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Added multi-backend abstraction for AES-128 CBC primitive
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RNS/Cryptography/AES.py
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55
RNS/Cryptography/AES.py
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# 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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PROVIDER_INTERNAL = 0x01
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PROVIDER_PYCA = 0x02
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provider = PROVIDER_PYCA
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if provider == PROVIDER_INTERNAL:
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pass
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elif provider == PROVIDER_PYCA:
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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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 provider == PROVIDER_INTERNAL:
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pass
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elif provider == PROVIDER_PYCA:
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
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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 provider == PROVIDER_INTERNAL:
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pass
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elif provider == PROVIDER_PYCA:
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cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
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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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@ -1,3 +1,26 @@
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# 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 os
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import time
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import time
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from RNS.Cryptography import HMAC
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from RNS.Cryptography import HMAC
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@ -10,9 +33,12 @@ class Fernet():
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def generate_key():
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def generate_key():
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return os.urandom(32)
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return os.urandom(32)
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def __init__(key = None):
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def __init__(self, key = None):
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if not len(key) != 32:
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if key == None:
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raise ValueError("Fernet key must be 256 bits (32 bytes) long")
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raise ValueError("Fernet key cannot be None")
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if len(key) != 32:
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raise ValueError("Fernet key must be 32 bytes, not "+str(len(key)))
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self._signing_key = key[:16]
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self._signing_key = key[:16]
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self._encryption_key = key[16:]
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self._encryption_key = key[16:]
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@ -33,7 +59,7 @@ class Fernet():
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def encrypt(self, data = None):
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def encrypt(self, data = None):
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iv = os.urandom(16)
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iv = os.urandom(16)
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current_time = time.time()
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current_time = int(time.time())
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if not isinstance(data, bytes):
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if not isinstance(data, bytes):
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raise TypeError("Fernet token plaintext input must be bytes")
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raise TypeError("Fernet token plaintext input must be bytes")
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@ -57,13 +83,13 @@ class Fernet():
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raise ValueError("Fernet token HMAC was invalid")
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raise ValueError("Fernet token HMAC was invalid")
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iv = token[9:25]
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iv = token[9:25]
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ciphertext = [25:-32]
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ciphertext = token[25:-32]
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try:
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try:
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plaintext = PKCS7.unpad(
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plaintext = PKCS7.unpad(
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AES_128_CBC.decrypt(
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AES_128_CBC.decrypt(
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self._encryption_key,
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ciphertext,
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ciphertext,
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self._encryption_key,
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iv,
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iv,
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)
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)
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)
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)
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@ -1,3 +1,25 @@
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# 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 hashlib
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import hashlib
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from math import ceil
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from math import ceil
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from RNS.Cryptography import HMAC
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from RNS.Cryptography import HMAC
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@ -1,3 +1,25 @@
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# 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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class PKCS7:
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class PKCS7:
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BLOCKSIZE = 16
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BLOCKSIZE = 16
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