void x_reverse_map(PBYTE buf_map_rev, PBYTE buf_map, int len)
{
int i;
for (int i = 0; i < len; i++)
{
buf_map_rev[buf_map[i]] = (BYTE)i;
}
}
void x_b16_decode(PBYTE buf, int len, PBYTE sz_map16_rev)
{
for (int i = 0; i < len; i++)
{
BYTE c1 = buf[2*i];
BYTE c2 = buf[2*i+1];
buf[i] = 0;
buf[i] |= sz_map16_rev[c1] << 4;
buf[i] |= sz_map16_rev[c2];
}
}
void x_b256_decode(PBYTE buf, int len, PBYTE sz_map256_rev)
{
for (int i = 0; i < len; i++)
{
buf[i] = sz_map256_rev[buf[i]];
}
}
void x_rotate_right(PBYTE buf, int len)
{
BYTE c = buf[len - 1];
for (int i = len - 1; i > 0; i--)
{
buf[i] = buf[i-1];
}
buf[0] = c;
}
void x_xor(PBYTE buf, int len, DWORD key)
{
PBYTE pk = (PBYTE)&key;
for (int i = 0; i < len; i++)
{
buf[i] ^= pk[i % 4];
}
}
void x_swap_high_low(PBYTE buf, int len)
{
for (int i = 0; i < len; i++)
{
buf[i] = ((buf[i] & 0x0F) << 4) | (buf[i] >> 4);
}
}
void x_swap_nearby(PBYTE buf, int len)
{
for (int i = 0; i < len; i+=2)
{
BYTE c = buf[i];
buf[i] = buf[i+1];
buf[i+1] = c;
}
}
void test()
{
BYTE sz_map256[256] =
{
0x40, 0x50, 0x78, 0x7A, 0x29, 0x88, 0xF7, 0x06, 0x21, 0x09, 0xF3, 0x5C, 0x95, 0xAE, 0x66, 0x12,
0x8F, 0x85, 0xC8, 0x5A, 0xBF, 0x33, 0x3D, 0x86, 0x90, 0x8C, 0xED, 0xD5, 0x8B, 0xA4, 0xC5, 0xC7,
0xEA, 0xF6, 0x79, 0x1E, 0x3C, 0xBA, 0x97, 0x4E, 0x38, 0x60, 0x08, 0xDD, 0xFA, 0xB3, 0xDE, 0x77,
0x81, 0x41, 0x19, 0xF4, 0x52, 0x6B, 0xFF, 0xD8, 0x2A, 0xC2, 0xBC, 0xB9, 0xE7, 0x91, 0xE9, 0x54,
0x82, 0xAD, 0x7E, 0x11, 0x35, 0x93, 0xB0, 0xA1, 0x18, 0xC4, 0x53, 0x0A, 0x74, 0x2F, 0xE2, 0x17,
0x98, 0x0C, 0x70, 0x92, 0x47, 0x64, 0x16, 0xFE, 0x75, 0x83, 0x37, 0x8D, 0x07, 0x72, 0x25, 0x04,
0xB7, 0xC9, 0xCE, 0x0E, 0x9E, 0xEB, 0xCF, 0xB1, 0xDB, 0x71, 0x56, 0xAF, 0x39, 0xF0, 0xBB, 0xBD,
0x46, 0x32, 0xE6, 0x9F, 0x4F, 0x1B, 0x4D, 0x68, 0xF2, 0x4B, 0x2E, 0xCB, 0x20, 0xD2, 0x0B, 0xA5,
0xEE, 0xE1, 0xA9, 0x2B, 0x84, 0x14, 0x67, 0x63, 0x6F, 0x3E, 0x7F, 0xFD, 0xB6, 0xFC, 0x55, 0x7C,
0x5F, 0xF8, 0x4C, 0x65, 0x2C, 0x30, 0xEF, 0x48, 0xD7, 0x0D, 0x0F, 0x1A, 0x5E, 0xC0, 0x3A, 0x57,
0x6A, 0x31, 0x00, 0xF1, 0x59, 0x10, 0xB8, 0x9A, 0x43, 0x73, 0xA3, 0x6E, 0x26, 0x1D, 0x13, 0x15,
0x89, 0x5D, 0xDA, 0x61, 0xD1, 0x6C, 0xD3, 0xE0, 0xD9, 0x1F, 0xD4, 0x49, 0xEC, 0xE3, 0xD0, 0x34,
0x36, 0xC6, 0x24, 0xE4, 0xF5, 0xAA, 0x9B, 0xB2, 0x4A, 0xDF, 0xAC, 0x96, 0xDC, 0xE8, 0xA0, 0xF9,
0xC1, 0x9C, 0xCA, 0x9D, 0x27, 0xC3, 0xBE, 0x87, 0x28, 0xCC, 0x99, 0xE5, 0x45, 0x58, 0x94, 0x23,
0x22, 0xFB, 0x02, 0x01, 0x03, 0x8A, 0x7B, 0xB5, 0x1C, 0xA7, 0x44, 0xCD, 0xA2, 0x51, 0x8E, 0x3F,
0x42, 0xD6, 0x69, 0xAB, 0x62, 0x3B, 0x7D, 0xA6, 0x05, 0x2D, 0xA8, 0x80, 0x6D, 0xB4, 0x76, 0x5B
};
BYTE sz_map256_rev[256] = {0};
char sz_map16[] = "A3Cw6Gb0OZWPU52s";
BYTE sz_map16_rev[256] = {0};
int i;
x_reverse_map(sz_map256_rev, sz_map256, 256);
x_reverse_map(sz_map16_rev, (PBYTE)sz_map16, 16);
char sz_expected[] = "3ww3U53wOAWG333wwPZ56GGw0PO02OUW";
DWORD key = 0x2333AE83;
BYTE buf[256];
ZeroMemory(buf, sizeof(buf));
int len = strlen(sz_expected)/2;
for (i = 0; i < len; i++)
{
buf[2*i] = sz_expected[i];
buf[2*i+1] = sz_expected[len*2-1-i];
}
x_b16_decode(buf, len, sz_map16_rev);
x_rotate_right(buf, len);
x_b256_decode(buf, len, sz_map256_rev);
x_swap_nearby(buf, len);
x_xor(buf, len, key);
x_swap_high_low(buf, len);
x_b256_decode(buf, len, sz_map256_rev);
x_rotate_right(buf, len);
buf[len] = 0;
printf("%s\n", buf);
}
