129 lines
3.4 KiB
Python
Executable File
129 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python2
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# Copyright (c) 2014 Google Inc. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import struct
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import sys
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from io import SEEK_SET, SEEK_END
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class IDBTool:
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def __init__(self):
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print "Initialize IDBTool"
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def p_rc4(self, buf, length):
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key = (124,78,3,4,85,5,9,7,45,44,123,56,23,13,23,17)
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K = key * 16
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S = [i for i in range(256)]
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j = 0
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for i in range(256):
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j = (j + S[i] + K[i]) % 256
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temp = S[i]; S[i] = S[j]; S[j] = temp;
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i = j = k = 0
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for x in range(length):
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i = (i+1) % 256
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j = (j + S[i]) % 256
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temp = S[i]; S[i] = S[j]; S[j] = temp
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k = (S[i] + S[j]) % 256
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buf[x] = struct.pack('B', ord(buf[x]) ^ S[k])
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def makeIDB(self, chip, from_file, to_file, rc4_flag = False, align_flag = False):
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try:
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fin = open(from_file, 'rb')
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except:
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sys.exit("Failed to open file : " + from_file)
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try:
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fin.seek(0, SEEK_END)
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if (fin.tell() > 4 * 1024 * 1024):
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sys.exit("Input file is more than 4MB")
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fin.seek(0)
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data = fin.read()
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finally:
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fin.close()
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data_len = len(data)
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SECTOR_SIZE = 512
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PAGE_ALIGN = 4
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sectors = (data_len + 4 - 1) / SECTOR_SIZE + 1
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pages = (sectors - 1) / PAGE_ALIGN + 1
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sectors = pages * PAGE_ALIGN;
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buf = [B'\0'] * sectors * SECTOR_SIZE
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buf[:4] = chip
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buf[4 : 4+data_len] = data
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idblock = [B'\0'] * 4 * SECTOR_SIZE
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blank = [B'\0'] * 4 * SECTOR_SIZE
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idblock[:4] = ['\x55', '\xAA', '\xF0', '\x0F']
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if (not rc4_flag):
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idblock[8:12] = struct.pack("<I", 1)
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else:
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for i in range(sectors):
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list_tmp = buf[SECTOR_SIZE*i : SECTOR_SIZE*(i+1)]
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self.p_rc4(list_tmp, SECTOR_SIZE)
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buf[SECTOR_SIZE*i : SECTOR_SIZE*(i+1)] = list_tmp
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idblock[12:16] = struct.pack("<HH", 4, 4);
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idblock[506:510] = struct.pack("<HH", sectors, sectors);
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self.p_rc4(idblock, SECTOR_SIZE)
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try:
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fout = open(to_file, "wb+")
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except:
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sys.exit("Failed to open output file : " + to_file)
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try:
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if (align_flag):
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fout.write(''.join(idblock))
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fout.write(''.join(blank))
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for s in xrange(0, sectors * SECTOR_SIZE, PAGE_ALIGN * SECTOR_SIZE):
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fout.write(''.join(buf[s : s + PAGE_ALIGN * SECTOR_SIZE]))
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fout.write(''.join(blank))
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else:
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fout.write(''.join(idblock))
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fout.write(''.join(buf))
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fout.flush()
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except:
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sys.exit("Failed to write data to : " + to_file)
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finally:
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fout.close()
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print "DONE"
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def usage():
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print "Usage: make_idb.py [--chip=RKXX] [--enable-rc4] [--enable-align] [--to=out] --from=in"
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print " --chip: default is RK32"
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if __name__ == '__main__':
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rc4_flag = align_flag = False
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to_file = "IDBlock.bin"
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chip = "RK32"
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for para in sys.argv[1:]:
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if (para == "--enable-rc4"):
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rc4_flag = True
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elif (para == "--enable-align"):
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align_flag = True
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elif (para.startswith("--to=")):
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to_file = para.split('=')[1]
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elif (para.startswith("--from=")):
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from_file = para.split('=')[1]
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elif (para.startswith("--chip=")):
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chip = para.split('=')[1]
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elif (para == "--help" or para == "-h"):
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usage()
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sys.exit()
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else:
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usage()
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sys.exit()
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if ('from_file' not in vars() or to_file == ''):
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usage()
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sys.exit()
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idbtool = IDBTool()
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idbtool.makeIDB(chip, from_file, to_file, rc4_flag, align_flag)
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