, 6, 6, 6, },
{ 5, 5, 5, 5, 5, 5, 5, 5, },
{ 4, 4, 4, 4, 1, 1, 1, 1, },
{ 1, 1, 1, 1, 2, 2, 2, 2, },
{ 2, 2, 2, 2, 3, 3, 3, 3, },
{ 3, 3, 3, 3, 4, 4, 4, 4, },
};
void doPC1(byte data[])
{
byte buf[8];
register byte j;
memset(buf, 0, 8);
//
for(j=0; j<7; j++) {
buf[j] |= ((data[PC1HI[j][0]]>>PC1LO[j][0]) & 1) << (7-0);
buf[j] |= ((data[PC1HI[j][1]]>>PC1LO[j][1]) & 1) << (7-1);
buf[j] |= ((data[PC1HI[j][2]]>>PC1LO[j][2]) & 1) << (7-2);
buf[j] |= ((data[PC1HI[j][3]]>>PC1LO[j][3]) & 1) << (7-3);
buf[j] |= ((data[PC1HI[j][4]]>>PC1LO[j][4]) & 1) << (7-4);
buf[j] |= ((data[PC1HI[j][5]]>>PC1LO[j][5]) & 1) << (7-5);
buf[j] |= ((data[PC1HI[j][6]]>>PC1LO[j][6]) & 1) << (7-6);
buf[j] |= ((data[PC1HI[j][7]]>>PC1LO[j][7]) & 1) << (7-7);
}
memcpy(data, buf, 8);
}
inline void doIp(byte data[])
{
unsigned char j, k;
byte val;
byte buf[8];
byte *p;
byte i = 8;
for(i=0; i<8; i++)
{
val = data[i];
p = &buf[3];
j = 4;
do
{
for(k=0; k<=4; k+=4)
{
p[k] >>= 1;
if(val & 1) p[k] |= 0x80;
val >>= 1;
}
p--;
} while(--j);
}
memcpy(data, buf, 8);
}
inline void doIp_1(byte data[])
{
unsigned char j, k;
byte r = 0;
byte buf[8];
byte *p;
byte i = 8;
for(i=0; i<8; i++)
{
p = &data[3];
j = 4;
do
{
for(k=0; k<=4; k+=4)
{
r >>= 1;
if(p[k] & 1) r |= 0x80;
p[k] >>= 1;
}
p--;
} while(--j);
buf[i] = r;
}
memcpy(data, buf, 8);
}
inline void makeK(byte *left, byte *right, byte *K)
{
byte i, j;
byte bit, val;
byte *p;
for(i=0; i<8; i++)
{
val = 0;
for(j=0; j<6; j++)
{
bit = PC2[i][j];
if(bit < 29)
{
bit = 28-bit;
p = left;
}
else
{
bit = 56-bit;
p = right;
}
val <<= 1;
if( p[bit >> 3] & (1 << (bit & 7)) ) val |= 1;
}
*K = val;
K++;
}
}
inline void rightRot(byte key[])
{
byte *p = key;
byte i = 3;
byte carry = 0;
if(*p & 1) carry = 0x08;
do {
*p = (*p >> 1) | ((p[1] & 1) ? 0x80 : 0);
p++;
} while(--i);
*p = (*p >> 1) | carry;
}
inline void rightRotKeys(byte left[], byte right[])
{
rightRot(left);
rightRot(right);
}
inline void leftRot(byte key[])
{
byte i = 27;
do {
rightRot(key);
} while(--i);
}
inline void leftRotKeys(byte left[], byte right[])
{
leftRot(left);
leftRot(right);
}
inline void desCore(byte data[], byte K[], byte result[])
{
byte i, j;
byte bit, val;
memset(result, 0, 4);
for(i=0; i<8; i++)
{
val = 0;
for(j=0; j<6; j++)
{
bit = 32-E[i][j];
val <<= 1;
if( data[3 - (bit >> 3)] & (1 << (bit & 7)) ) val |= 1;
}
val ^= K[i];
val = SBOXES[i & 3][val];
if(i > 3)
{
val >>= 4;
}
val &= 0x0f;
result[i >> 1] |= (i & 1) ? val : (val << 4);
}
}
inline void permut32(byte data[])
{
byte i, j;
byte bit;
byte r[4];
byte *p;
for(i=0; i<32; i++)
{
bit = 32-P[i];
p = r;
for(j=0; j<3; j++)
{
*p = (*p << 1) | ((p[1] & 0x80) ? 1 : 0);
p++;
}
*p <<= 1;
if( data[3 - (bit >> 3)] & (1 << (bit & 7)) ) *p |= 1;
}
memcpy(data, r, 4);
}
inline void swap(byte left[], byte right[])
{
byte x[4];
memcpy(x, right, 4);
memcpy(right, left, 4);
memcpy(left, x, 4);
}
inline void desRound(byte left[], byte right[], byte data[], byte mode, byte k8)
{
byte i;
byte K[8];
byte r[4];
byte tempr[4];
unsigned short temp;
memcpy(tempr, data+4, 4);
/* Viaccess */
temp = (short)k8*(short)tempr[0]+(short)k8+(short)tempr[0];
tempr[0] = (temp & 0xff) - ((temp>>8) & 0xff);
if((temp & 0xff) - (temp>>8) < 0)
tempr[0]++;
makeK(left, right, K);
desCore(tempr, K, r);
permut32(r);
if(mode & DES_HASH)
{
i = r[0];
r[0] = r[1];
r[1] = i;
}
/*
for(i=0; i<4; i++)
{
*data ^= r[i];
data++;
}
*/
*data ^= r[0]; data++;
*data ^= r[1]; data++;
*data ^= r[2]; data++;
*data ^= r[3]; data++;
swap(data-4, data);
}
inline void des(byte key[], byte mode, byte data[])
{
byte i;
byte left[8];
byte right[8];
byte *p = left;
short DESShift = (mode & DES_RIGHT) ? 0x8103 : 0xc081;
/*
for(i=3; i>0; i--)
{
*p = (key[i-1] << 4) | (key[i] >> 4);
p++;
}
*/
*p = (key[3-1] << 4) | (key[3] >> 4); p++;
*p = (key[2-1] << 4) | (key[2] >> 4); p++;
*p = (key[1-1] << 4) | (key[1] >> 4); p++;
left[3] = key[0] >> 4;
right[0] = key[6];
right[1] = key[5];
right[2] = key[4];
right[3] = key[3] & 0x0f;
if(mode & DES_IP) doIp(data);
do {
if(!(mode & DES_RIGHT))
{
leftRotKeys(left, right);
if(!(DESShift & 0x8000)) leftRotKeys(left, right);
}
desRound(left, right, data, mode, key[7]);
if(mode & DES_RIGHT)
{
rightRotKeys(left, right);
if(!(DESShift & 0x8000)) rightRotKeys(left, right);
}
DESShift <<= 1;
} while(DESShift);
swap(data, data+4);
if(mode & DES_IP_1) doIp_1(data);
}
inline byte getmask(byte *OutData, byte *Mask, byte I, byte J)
{
byte K, B, M, M1 , D, DI, MI;
K = I ^ J;
DI = 7;
if ((K & 4) == 4) {
K ^= 7;
DI ^= 7;
}
MI = 3;
MI &= J;
K ^= MI;
K += MI;
if ((K & 4) == 4) {
return 0;
}
DI ^= J;
D = OutData[DI];
MI = 0;
MI += J;
M1 = Mask[MI];
MI ^= 4;
M = Mask[MI];
B = 0;
for(K = 0; K <=7; K++)
{
if ((D & 1) == 1) B += M;
D = (D >> 1) + ((B & 1) << 7);
B = B >> 1;
}
return D ^ M1;
}
inline void v2mask(byte *cw, byte *mask)
{
register int i, j;
for(i = 7; i >= 0; i--) {
cw[i] ^= getmask(cw, mask, i, 7);
cw[i] ^= getmask(cw, mask, i, 6);
cw[i] ^= getmask(cw, mask, i, 5);
cw[i] ^= getmask(cw, mask, i, 4);
}
for(i = 0; i <= 7; i++) {
cw[i] ^= getmask(cw, mask, i, 0);
cw[i] ^= getmask(cw, mask, i, 1);
cw[i] ^= getmask(cw, mask, i, 2);
cw[i] ^= getmask(cw, mask, i, 3);
}
}
/*
inline void v2mask(byte *cw, byte *mask)
{
int i, j;
for(i = 7; i >= 0; i--)
for(j = 7; j >=4; j--)
cw[i] ^= getmask(cw, mask, i, j);
for(i = 0; i <= 7; i++)
for(j = 0; j <=3; j++)
cw[i] ^= getmask(cw, mask, i, j);
}
*/
void EuroDes(byte key1[], byte key2[], byte desMode, byte operatingMode, byte data[])
{
byte mode;
if(key1[7]) { /* Viaccess */
mode = (operatingMode == HASH) ? DES_ECM_HASH : DES_ECM_CRYPT;
if(key2 != NULL)
v2mask(data, key2);
des(key1, mode, data);
if(key2 != NULL)
v2mask(data, key2);
}
else if(TestBit(desMode, F_TRIPLE_DES))
{
/* Eurocrypt 3-DES */
mode = (operatingMode == HASH) ? 0 : DES_RIGHT;
des(key1, (byte)(DES_IP | mode), data);
mode ^= DES_RIGHT;
des(key2, mode, data);
mode ^= DES_RIGHT;
des(key1, (byte)(mode | DES_IP_1), data);
}
else
{
if(TestBit(desMode, F_EURO_S2))
{
/* Eurocrypt S2 */
mode = (operatingMode == HASH) ? DES_ECS2_CRYPT : DES_ECS2_DECRYPT;
}
else
{
/* Eurocrypt M */
mode = (operatingMode == HASH) ? DES_ECM_HASH : DES_ECM_CRYPT;
}
des(key1, mode, data);
}
}
/*------------------------------------------------------------------------*/
inline void des_key_parity_adjust(byte *key, byte len)
{
register byte i, j, parity;
for (i = 0; i < len; i++)
{
parity = 1;
// for (j = 1; j < 8; j++) if ((key[i] >> j) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 1) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 2) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 3) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 4) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 5) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 6) & 0x1) parity = ~parity & 0x01;
if ((key[i] >> 7) & 0x1) parity = ~parity & 0x01;
key[i] |= parity;
}
}
inline void des_key_spread(byte *normal,byte *spread)
{
spread[ 0] = normal[ 0] & 0xfe;
spread[ 1] = ((normal[ 0] << 7) | (normal[ 1] >> 1)) & 0xfe;
spread[ 2] = ((normal[ 1] << 6) | (normal[ 2] >> 2)) & 0xfe;
spread[ 3] = ((normal[ 2] << 5) | (normal[ 3] >> 3)) & 0xfe;
spread[ 4] = ((normal[ 3] << 4) | (normal[ 4] >> 4)) & 0xfe;
spread[ 5] = ((normal[ 4] << 3) | (normal[ 5] >> 5)) & 0xfe;
spread[ 6] = ((normal[ 5] << 2) | (normal[ 6] >> 6)) & 0xfe;
spread[ 7] = normal[ 6] << 1;
spread[ 8] = normal[ 7] & 0xfe;
spread[ 9] = ((normal[ 7] << 7) | (normal[ 8] >> 1)) & 0xfe;
spread[10] = ((normal[ 8] << 6) | (normal[ 9] >> 2)) & 0xfe;
spread[11] = ((normal[ 9] << 5) | (normal[10] >> 3)) & 0xfe;
spread[12] = ((normal[10] << 4) | (normal[11] >> 4)) & 0xfe;
spread[13] = ((normal[11] << 3) | (normal[12] >> 5)) & 0xfe;
spread[14] = ((normal[12] << 2) | (normal[13] >> 6)) & 0xfe;
spread[15] = normal[13] << 1;
des_key_parity_adjust(spread, 16);
}
inline void des_random_get(byte *buffer, byte len)
{
byte idx = 0;
int randomNo = 0;
for (idx = 0; idx < len; idx++)
{
if (!(idx % 3)) randomNo = rand();
buffer[idx] = (randomNo >> ((idx % 3) << 3)) & 0xff;
}
}
//#define CWS_NETMSGSIZE 300
int des_encrypt(byte *buffer, int len, byte *deskey)
{
byte checksum = 0;
byte noPadBytes;
byte padBytes[7];
char ivec[8];
register short i;
if (!deskey) return len;
noPadBytes = (8 - ((len - 1) % 8)) % 8;
//if (len + noPadBytes + 1 >= CWS_NETMSGSIZE-8) return -1;
des_random_get(padBytes, noPadBytes);
for (i = 0; i < noPadBytes; i++) buffer[len++] = padBytes[i];
for (i = 2; i < len; i++) checksum ^= buffer[i];
buffer[len++] = checksum;
des_random_get((byte *)ivec, 8);
memcpy(buffer+len, ivec, 8);
for (i = 2; i < len; i += 8)
{
byte j;
const byte flags = (1 << F_EURO_S2) | (1 << F_TRIPLE_DES);
// for(j=0; j<8; j++) buffer[i+j] ^= ivec[j];
buffer[i+0] ^= ivec[0];
buffer[i+1] ^= ivec[1];
buffer[i+2] ^= ivec[2];
buffer[i+3] ^= ivec[3];
buffer[i+4] ^= ivec[4];
buffer[i+5] ^= ivec[5];
buffer[i+6] ^= ivec[6];
buffer[i+7] ^= ivec[7];
EuroDes(deskey, deskey+8, flags, 1, buffer+i);
memcpy(ivec, buffer+i, 8);
}
len += 8;
return len;
}
int des_decrypt(byte *buffer, int len, byte *deskey)
{
char ivec[8];
char nextIvec[8];
int i;
byte checksum = 0;
if (!deskey) return len;
if ((len-2) % 8 || (len-2) < 16) return -1;
len -= 8;
memcpy(nextIvec, buffer+len, 8);
for (i = 2; i < len; i += 8)
{
byte j;
const byte flags = (1 << F_EURO_S2) | (1 << F_TRIPLE_DES);
memcpy(ivec, nextIvec, 8);
memcpy(nextIvec, buffer+i, 8);
EuroDes(deskey, deskey+8, flags, 0, buffer+i);
for(j=0; j<8; j++)
buffer[i+j] ^= ivec[j];
}
for (i = 2; i < len; i++) checksum ^= buffer[i];
if (checksum) return -1;
return len;
}
void des_login_key_get(byte *key1, byte *key2, int len, byte *des16)
{
byte des14[14];
int i;
memcpy(des14, key1, sizeof(des14));
for (i = 0; i < len; i++) des14[i%14] ^= key2[i];
des_key_spread(des14, des16);
doPC1(des16);
doPC1(des16+8);
}