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rkcrc.py
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#!/usr/bin/python
#
#
# FreakTabKitchen www.freaktab.com
#
# Copyright 2013 Brian Mahoney [email protected]
#
# <version>2.0.1</version>
#
############################################################################
#
# FreakTabKitchen is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FreakTabKitchen is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with FreakTabKitchen. If not, see <http://www.gnu.org/licenses/>.
#
#############################################################################
# This module is a python reworking of FUKAUMI Naoki rkunpack
#############################################################################
# * Copyright (c) 2010, 2011 FUKAUMI Naoki.
# * All rights reserved.
# *
# * Redistribution and use in source and binary forms, with or without
# * modification, are permitted provided that the following conditions
# * are met:
# * 1. Redistributions of source code must retain the above copyright
# * notice, this list of conditions and the following disclaimer.
# * 2. Redistributions in binary form must reproduce the above copyright
# * notice, this list of conditions and the following disclaimer in the
# * documentation and/or other materials provided with the distribution.
# *
# * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# */
#############################################################################
import sys
import os
import math
import argparse
table = [0x00000000, 0x04c10db7, 0x09821b6e, 0x0d4316d9,
0x130436dc, 0x17c53b6b, 0x1a862db2, 0x1e472005,
0x26086db8, 0x22c9600f, 0x2f8a76d6, 0x2b4b7b61,
0x350c5b64, 0x31cd56d3, 0x3c8e400a, 0x384f4dbd,
0x4c10db70, 0x48d1d6c7, 0x4592c01e, 0x4153cda9,
0x5f14edac, 0x5bd5e01b, 0x5696f6c2, 0x5257fb75,
0x6a18b6c8, 0x6ed9bb7f, 0x639aada6, 0x675ba011,
0x791c8014, 0x7ddd8da3, 0x709e9b7a, 0x745f96cd,
0x9821b6e0, 0x9ce0bb57, 0x91a3ad8e, 0x9562a039,
0x8b25803c, 0x8fe48d8b, 0x82a79b52, 0x866696e5,
0xbe29db58, 0xbae8d6ef, 0xb7abc036, 0xb36acd81,
0xad2ded84, 0xa9ece033, 0xa4aff6ea, 0xa06efb5d,
0xd4316d90, 0xd0f06027, 0xddb376fe, 0xd9727b49,
0xc7355b4c, 0xc3f456fb, 0xceb74022, 0xca764d95,
0xf2390028, 0xf6f80d9f, 0xfbbb1b46, 0xff7a16f1,
0xe13d36f4, 0xe5fc3b43, 0xe8bf2d9a, 0xec7e202d,
0x34826077, 0x30436dc0, 0x3d007b19, 0x39c176ae,
0x278656ab, 0x23475b1c, 0x2e044dc5, 0x2ac54072,
0x128a0dcf, 0x164b0078, 0x1b0816a1, 0x1fc91b16,
0x018e3b13, 0x054f36a4, 0x080c207d, 0x0ccd2dca,
0x7892bb07, 0x7c53b6b0, 0x7110a069, 0x75d1adde,
0x6b968ddb, 0x6f57806c, 0x621496b5, 0x66d59b02,
0x5e9ad6bf, 0x5a5bdb08, 0x5718cdd1, 0x53d9c066,
0x4d9ee063, 0x495fedd4, 0x441cfb0d, 0x40ddf6ba,
0xaca3d697, 0xa862db20, 0xa521cdf9, 0xa1e0c04e,
0xbfa7e04b, 0xbb66edfc, 0xb625fb25, 0xb2e4f692,
0x8aabbb2f, 0x8e6ab698, 0x8329a041, 0x87e8adf6,
0x99af8df3, 0x9d6e8044, 0x902d969d, 0x94ec9b2a,
0xe0b30de7, 0xe4720050, 0xe9311689, 0xedf01b3e,
0xf3b73b3b, 0xf776368c, 0xfa352055, 0xfef42de2,
0xc6bb605f, 0xc27a6de8, 0xcf397b31, 0xcbf87686,
0xd5bf5683, 0xd17e5b34, 0xdc3d4ded, 0xd8fc405a,
0x6904c0ee, 0x6dc5cd59, 0x6086db80, 0x6447d637,
0x7a00f632, 0x7ec1fb85, 0x7382ed5c, 0x7743e0eb,
0x4f0cad56, 0x4bcda0e1, 0x468eb638, 0x424fbb8f,
0x5c089b8a, 0x58c9963d, 0x558a80e4, 0x514b8d53,
0x25141b9e, 0x21d51629, 0x2c9600f0, 0x28570d47,
0x36102d42, 0x32d120f5, 0x3f92362c, 0x3b533b9b,
0x031c7626, 0x07dd7b91, 0x0a9e6d48, 0x0e5f60ff,
0x101840fa, 0x14d94d4d, 0x199a5b94, 0x1d5b5623,
0xf125760e, 0xf5e47bb9, 0xf8a76d60, 0xfc6660d7,
0xe22140d2, 0xe6e04d65, 0xeba35bbc, 0xef62560b,
0xd72d1bb6, 0xd3ec1601, 0xdeaf00d8, 0xda6e0d6f,
0xc4292d6a, 0xc0e820dd, 0xcdab3604, 0xc96a3bb3,
0xbd35ad7e, 0xb9f4a0c9, 0xb4b7b610, 0xb076bba7,
0xae319ba2, 0xaaf09615, 0xa7b380cc, 0xa3728d7b,
0x9b3dc0c6, 0x9ffccd71, 0x92bfdba8, 0x967ed61f,
0x8839f61a, 0x8cf8fbad, 0x81bbed74, 0x857ae0c3,
0x5d86a099, 0x5947ad2e, 0x5404bbf7, 0x50c5b640,
0x4e829645, 0x4a439bf2, 0x47008d2b, 0x43c1809c,
0x7b8ecd21, 0x7f4fc096, 0x720cd64f, 0x76cddbf8,
0x688afbfd, 0x6c4bf64a, 0x6108e093, 0x65c9ed24,
0x11967be9, 0x1557765e, 0x18146087, 0x1cd56d30,
0x02924d35, 0x06534082, 0x0b10565b, 0x0fd15bec,
0x379e1651, 0x335f1be6, 0x3e1c0d3f, 0x3add0088,
0x249a208d, 0x205b2d3a, 0x2d183be3, 0x29d93654,
0xc5a71679, 0xc1661bce, 0xcc250d17, 0xc8e400a0,
0xd6a320a5, 0xd2622d12, 0xdf213bcb, 0xdbe0367c,
0xe3af7bc1, 0xe76e7676, 0xea2d60af, 0xeeec6d18,
0xf0ab4d1d, 0xf46a40aa, 0xf9295673, 0xfde85bc4,
0x89b7cd09, 0x8d76c0be, 0x8035d667, 0x84f4dbd0,
0x9ab3fbd5, 0x9e72f662, 0x9331e0bb, 0x97f0ed0c,
0xafbfa0b1, 0xab7ead06, 0xa63dbbdf, 0xa2fcb668,
0xbcbb966d, 0xb87a9bda, 0xb5398d03, 0xb1f880b4]
def pycrc(crc, buf):
'''calculate the crc for buf
'''
i=0
while i < len(buf):
crcl = (crc << 8) & 0xffffffff
crcr = (crc >> 24) & 0xffffffff
val = table[(crcr ^ ord(buf[i]))]# & 0xff]
crc = crcl ^ val
crc = crc #& 0xffffffff
i = i + 1
return crc
def hexencode(i):
'''encode the integer i as a 4 byte string least significant byte first
'''
hsize = hex(i)[2:]
prefix = ''
if len(hsize) <8:
hsize = '0'*(8-len(hsize)) + hsize
while len(hsize) > 0:
buf=hsize[-2:]
prefix = prefix + chr(int(buf,16))
hsize = hsize[:-2]
return prefix
def rkcrc(flags,infile,outfile):
'''rkcrc [-k|-p] source destination (output a signed copy of the image based on the flag)
-k KRNL prefix
-p PARM prefix
output will be
optional prefix (KRNL|PARM)
original image size
original image
4 byte crc'''
tbufflen = 256
offset = 0
prefix =''
switch = 0
if flags[:1] == '-':
flag = flags[1:]
if flag in('p','P'):
prefix='PARM'
elif flag in('k','K'):
prefix='KRNL'
#infile = sys.argv[1 + switch]
#outfile = sys.argv[2 + switch]
size = os.stat(infile).st_size
prefix =prefix + hexencode(size)
with open(infile,'r') as f:
inbuff = f.read()
klen = len(inbuff)
crc = 0
while offset < klen:
crc = pycrc(crc,inbuff[offset:tbufflen + offset ])
offset = offset + tbufflen
with open(outfile,'w') as fw:
fw.write(prefix + inbuff + hexencode(crc))
if __name__ == "__main__":
#parse aregs
#optional k or p
#required source and destination
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument('-k',help='sign as KRNL',action='store_true')
group.add_argument('-p',help='sign as PARM',action='store_true')
parser.add_argument('source')
parser.add_argument('destination')
args=parser.parse_args()
if args.p:
sys.exit(rkcrc('-p',args.source,args.destination))
elif args.k:
sys.exit(rkcrc('-k',args.source,args.destination))
else:
sys.exit(rkcrc('',args.source,args.destination))