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Full Discussion: [Python] replicating "sha256 -C checksum_file.txt file.txt"
Top Forums Programming [Python] replicating "sha256 -C checksum_file.txt file.txt" Post 303038559 by da1 on Friday 6th of September 2019 05:02:07 AM
Old 09-06-2019
This is what I came up with so far, thank you for the hints:
Code:
workdir='/tmp'
iso_name='install65.iso'
sha_file='SHA256'

    file = open(workdir + '/' + sha_file, 'r')
    for lines in file:
        values = [x.strip('()') for x in lines.split()]
        #print(values)
        if iso_name == values[1]:
            print('file found')
            if computed_sum == values[-1]:
                print('hash OK')
                print(values[-1])
            else:
                print('hash NOT OK')
                print(values[-1])
                exit(1)
        else:
            print('file NOT found')
    file.close()


But I'm having a hard time understanding how I can search for one string (ex. iso name) and if found, use the same line and check for another string (hash sum).

The result of the code above is this;
Code:
38d1f8cadd502f1c27bf05c5abde6cc505dd28f3f34f8a941048ff9a54f9f608
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file found
hash OK
38d1f8cadd502f1c27bf05c5abde6cc505dd28f3f34f8a941048ff9a54f9f608
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found

--- Post updated at 12:02 PM ---

I spoke too soon.

I came up with this:
Code:
def check_sha256(block_size=65536):
#    fetch_sha256()
    sha256 = hashlib.sha256()
    with open(workdir + "/" + iso_name, 'rb') as f:
      for block in iter(lambda: f.read(block_size), b''):
        sha256.update(block)
    computed_sum = sha256.hexdigest()
    file = open(workdir + '/' + sha_file, 'r')
    for lines in file:
        values = [x.strip('()') for x in lines.split()]
        if iso_name in values[1]:
            if computed_sum in values[-1]:
                print('SHA256: OK')
                break
            else:
                print('SHA256: NOT OK. Exiting... ')
                exit(1)
    file.close()

It works fine from what I can see but any pointers on improvements would be welcomed!

Thank you very much!
 

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LEARN ABOUT REDHAT

grephistory

GREPHISTORY(1)						      General Commands Manual						    GREPHISTORY(1)

NAME

       grephistory - display file names from Usenet history file

SYNOPSIS

       grephistory [ -e ] [ -f filename ] [ -h ] [ -i ] [ -l ] [ -n ] [ -q ] [ -s ] [ -t ] [ messageid ]

DESCRIPTION

       Grephistory queries the dbz(3) index into the history(5) file for an article having a specified Message-ID or hash key of Message-ID.

       If  messageid  cannot  be found in the database, the program prints ``Not found'' and exits with a non-zero status.  If messageid is in the
       database, the program prints the token of the article and exits successfully.

OPTIONS

       -e     If the ``-e'' flag is used, then grephistory will only print the filename of the token of an existing article.

       -f     To specify a different value for the history file and database, use the ``-f'' flag.

       -h     If the ``-h'' flag is used then the hash of the Message-ID will be printed regardless of its existense.

       -i     If the ``-i'' flag is used, then grephistory will read a list of Message-ID's on standard input, one per line.  Leading and trailing
	      whitespace  is  ignored, as are any malformed lines.  It will print on standard output those Message-ID's which are not found in the
	      history database.  This flag is used in processing ``ihave'' control messages.

       -l     If the ``-l'' flag is used then the entire line from the history file will be displayed.

       -n     If no pathname exists, the program will print ``/dev/null'' and exit successfully.  This can happen when an article  has	been  can-
	      celed,  or  if  it has been expired but its history is still retained.  This is default behavior, which can be obtained by using the
	      ``-n'' flag.

       -q     If the ``-q'' flag is used, then no message is displayed.  The program will still exit with the appropriate exit status.

       -s     If the ``-s'' flag is used, then grephistory will read a similar list from its standard input.  It will print on standard  output  a
	      list of filenames for each article that is still available.  This flag is used in processing ``sendme'' control messages.

       -t     If the ``-t'' flag is used, then only the offset into the history text file is printed.

HISTORY

       Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews.  This is revision 1.6.2.1, dated 2000/08/17.

SEE ALSO

       dbz(3), history(5), inn.conf(5).

																    GREPHISTORY(1)
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