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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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MboxParser::Mail::Body(3pm)				User Contributed Perl Documentation			       MboxParser::Mail::Body(3pm)

NAME
Mail::MboxParser::Mail::Body - rudimentary mail-body object SYNOPSIS
use Mail::MboxParser; [...] # $msg is a Mail::MboxParser::Mail my $body = $msg->body(0); # or preferably my $body = $msg->body($msg->find_body); for my $line ($body->signature) { print $line, " " } for my $url ($body->extract_urls(unique => 1)) { print $url->{url}, " "; print $url->{context}, " "; } DESCRIPTION
This class represents the body of an email-message. Since emails can have multiple MIME-parts and each of these parts has a body it is not always easy to say which part actually holds the text of the message (if there is any at all). Mail::MboxParser::Mail::find_body will help and suggest a part. METHODS
as_string ([strip_sig => 1]) Returns the textual representation of the body as one string. Decoding takes place when the mailbox has been opened using the decode => 'BODY' | 'ALL' option. If 'strip_sig' is set to a true value, the signature is stripped from the string. as_lines ([strip_sig => 1]) Sames as as_string() just that you get an array of lines with newlines attached to each line. NOTE: When the body is actually some encoded binary data (most commonly such a body is base64-encoded), you can still use this method. Then you wont really get proper lines. Instead you get chunks of binary data that you should concatenate as in my $binary = join "", $body->as_lines; If 'strip_sig' is set to a true value, the signature is stripped from the string. signature Returns the signature of a message as an array of lines. Trailing newlines are already removed. $body->error returns a string if no signature has been found. extract_urls extract_urls (unique => 1) Returns an array of hash-refs. Each hash-ref has two fields: 'url' and 'context' where context is the line in which the 'url' appeared. When calling it like $mail->extract_urls(unique => 1), duplicate URLs will be filtered out regardless of the 'context'. That's useful if you just want a list of all URLs that can be found in your mails. $body->error() will return a string if no URLs could be found within the body. quotes Returns a hash-ref of array-refs where the hash-keys are the several levels of quotation. Each array-element contains the paragraphs of this quotation-level as one string. Example: my $quotes = $msg->body($msg->find_body)->quotes; print $quotes->{1}->[0], " "; print $quotes->{0}->[0], " "; This should print the first paragraph of the mail-body that has been quoted once and below that the paragraph that supposedly is the reply to this paragraph. Perhaps thus: > I had been trying to work with the CGI module > but I didn't yet fully understand it. Ah, it is tricky. Have you read the CGI-FAQ that comes with the module? Mark that empty lines will not be ignored and are part of the lines contained in the array of $quotes->{0}. So below is a little code-snippet that should, in most cases, restore the first 5 paragraphs (containing quote-level 0 and 1) of an email: for (0 .. 4) { print $quotes->{0}->[$_]; print $quotes->{1}->[$_]; } Since quotes() considers an empty line between two quotes paragraphs as a paragraph in $quotes->{0}, the paragraphs with one quote and those with zero are balanced. That means: scalar @{$quotes->{0}} - DIFF == scalar @{$quotes->{1}} where DIFF is element of {-1, 0, 1}. Unfortunately, quotes() can up to now only deal with '>' as quotation-marks. VERSION
This is version 0.55. AUTHOR AND COPYRIGHT
Tassilo von Parseval <tassilo.von.parseval@rwth-aachen.de> Copyright (c) 2001-2005 Tassilo von Parseval. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl v5.12.3 2005-12-08 MboxParser::Mail::Body(3pm)
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