71 lines
2.6 KiB
Python
Executable File
71 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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A small script to help analyze the md5 hash function.
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@author Christoph J. Scherr <software@cscherr.de>
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@license MIT
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@source: https://git.cscherr.de/PlexSheep/python-dhbw/src/branch/master/src/md5-analyzer.py
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TODO do I need to implement md5 by myself for the assignment?
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"""
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import argparse
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import hashlib
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def main():
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parser = argparse.ArgumentParser(prog="md5-analyzer", description='md5 analyzer for a cryptography assignment')
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parser.add_argument('-i', '--input', type=str,
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help='an input that should be hashed or used with iterate')
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parser.add_argument('-a', '--print-all', action="store_true",
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help="print all hashes in iterate mode")
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parser.add_argument('-t', '--iterate', action="store_true",
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help='iterate 0 to 999999 (chars), generate hashes for this, analyze it\'s hashes.')
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parser.add_argument('-q', '--quiet', action="store_true",
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help="print less")
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parser.add_argument('-m', '--max', action="store", type=int, default=999999,
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help="max value for iteration")
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args = parser.parse_args()
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if args.iterate:
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if not args.input:
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args.input = ""
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if not args.quiet:
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print('='*80)
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hashlist = []
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searchbytes = "0000"
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for i in range(0, args.max + 1):
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# args.max should be included, so +x for the counter
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input = (args.input + str(i))
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hash = hashlib.md5(input.encode())
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found = False
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# print only every 1000 lines for performance
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if hash.hexdigest()[0:4] == searchbytes:
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found = True
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hashlist.append((input, hash.hexdigest()))
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if not args.quiet and (found or i % 1000 == 0 or args.print_all):
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print("inp %s\t\t| out %s" % (input, hash.hexdigest()))
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if found:
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print("^" * 80)
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print('='*80)
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for (index, hash) in hashlist:
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print("inp %s\t\t| has %s" % (index, hash))
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print('='*80)
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size_searchbytes = 16**4
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expected = args.max / size_searchbytes # 32 hex value chars in an md5 hash
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print("found %d items (%f%%) from %d" % (len(hashlist), len(hashlist) / size_searchbytes, args.max))
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print("Expected %f (%f%%) from %d" % (expected, expected / size_searchbytes, args.max))
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exit()
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if args.input:
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print("Hash for '%s':\n%s" % (
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args.input,
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hashlib.md5(args.input.encode()).digest().hex()
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))
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exit()
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# else print help
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parser.print_help()
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if __name__ == "__main__":
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main()
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