[RELEASE] .pak file opener

xqtm · 2011-03-30T11:45:59.000Z

For those who needs it, this is the .pak file opener. when this will ask for a decompression script, select Cysis2.bms http://img846.imageshack.us/img846/589/decompress.png VirusTotal - Free Online Virus, Malware and URL Scanner (http://www.virustotal.com/file-scan/report.html?id=f3068c98852c9c067d1d9bf7292c88d470921663ebe2fe93701989a77d312a03-1301486377)

Cyrisis2.bms, is inside of the rar file

Code:

quickbmsver 0.4.10b # correct reimporting granted from this version
getdstring SIGN 2
if SIGN == "PK"
    print "the input file is already decrypted, open it normally as a ZIP"
    cleanexit
endif

get NIGEL_SIZE asize
math i = 0
do
    goto -10
    get PKSIZE long
    get OFFSET long
    if i == 0
        set CRYSIS2_KEY binary "\xc9\x68\xfb\x67\x8f\x9b\x42\x67\x85\x39\x9e\x84\xf9\xb9\x9d\xc4"   # retail
    elif i == 1
        set CRYSIS2_KEY binary "\xf3\x85\x0a\x96\xb7\x4a\xbe\x07\x12\x60\x4a\x4d\xe8\x03\xa1\x16"   # mpdemo
    else
        print "no valid key found, contact me!"
        cleanexit
    endif
    math i += 1
    encryption xxtea CRYSIS2_KEY "" 0 16
    log MEMORY_FILE OFFSET PKSIZE
    encryption "" ""
    get PK_sign long MEMORY_FILE
while PK_sign != 0x02014b50

goto 0 MEMORY_FILE
ComType deflate
for PKOFF = 0 < PKSIZE
    get PK_sign short MEMORY_FILE
    get sign short MEMORY_FILE
        get ver_made        short MEMORY_FILE
        get ver_need        short MEMORY_FILE
        get flag            short MEMORY_FILE
        get method          short MEMORY_FILE
        get modtime         short MEMORY_FILE
        get moddate         short MEMORY_FILE
        get crc             long MEMORY_FILE
        get comp_size       long MEMORY_FILE
        get uncomp_size     long MEMORY_FILE
        get name_len        short MEMORY_FILE
        get extra_len       short MEMORY_FILE
        get comm_len        short MEMORY_FILE
        get disknum         short MEMORY_FILE
        get int_attr        short MEMORY_FILE
        get ext_attr        long MEMORY_FILE
        get rel_offset      long MEMORY_FILE
        getdstring name     name_len MEMORY_FILE
        getdstring extra    extra_len MEMORY_FILE
        getdstring comment  comm_len MEMORY_FILE
    savepos PKOFF MEMORY_FILE

    math offset = rel_offset
    math offset += name_len
    math offset += 0x1e

    if uncomp_size == 0
        set method long 0
    endif

    if method == 0
        Log name offset uncomp_size
    elif method == 8
        CLog name offset comp_size uncomp_size
    elif method == 11
        encryption xxtea CRYSIS2_KEY "" 0 16
        CLog name offset comp_size uncomp_size
        encryption "" ""
    else
        print "unsupported compression method %method% at offset %PKOFF%, contact me!"
        cleanexit
    endif
next

[RELEASE] .pak file opener

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