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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 DEBIAN

hashalot

HASHALOT(1)						      General Commands Manual						       HASHALOT(1)

NAME

       hashalot - read a passphrase and print a hash

SYNOPSIS

       hashalot [ -s SALT ] [ -x ] [ -n #BYTES ] [ -q ] [ HASHTYPE ]
       HASHTYPE [ -s SALT ] [ -x ] [ -n #BYTES ] [ -q ]

DESCRIPTION

       hashalot  is  a small tool that reads a passphrase from standard input, hashes it using the given hash type, and prints the result to stan-
       dard output.

       Warning: If you do not use the -x option, the hash is printed in binary. This may wedge your terminal settings, or even force  you  to  log
       out.

       Supported values for HASHTYPE:
	       ripemd160 rmd160 rmd160compat sha256 sha384 sha512

OPTIONS

       The option -s SALT specifies an initialization vector to the hashing algorithm. You need this if you want to prevent identical passwords to
       map to identical hashes, which is a security risk.

       If the -x option is given then the hash will be printed as a string of hexadecimal digits.

       The -n option can be used to limit (or increase) the number of bytes output. The default is as appropriate for  the  specified  hash  algo-
       rithm:  20  bytes  for RIPEMD160, 32 bytes for SHA256, etc. The default for the "rmd160compat" hash is 16 bytes, for compatibility with the
       old kerneli.org utilities.

       The -q option causes hashalot to be more quiet and not print some warnings which may be superfluous.

AUTHOR

       Ben Slusky <sluskyb@paranoiacs.org>

       This manual page was written by Matthias Urlichs <smurf@debian.org>.

								    09 Feb 2004 						       HASHALOT(1)
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