Mine

#include "rosecrypt.hpp"int buildChecksum(char* csum, char* path){	char buf[0x200];	int bytesread=0;	HANDLE fh;	if (path==0) path = "TRose.exe";	fh = CreateFileA( path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 80, NULL );	if ( fh == INVALID_HANDLE_VALUE ) return -1;	SetFilePointer(fh, -512, NULL, FILE_END);	ReadFile(fh, buf, 0x200, (LPDWORD)&bytesread, NULL);	CloseHandle(fh);	if (bytesread!=0x200) return -2;		short keylen = buf[0x0f];	char* key = new char[keylen+1];	unsigned short key_ct[] = {0x94, 0x20, 0x5F, 0x53, 0x14, 0xF2, 0x61, 0x11, 0x54, 0xFF, 0x72, 0x99, 0x44, 0xF4, 0xA1, 0xAA, 0xBA, 0xC2, 0x54, 0x52, 0x6F, 0x73, 0x65, 0x2E, 0x65, 0x78, 0x65};		for(int i=0; i<keylen; i++)		key[i] = key_ct[i] ^ buf[0x18A + i];	int csumlen=0;	int multiplier=1;	for(int i=keylen; i>0; i--) {		int tmp = (key[i-1]-0x30)*multiplier;		multiplier *= 0x0a;		csumlen += tmp;	}	delete [] key;	unsigned short csumtable[] = {0x34, 0x5C, 0x3D, 0x52, 0xCE, 0xF3, 0x12, 0xD4, 0x05, 0x91, 0xEE, 0xFF, 0x49, 0xC2, 0xD2};		int tmp=0;	for(int i=0; i<csumlen; i++) {		csum[i] = csumtable[tmp] ^ buf[0x87 + i];		if (tmp==0x0e) tmp=0; else tmp++;	}	return csumlen;}void buildCryptTable(char* crypttable, char* checksum, int checksumlen){	for (int i=0; i<0x008; i++) crypttable[i]=0;	for (int i=0; i<0x100; i++) crypttable[i+8]=i;	int csumpos=0;	int modifier=0;	for (int i=0; i<0x40*4; i++) {			int curpos=crypttable[8+i];			modifier = (checksum[csumpos] + curpos + modifier) & 0xff;			crypttable[8+i] = crypttable[modifier+8];			crypttable[modifier+8] = curpos;			csumpos=++csumpos%checksumlen;	}}void cryptPacket(char *packet, char *crypttable){	unsigned short paksize=(*((unsigned short*)&packet[0])) - 2;	for(int i=0; i<paksize; i++) {		unsigned tmp1=(*((unsigned*)&crypttable[0]) + 1) & 0xff;		unsigned tmp2=(unsigned)crypttable[tmp1+8];		unsigned tmp3=((*((unsigned*)&crypttable[4]) + tmp2) & 0xff);		unsigned tmp4=crypttable[tmp3+8];		*((unsigned*)&crypttable[0]) = tmp1;		*((unsigned*)&crypttable[4]) = tmp3;		crypttable[tmp3+8] = tmp2;		crypttable[tmp1+8] = tmp4;		packet[i+2] = crypttable[((tmp4 + tmp2) & 0xff) + 8] ^ packet[i+2];	}}