Added File-Encryptor-Decryptor files : #1034

BasicPythonScripts/File Encryptor Decryptor/README.md

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+## File Encryption and Decryption :
+
+### Description :
+- The script lets you encrypt or decrypt a file.
+- To do so, we use the [pycryptodome](https://pycryptodome.readthedocs.io/en/latest/) library.
+- The user passes the function and also the file on which the same is to be performed.
+- Once the parameters are passed, the encryptor needs to specify a password which is later required on the decryptor's side to decrypt the file.
+- All passwords are hidden with asteriks using the [pwinput](https://github.com/asweigart/pwinput) library.
+
+### Try it out yourself :
+
+- Install libraries : ```pip install -r requirements.txt```
+- The parameters that are to be passed are :
+ * Operation : ```-e/-d``` for encryption/decryption [any one]
+ * File name : pass ```filename.ext``` after operation
+- Place your file in the "original" folder.
+- Once file.txt is encrypted, a new encrypted file called enc-file.txt is generated in the "encrypted" folder.
+- The encrypted file enc-file.txt when decrypted, results in a new file called dec-file.txt (in the "decrypted" folder)
+- Run the script : 
+ * Encryption : ```python file_encryptor_decryptor.py -e file.jpg```
+ * Decryption : ```python file_encryptor_decryptor.py -d enc-file.jpg```
+
+### Sample results :
+- Try opening the encrypted file enc-image.jpg from the encrypted folder.
+- Now try opening the decrypted file dec-image.jpg from the decrypted folder.
+- Both these files were originally generated from image.jpg. Compare the decrypted file and original file to see if they're the same.
+
+![Sample Results](https://i.imgur.com/SgERi2K.png)

BasicPythonScripts/File Encryptor Decryptor/decrypted/README.md

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+## Decrypted Folder :
+
+- The decrypted files will be generated in this folder.
+- All decrypted files have "dec-" added to the start. (test.txt when decrypted becomes dec-test.txt)
+- Objective of decryption is achieved when the decrypted file matches with the original file.
+
+## Sample Image :
+
+![Sample-Image](https://i.imgur.com/dYlGzNGm.jpg)
+- *Source: Self generated* - [*Decrypted image*](https://i.imgur.com/dYlGzNG.jpg)

BasicPythonScripts/File Encryptor Decryptor/decrypted/dec-test.txt

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+1234
+1234
+1234
+1234
+1234
+1234

BasicPythonScripts/File Encryptor Decryptor/encrypted/README.md

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+## Encrypted Folder :
+
+- The encrypted files will be generated in this folder.
+- All encrypted files have "enc-" added to the start. (test.txt when encrypted becomes enc-test.txt)
+- Objective of encryption is achieved when the file is encrypted and cannot be read.

BasicPythonScripts/File Encryptor Decryptor/encrypted/enc-test.txt

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+0000000000000034t��)�s={�6p��,�p�k�h!��?*�O��2g���=�L�L�s�N�3��1�̮�Y���

BasicPythonScripts/File Encryptor Decryptor/file_encryptor_decryptor.py

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+import os
+import sys
+import getopt
+from pwinput import pwinput
+from Crypto.Cipher import AES
+from Crypto.Hash import SHA256
+from Crypto import Random
+
+# --- SET DEFAULTS ---
+is_encrypt = False
+is_decrypt = False
+org_file_name = ''
+argumentList = sys.argv[1:]
+options = 'e:d:'
+
+# --- DEFINE ARG OPERATIONS ---
+try:
+ args, values = getopt.getopt(argumentList, options)
+ for currentArgument, currentValue in args:
+ if currentArgument in ('-e'):
+ is_encrypt = True
+ org_file_name = currentValue
+ print('Encrypt :', currentValue)
+ if currentArgument in ('-d'):
+ is_decrypt = True
+ org_file_name = currentValue
+ print('Decrypt :', currentValue)
+except getopt.error as e:
+ print(str(e))
+
+# --- FUNCTION FOR ENCRYPTION ---
+def encrypt(key, filename):
+ chunksize = 64*1024
+ outputFile = "encrypted/enc-"+filename
+ filesize = str(os.path.getsize('original/'+filename)).zfill(16)
+ IV = Random.new().read(16)
+ encryptor = AES.new(key, AES.MODE_CBC, IV)
+
+ with open('original/'+filename, 'rb') as infile:
+ with open(outputFile, 'wb') as outfile:
+ outfile.write(filesize.encode('utf-8'))
+ outfile.write(IV)
+
+ while True:
+ chunk = infile.read(chunksize)
+ if len(chunk) == 0:
+ break
+ elif len(chunk) % 16 != 0:
+ chunk += b' ' * (16 - (len(chunk) % 16))
+ outfile.write(encryptor.encrypt(chunk))
+
+# --- FUNCTION FOR DECRYPTION ---
+def decrypt(key, filename):
+ chunksize = 64*1024
+ outputFile = "decrypted/dec-"+filename[4:]
+
+ with open('encrypted/'+filename, 'rb') as infile:
+ filesize = int(infile.read(16))
+ IV = infile.read(16)
+ decryptor = AES.new(key, AES.MODE_CBC, IV)
+ with open(outputFile, 'wb') as outfile:
+ while True:
+ chunk = infile.read(chunksize)
+ if len(chunk) == 0:
+ break
+ outfile.write(decryptor.decrypt(chunk))
+ outfile.truncate(filesize)
+
+# --- PASSWORD HASHING ---
+def getKey(password):
+ hasher = SHA256.new(password.encode('utf-8'))
+ return hasher.digest()
+
+def Main():
+
+ # --- ENCRYPT OPTION SELECTED ---
+ if is_encrypt:
+ filename = org_file_name
+ password = pwinput(prompt='Encryption Password : ')
+ encrypt(getKey(password), filename)
+ print('Encryption Done! Encrypted file in "encrypted" folder.')
+
+ # --- DECRYPT OPTION SELECTED ---
+ elif is_decrypt:
+ filename = org_file_name
+ password = pwinput(prompt='Decryption Password : ')
+ decrypt(getKey(password), filename)
+ print('Decryption Done! Decrypted file in "decrypted" folder.')
+
+ # --- INVALID OPTIONS PASSED ---
+ else:
+ print('Invalid Option! Closing...')
+
+if __name__ == '__main__':
+ Main()

BasicPythonScripts/File Encryptor Decryptor/original/README.md

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+## Original Folder :
+
+- Place your original files in this folder.
+- Files can be of various extensions (.png, .txt, .jpg, etc).
+- You can use the test file provided in the folder or the sample image (provided below) for testing.
+
+## Sample Image :
+
+![Sample-Image](https://i.imgur.com/kU1evP5m.jpg)
+- *Source: Self generated* - [*Test image*](https://i.imgur.com/kU1evP5.jpg)

BasicPythonScripts/File Encryptor Decryptor/original/test.txt

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+1234
+1234
+1234
+1234
+1234
+1234

BasicPythonScripts/File Encryptor Decryptor/requirements.txt

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+pwinput==1.0.2
+pycryptodome==3.10.1