37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
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import socket
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import binascii
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from Crypto.Cipher import ChaCha20_Poly1305
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# Send an initalization message and decrypt the response.
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# Use this key: d38a3b96a26d0b1139bd30c174884f5dbc8eaaf492493725633ecebfa4ab19e9
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# The server's address and port
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server_address = ('localhost', 5171)
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# Convert hex string to bytes
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ciphertext = binascii.unhexlify('40a7a1ef284e36e65cdb87abdb9aaea7ba4df5ae527b7311ba79a7d7f73729268d5b136c0c701fe366d775315f33e9ef893214fbf26a6ec281c8eadf46663b9d90')
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# Send the encrypted message to the server
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sock.sendto(ciphertext, server_address)
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# Receive the response from the server
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response, server = sock.recvfrom(4096)
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# Decrypt that response
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key = bytes.fromhex('d38a3b96a26d0b1139bd30c174884f5dbc8eaaf492493725633ecebfa4ab19e9')
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# ChaCha20_Poly1305 nonce size is 12 bytes and tag size is 16 bytes
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nonce = response[:12]
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ciphertext_and_tag = response[12:]
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ciphertext = ciphertext_and_tag[:-16]
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tag = ciphertext_and_tag[-16:]
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cipher = ChaCha20_Poly1305.new(key=key, nonce=nonce)
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plaintext = cipher.decrypt_and_verify(ciphertext, tag)
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print("Decrypted message: ", plaintext)
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sock.close()
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