Generating hash id’s using uuid3() and uuid5() in Python

Last Updated : 21 Sep, 2021

Python’s UUID class defines four functions and each generates different version of UUIDs. Let’s see how to generate UUID based on MD5 and SHA-1 hash using uuid3() and uuid5() .
Cryptographic hashes can be used to generate different ID’s taking NAMESPACE identifier and a string as input. The functions that support cryptographic hash generation are :

uuid3(namespace, string) : This function uses MD5 hash value of namespaces mentioned with a string to generate a random id of that particular string.
uuid5(namespace, string) : This function uses SHA-1 hash value of namespaces mentioned with a string to generate a random id of that particular string.

uuid module defines the following namespace identifiers for use with uuid3() or uuid5() :

NAMESPACE_DNS : Used when name string is fully qualified domain name.
NAMESPACE_URL : Used when name string is a URL.
NAMESPACE_OID : Used when name string is an ISO OID.
NAMESPACE_X500 : Used when name string is an X.500 DN in DER or a text output format.

Code #1 :

Python3

# Python3 code to demonstrate working 
# of uuid3() and uuid5()
import uuid
 
# initializing a string
url = "https://www.geeksforgeeks.org/fibonacci-sum-subset-elements/"
 
# using NAMESPACE_URL as namespace 
# to generate MD5 hash uuid
print ("The SHA1 hash value generated ID is : ", 
            uuid.uuid3(uuid.NAMESPACE_URL, url))
 
# using NAMESPACE_URL as namespace  
# to generate SHA-1 hash uuid
print ("The MD5 hash value generated ID is : ", 
            uuid.uuid5(uuid.NAMESPACE_URL, url))

Output:

The SHA1 hash value generated ID is :  e13a319e-16d9-3ff5-a83c-96564007998e
The MD5 hash value generated ID is :  dbe3178d-4b83-5024-9b26-9b8e1b280514

Code #2 :

Python3

# Python3 code to demonstrate working  
# of uuid3() and uuid5()
import uuid
 
# initializing a string
qualified_dns = "www.geeksforgeeks.org"
 
# using NAMESPACE_DNS as namespace
# to find MD5 hash id
print ("The SHA1 hash value generated ID is : ", 
    uuid.uuid3(uuid.NAMESPACE_DNS, qualified_dns))
 
# using NAMESPACE_DNS as namespace 
# to generate SHA-1 hash id
print ("The MD5 hash value generated ID is : ", 
    uuid.uuid5(uuid.NAMESPACE_DNS, qualified_dns))

Output:

The SHA1 hash value generated ID is :  adbed9f7-bbe3-376f-b88d-2018b8f6db07
The MD5 hash value generated ID is :  f72cdf8a-b361-50b2-9451-37a997f8675d

Note : The ID generation is 2 step process. First, the concatenation of string and namespaces takes place, then given as input to the respective function to return a 128 UUID generated. If the same NAMESPACE value with a similar string is chosen again, ID generated will be same as well.

Reference : https://docs.python.org/2/library/uuid.html