Random hash in Python

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What is the easiest way to generate a random hash (MD5) in Python?

A md5-hash is just a 128-bit value, so if you want a random one:

import random

hash = random.getrandbits(128)

print("hash value: %032x" % hash)

I don't really see the point, though. Maybe you should elaborate why you need this...

Efficiently generate a 16-character, alphanumeric string, As none of the answers provide you with a random string consisting of characters 0-9, a-z, A-Z: Here is There is an even shorter version since python 3.6.2 : import os >> import hashlib >> random_data = os.urandom(128)� The hash() method returns the hash value of an object if it has one. Hash values are just integers which are used to compare dictionary keys during a dictionary lookup quickly. Internally, hash() method calls __hash__() method of an object which are set by default for any object.

I think what you are looking for is a universal unique identifier.Then the module UUID in python is what you are looking for.

import uuid
uuid.uuid4().hex

UUID4 gives you a random unique identifier that has the same length as a md5 sum. Hex will represent is as an hex string instead of returning a uuid object.

http://docs.python.org/2/library/uuid.html

Python Generate a Random String and Password, Generate a random string of a fixed length in Python. Generate a random string of lower case, upper case letters, digits, and special characters. hashlib.pbkdf2_hmac (hash_name, password, salt, iterations, dklen=None) ¶ The function provides PKCS#5 password-based key derivation function 2. It uses HMAC as pseudorandom function. The string hash_name is the desired name of the hash digest algorithm for HMAC, e.g. ‘sha1’ or ‘sha256’. password and salt are interpreted as buffers of bytes.

This works for both python 2.x and 3.x

import os
import binascii
print(binascii.hexlify(os.urandom(16)))
'4a4d443679ed46f7514ad6dbe3733c3d'

secrets — Generate secure random numbers for managing secrets , The secrets module is used for generating cryptographically strong random and hashed using a cryptographically-strong one-way (irreversible) hash function . Changed in version 3.4: Parameter key can be a bytes or bytearray object. Parameter msg can be of any type supported by hashlib.Parameter digestmod can be the name of a hash algorithm.

The secrets module was added in Python 3.6+. It provides cryptographically secure random values with a single call. The functions take an optional nbytes argument, default is 32 (bytes * 8 bits = 256-bit tokens). MD5 has 128-bit hashes, so provide 16 for "MD5-like" tokens.

>>> import secrets

>>> secrets.token_hex(nbytes=16)
'17adbcf543e851aa9216acc9d7206b96'

>>> secrets.token_urlsafe(16)
'X7NYIolv893DXLunTzeTIQ'

>>> secrets.token_bytes(128 // 8)
b'\x0b\xdcA\xc0.\x0e\x87\x9b`\x93\\Ev\x1a|u'

Random MD5 Python script � GitHub, Prints an MD5 hash from a random string. # Helpful resources: # http:// stackoverflow.com/questions/785058/random-strings-in-python-2-6-is-this-ok. Basically, in a hash-based language like python, speed is absolutely critical, and so a simple deterministic function beats a random one. They also choose a hash function with good memory performance in common cases.

Yet another approach. You won't have to format an int to get it.

import random
import string

def random_string(length):
    pool = string.letters + string.digits
    return ''.join(random.choice(pool) for i in xrange(length))

Gives you flexibility on the length of the string.

>>> random_string(64)
'XTgDkdxHK7seEbNDDUim9gUBFiheRLRgg7HyP18j6BZU5Sa7AXiCHP1NEIxuL2s0'

Generating Random id's using UUID in Python, Advantages of UUID : Can be used as general utility to generate unique random id. Can be used in cryptography and hashing applications. Useful in generating� One reason why Python is so easy to get started with is that it has dynamic types. You don’t have to specify the type of a variable, you just use variables as labels for containers of data. But

How to generate a random 128 bit strings using Python?, You can generate these just random 128-bit strings using the random import random hash = random.getrandbits(128) print(hex(hash))� Return a random URL-safe text string, containing nbytes random bytes. The text is Base64 encoded, so on average each byte results in approximately 1.3 characters. If nbytes is None or not supplied, a reasonable default is used. >>> token_urlsafe(16) 'Drmhze6EPcv0fN_81Bj-nA'

Generating Different Hash Functions, Since Python's built-in hash() function is random, a NEW random result can be generated by applying the XOR with another number. Lets see� Python Programming A random 24 bit hash is just random 24 bits. You can generate these just using the random module.

Generating Random Data in Python (Guide) – Real Python, Why Not Just “Default to” SystemRandom? Odds and Ends: Hashing; Recap; Additional Links. Watch Now This�

Comments
  • Random as in for anything? Or for an object? If you just want a random MD5, just pick some numbers.
  • I am renaming files before uploading and want a filename like this: timestamp_randommd5.extension Cheers!
  • You could just rename them to timestamp_randomnumber.ext. There really isn't a reason why md5(randomnumber) would be any better than randomnumber itself.
  • best answer for Python 3 is the last one import uuid; uuid.uuid().hex stackoverflow.com/a/20060712/3218806
  • +1 for not computing a relatively expensive hash from a random number: this approach is 5x faster.
  • +1 - surely this is better than my answer, can be used also like this: hex(random.getrandbits(128))[2:-1] this gives you same output as md5 hexdigest method.
  • the random.seed() call is useless, more or less.
  • I would've used os.urandom because wanting an MD5 hash might mean wanting a secure one.
  • Here's how to do it with os.urandom: ''.join('%02x' % ord(x) for x in os.urandom(16))
  • This way of hexadecimal encoding doesn't work in Python 3 anymore.
  • thanks. this is the best way to make a random hash key.
  • works for 2.x and 3.x: binascii.hexlify(os.urandom(16))