How do I implement SHA-256 in Python?

How do I implement SHA-256 in Python?

You can use the hashlib library in Python to implement SHA-256. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

import hashlib

# Create a new sha256 hash object
sha256_hash = hashlib.sha256()

# Update the hash object with the bytes-like object (string)
sha256_hash.update(b'Hello, World!')

# Get the hexadecimal representation of the digest
print(sha256_hash.hexdigest())

What if I want to hash a file instead of a string?

You can read the file in binary mode and update the hash object with the file's content. Here's how:

import hashlib

def hash_file(filename):
    sha256_hash = hashlib.sha256()
    with open(filename, 'rb') as f:
        # Read and update hash string value in blocks of 4K
        for byte_block in iter(lambda: f.read(4096), b''):
            sha256_hash.update(byte_block)
    return sha256_hash.hexdigest()

print(hash_file('yourfile.txt'))