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Make Encryption an interface instead of an union

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This commit is contained in:
Joakim Holm 2024-01-09 14:44:22 +01:00
parent f4376402fd
commit 373ab7c4fc
1 changed files with 26 additions and 24 deletions
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50
grawlix/encryption.py
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@ -1,5 +1,5 @@
from Crypto.Cipher import AES from Crypto.Cipher import AES
from typing import Union from typing import Union, Protocol
from dataclasses import dataclass from dataclasses import dataclass
@ -8,6 +8,10 @@ class AESEncryption:
key: bytes key: bytes
iv: bytes iv: bytes
def decrypt(self, data: bytes) -> bytes:
cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
return cipher.decrypt(data)
@dataclass(slots=True) @dataclass(slots=True)
class AESCTREncryption: class AESCTREncryption:
@ -15,16 +19,31 @@ class AESCTREncryption:
nonce: bytes nonce: bytes
initial_value: bytes initial_value: bytes
def decrypt(self, data: bytes) -> bytes:
cipher = AES.new(
key = self.key,
mode = AES.MODE_CTR,
nonce = self.nonce,
initial_value = self.initial_value
)
return cipher.decrypt(data)
@dataclass(slots=True) @dataclass(slots=True)
class XOrEncryption: class XOrEncryption:
key: bytes key: bytes
Encryption = Union[ def decrypt(self, data: bytes) -> bytes:
AESCTREncryption, key_length = len(self.key)
AESEncryption, decoded = []
XOrEncryption for i in range(0, len(data)):
] decoded.append(data[i] ^ self.key[i % key_length])
return bytes(decoded)
class Encryption(Protocol):
def decrypt(self, data: bytes) -> bytes: ...
def decrypt(data: bytes, encryption: Encryption) -> bytes: def decrypt(data: bytes, encryption: Encryption) -> bytes:
""" """
@ -34,21 +53,4 @@ def decrypt(data: bytes, encryption: Encryption) -> bytes:
:param encryption: Information about how to decrypt :param encryption: Information about how to decrypt
:returns: Decrypted data :returns: Decrypted data
""" """
if isinstance(encryption, AESCTREncryption): return encryption.decrypt(data)
cipher = AES.new(
key = encryption.key,
mode = AES.MODE_CTR,
nonce = encryption.nonce,
initial_value = encryption.initial_value
)
return cipher.decrypt(data)
if isinstance(encryption, AESEncryption):
cipher = AES.new(encryption.key, AES.MODE_CBC, encryption.iv)
return cipher.decrypt(data)
if isinstance(encryption, XOrEncryption):
key_length = len(encryption.key)
decoded = []
for i in range(0, len(data)):
decoded.append(data[i] ^ encryption.key[i % key_length])
return bytes(decoded)
raise NotImplemented