70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
import os
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.backends import default_backend
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# Function to encrypt a file using a salt
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def encrypt_file(input_file, output_file=None):
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key = os.urandom(16)
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iv = os.urandom(16)
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cipher = Cipher(algorithms.AES(key), modes.CFB(iv))
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encryptor = cipher.encryptor()
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encrypted_content = b""
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if output_file is not None:
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with open(input_file, 'rb') as infile, open(output_file, 'wb') as outfile:
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# Write the IV to the output file first
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outfile.write(iv)
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encrypted_content += iv
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while chunk := infile.read(2048):
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ciphertext = encryptor.update(chunk)
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outfile.write(ciphertext)
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encrypted_content += ciphertext
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# Finalize encryption
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final_chunk = encryptor.finalize()
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outfile.write(final_chunk)
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encrypted_content += final_chunk
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return key, encrypted_content
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# Function to decrypt a file
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def decrypt_file(key, input_file, output_file=None) -> str:
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plaintext_content = b""
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with open(input_file, 'rb') as infile:
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# Read the IV from the input file
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iv = infile.read(16)
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cipher = Cipher(algorithms.AES(key), modes.CFB(iv))
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decryptor = cipher.decryptor()
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if output_file is not None:
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with open(output_file, 'wb') as outfile:
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while chunk := infile.read(2048):
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plaintext = decryptor.update(chunk)
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outfile.write(plaintext)
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plaintext_content += plaintext
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# Finalize decryption
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final_chunk = decryptor.finalize()
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outfile.write(final_chunk)
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plaintext_content += final_chunk
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else:
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while chunk := infile.read(2048):
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plaintext = decryptor.update(chunk)
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plaintext_content += plaintext
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# Finalize decryption
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plaintext_content += decryptor.finalize()
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try:
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return plaintext_content.decode()
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except UnicodeDecodeError:
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return plaintext_content
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