本帖最后由 muhp3 于 2014-7-2 10:54 编辑
最后一个函数DES_Operate是加解密函数
void CBCfunc(unsigned char* pucData, unsigned char BlockNumber){
int i;
for (i=0; i<8; i++){
pucData[(BlockNumber -1)*8 + i] = pucData[(BlockNumber -2)*8 +i] ^ pucData[(BlockNumber -1)*8 +i];
}
}
void deskey(unsigned char *key, short edf) {
/* Thanks to James Gillogly & Phil Karn! */
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;
if( l < 28 ) pcr[j] = pc1m[l];
else pcr[j] = pc1m[l - 28];
}
for( j = 28; j < 56; j++ ) {
l = j + totrot;
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);
}
static void cookey(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 & 0x00fc0000L) << 6;
*cook |= (*raw0 & 0x00000fc0L) << 10;
*cook |= (*raw1 & 0x00fc0000L) >> 10;
*cook++|= (*raw1 & 0x00000fc0L) >> 6;
*cook = (*raw0 & 0x0003f000L) << 12;
*cook |= (*raw0 & 0x0000003fL) << 16;
*cook |= (*raw1 & 0x0003f000L) >> 4;
*cook++ |= (*raw1 & 0x0000003fL);
}
usekey(dough);
}
void cpkey(unsigned long *into) {
register unsigned long *from, *endp;
from = KnL, endp = &KnL[32];
while( from < endp ) *into++ = *from++;
}
void usekey(unsigned long *from) {
register unsigned long *to, *endp;
to = KnL, endp = &KnL[32];
while( to < endp ) *to++ = *from++;
}
/*
#if 0
void des(unsigned char *inblock, unsigned char *outblock) {
unsigned long work[2];
scrunch(inblock, work);
desfunc(work, KnL);
unscrun(work, outblock);
}
#endif
*/
static void scrunch(unsigned char *outof, 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);
}
static void unscrun(unsigned long *outof, 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;
}
static void desfunc(unsigned long *block, unsigned long *keys) {
register unsigned long fval, work, right, leftt;
register int round;
leftt = block[0];
right = block[1];
work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
right ^= work;
leftt ^= (work << 4);
work = ((leftt >> 16) ^ right) & 0x0000ffffL;
right ^= work;
leftt ^= (work << 16);
work = ((right >> 2) ^ leftt) & 0x33333333L;
leftt ^= work;
right ^= (work << 2);
work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
leftt ^= work;
right ^= (work << 8);
right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;
for( round = 0; round < 8; round++ ) {
work = (right << 28) | (right >> 4);
work ^= *keys++;
fval = SP7[ work & 0x3fL];
fval |= SP5[(work >> 8) & 0x3fL];
fval |= SP3[(work >> 16) & 0x3fL];
fval |= SP1[(work >> 24) & 0x3fL];
work = right ^ *keys++;
fval |= SP8[ work & 0x3fL];
fval |= SP6[(work >> 8) & 0x3fL];
fval |= SP4[(work >> 16) & 0x3fL];
fval |= SP2[(work >> 24) & 0x3fL];
leftt ^= fval;
work = (leftt << 28) | (leftt >> 4);
work ^= *keys++;
fval = SP7[ work & 0x3fL];
fval |= SP5[(work >> 8) & 0x3fL];
fval |= SP3[(work >> 16) & 0x3fL];
fval |= SP1[(work >> 24) & 0x3fL];
work = leftt ^ *keys++;
fval |= SP8[ work & 0x3fL];
fval |= SP6[(work >> 8) & 0x3fL];
fval |= SP4[(work >> 16) & 0x3fL];
fval |= SP2[(work >> 24) & 0x3fL];
right ^= fval;
}
right = (right << 31) | (right >> 1);
work = (leftt ^ right) & 0xaaaaaaaaL;
leftt ^= work;
right ^= work;
leftt = (leftt << 31) | (leftt >> 1);
work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
right ^= work;
leftt ^= (work << 8);
work = ((leftt >> 2) ^ right) & 0x33333333L;
right ^= work;
leftt ^= (work << 2);
work = ((right >> 16) ^ leftt) & 0x0000ffffL;
leftt ^= work;
right ^= (work << 16);
work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
leftt ^= work;
right ^= (work << 4);
*block++ = right;
*block = leftt;
}
/* Validation sets:
*
* Single-length key, single-length plaintext -
* Key : 0123 4567 89ab cdef
* Plain : 0123 4567 89ab cde7
* Cipher : c957 4425 6a5e d31d
*
**********************************************************************/
void Des_Key(des_ctx *dc, unsigned char *pucKey, short sMode){
if (sMode == EN0){
deskey(pucKey,sMode);
cpkey(dc->ek);
}
else if(sMode == DE1) {
deskey(pucKey, sMode);
cpkey(dc->dk);
}
else if(sMode == ENDE){
deskey(pucKey,EN0);
cpkey(dc->ek);
deskey(pucKey,DE1);
cpkey(dc->dk);
}
}
/* Encrypt several blocks in ECB sMode. Caller is responsible for
short blocks. */
void Des_Enc(des_ctx *dc, unsigned char *pucData, short sBlocks){
unsigned long work[2];
int i;
unsigned char *cp;
cp = pucData;
for(i=0;i<sBlocks;i++){
scrunch(cp,work);
desfunc(work,dc->ek);
unscrun(work,cp);
cp+=8;
}
}
void Des_Dec(des_ctx *dc, unsigned char *pucData, short sBlocks){
unsigned long work[2];
int i;
unsigned char *cp;
cp = pucData;
for(i=0;i<sBlocks;i++){
scrunch(cp,work);
desfunc(work,dc->dk);
unscrun(work,cp);
cp+=8;
}
}
void TripleDES_ENC( des_ctx *dc,unsigned char *pucData, short sBlocks, unsigned char *pucKey1, unsigned char *pucKey2, unsigned char *pucKey3){
Des_Key(dc,pucKey1, EN0);
Des_Enc(dc,pucData,sBlocks);
Des_Key(dc,pucKey2, DE1);
Des_Dec(dc, pucData, sBlocks);
Des_Key(dc,pucKey3, EN0);
Des_Enc(dc,pucData,sBlocks);
}
void TripleDES_DEC( des_ctx *dc,unsigned char *pucData, short sBlocks,unsigned char *pucKey1,unsigned char *pucKey2,unsigned char *pucKey3){
Des_Key(dc,pucKey3, DE1);
Des_Dec(dc, pucData, sBlocks);
Des_Key(dc,pucKey2, EN0);
Des_Enc(dc,pucData,sBlocks);
Des_Key(dc,pucKey1, DE1);
Des_Dec(dc, pucData, sBlocks);
}
void TripleDES_ENC_CBC( des_ctx *dc,unsigned char *pucData, short sBlocks,unsigned char *pucIV, unsigned char *pucKey1, unsigned char *pucKey2, unsigned char *pucKey3){
int i,f,x;
des_ctx dc1, dc2, dc3;
Des_Key(&dc1,pucKey1, EN0);
Des_Key(&dc2,pucKey2, DE1);
Des_Key(&dc3,pucKey3, EN0);
for (f=0;f<16;f++){
pucData[f] ^= pucIV[f];
}
for(i=0; i< sBlocks; i++){
x=i*16;
Des_Enc(&dc1,&pucData[x],1);
Des_Dec(&dc2,&pucData[x],1);
Des_Enc(&dc3,&pucData[x],1);
if( i < (sBlocks-1)){
for(f=0;f<16;f++){
pucIV[x+f] = pucData[x+f];
}
}
else{
for(f=0;f<16;f++){
pucData[x+f+16] = pucData[x+f];
}
}
}
}
void TripleDES_DEC_CBC( des_ctx *dc,unsigned char *pucData, short sBlocks, unsigned char *pucIV, unsigned char *pucKey1,unsigned char *pucKey2,unsigned char *pucKey3){
int i,f,x;
des_ctx dc1, dc2, dc3;
unsigned char temp[8];
if(sBlocks<=1){ //Sanity Check
return;
}
else{
Des_Key(&dc1,pucKey3, DE1); //Key Schedules
Des_Key(&dc2,pucKey2, EN0);
Des_Key(&dc3,pucKey1, DE1);
x=(sBlocks-1)*16; // address of start of last block of data
for(f=0;f<16;f++){
temp[f] = pucData[x+f]; //Copy newIV to Temp
}
for(i=0;i<sBlocks;i++){
Des_Dec(&dc1,&pucData[x],1); //3DES algorithm
Des_Enc(&dc2,&pucData[x],1);
Des_Dec(&dc3,&pucData[x],1);
x = x-16;
if(x >= 0){
for(f=0;f<16;f++){
pucData[x+f+16] ^= pucData[x+f]; //XOR block with input of next block
}
}
else{
for(f=0;f<16;f++){
pucData[f] ^= pucIV[f]; // XOR first block with IV
pucIV[f] = temp[f]; //Update IV;
}
}
}
}
}
void DES_Enc_CBC (des_ctx *dc,unsigned char *pucData, short sBlocks, unsigned char *pucIV){
int CurrentBlock = 1;
//unsigned char bx[8];
//unsigned char ax[8];
unsigned char d =0;
unsigned char *cp;
int i;
cp = pucData;
if (sBlocks <= 1) return;
else{
for(i=0; i<8; i++){
pucData ^= pucIV;
}
while(CurrentBlock < sBlocks){
Des_Enc(dc,cp,1);
// for(i=0;i<8;i++){
// bx = pucData[i+d];
// }
for (i=0; i <8; i++){
pucData[i+8+d] ^= pucData[i+d];
}
// for(i=0;i<8;i++){
// ax[i+d] = pucData[i+d];
// }
cp+=8;
CurrentBlock++;
d+=8;
}
Des_Enc(dc,cp,1);
for(i=0; i<8; i++){
pucIV = cp;
}
// for(i=0;i<8;i++){
// ax = pucData[i+d];
// }
//d=ax[0];
}
}
void DES_Dec_CBC (des_ctx *dc,unsigned char *pucData, short sBlocks, unsigned char *pucIV){
int CurrentBlock;
//unsigned char bx[8];
//unsigned char ax[8];
unsigned char d =0;
unsigned char *cp;
unsigned char temp[8];
int i;
cp = pucData + (sBlocks-1)*8; //Starting DEC backwards
CurrentBlock = sBlocks;
for (i=0; i <8; i++){
temp = cp; //Copying new pucIV (updated version)
}
if (sBlocks <= 1) return;
else{
while(CurrentBlock != 1){
Des_Dec(dc,cp,1); //dec last block
d= (CurrentBlock -1) *8; //reset block count
// for(i=0;i<8;i++){
// bx = pucData[i+d];
// }
for (i=0; i <8; i++){
pucData[i+d] ^= pucData[i+ d - 8]; //xor op
}
// for(i=0;i<8;i++){
// ax[i+d] = pucData[i+d];
// }
cp-=8;
CurrentBlock--;
//d+=8;
}
Des_Dec(dc,cp,1);
for (i=0; i <8; i++){
pucData ^= pucIV;
pucIV = temp;
}
// for(i=0;i<8;i++){
// ax = pucData[i+d];
// }
// d=ax[0];
}
}
//====================================================
// DES operate
// mode: 0x00-DES
// oper: 0x00-Encrypt,0x01-Decrypt
//====================================================
unsigned char DES_Operate(unsigned char mode,unsigned char oper,unsigned char * desdata,unsigned short len)
{
des_ctx dc;
unsigned char key[8] = {0x5a,0x12,0x34,0x56,0x78,0x9a,0xbc,0xa5};
if(len == 0x00)len = 0x100; // P3=0x00,operate 256 bytes
Des_Key(&dc,key, ENDE);
if((mode != 0x00) || (oper > 0x01))return 0; // P1,P2 wrong
else
{
if(oper == 0x00)Des_Enc(&dc, desdata, (len-1)/8+1); // Encryption
else if(oper == 0x01)Des_Dec(&dc, desdata, (len-1)/8+1);// Decryption
return 1;
}
}
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