Code:
#include <stdio.h>
#include <string.h>
#include <windows.h>
char *enteredLogin = "coldfire";
#define BUFF_SIZE 0x48
#define SERIAL_SIZE 0x20
#define ENCRYPTED_SERIAL_SIZE (SERIAL_SIZE / 2)
unsigned char encryptedSerial[ENCRYPTED_SERIAL_SIZE];
unsigned char buff[BUFF_SIZE];
unsigned char buff403080[] = {
0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA,
0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16, 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12,
0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A,
0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03,
0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6,
0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6, 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1,
0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02,
0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26,
0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52,
0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA, 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A,
0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39,
0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
};
void init() {
int enteredLoginLen = strlen(enteredLogin);
memset(buff, 0, BUFF_SIZE);
memset(buff + 0x44, enteredLoginLen, 1);
memcpy(buff + 0x10, enteredLogin, enteredLoginLen);
memset(buff + 0x10 + enteredLoginLen, (0x10 - enteredLoginLen) & 0xFF, (0x10 - enteredLoginLen) & 0xFF);
}
void f(unsigned int off1, unsigned int off2, unsigned res_off) {
unsigned char tmp[4];
unsigned char tmp1[4];
memcpy(tmp, buff + off1, 4);
memcpy(tmp1, buff + off2, 4);
int i;
for(i = 0; i < 4; i++){
tmp[i] ^= tmp1[i];
}
memcpy(buff + res_off, tmp, 4);
}
// need to add to off's - i....
void f1(unsigned int off1, unsigned int off2, unsigned char *byte) {
// byte - edx; i - edi
// unsigned char debug_byte;
unsigned char tmp_byte_1; // ecx
unsigned char tmp_byte_2; // eax
tmp_byte_1 = *(buff + off1);
tmp_byte_2 = *(buff + off2);
(*byte) ^= tmp_byte_1;
// debug_byte = *(buff403080 + *byte);
tmp_byte_2 ^= *(buff403080 + *byte);
*(buff + off2) = tmp_byte_2;
*byte = tmp_byte_2;
}
// need to add to off's - i....
void f2(unsigned int off, unsigned char *byte) {
unsigned char tmp_byte_2 = *(buff + off); // ebx
*byte = *(buff403080 + *byte);
*byte ^= tmp_byte_2;
*(buff + off) = *byte;
}
void cryptBuffer() {
f(0x10, 0, 0x20);
f(0x14, 0x4, 0x24);
f(0x18, 0x8, 0x28);
f(0x1c, 0xC, 0x2c);
unsigned char byte = *(buff + 0x3f); // edx
int i = -24; // edi
do {
f1(i + 0x28, i + 0x48, &byte);
f1(i + 0x29, i + 0x49, &byte);
f1(i + 0x2a, i + 0x4a, &byte);
f1(i + 0x2b, i + 0x4b, &byte);
i += 4;
} while(i);
byte = 0;
i = -48;
unsigned char j = 0;
do {
do {
f2(i + 0x30, &byte);
f2(i + 0x31, &byte);
f2(i + 0x32, &byte);
f2(i + 0x33, &byte);
i += 4;
} while(i);
byte += j;
j++;
byte &= 0xff; // there is no any sense...
i = -48;
} while(j != 18);
}
void f_00401bf4() {
cryptBuffer();
memcpy(buff + 0x10, buff + 0x30, 0x10);
cryptBuffer();
}
void f_00401620(int addr) {
signed int i;
int byte;
i = -1;
do
{
++i;
byte = *(BYTE *)(i + addr);
*(BYTE *)(i + encryptedSerial) = byte;
} while ( byte );
}
int main(void)
{
init();
f_00401bf4();
typedef int (__stdcall *calcfunc)(DWORD);
HMODULE lib = LoadLibraryA("keygenme.dat");
if (!lib) {
printf("lib not loaded\n");
return 1;
}
calcfunc calc = (calcfunc) GetProcAddress(lib, "calc");
if (!calc) {
printf("func address bad...\n");
return 1;
}
DWORD addr = (DWORD)(&buff[0]);
calc(addr);
__asm {
mov addr, esi
}
f_00401620(addr);
FreeLibrary(lib);
// translate encrypted buffer to string...
char serial[SERIAL_SIZE];
unsigned int i;
for (i = 0; i < ENCRYPTED_SERIAL_SIZE; i++) {
char currByte = encryptedSerial[i];
char tmp;
tmp = ((currByte & 0xF0) >> 4) + 55;
tmp -= (tmp < 0x40 ? 7 : 0);
serial[2 * i] = tmp;
tmp = (currByte & 0x0F) + 55;
tmp -= (tmp < 0x40 ? 7 : 0);
serial[2 * i + 1] = tmp;
}
for (i = 0; i < SERIAL_SIZE; i++) {
printf("%c", serial[i]);
}
printf("\n");
system("PAUSE");
return 0;
}
На этом все! Спасибо за внимание! Если у кого есть еще какие-то вопросы, то пишем сюда буду пробовать отвечать ;)
Решения Easy Crackme
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Thanks
Originally Posted by ARCHANGEL
