from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
import base64

# Store a string into the variable which needs to be Encrypted
simple_string = "CompanyName\n"

# Display the original string
print("Original String:", simple_string)

# Store the cipher method
ciphering = "AES-128-CTR"

# Use OpenSSl Encryption method
iv_length = algorithms.AES.block_size // 8
options = 0

# Non-NULL Initialization Vector for encryption
encryption_iv = b'1234567891011121'

# Store the encryption key
encryption_key = b"QuantfromExpo"

def encrypt(simple_string, key, iv):
    cipher = Cipher(algorithms.AES(key), modes.CTR(iv), backend=default_backend())
    encryptor = cipher.encryptor()
    encrypted = encryptor.update(simple_string.encode('utf-8')) + encryptor.finalize()
    return base64.b64encode(encrypted).decode('utf-8')

# Use encryption function to encrypt the data
encryption = encrypt(simple_string, encryption_key, encryption_iv)

# Display the encrypted string
print("Encrypted String:", encryption)

# Non-NULL Initialization Vector for decryption
decryption_iv = b'1234567891011121'

# Store the decryption key
decryption_key = b"QuantfromExpo"

def decrypt(encryption, key, iv):
    cipher = Cipher(algorithms.AES(key), modes.CTR(iv), backend=default_backend())
    decryptor = cipher.decryptor()
    decrypted = decryptor.update(base64.b64decode(encryption)) + decryptor.finalize()
    return decrypted.decode('utf-8')

# Use decryption function to decrypt the data
decryption = decrypt(encryption, decryption_key, decryption_iv)

# Display the decrypted string
print("Decrypted String:", decryption)