Created
May 22, 2022 06:04
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AES 256 encryption and description in Python 3
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| # AES 256 encryption/decryption using pycrypto library | |
| """ | |
| used Python version: | |
| -------------------- | |
| Python3.8 | |
| requirements: | |
| ------------ | |
| pip3 install -U PyCryptodome | |
| """ | |
| import base64 | |
| import hashlib | |
| from Crypto.Cipher import AES | |
| from Crypto import Random | |
| BLOCK_SIZE = 16 | |
| pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * chr(BLOCK_SIZE - len(s) % BLOCK_SIZE) | |
| unpad = lambda s: s[:-ord(s[len(s) - 1:])] | |
| key = "262731621gvhdwfd7237e623" #a constant key is maintain on both side encryption and decryption | |
| def encrypt(raw, key): | |
| private_key = hashlib.sha256(key.encode("utf-8")).digest() | |
| raw = str.encode(pad(raw)) #convert str to byte | |
| iv = Random.new().read(AES.block_size) | |
| cipher = AES.new(private_key, AES.MODE_CBC, iv) | |
| return base64.b64encode(iv + cipher.encrypt(raw)) | |
| def decrypt(enc, key): | |
| private_key = hashlib.sha256(key.encode("utf-8")).digest() | |
| enc = base64.b64decode(enc) | |
| iv = enc[:16] | |
| cipher = AES.new(private_key, AES.MODE_CBC, iv) | |
| return unpad(cipher.decrypt(enc[16:])) | |
| #---------------------------------- | |
| #.........Encryption............... | |
| message = "This is a secret message" | |
| encrypted = encrypt(message, key) | |
| print(encrypted) | |
| #---------------------------------- | |
| #.........Decryption............... | |
| decrypted = decrypt(encrypted, key) | |
| print(bytes.decode(decrypted)) |
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