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| #include "inc\stdio.h"
typedef unsigned char byte;
typedef unsigned long dword;
byte S[8][16]={{3,8,15,1,10,6,5,11,14,13,4,2,7,0,9,12},
{15,12,2,7,9,0,5,10,1,11,14,8,6,13,3,4},
{8,6,7,9,3,12,10,15,13,1,14,4,0,11,5,2},
{0,15,11,8,12,9,6,3,13,1,2,4,10,7,5,14},
{1,15,8,3,12,0,11,6,2,5,4,10,9,14,7,13},
{15,5,2,11,4,10,9,12,0,3,14,8,13,6,7,1},
{7,2,12,5,8,4,6,11,14,9,1,15,13,3,10,0},
{1,13,15,0,14,8,2,11,7,4,12,10,9,3,5,6}};
byte InvS[8][16]={{13,3,11,0,10,6,5,12,1,14,4,7,15,9,8,2},
{5,8,2,14,15,6,12,3,11,4,7,9,1,13,10,0},
{12,9,15,4,11,14,1,2,0,3,6,13,5,8,10,7},
{0,9,10,7,11,14,6,13,3,5,12,2,4,8,15,1},
{5,0,8,3,10,9,7,14,2,12,11,6,4,15,13,1},
{8,15,2,9,4,1,13,14,11,6,5,3,7,12,10,0},
{15,10,1,13,5,3,6,0,4,9,14,7,2,12,8,11},
{3,0,6,13,9,14,15,8,5,12,11,7,10,1,4,2}};
FILE *f;
byte buf[2048];
dword pkey[140],GR=0x9E3779B9,key[132];
char fkey[]="key32_d6.bin";
char fres[]="!serp.enc";
char c;
dword subst(byte T[8][16], dword k, byte n) {
byte i,j;
dword t=0;
for(i=0;i<8;i++) {
j=k>>28;
j=T[n][j]; k<<=4;
t<<=4; t|=j;
}
return(t);
}
void KeySched(void) {
byte i,j;
dword tmp;
for(i=8;i<140;i++) {
tmp=pkey[i-8]^pkey[i-5]^pkey[i-3]^pkey[i-1]^GR^(i-8);
pkey[i]=_lrotl(tmp,11);
}
j=3;
for(i=0;i<132;i++) {
tmp=subst(S,pkey[i+8],j);
key[i]=tmp;
if((i+1)&3==0) {
j--; if(j>7) j=7;
}
}
return;
}
void encrypt(int bsize) {
byte i,j,nkey,*pp;
dword tmp[4],*p1,*p2;
pp=&buf; p1=(dword*)pp; p2=p1;
do {
for(i=0;i<4;i++) {
tmp[i]=*p1; p1++;
}
nkey=0;
for(i=0;i<32;i++) { //i - round number
for(j=0;j<4;j++) tmp[j]^=key[nkey+j];
nkey+=4;
for(j=0;j<4;j++) tmp[j]=subst(S,tmp[j],i&7);
if(i<31) {
tmp[0]=_lrotl(tmp[0],13); tmp[2]=_lrotl(tmp[2],3);
tmp[1]^=(tmp[0]^tmp[2]);
tmp[3]^=(tmp[2]^(tmp[0]<<3));
tmp[1]=_lrotl(tmp[1],1); tmp[3]=_lrotl(tmp[3],7);
tmp[0]^=(tmp[1]^tmp[3]);
tmp[2]^=(tmp[3]^(tmp[1]<<7));
tmp[0]=_lrotl(tmp[0],5); tmp[2]=_lrotl(tmp[2],22);
} else {
tmp[0]^=key[128]; tmp[1]^=key[129];
tmp[2]^=key[130]; tmp[3]^=key[131];
}
}
for(i=0;i<4;i++) {
*p2=tmp[i]; p2++;
}
bsize-=16;
} while (bsize>0);
return;
}
void decrypt(int bsize) {
byte i,j,nkey,*pp;
dword tmp[4],*p1,*p2;
pp=&buf; p1=(dword*)pp; p2=p1;
do {
for(i=0;i<4;i++) {
tmp[i]=*p1; p1++;
}
nkey=124;
for(i=31;i<=31;i--) { //i - round number
if(i<31) {
tmp[0]=_lrotr(tmp[0],5); tmp[2]=_lrotr(tmp[2],22);
tmp[2]^=(tmp[3]^(tmp[1]<<7));
tmp[0]^=(tmp[1]^tmp[3]);
tmp[1]=_lrotr(tmp[1],1); tmp[3]=_lrotr(tmp[3],7);
tmp[3]^=(tmp[2]^(tmp[0]<<3));
tmp[1]^=(tmp[0]^tmp[2]);
tmp[0]=_lrotr(tmp[0],13); tmp[2]=_lrotr(tmp[2],3);
} else {
tmp[0]^=key[128]; tmp[1]^=key[129];
tmp[2]^=key[130]; tmp[3]^=key[131];
}
for(j=0;j<4;j++) tmp[j]=subst(InvS,tmp[j],i&7);
for(j=0;j<4;j++) tmp[j]^=key[nkey+j];
nkey-=4;
}
for(i=0;i<4;i++) {
*p2=tmp[i]; p2++;
}
bsize-=16;
} while (bsize>0);
return;
}
main(int z, char* fnm[]) {
int res;
if((f=fopen(fkey,"rb"))==NULL) {
puts("Error open key file.");
exit(1);
}
res=fread(pkey,4,8,f);
fclose(f);
if(res!=8) {
puts("Error key size. Must be 32 bytes.");
exit(1);
}
if((f=fopen(fnm[1],"rb"))==NULL) {
puts("Error open data file.");
exit(1);
}
res=fread(buf,1,sizeof(buf),f);
fclose(f);
if((res%16)!=0 || res==0) {
puts("Error data size. Must be mutiple to 16 bytes.");
exit(1);
}
KeySched();
printf("\nMode ? (1-Encrypt, 2-Decrypt) --> ");
c=getchar();
if(c=='1') encrypt(res); else decrypt(res);
if((f=fopen(fres,"wb"))==NULL) {
puts("Error open result file.");
exit(1);
}
fwrite(buf,1,res,f);
fclose(f);
} |
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Сообщение от Rigget
