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Added pure-python AES-256 implementation

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Mark Qvist 2025-05-06 17:20:55 +02:00
parent 1d27fae370
commit cbf4c71a73
6 changed files with 632 additions and 287 deletions
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15
RNS/Cryptography/AES.py
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@ -32,7 +32,8 @@ import RNS.Cryptography.Provider as cp
import RNS.vendor.platformutils as pu
if cp.PROVIDER == cp.PROVIDER_INTERNAL:
from .aes import AES
from .aes import AES128
from .aes import AES256
elif cp.PROVIDER == cp.PROVIDER_PYCA:
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
@ -44,7 +45,7 @@ class AES_128_CBC:
def encrypt(plaintext, key, iv):
if len(key) != 16: raise ValueError(f"Invalid key length {len(key)*8} for {self}")
if cp.PROVIDER == cp.PROVIDER_INTERNAL:
cipher = AES(key)
cipher = AES128(key)
return cipher.encrypt(plaintext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA:
@ -61,7 +62,7 @@ class AES_128_CBC:
def decrypt(ciphertext, key, iv):
if len(key) != 16: raise ValueError(f"Invalid key length {len(key)*8} for {self}")
if cp.PROVIDER == cp.PROVIDER_INTERNAL:
cipher = AES(key)
cipher = AES128(key)
return cipher.decrypt(ciphertext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA:
@ -79,8 +80,8 @@ class AES_256_CBC:
def encrypt(plaintext, key, iv):
if len(key) != 32: raise ValueError(f"Invalid key length {len(key)*8} for {self}")
if cp.PROVIDER == cp.PROVIDER_INTERNAL:
cipher = AES(key)
return cipher.encrypt(plaintext, iv)
cipher = AES256(key)
return cipher.encrypt_cbc(plaintext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA:
if not pu.cryptography_old_api():
@ -96,8 +97,8 @@ class AES_256_CBC:
def decrypt(ciphertext, key, iv):
if len(key) != 32: raise ValueError(f"Invalid key length {len(key)*8} for {self}")
if cp.PROVIDER == cp.PROVIDER_INTERNAL:
cipher = AES(key)
return cipher.decrypt(ciphertext, iv)
cipher = AES256(key)
return cipher.decrypt_cbc(ciphertext, iv)
elif cp.PROVIDER == cp.PROVIDER_PYCA:
if not pu.cryptography_old_api():