(PSP) Monster Hunter Freedom Unite DATA.BIN extract

[BadhornStadnent]

I need some help with extracting DATA.BIN from monster hunter freedom unite (PSP), I've tried other ways but just wasn't successful.

Something that could help would be appreciated.

[aluigi]

Please provide DATA.BIN.
If it's very big you can upload the 2 files generated with this script:
http://aluigi.org/bms/filecutter.bms

[BadhornStadnent]

Sure, here is it is.

http://puu.sh/qmzby.zip

[aluigi]

Completely encrypted. Can't help.

[Ekey]

*Edited*

Seems it's :
https://github.com/codestation/mhtools/ ... ypter.java
https://github.com/codestation/mhtools/ ... aKeys.java

and
https://github.com/svanheulen/mhef/blob ... hef/psp.py

=======================

Code: Select all

void fun_884ea1c(struct s0* Buffer, int32_t Size) {
    struct s0* s4_6;
    unsigned char* s3_7;
    unsigned char* s2_8;
    unsigned char* s1_9;
    int32_t i;
    uint32_t v0_11;
    int32_t Secret = 0;

    s4_6 = Buffer;
    s3_7 = &Buffer->f1;
    s2_8 = &Buffer->f2;
    s1_9 = &Buffer->f3;
    if (Size > 0) {
        i = 0;
        while (1) {
            s4_6->f0 = static_cast<unsigned char>(static_cast<uint32_t>(*reinterpret_cast<unsigned char*>(m_Key + s4_6->f0)));
            *s3_7 = static_cast<unsigned char>(static_cast<uint32_t>(*reinterpret_cast<unsigned char*>(m_Key + *s3_7)));
            *s2_8 = static_cast<unsigned char>(static_cast<uint32_t>(*reinterpret_cast<unsigned char*>(m_Key + *s2_8)));
            *s1_9 = static_cast<unsigned char>(static_cast<uint32_t>(*reinterpret_cast<unsigned char*>(m_Key + *s1_9)));
            v0_11 = fun_884ecac(Secret);
            i = i + 4;
            s3_7 = s3_7 + 4;
            s4_6->f0 = reinterpret_cast<unsigned char>(s4_6->f0 ^ v0_11);
            s2_8 = s2_8 + 4;
            ++s4_6;
            if (i >= Size) 
                break;
            s1_9 = s1_9 + 4;
        }
    }
    return;
}

=======================

Converted

Code: Select all

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

int dwKey1 = 0x00007F8D;
int dwKey2 = 0x00002345;

void set_key(int dwOffset)
{
   dwKey1 = dwOffset & 0xFFFF;
   if(dwKey1 == 0)
      dwKey1 = 0x7F8D;

   dwKey2 = dwOffset >> 16;
   if(dwKey2 == 0)
      dwKey2 = 0x2345;
}

int xor_by_key(void)
{
   dwKey1 = (dwKey1 * 0x7F8D) % 0xFFF1;
   dwKey2 = (dwKey2 * 0x2345) % 0xFFD9;
   return dwKey1 + (dwKey2 << 16);
}

void iDecrypt(unsigned char *pBuffer, int dwSize)
{
   for(int i = 0; i < dwSize; i += 4){
      pBuffer[0] = m_Encrypted_Table[pBuffer[0]];
      pBuffer[1] = m_Encrypted_Table[pBuffer[1]];
      pBuffer[2] = m_Encrypted_Table[pBuffer[2]];
      pBuffer[3] = m_Encrypted_Table[pBuffer[3]];
      *(int*)pBuffer ^= xor_by_key();
      pBuffer += 4;
   }
}

All data's crypted by offset

[aluigi]

I see the header till 0x8170 but then?

Code: Select all

set MEMORY_FILE3 compressed "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"

savepos OFFSET
get SIZE asize
math SIZE - OFFSET
encryption calldll "MEMORY_FILE3 0 cdecl RET OFFSET #INPUT# #INPUT_SIZE#"
log "test.dat" OFFSET SIZE

Curiosity: MEMORY_FILE3 is a just function containing the code posted by Ekey with m_Encrypted_Table generated at runtime to avoid non-stack buffers and calling "set_key(offset); iDecrypt(data, datasz);"

[Ekey]

I see the header till 0x8170 but then?

Yeah, it's index table.

based of python code we need read 4 bytes, decrypt it, result value * 2048 = index table size > 0x8800. I tryed and in index table last 0x690 bytes is invalid, just junk.

Code: Select all

def decrypt_file(self, data_file, out_file):
        """
        Save a decrypted copy of the given DATA.BIN file.
        Arguments:
        data_file -- Path to an encrypted DATA.BIN file
        out_file -- Path to save the decrypted DATA.BIN file
        """
        with open(data_file, 'rb') as data, open(out_file, 'wb') as out:
            # Decrypt the block address of the first file to determine the size
            # of the table of contents
            toc_size = self.decrypt(data.read(4), 0)
            toc_size = array.array('I', toc_size)[0] * 2048
            file_size = data.seek(0, os.SEEK_END)
            data.seek(0)
            # Decrypt the table of contents
            toc = self.decrypt(data.read(toc_size), 0)
            out.write(toc)
            toc = array.array('I', toc)
            # Find the number of files by getting the index of the table of
            # contents entry pointing to the end of the file
            file_count = toc.index(file_size // 2048)
            # Decrypt each file in the data file
            for i in range(file_count):
                data.seek(toc[i] * 2048)
                out.seek(toc[i] * 2048)
                buff = data.read((toc[i+1] - toc[i]) * 2048)
                # Skip decryption of certain files
                if i in self._exceptions:
                    out.write(buff)
                else:
                    out.write(self.decrypt(buff, toc[i]))

* Edited 2 *

From bin loader - decrypting two times:

First - with size 0x6808
Second - with size 0x1968

Code: Select all

li      $a2, 0x6808
jal     VFS_DECRYPT

Code: Select all

li      $a2, 0x1968
jal     VFS_DECRYPT

0x6808 + 0x1968 = 0x8170

Looks like there is two tables