gersang.c

网络游戏巨商的加密解密技术分析。 如果有哪位兄台有比较好的意见

#include <stdio.h>
#include "seedx.h"

void gersang_deLogIn(unsigned char* data, unsigned int* pdwRoundKey)
{
	unsigned char rawkey[16] = "gersang87654321";   //加密B的固定密钥
	int i;

	for (i=0; i<48; i++)                            //加密B
	{
		data[3+i] ^= rawkey[i%15];
	}

	SeedDecrypt(data+3, pdwRoundKey);               //加密A (SEED)
}



int main(void)
{

	unsigned char data[]=
"\x33\x00"                                                            //包总长度
"\x3C"                                                                //校验字节
"\x7C\x43\xBA\xDE\x5E\xC8\x37\x4B\x82\x12\x1B\xD7\x46\xBD\xA9\x97"    //加密A,加密B
"\x65\x72\x73\x61\x6E\x67\x38\x37\x36\x45\x5D\x54\x42\x58\x00\x65"    //加密B
"\x72\x73\x61\x6E\x67\x38\x37\x36\x35\x34\x33\x32\x31\x67\x65\x72";   //加密B

	unsigned char RoundKey[]=
"\xD7\x90\xC1\xD8\xB1\x45\xDE\x5F\xE2\x8D\xF5\x7D\xB6\x73\xEB\x07"    //加密A (SEED)子密钥
"\x32\x6E\x7F\xFA\xA2\x29\x94\xD8\x55\xA4\xF4\x51\x2E\x5C\x52\xC9"
"\xC3\x97\xF6\x91\x2E\xF5\x23\xF8\x0B\xFF\x98\x1A\xD9\x5F\x64\x99"
"\x89\x52\xC7\xDE\xA8\x14\x71\x75\xDC\xDF\x6C\x55\xE9\xC2\x50\xAD"
"\xF7\x96\x71\xC4\x18\xFA\x4F\xB6\xEC\x2D\xED\x1A\xF1\xE0\x77\x8A"
"\x03\x89\xC7\x50\xE7\x99\x2C\xB9\xA1\xA6\x12\x1D\x43\x4A\x49\xEB"
"\xD9\x87\x63\xBE\x51\x34\x76\x6B\x35\xDF\x88\xB8\x78\xED\x6A\xCC"
"\x44\x2A\xC8\xA5\x76\x16\xC4\xE5\xF4\x6F\x40\xD5\x8E\x9D\x69\x20";

	int i;

	gersang_deLogIn(data, (unsigned int*) RoundKey);

	for (i=0; i<51; i++)
	{
		printf("%02X ", data[i]);
	}
	printf("\n\n");
	for (i=0; i<51; i++)
	{
		printf("%c", data[i]);
	}
	printf("\n");

	return 0;
}