hashit.py

#!/usr/bin/python2
# coding: utf-8
# Hash a file using a few algos.
# Written for a lab.
import hashlib
import sys

def hashfile(file, algo):
    bs = 65536
    buffer = file.read(bs)
    while len(buffer) > 0:
        algo.update(buffer)
        buffer = file.read(bs)
    return algo.hexdigest()

def main(args):
    if len(args) !=2:
        sys.exit('use: %s file' %(args[0]))
    print "{+} Generating hashes for %s" %(args[1])
    print "{*} MD5:    %s" %(hashfile(file=open(args[1], 'rb'), algo=hashlib.md5()))
    print "{*} SHA1:   %s" %(hashfile(file=open(args[1], 'rb'), algo=hashlib.sha1()))
    print "{*} SHA256: %s" %(hashfile(file=open(args[1], 'rb'), algo=hashlib.sha256()))
    # add more hash algos here if you want and if hashlib supports them...

if __name__ == "__main__":
    main(args=sys.argv)