69 lines
2.7 KiB
Python
69 lines
2.7 KiB
Python
# MIT License
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#
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# Copyright (c) 2022 Mark Qvist / unsigned.io
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import RNS.Cryptography.Provider as cp
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import RNS.vendor.platformutils as pu
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if cp.PROVIDER == cp.PROVIDER_INTERNAL:
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from .aes import AES
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elif cp.PROVIDER == cp.PROVIDER_PYCA:
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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if pu.cryptography_old_api():
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from cryptography.hazmat.backends import default_backend
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class AES_128_CBC:
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@staticmethod
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def encrypt(plaintext, key, iv):
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if cp.PROVIDER == cp.PROVIDER_INTERNAL:
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cipher = AES(key)
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return cipher.encrypt(plaintext, iv)
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elif cp.PROVIDER == cp.PROVIDER_PYCA:
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if not pu.cryptography_old_api():
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
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else:
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
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encryptor = cipher.encryptor()
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ciphertext = encryptor.update(plaintext) + encryptor.finalize()
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return ciphertext
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@staticmethod
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def decrypt(ciphertext, key, iv):
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if cp.PROVIDER == cp.PROVIDER_INTERNAL:
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cipher = AES(key)
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return cipher.decrypt(ciphertext, iv)
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elif cp.PROVIDER == cp.PROVIDER_PYCA:
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if not pu.cryptography_old_api():
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
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else:
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())
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decryptor = cipher.decryptor()
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plaintext = decryptor.update(ciphertext) + decryptor.finalize()
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return plaintext
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