Hash calculation tool.

hash.py

#!/usr/bin/env python

import os, sys
import hashlib


def usage(full=False):
    msg = ''
    if full:
        msg += 'Computes hash of a string.' + os.linesep
        msg += 'https://gist.github.com/ishahid/8429763' + os.linesep

    msg += os.linesep
    msg += 'Usage: hash.py [[OPTION]] <string>]' + os.linesep
    msg += os.linesep
    msg += 'Options:' + os.linesep
    msg += '    -md5          Calculate MD5 hash of the string.' + os.linesep
    msg += '                  Default option if no option is specified.' + os.linesep
    msg += '    -sha1         Calculate SHA1 hash of the string.' + os.linesep
    msg += '    -sha224       Calculate SHA224 hash of the string.' + os.linesep
    msg += '    -sha256       Calculate SHA256 hash of the string.' + os.linesep
    msg += '    -sha384       Calculate SHA384 hash of the string.' + os.linesep
    msg += '    -sha512       Calculate SHA512 hash of the string.' + os.linesep
    msg += '    -all          Calculate all types of hashes of the string.' + os.linesep
    return msg


if __name__ == "__main__":
    hash = ''
    length = len(sys.argv)
    
    if length == 1:
        print usage(True)

    elif length == 2:
        hash = hashlib.md5(sys.argv[1]).hexdigest()
        print hash.lower()

    elif length == 3:
        if sys.argv[1] == "-md5":
            hash = hashlib.md5(sys.argv[2]).hexdigest()
            print hash.lower()

        elif sys.argv[1] == "-sha1":
                hash = hashlib.sha1(sys.argv[2]).hexdigest()
                print hash.lower()

        elif sys.argv[1] == "-sha224":
                hash = hashlib.sha224(sys.argv[2]).hexdigest()
                print hash.lower()

        elif sys.argv[1] == "-sha256":
                hash = hashlib.sha256(sys.argv[2]).hexdigest()
                print hash.lower()

        elif sys.argv[1] == "-sha384":
                hash = hashlib.sha384(sys.argv[2]).hexdigest()
                print hash.lower()

        elif sys.argv[1] == "-sha512":
                hash = hashlib.sha512(sys.argv[2]).hexdigest()
                print hash.lower()

        elif sys.argv[1] == "-all":
                print 'md5:    ' + hashlib.md5(sys.argv[2]).hexdigest().lower()
                print 'sha1:   ' + hashlib.sha1(sys.argv[2]).hexdigest().lower()
                print 'sha224: ' + hashlib.sha224(sys.argv[2]).hexdigest().lower()
                print 'sha256: ' + hashlib.sha256(sys.argv[2]).hexdigest().lower()
                print 'sha384: ' + hashlib.sha384(sys.argv[2]).hexdigest().lower()
                print 'sha512: ' + hashlib.sha512(sys.argv[2]).hexdigest().lower()

        else:
            print 'Invalid switch.'
            print usage(False)

    else:
        print 'Invalid switch.'
        print usage(False)