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66 lines
1.8 KiB
Python
66 lines
1.8 KiB
Python
import json
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import base64
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import hashlib
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import random
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from Crypto.Cipher import AES
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def pad(data: str) -> bytes:
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# Convert the string to bytes and calculate the number of bytes to pad
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data_bytes = data.encode()
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padding = 16 - (len(data_bytes) % 16)
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# Append the padding bytes with their value
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return data_bytes + bytes([padding] * padding)
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def encrypt(data, key):
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salt = ""
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salted = ""
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dx = bytes()
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# Generate salt, as 8 random lowercase letters
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salt = "".join(random.choice("abcdefghijklmnopqrstuvwxyz") for _ in range(8))
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# Our final key and IV come from the key and salt being repeatedly hashed
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for x in range(3):
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dx = hashlib.md5(dx + key.encode() + salt.encode()).digest()
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salted += dx.hex()
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# Pad the data before encryption
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data = pad(data)
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aes = AES.new(
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bytes.fromhex(salted[:64]), AES.MODE_CBC, bytes.fromhex(salted[64:96])
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)
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return json.dumps(
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{
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"ct": base64.b64encode(aes.encrypt(data)).decode(),
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"iv": salted[64:96],
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"s": salt.encode().hex(),
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}
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)
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def unpad(data: bytes) -> bytes:
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# Extract the padding value from the last byte and remove padding
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padding_value = data[-1]
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return data[:-padding_value]
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def decrypt(data: str, key: str):
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# Parse JSON data
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parsed_data = json.loads(base64.b64decode(data))
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ct = base64.b64decode(parsed_data["ct"])
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iv = bytes.fromhex(parsed_data["iv"])
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salt = bytes.fromhex(parsed_data["s"])
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salted = ''
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dx = b''
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for x in range(3):
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dx = hashlib.md5(dx + key.encode() + salt).digest()
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salted += dx.hex()
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aes = AES.new(
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bytes.fromhex(salted[:64]), AES.MODE_CBC, iv
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)
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data = aes.decrypt(ct)
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if data.startswith(b'[{"key":'):
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return unpad(data).decode() |