mirror of
https://github.com/comma-hacks/webrtc.git
synced 2025-10-05 16:16:56 +08:00
37 lines
1.3 KiB
Python
37 lines
1.3 KiB
Python
import os
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import base64
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from typing import Tuple
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.backends import default_backend
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def encrypt(key: bytes, insecure: bytes) -> bytes:
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plain_text = insecure.encode()
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iv = os.urandom(16)
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key_bytes = key.encode()
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cipher = Cipher(algorithms.AES(key_bytes), modes.CBC(iv), backend=default_backend())
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encryptor = cipher.encryptor()
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padded_plain_text = PKCS7Padding(plain_text, 16)
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cipher_text = iv + encryptor.update(padded_plain_text) + encryptor.finalize()
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return base64.b64encode(cipher_text).decode()
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def decrypt(key: bytes, secure: bytes) -> bytes:
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cipher_text = base64.b64decode(secure)
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key_bytes = key.encode()
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iv = cipher_text[:16]
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cipher_text = cipher_text[16:]
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cipher = Cipher(algorithms.AES(key_bytes), modes.CBC(iv), backend=default_backend())
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decryptor = cipher.decryptor()
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decrypted_text = decryptor.update(cipher_text) + decryptor.finalize()
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padding_length = decrypted_text[-1]
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decrypted_text = decrypted_text[:-padding_length]
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return decrypted_text
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def PKCS7Padding(data: bytes, block_size: int) -> bytes:
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padding_length = block_size - (len(data) % block_size)
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padding = bytes([padding_length]) * padding_length
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return data + padding
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