24 lines
737 B
Python
24 lines
737 B
Python
import hashlib
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from Crypto.Cipher import AES
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from Crypto.Util.Padding import pad, unpad
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class AESCipher:
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def __init__(self, seed):
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assert len(seed) == 32, "Seed must be 32 bytes long"
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self.private_key = hashlib.sha256(seed).digest()
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def encrypt(self, data: bytes) -> bytes:
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cipher = AES.new(self.private_key, AES.MODE_CBC)
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ct_bytes = cipher.encrypt(pad(data, AES.block_size))
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return cipher.iv + ct_bytes
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def decrypt(self, encrypted_data: bytes) -> bytes:
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iv = encrypted_data[:AES.block_size]
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ct = encrypted_data[AES.block_size:]
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cipher = AES.new(self.private_key, AES.MODE_CBC, iv)
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pt = unpad(cipher.decrypt(ct), AES.block_size)
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return pt
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