import binascii
from Crypto.Cipher import AES
from Crypto.Util import Counter
from Crypto import Random
 
key_bytes = 32
 
def encrypt(key, plaintext):
    assert len(key) == key_bytes
 
    iv = Random.new().read(AES.block_size)
 
    iv_int = int(binascii.hexlify(iv), 16) 
 
    ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
 
    aes = AES.new(key, AES.MODE_CTR, counter=ctr)
 
    ciphertext = aes.encrypt(plaintext)
    return (iv, ciphertext)
 
def decrypt(key, iv, ciphertext):
    assert len(key) == key_bytes
 
    iv_int = int(iv.encode('hex'), 16) 
    ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
 
    aes = AES.new(key, AES.MODE_CTR, counter=ctr)
 
    plaintext = aes.decrypt(ciphertext)
    return plaintext
 
key = '01234567890123456789012345678901'
(iv, ciphertext) = encrypt(key, 'Coronavirus')
print (decrypt(key, iv, ciphertext))

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