Learn hashlib library in Python

 

1. Hashing Strings:

import hashlib

# Hash a string using SHA256 algorithm

string_to_hash = "Hello, World!"

hashed_string = hashlib.sha256(string_to_hash.encode()).hexdigest()

print("Original String:", string_to_hash)

print("Hashed String:", hashed_string)

​

#clcoding.com 

Original String: Hello, World!

Hashed String: dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f

2. Hashing Files:

#clcoding.com 

import hashlib

​

def calculate_file_hash(file_path, algorithm='sha256'):

    # Choose the hash algorithm

    hash_algorithm = getattr(hashlib, algorithm)()

​

    # Read the file in binary mode and update the hash object

    with open(file_path, 'rb') as file:

        for chunk in iter(lambda: file.read(4096), b''):

            hash_algorithm.update(chunk)

​

    # Get the hexadecimal representation of the hash value

    hash_value = hash_algorithm.hexdigest()

    return hash_value

​

# Example usage

file_path = 'example.txt'

file_hash = calculate_file_hash(file_path)

print("SHA-256 Hash of the file:", file_hash)

​

#clcoding.com 

SHA-256 Hash of the file: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

3. Using Different Hash Algorithms:

import hashlib

# Hash a string using different algorithms

string_to_hash = "Hello, World!"

​

# MD5

md5_hash = hashlib.md5(string_to_hash.encode()).hexdigest()

​

# SHA1

sha1_hash = hashlib.sha1(string_to_hash.encode()).hexdigest()

​

# SHA512

sha512_hash = hashlib.sha512(string_to_hash.encode()).hexdigest()

​

print("MD5 Hash:", md5_hash)

print("SHA1 Hash:", sha1_hash)

print("SHA512 Hash:", sha512_hash)

​

#clcoding.com 

MD5 Hash: 65a8e27d8879283831b664bd8b7f0ad4

SHA1 Hash: 0a0a9f2a6772942557ab5355d76af442f8f65e01

SHA512 Hash: 374d794a95cdcfd8b35993185fef9ba368f160d8daf432d08ba9f1ed1e5abe6cc69291e0fa2fe0006a52570ef18c19def4e617c33ce52ef0a6e5fbe318cb0387

4. Hashing Passwords (Securely):

import hashlib

# Hash a password securely using a salt

password = "my_password"

salt = "random_salt"

hashed_password = hashlib.pbkdf2_hmac('sha256', password.encode(), salt.encode(), 100000)

hashed_password_hex = hashed_password.hex()

​

print("Salted and Hashed Password:", hashed_password_hex)

#clcoding.com 

Salted and Hashed Password: b18597b62cda4415c995eaff30f61460da8ff4d758d3880f80593ed5866dcf98

5. Verifying Passwords:

import hashlib

​

# Verify a password against a stored hash

stored_hash = "stored_hashed_password"

​

def verify_password(password, stored_hash):

    input_hash = hashlib.sha256(password.encode()).hexdigest()

    if input_hash == stored_hash:

        return True

    else:

        return False

​

password_to_verify = "password_to_verify"

if verify_password(password_to_verify, stored_hash):

    print("Password is correct!")

else:

    print("Password is incorrect.")

    

#clcoding.com 

Password is incorrect.

6. Hashing a String using SHA-256:

import hashlib

​

# Create a hash object

hash_object = hashlib.sha256()

​

# Update the hash object with the input data

input_data = b'Hello, World!'

hash_object.update(input_data)

​

# Get the hexadecimal representation of the hash value

hash_value = hash_object.hexdigest()

​

print("SHA-256 Hash:", hash_value)

​

#clcoding.com 

SHA-256 Hash: dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f

7. Hashing a String using MD5:

import hashlib

# Create a hash object

hash_object = hashlib.md5()

​

# Update the hash object with the input data

input_data = b'Hello, World!'

hash_object.update(input_data)

​

# Get the hexadecimal representation of the hash value

hash_value = hash_object.hexdigest()

​

print("MD5 Hash:", hash_value)

​

#clcoding.com 

MD5 Hash: 65a8e27d8879283831b664bd8b7f0ad4

​