How to use the aioboto3.s3.cse.AsymmetricCryptoContext function in aioboto3

async def test_asymmetric_cse_encrypt_decrypt_aes_cbc(event_loop, s3_moto_patch, region, bucket_name, s3_key_name):
    s3_client, s3_resource = s3_moto_patch
    s3_client = s3_client('s3', region_name=region)

    await s3_client.create_bucket(Bucket=bucket_name, CreateBucketConfiguration={'LocationConstraint': region})

    private_key = b'0\x82\x02w\x02\x01\x000\r\x06\t*\x86H\x86\xf7\r\x01\x01\x01\x05\x00\x04\x82\x02a0\x82\x02]\x02\x01\x00\x02\x81\x81\x00\xbb x \x88x\xa6\x1b\x94\r\x93\x82\x9bU4j\x90//4\x97\xfd\x0c\xdf\xd3\x10\xab}\x99\x19\xe4\xfe\xf1=\x8aM\xca\x06\xa6\xf3\xa5\xce8\x19Q\xcc\x12\x1a\xc2\xc4\xd9w\xeex\xf6\xbc\x1f\xb2u\xb3Z\x0e!fsLJ>\x7fi\xdcc\xb9:\xee2\xf8h5h\x1f\x96\xab\xa4\xfc\x02\x12=D\xde\xde}i~\xe8\xe1y\x16\xc0\xe1\xeb\xca\x16\xbde@+\x00\x9e\xbf\x12\xe7\x0c\xa7#\x88\x80\xa04\xe2M\xc2\x1f\xc2\x8a\xfc\x08M\x02\x03\x01\x00\x01\x02\x81\x81\x00\x92\x1d\x0fO\xaf\xe0-+\xd9\x96$9VZ\xd8\x9b\xe0\xcb\xc7\x1bU\x16UH,\x01\x976r&\xa3\x05b\x8f?\xff\xef\xa0\xf4\x19\xc9\xbc\xd5W\x07\xe4\xc5\xba9\x9d\x05\x85\xbd"\x9c\xdeV\r\xbe\x13\xf6\\\x94<\x99\xa0/\xa8\x8f\xd8\x14\xa3\x88\x88\x1b\xdf\xee\xbb\xaf\xcd\xc7k{\xb2\x9e\x90B\x05)\x7f\xedo\x95\xb9[\xf4\x8fQ\xc0\xee\xd0\xc9\xb9\x1e\xbfP\xe7\x8c\x87\xab\x87\n\xfd\xcb\x04\xe5\x9bEv\x0f)8\x94R;\xf8B\xc1\x02A\x00\xe8D\x96\xdd\x1f\xd4\xd1\xbc\xd2p\xd0\x11\x99pkp\xa9\xb5\xdd:\xa7\xdfn\xd6%\x82\xaeK\xb20\xd2\x03\xf2\r\x06\x1as\xc3_\x95\xf3\xab`>\xaa\x1c\xc1\x19]\xa3\xf2]Q+\xf9\xebi\x9feQ\xd6\xf4\xe3\x11\x02A\x00\xce? \xe6=\xad\x14\xf5\x96PY\xf8\xc1\xaa\xb8y\x9f{\xd8\xf4\x94\x8b}\x9c\\\xec\x10\x7f\xfbD"\xbbd\xa3g\x85\xbd\x97\x18\xd7\xde\x99\xb7\x1dw\xbfwb\xbb\xaa\x01\xaf~\x8aW K\xed;{\xf6t\x99}\x02A\x00\x9b\x13\xf8\x9a\x89?B\x0eM\x7fo\x1c\xe1\x12\xd3Yt\xa6m\xa0U\'tL\\\xdd$\xdc{\x8b\xe7\x1d%F\x96\xd5\xa0\x87H\xd1\xc8\xd0\x9a\xc1\x1c9x\xa0$\nk\xae\xec\x9cm\x10F\x04[\xd4\xc9\xad\xd5\xd1\x02@I\xf9V\x81~I\xa0$\xdd\xbf\x00&:\xc0R\xde<\x97\x9d\x1fLP#\xc3{\x88\xa7\xfa_R\xf6\xea#\x94\x80B\xf5\xd7E\xef\xd7Ef\xeaH\xd3\x01\xad\x06\x06Z\x08i\xe8\x90\x8bb\xf09\xcf\xa2{\xfb\xb9\x02@D\xbaAV\x03\x94,\xc7\xf3/\xbd\xf3I\xc2\x0fAI\xcd\x9e\xa1\xce\xdf\xa7\x19S\x86\xf3\xc2\x854]\xac\xab\xc8\x8f@\x03_-?{>\x1f\xcc\x1a@\xdb\n\xf0v5\xe4tL\xf3\x16kD\xb5\x83L(3\xd2'
    public_key = b'0\x81\x9f0\r\x06\t*\x86H\x86\xf7\r\x01\x01\x01\x05\x00\x03\x81\x8d\x000\x81\x89\x02\x81\x81\x00\xbb x \x88x\xa6\x1b\x94\r\x93\x82\x9bU4j\x90//4\x97\xfd\x0c\xdf\xd3\x10\xab}\x99\x19\xe4\xfe\xf1=\x8aM\xca\x06\xa6\xf3\xa5\xce8\x19Q\xcc\x12\x1a\xc2\xc4\xd9w\xeex\xf6\xbc\x1f\xb2u\xb3Z\x0e!fsLJ>\x7fi\xdcc\xb9:\xee2\xf8h5h\x1f\x96\xab\xa4\xfc\x02\x12=D\xde\xde}i~\xe8\xe1y\x16\xc0\xe1\xeb\xca\x16\xbde@+\x00\x9e\xbf\x12\xe7\x0c\xa7#\x88\x80\xa04\xe2M\xc2\x1f\xc2\x8a\xfc\x08M\x02\x03\x01\x00\x01'

    private_key = cse.AsymmetricCryptoContext.from_der_private_key(private_key)
    public_key = cse.AsymmetricCryptoContext.from_der_public_key(public_key)

    symmetric_crypto_context = cse.AsymmetricCryptoContext(public_key=public_key, private_key=private_key)
    s3_cse = cse.S3CSE(symmetric_crypto_context, s3_client_args={'region_name': region})

    async with s3_cse:
        # Upload file
        await s3_cse.put_object(Body=DATA, Bucket=bucket_name, Key=s3_key_name)

        encrypted_resp = await s3_client.get_object(Bucket=bucket_name, Key=s3_key_name)
        encrypted_resp['Body'] = await encrypted_resp['Body'].read()

        # Check it doesnt start with lorem ipsum
        assert not encrypted_resp['Body'].startswith(DATA[:10])

        # Check metadata for KMS encryption
        assert len(base64.b64decode(encrypted_resp['Metadata']['x-amz-key'])) == 128  # 1024bit key
        assert encrypted_resp['Metadata']['x-amz-unencrypted-content-length'] == str(len(DATA))
        assert encrypted_resp['Metadata']['x-amz-matdesc'] == '{}'