1. import hashlib
  3. def hash_file_contents(filepath, hash_algorithm='sha256'):
  4. """
  5. Hashes the contents of a file using the specified algorithm.
  7. Args:
  8. filepath (str): The path to the file.
  9. hash_algorithm (str): The hashing algorithm to use (e.g., 'md5', 'sha1', 'sha256', 'sha512'). Defaults to 'sha256'.
  11. Returns:
  12. str: The hexadecimal representation of the file's hash, or None if the file does not exist or an error occurs.
  13. """
  14. try:
  15. # Open the file in binary read mode
  16. with open(filepath, 'rb') as f:
  17. # Create a hash object based on the specified algorithm
  18. hasher = hashlib.new(hash_algorithm)
  19. # Read the file in chunks to handle large files efficiently
  20. while True:
  21. chunk = f.read(4096) # Read 4KB chunks
  22. if not chunk:
  23. break
  24. hasher.update(chunk)
  25. # Return the hexadecimal representation of the hash
  26. return hasher.hexdigest()
  27. except FileNotFoundError:
  28. print(f"Error: File not found at {filepath}")
  29. return None
  30. except Exception as e:
  31. print(f"An error occurred: {e}")
  32. return None
  34. if __name__ == '__main__':
  35. # Example usage:
  36. file_path = 'test_file.txt' # Replace with your file path
  38. # Create a dummy file for testing
  39. with open(file_path, 'w') as f:
  40. f.write("This is a test file.\n")
  41. f.write("It contains some text.\n")
  43. # Calculate the SHA256 hash of the file
  44. sha256_hash = hash_file_contents(file_path, 'sha256')
  45. if sha256_hash:
  46. print(f"SHA256 Hash: {sha256_hash}")
  48. # Calculate the MD5 hash of the file
  49. md5_hash = hash_file_contents(file_path, 'md5')
  50. if md5_hash:
  51. print(f"MD5 Hash: {md5_hash}")

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