1. import hashlib
  3. def verify_text_integrity(text, expected_hash, hash_algorithm='sha256'):
  4. """
  5. Verifies the integrity of a text block using a specified hash algorithm.
  7. Args:
  8. text (str): The text block to verify.
  9. expected_hash (str): The expected hash value.
  10. hash_algorithm (str): The hash algorithm to use (e.g., 'sha256', 'md5'). Defaults to 'sha256'.
  12. Returns:
  13. bool: True if the text's hash matches the expected hash, False otherwise.
  14. Returns False if there's an error during hashing.
  15. """
  16. try:
  17. # Create a hash object based on the specified algorithm
  18. hasher = hashlib.new(hash_algorithm)
  20. # Update the hasher with the text
  21. hasher.update(text.encode('utf-8')) # Encode to bytes
  23. # Get the hexadecimal representation of the hash
  24. calculated_hash = hasher.hexdigest()
  26. # Compare the calculated hash with the expected hash
  27. return calculated_hash == expected_hash
  29. except Exception as e:
  30. print(f"Error during hash calculation: {e}")
  31. return False
  35. if __name__ == '__main__':
  36. # Example Usage
  37. text_block = "This is a test text block."
  38. expected_hash = "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8" #Example SHA256 hash
  40. if verify_text_integrity(text_block, expected_hash):
  41. print("Text block is valid.")
  42. else:
  43. print("Text block is invalid.")
  45. #Test with an incorrect hash
  46. if verify_text_integrity(text_block, "wrong_hash"):
  47. print("Text block is valid.")
  48. else:
  49. print("Text block is invalid.")

Add your comment