clean: remove no-use ecc_aes.py (#2426)

api/libs/ecc_aes.py

-from Crypto.Cipher import AES
-from Crypto.Hash import SHA256
-from Crypto.PublicKey import ECC
-from Crypto.Util.Padding import pad, unpad
-
-
-class ECC_AES:
-    def __init__(self, curve='P-256'):
-        self.curve = curve
-        self._aes_key = None
-        self._private_key = None
-
-    def _derive_aes_key(self, ecc_key, nonce):
-        if not self._aes_key:
-            hasher = SHA256.new()
-            hasher.update(ecc_key.export_key(format='DER') + nonce.encode())
-            self._aes_key = hasher.digest()[:32]
-        return self._aes_key
-
-    def generate_key_pair(self):
-        private_key = ECC.generate(curve=self.curve)
-        public_key = private_key.public_key()
-
-        pem_private = private_key.export_key(format='PEM')
-        pem_public = public_key.export_key(format='PEM')
-
-        return pem_private, pem_public
-
-    def load_private_key(self, private_key_pem):
-        self._private_key = ECC.import_key(private_key_pem)
-        self._aes_key = None
-
-    def encrypt(self, text, nonce):
-        if not self._private_key:
-            raise ValueError("Private key not loaded")
-
-        # Generate AES key using ECC private key and nonce
-        aes_key = self._derive_aes_key(self._private_key, nonce)
-
-        # Encrypt data using AES key
-        cipher = AES.new(aes_key, AES.MODE_ECB)
-        padded_text = pad(text.encode(), AES.block_size)
-        ciphertext = cipher.encrypt(padded_text)
-
-        return ciphertext
-
-    def decrypt(self, ciphertext, nonce):
-        if not self._private_key:
-            raise ValueError("Private key not loaded")
-
-        # Generate AES key using ECC private key and nonce
-        aes_key = self._derive_aes_key(self._private_key, nonce)
-
-        # Decrypt data using AES key
-        cipher = AES.new(aes_key, AES.MODE_ECB)
-        padded_plaintext = cipher.decrypt(ciphertext)
-        plaintext = unpad(padded_plaintext, AES.block_size)
-
-        return plaintext.decode()
-
-
-if __name__ == '__main__':
-    ecc_aes = ECC_AES()
-
-    # Generate key pairs for the user
-    private_key, public_key = ecc_aes.generate_key_pair()
-    ecc_aes.load_private_key(private_key)
-    nonce = "THIS-IS-USER-ID"
-
-    print(private_key)
-
-    # Encrypt a message
-    message = "Hello, this is a secret message!"
-    encrypted_message = ecc_aes.encrypt(message, nonce)
-    print(f"Encrypted message: {encrypted_message.hex()}")
-
-    # Decrypt the message
-    decrypted_message = ecc_aes.decrypt(encrypted_message, nonce)
-    print(f"Decrypted message: {decrypted_message}")
-
-    # Check if the original message and decrypted message are the same
-    assert message == decrypted_message, "Original message and decrypted message do not match"