Python cryptographic modules md5, SHA, crypt use instances

The MD5 (message-digest algorithm 5) module is used to calculate information ciphertext (information Digest) and to derive a 128-bit cipher. The SHA module is similar to MD5, but generates a 160-bit signature. The use method is the same.

The following examples are used with MD5:

Copy the Code code as follows:

#/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) #得到的是二进制的字符串
Print hash.hexdigest () #得到的是一个十六进制的值
Print base64.encodestring (value) #得到base64的值

Copy the Code code as follows:

#/usr/bin/python
#-*-Coding:utf-8-*-
# Validation of information on client-to-server communication

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 is used by UNIX systems to store passwords, and this module is really only useful for checking such passwords.

The following example shows how to use Crypt.crypt to encrypt a password, combine the password and salt and pass it to the function, where the salt contains two-bit random characters. Now you can throw away the original password and save only the encrypted string.
Copy the Code code as follows:

#/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: Http://tools.jb51.net/password/CreateMD5Password

Escape Encryption/decryption tool: http://tools.jb51.net/password/escapepwd

Online SHA1 encryption tool: Http://tools.jb51.net/password/sha1encode

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

Short-chain (short URL) online Restore tool: Http://tools.jb51.net/password/unshorturl

High Strength password generator: Http://tools.jb51.net/password/CreateStrongPassword

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