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Python SDK

You can use our Python SDK to:

  • Encrypt data server-side
  • Decrypt data server-side
  • Invoke Functions
  • Proxy requests through Outbound Relay

Encrypting/Decrypting data with our backend SDKs instead of Inbound Relay may expose you to greater compliance burden because your server handles plaintext data.

Instead you can:

  • Use an Inbound Relay to encrypt data before it reaches your server.
  • Use an Outbound Relay to decrypt data before it reaches a third-party service.
  • Use our client-side SDKs to encrypt data before sending it to your server.

Quickstart

Install SDK

Our Python SDK is distributed via pypi, and can be installed using pip.

lovelace:~$
pip install evervault

Initialize SDK

Now, let's initialize the SDK using our App's ID and our App's API key. If you don't have an API key yet, you can get one by creating an App in the Evervault Dashboard.

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import evervault
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evervault.init("<APP_ID>", "<API_KEY>")

Encrypt a string

Now that the SDK is initialized, we can encrypt a string.

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encrypted = evervault.encrypt("Hello, world!")

Full example

Pulling all of this together leaves us with the following working example. You can copy and paste the code below (using a sandbox API key, and App ID), run it in your own environment and run the encryption and decryption for yourself.

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import evervault
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evervault.init("<APP_ID>", "<API_KEY>")
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encrypted = evervault.encrypt("Hello, world!")
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print(encrypted)

Reference

evervault.init(app_id, api_key)

Initializes the SDK with your API Key and App ID.

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import evervault
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evervault.init(
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    # Your App's ID
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    app_id="<APP_ID>"
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    # Your App's API key 
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    api_key="<API_KEY>",
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)
Parameters
app_idRequiredstr, Default: None

Your App's ID.

api_keyRequiredstr, Default: None

Your App's API Key.

evervault.encrypt(data)

Encrypts data using Evervault Encryption.

To encrypt a string using the Python SDK, simply pass a str or a dict into the evervault.encrypt() function. To encrypt a file, pass a bytes or bytearray.

The encrypted data can be stored in your database or file storage as normal. Evervault Strings can be used across all of our products. Evervault File Encryption is currently in Beta, and files can only be decrypted with Outbound Relay.

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import evervault
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evervault.init(app_id="<APP_ID>", api_key="<API_KEY>")
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# encrypt a string
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encrypted = evervault.encrypt("Hello, world!")
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# encrypt a file
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with open("<input-filename>", mode="rb") as plaintext_file:
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  contents = plaintext_file.read()
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  encrypted_contents = evervault.encrypt(contents)
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  with open("<output-filename>", "wb") as encrypted_file:
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    encrypted_file.write(encrypted_contents)
Parameters
dataRequiredstr | dict | bytes | bytearray

The data to encrypt.

evervault.decrypt(data)

evervault.decerypt() decrypts the data previously encrypted with the encrypt() function or through Relay.

An API key with the decrypt permission must be used to perform this operation.

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import evervault
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evervault.init(app_id="<APP_ID>", api_key="<API_KEY>")
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encrypted = evervault.encrypt("Hello, world!")
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decrypted = evervault.decrypt(encrypted)
Parameters
dataRequiredstr | list | dict | bytes | bytearray

The data to decrypt.

Decrypting data with our backend SDKs is not available if you are part of the PCI or HIPAA compliance use cases

Instead you can:

evervault.run(function_name, data, options)

evervault.run() lets you invoke an Evervault Function with a given payload.

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import evervault
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evervault.init(app_id="<APP_ID>", api_key="<API_KEY>")
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result = evervault.run(
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    "hello-function",
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    {
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        "name": "Claude Shannon",
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        "ssn": "ev:encrypted_string"
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    },
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    {
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        "async": False,
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        "version": None
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    }
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)
Parameters
function_nameRequiredstr

Name of the function the run token is for.

payloadRequireddict

Payload for the function.

optionsdict

Additional options for running the function.

Response

Function runs will return a JSON object containing a Function Run ID and the result from your Function in the following format:

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{
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  "result": {
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    "message": "Hello from a Function! It seems you have 14 letters in your name",
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    "name": "ev:RFVC:TTLHY04oVJlBuvPx:A7MeNriTKFES0Djl9uKaPvHCAn9PjSfOHu7tswXFCHF9:jwYKE13o3iQlr6Dn/DRk80XpNOGb:$"
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  },
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  "runId": "09413338da56",
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  "appUuid": "app_dfda72e016b1"
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}

evervault.create_run_token(function_name, data)

Creates a single use, time bound token (5 minutes) for invoking an Evervault Function with a given payload. Run Tokens can be used to invoke an Evervault Function client-side without providing a sensitive API Key.

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import evervault
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evervault.init(app_id="<APP_ID>", api_key="<API_KEY>")
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result = evervault.create_run_token(
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    "hello-function",
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    {
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        "name": "Claude Shannon",
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        "ssn": "ev:encrypted_string"
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    }
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)
Parameters
function_nameRequiredstr

Name of the function the run token is for.

datadict

Payload that the token can be used with. If not provided, a run token will be created, and the payload will not be validated when the function is executed.

evervault.create_client_side_decrypt_token(payload, expiry)

Client Side Decyrpt Tokens are versatile and short-lived tokens that frontend applications can utilise to decrypt data previously encrypted through Evervault. Client Side Decrypt Tokens are restricted to specific payloads.

By default, a Client Side Decrypt Token will live for 5 minutes into the future. The maximum time to live of the token is 10 minutes into the future.

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from datetime import datetime, timedelta
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import evervault
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evervault.init(app_id="<APP_ID>", api_key="<API_KEY>")
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encrypted = evervault.encrypt("Hello, world!")
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now = datetime.now()
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time_in_five_minutes = now + timedelta(minutes=5)
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token = evervault.create_client_side_decrypt_token(encrypted_data, time_in_five_minutes)
Parameters
payloadRequiredstr | list | dict | bytes | bytearray

The payload containing encrypted data that the token will be used to decrypt.

expirydatetime

The time the token will expire. Defaults to 5 minutes in the future.

Response

When you create a Run Token, the SDK will return a JSON object containing your token.

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{
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  "token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsInZlciI6IjAuMCJ9.eyJhcHBVdWlkIjoiYXBwX2RmZGE3MmUwMTZiMCIsImZ1bmN0aW9uTmFtZSI6ImhlbGxvLWNhZ2UtdGFsbC13YWxscy10cmF2ZWwiLCJydW5JZCI6IjRiMjhmMzNlLWU3NjYtNDI2OC1iNmY2LTUyYzZkM2VmMGQzYyIsImV4cCI6MTY2Nzg3Njc2Nn0.gCiFw7UJ8gjZfeXNEaqX4H1Y9HBX9avjioZ4yDU8PTtmGT4QTzVOhnDV46v_yyXLxpO1BgzoBRpYbLciiW1_QXSLmx6cCuJy4vHUZwssHT13vB7AXIl_88Ab5R7w9vpOQIDoCjhPVWJsolwUiiGh_5yE4wGv6WPTIfSv249_hpJLMz3AAffXUckiLPxFporY73KXtTANQH_zniivB91KdBnyGhle7gTs1EXWLqpdMIrqOz9cmoXU31DGd-AgeMzM082s_XtdCFq7FNLLtg6Nx8Mx8Bjl0cKV41R-jbTpHSXxutLX-PSDmWn5wSqDhlQoEWdTLsoS6xp7qhZ2urYyYg"
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}

Run Tokens can then be used to authenticate Function runs from the client-side.

lovelace:~$
curl -X POST https://run.evervault.com/hello-function \
     -H 'Authorization: Bearer eyJ..Tg' \
     -H 'Content-Type: application/json' \
     --data '{"name": "Claude Shannon", "ssn": "ev:encrypted_string"}'

evervault.enable_outbound_relay(options)

Configures your application to proxy HTTP requests using Outbound Relay based on the configuration created in the Evervault dashboard. See Outbound Relay to learn more.

Asynchronous HTTP requests are supported with aiohttp. Pass in a aiohttp.ClientSession to enable them for that session.

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evervault.enable_outbound_relay()
Parameters
decryption_domainsstr[]

Requests sent to any of the domains listed will be proxied through Outbound Relay. This will override the configuration created using the Evervault dashboard.

debug_requestsbool

Output request domains and whether they were sent through Outbound Relay.

client_sessionaiohttp.ClientSession

The aiohttp client session to enable outbound relay on. Requires Python 3.11+.

evervault.cage_requests_session(cage_attestation_data)

Returns a Requests session with will attest your Cage during the TLS handshake.

By default the client will attest the Cage using the attestation document but will not make any assertions about the values of the PCRs. The attestation can be further scoped to the software running in your enclave by passing a dict mapping Cage names to their corresponding PCRs.

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# assert that the Cage was signed with a known cert
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attested_session = evervault.cage_requests_session({ 
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  'my-cage': { 'pcr_8': '606e2c1cae65ee569799803388d2ca285ad5c325f9d7c0d4a38b3aa30bd729ba96a9a13e64577a622a0a1f050f722123' } 
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})
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attested_session.post(
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  'https://my-cage.my-app.cages.evervault.com', 
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  data=sensitive_payload
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)
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evervault.cage_requests_session()
Parameters
cage_attestation_data

Optional constraints to assert that the PCRs present in the Cage's attestation doc match the expected values. This can be either a single dict, or a list of dicts to allow roll-over between different sets of PCRs.