Python's cryptographic modules md5 sha crypt use instances

The MD5(message-digest Algorithm 5) module is used to calculate the information ciphertext (information Digest) and obtain a 128-bit ciphertext. The sha module is similar to md5, but generates a 160-bit signature. The usage is the same.

The following example USES md5:

# /usr/bin/python

# -*- coding:utf-8 -*-

import base64

try:

    import hashlib

    hash = hashlib.md5()

except ImportError:

    # for Python << 2.5

    import md5

    hash = md5.new()

hash.update('spam,spam,and egges')

value = hash.digest()

print repr(value)   # You get a binary string 

print hash.hexdigest()  # You get a hexadecimal value 

print base64.encodestring(value) # get base64 The value of the 

# /usr/bin/python

# -*- coding:utf-8 -*-

#  Validation of information communicated between client and server 
import string

import random
def getchallenge():

    challenge = map(lambda i: chr(random.randint(0,255)),range(16))

    return string.join(challenge,"")
def getresponse(password,challenge):

    try:

        import hashlib

        hash = hashlib.md5()

    except ImportError:

        # for Python << 2.5

        import md5

        hash = md5.new()

    hash.update(password)

    hash.update(challenge)

    return  hash.digest()
print "client: ","connect"

challenge= getchallenge()

print "server: ",repr(challenge)

client_response = getresponse("trustno1",challenge)

print "client: ",repr(client_response)

server_response = getresponse("trustno1",challenge)

if client_response == server_response:

    print "server:","login ok"

The crypt module (unix-only) implements one-way DES encryption, which Unix systems use to store passwords, and is really only useful for checking such passwords.

The following example shows how to use crypt. Crypt to encrypt a password, combine the password with a salt and pass it to the function, where the salt contains two random characters.

# /usr/bin/python

# -*- coding:utf-8 -*-
import crypt

import random,string
def getsalt(chars = string.letters+string.digits):

    return random.choice(chars)+random.choice(chars)
salt = getsalt()

print salt

print crypt.crypt('bananas',salt)

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MD5 online encryption tool: (link: http://tools.jb51.net/password/CreateMD5Password)

Escape encryption/decryption tool: (link: http://tools.jb51.net/password/escapepwd)

Online SHA1 encryption tool: (link: http://tools.jb51.net/password/sha1encode)

Short chain (short url) online generation tool: (link: http://tools.jb51.net/password/dwzcreate)

Short chain (short url) online restore tool: (link: http://tools.jb51.net/password/unshorturl)

High-strength password generator: (link: http://tools.jb51.net/password/CreateStrongPassword)