checksum.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 '''
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the Revised BSD License.
   7
   8     This program is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11     Revised BSD License for more details.
  12
  13     Copyright 2018-2024 Cool Dude 2k - http://idb.berlios.de/
  14     Copyright 2018-2024 Game Maker 2k - http://intdb.sourceforge.net/
  15     Copyright 2018-2024 Kazuki Przyborowski - https://github.com/KazukiPrzyborowski
  16
  17     $FileInfo: checksum.py - Last Update: 4/29/2024 Ver. 0.9.0 RC 1 - Author: cooldude2k $
  18 '''
  19
  20 from __future__ import absolute_import, division, print_function, unicode_literals;
  21 import os, binascii, argparse, shutil, hashlib, zlib;
  22 from io import open as open;
  23
  24 hashlib_guaranteed = False;
  25 chksum_list = sorted(['adler32', 'crc16', 'crc16_ansi', 'crc16_ibm', 'crc16_ccitt', 'crc32', 'crc64', 'crc64_ecma', 'crc64_iso']);
  26 if(hashlib_guaranteed):
  27  chksum_list_hash = sorted(list(hashlib.algorithms_guaranteed));
  28 else:
  29  chksum_list_hash = sorted(list(hashlib.algorithms_available));
  30
  31 # initial_value can be 0xFFFF or 0x0000
  32 def crc16_ansi(msg, initial_value=0xFFFF):
  33  # CRC-16-IBM / CRC-16-ANSI polynomial and initial value
  34  poly = 0x8005;  # Polynomial for CRC-16-IBM / CRC-16-ANSI
  35  crc = initial_value;  # Initial value
  36  for b in msg:
  37   crc ^= b << 8;  # XOR byte into CRC top byte
  38   for _ in range(8):  # Process each bit
  39    if crc & 0x8000:  # If the top bit is set
  40     crc = (crc << 1) ^ poly;  # Shift left and XOR with the polynomial
  41    else:
  42     crc = crc << 1;  # Just shift left
  43    crc &= 0xFFFF;  # Ensure CRC remains 16-bit
  44  return crc;
  45
  46 # initial_value can be 0xFFFF or 0x0000
  47 def crc16_ibm(msg, initial_value=0xFFFF):
  48  return crc16_ansi(msg, initial_value);
  49
  50 # initial_value is 0xFFFF
  51 def crc16(msg):
  52  return crc16_ansi(msg, 0xFFFF);
  53
  54 # initial_value can be 0xFFFF, 0x1D0F or 0x0000
  55 def crc16_ccitt(msg, initial_value=0xFFFF):
  56  # CRC-16-CCITT polynomial
  57  poly = 0x1021;  # Polynomial for CRC-16-CCITT
  58  # Use the specified initial value
  59  crc = initial_value;
  60  for b in msg:
  61   crc ^= b << 8;  # XOR byte into CRC top byte
  62   for _ in range(8):  # Process each bit
  63    if crc & 0x8000:  # If the top bit is set
  64     crc = (crc << 1) ^ poly;  # Shift left and XOR with the polynomial
  65    else:
  66     crc = crc << 1;  # Just shift left
  67    crc &= 0xFFFF;  # Ensure CRC remains 16-bit
  68  return crc;
  69
  70 # initial_value can be 0x42F0E1EBA9EA3693 or 0x0000000000000000
  71 def crc64_ecma(msg, initial_value=0x0000000000000000):
  72  # CRC-64-ECMA polynomial and initial value
  73  poly = 0x42F0E1EBA9EA3693;
  74  crc = initial_value;  # Initial value for CRC-64-ECMA
  75  for b in msg:
  76   crc ^= b << 56;  # XOR byte into the most significant byte of the CRC
  77   for _ in range(8):  # Process each bit
  78    if crc & (1 << 63):  # Check if the leftmost (most significant) bit is set
  79     crc = (crc << 1) ^ poly;  # Shift left and XOR with poly if the MSB is 1
  80    else:
  81     crc <<= 1;  # Just shift left if the MSB is 0
  82    crc &= 0xFFFFFFFFFFFFFFFF;  # Ensure CRC remains 64-bit
  83  return crc;
  84
  85 # initial_value can be 0x000000000000001B or 0xFFFFFFFFFFFFFFFF
  86 def crc64_iso(msg, initial_value=0xFFFFFFFFFFFFFFFF):
  87  # CRC-64-ISO polynomial and initial value
  88  poly = 0x000000000000001B;
  89  crc = initial_value;  # Common initial value for CRC-64-ISO
  90  for b in msg:
  91   crc ^= b << 56;  # XOR byte into the most significant byte of the CRC
  92   for _ in range(8):  # Process each bit
  93    if crc & (1 << 63):  # Check if the leftmost (most significant) bit is set
  94     crc = (crc << 1) ^ poly;  # Shift left and XOR with poly if the MSB is 1
  95    else:
  96     crc <<= 1;  # Just shift left if the MSB is 0
  97    crc &= 0xFFFFFFFFFFFFFFFF;  # Ensure CRC remains 64-bit
  98  return crc;
  99
 100 def crc16_ansi_file(infile):
 101  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 102   return False;
 103  filefp = open(infile, "rb");
 104  checksum = format(crc16_ansi(filefp.read()) & 0xffff, '04x').lower();
 105  filefp.close();
 106  return checksum;
 107
 108 def crc16_ccitt_file(infile):
 109  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 110   return False;
 111  filefp = open(infile, "rb");
 112  checksum = format(crc16_ccitt(filefp.read()) & 0xffff, '04x').lower();
 113  filefp.close();
 114  return checksum;
 115
 116 def adler32_file(infile):
 117  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 118   return False;
 119  filefp = open(infile, "rb");
 120  checksum = format(zlib.adler32(filefp.read()) & 0xffffffff, '08x').lower();
 121  filefp.close();
 122  return checksum;
 123
 124 def crc32_file(infile):
 125  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 126   return False;
 127  filefp = open(infile, "rb");
 128  checksum = format(zlib.crc32(filefp.read()) & 0xffffffff, '08x').lower();
 129  filefp.close();
 130  return checksum;
 131
 132 def crc64_ecma_file(infile):
 133  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 134   return False;
 135  filefp = open(infile, "rb");
 136  checksum = format(crc64_ecma(filefp.read()) & 0xffffffffffffffff, '016x').lower();
 137  filefp.close();
 138  return checksum;
 139
 140 def crc64_iso_file(infile):
 141  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 142   return False;
 143  filefp = open(infile, "rb");
 144  checksum = format(crc64_iso(filefp.read()) & 0xffffffffffffffff, '016x').lower();
 145  filefp.close();
 146  return checksum;
 147
 148 def hash_file(infile, checksumtype):
 149  if(checksumtype not in chksum_list_hash):
 150   return False;
 151  if(not os.path.exists(infile) or not os.path.isfile(infile)):
 152   return False;
 153  filefp = open(infile, "rb");
 154  checksumoutstr = hashlib.new(checksumtype);
 155  checksumoutstr.update(filefp.read());
 156  checksum = checksumoutstr.hexdigest().lower();
 157  filefp.close();
 158  return checksum;
 159
 160 if __name__ == "__main__":
 161  argparser = argparse.ArgumentParser(description="Get File Checksum", conflict_handler="resolve", add_help=True);
 162  argparser.add_argument("-V", "--version", action="version", version="PyChecksum 0.0.1");
 163  argparser.add_argument("-i", "-f", "--input", help="Files to checksum", required=True);
 164  argparser.add_argument("-c", "-checksum", "--checksum", default="auto", help="Checksum to use", required=True);
 165  argparser.add_argument("-q", "--quiet", action="store_true", help="Print only checksum");
 166  getargs = argparser.parse_args();
 167  if(getargs.checksum not in chksum_list + chksum_list_hash):
 168   exit();
 169  if(getargs.checksum in chksum_list):
 170   if(getargs.checksum=="crc16_ansi" or getargs.checksum=="crc16_ibm" or getargs.checksum=="crc16"):
 171    outchck = crc16_ansi_file(getargs.input);
 172    if(not outchck):
 173     exit();
 174    if(not getargs.quiet):
 175     print(str(outchck)+" *"+getargs.input);
 176    else:
 177     print(str(outchck));
 178   if(getargs.checksum=="crc16_ccitt"):
 179    outchck = crc16_ccitt_file(getargs.input);
 180    if(not outchck):
 181     exit();
 182    if(not getargs.quiet):
 183     print(str(outchck)+" *"+getargs.input);
 184    else:
 185     print(str(outchck));
 186   if(getargs.checksum=="crc32"):
 187    outchck = crc32_file(getargs.input);
 188    if(not outchck):
 189     exit();
 190    if(not getargs.quiet):
 191     print(str(outchck)+" *"+getargs.input);
 192    else:
 193     print(str(outchck));
 194   if(getargs.checksum=="adler32"):
 195    outchck = adler32_file(getargs.input);
 196    if(not outchck):
 197     exit();
 198    if(not getargs.quiet):
 199     print(str(outchck)+" *"+getargs.input);
 200    else:
 201     print(str(outchck));
 202   if(getargs.checksum=="crc64_ecma"):
 203    outchck = crc64_ecma_file(getargs.input);
 204    if(not outchck):
 205     exit();
 206    if(not getargs.quiet):
 207     print(str(outchck)+" *"+getargs.input);
 208    else:
 209     print(str(outchck));
 210   if(getargs.checksum=="crc64_iso" or getargs.checksum=="crc64"):
 211    outchck = crc64_iso_file(getargs.input);
 212    if(not outchck):
 213     exit();
 214    if(not getargs.quiet):
 215     print(str(outchck)+" *"+getargs.input);
 216    else:
 217     print(str(outchck));
 218  if(getargs.checksum in chksum_list_hash):
 219   outchck = hash_file(getargs.input, getargs.checksum);
 220   if(not outchck):
 221    exit();
 222   if(not getargs.quiet):
 223    print(str(outchck)+" *"+getargs.input);
 224   else:
 225    print(str(outchck));