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Added Android compatibility to AES proxy class

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This commit is contained in:
Mark Qvist 2022-07-08 00:22:30 +02:00
parent 5158613501
commit 3d979e2d65
1 changed files with 14 additions and 2 deletions
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12
RNS/Cryptography/AES.py
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@ -21,6 +21,7 @@
# SOFTWARE. # SOFTWARE.
import RNS.Cryptography.Provider as cp import RNS.Cryptography.Provider as cp
import RNS.vendor.platformutils as pu
if cp.PROVIDER == cp.PROVIDER_INTERNAL: if cp.PROVIDER == cp.PROVIDER_INTERNAL:
from .aes import AES from .aes import AES
@ -28,6 +29,9 @@ if cp.PROVIDER == cp.PROVIDER_INTERNAL:
elif cp.PROVIDER == cp.PROVIDER_PYCA: elif cp.PROVIDER == cp.PROVIDER_PYCA:
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
if pu.cryptography_old_api():
from cryptography.hazmat.backends import default_backend
class AES_128_CBC: class AES_128_CBC:
@ -38,7 +42,11 @@ class AES_128_CBC:
return cipher.encrypt(plaintext, iv) return cipher.encrypt(plaintext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA: elif cp.PROVIDER == cp.PROVIDER_PYCA:
if not pu.cryptography_old_api():
cipher = Cipher(algorithms.AES(key), modes.CBC(iv)) cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
else:
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
encryptor = cipher.encryptor() encryptor = cipher.encryptor()
ciphertext = encryptor.update(plaintext) + encryptor.finalize() ciphertext = encryptor.update(plaintext) + encryptor.finalize()
return ciphertext return ciphertext
@ -50,7 +58,11 @@ class AES_128_CBC:
return cipher.decrypt(ciphertext, iv) return cipher.decrypt(ciphertext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA: elif cp.PROVIDER == cp.PROVIDER_PYCA:
if not pu.cryptography_old_api():
cipher = Cipher(algorithms.AES(key), modes.CBC(iv)) cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
else:
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
decryptor = cipher.decryptor() decryptor = cipher.decryptor()
plaintext = decryptor.update(ciphertext) + decryptor.finalize() plaintext = decryptor.update(ciphertext) + decryptor.finalize()
return plaintext return plaintext