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[split #103] rewrite MacOS code #105

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[split #103] rewrite MacOS code #105

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54 changes: 30 additions & 24 deletions docs/topics/localfiles_encrypt_decrypt.md
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Original file line number Diff line number Diff line change
Expand Up @@ -63,10 +63,7 @@ On MacOS, decryption is quite simpler. Saves are encrypted with
### **Python**

```py
KEY = ( # python will automatically concatenate two parts
b"\x69\x70\x75\x39\x54\x55\x76\x35\x34\x79\x76\x5d\x69\x73\x46\x4d"
b"\x68\x35\x40\x3b\x74\x2e\x35\x77\x33\x34\x45\x32\x52\x79\x40\x7b"
)
KEY = b'ipu9TUv54yv]isFMh5@;t.5w34E2Ry@{'
```

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Expand All @@ -78,19 +75,24 @@ Here is how actual decryption would be implemented:
### **Python**

```py
from Crypto.Cipher import AES

# using https://pypi.org/project/cryptography/
from cryptography.hazmat.primitives import ciphers, padding

def remove_pad(data: bytes) -> bytes:
last = data[-1]
if last < 16:
data = data[:-last]
return data
mac_cipher = ciphers.Cipher(
ciphers.algorithms.AES256(b'ipu9TUv54yv]isFMh5@;t.5w34E2Ry@{'),
ciphers.modes.ECB()
)
mac_padding = padding.PKCS7(128)


def mac_decrypt(data: bytes) -> str:
cipher = AES.new(KEY, AES.MODE_ECB)
return remove_pad(cipher.decrypt(data)).decode()
decryptor = mac_cipher.decryptor()
unpadder = mac_padding.unpadder()
return (b'%s%s%s' % (
unpadder.update(decryptor.update(data)),
unpadder.update(decryptor.finalize()),
unpadder.finalize()
)).decode()
```

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Expand Down Expand Up @@ -123,20 +125,24 @@ Like on Windows, encryption and decrypion are almost the same:
### **Python**

```py
from Crypto.Cipher import AES
# using https://pypi.org/project/cryptography/
from cryptography.hazmat.primitives import ciphers, padding


def add_pad(data: bytes) -> bytes:
len_r = len(data) % 16
if len_r:
to_add = 16 - len_r
data += to_add.to_bytes(1, "little") * to_add
return data
mac_cipher = ciphers.Cipher(
ciphers.algorithms.AES256(b'ipu9TUv54yv]isFMh5@;t.5w34E2Ry@{'),
ciphers.modes.ECB()
)
mac_padding = padding.PKCS7(128)


def mac_encrypt(data: str) -> bytes:
cipher = AES.new(KEY, AES.MODE_ECB)
return cipher.encrypt(add_pad(data.encode()))
def mac_encrypt(xmlstring: str) -> bytes:
encryptor = mac_cipher.encryptor()
padder = mac_padding.padder()
return b'%s%s%s' % (
encryptor.update(padder.update(xmlstring.encode())),
encryptor.update(padder.finalize()),
encryptor.finalize()
)
```

<!-- tabs:end -->