README.md

Android

Register and recover PIN-protected secrets on behalf of a particular user.

Install

Gradle

repositories {
  google()
  mavenCentral()
}

dependencies {
  implementation 'xyz.juicebox:sdk:0.3.2'
}

Maven

<dependency>
  <groupId>xyz.juicebox</groupId>
  <artifactId>sdk</artifactId>
  <version>0.3.2</version>
</dependency>

Usage

Instantiate a Client with the appropriate Realms you wish to communicate with.

The auth tokens should be acquired out-of-band from a server you run and specific to each realm id. All of the realms must be set up to accept this server's tokens. You can either provide a map of tokens that are valid for the lifetime of the client or implement the Client.fetchAuthTokenCallback to dynamically fetch tokens as necessary.

For maximum security, we recommend utilizing multiple realms with a register and recover threshold greater than 1.

import xyz.juicebox.sdk.*

val client = Client(
                Configuration(
                    // You should receive the realm parameters from your realm provider,
                    // or configure them yourself for your self-hosted realm.
                    """
                      {
                        "realms": [
                          {
                            "address": "https://juicebox.hsm.realm.address",
                            "id": "0102030405060708090a0b0c0d0e0f10",
                            "public_key": "0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20"
                          },
                          {
                            "address": "https://your.software.realm.address",
                            "id": "2102030405060708090a0b0c0d0e0f10"
                          },
                          {
                            "address": "https://juicebox.software.realm.address",
                            "id": "3102030405060708090a0b0c0d0e0f10"
                          }
                        ],
                        "register_threshold": 3,
                        "recover_threshold": 3,
                        "pin_hashing_mode": "Standard2019"
                      }
                    """
                ),
                authTokens = mapOf(
                  RealmId(string = "0102030405060708090a0b0c0d0e0f10") to authToken1,
                  RealmId(string = "2102030405060708090a0b0c0d0e0f10") to authToken2,
                  RealmId(string = "3102030405060708090a0b0c0d0e0f10") to authToken3
                )
            )

Once you've created a client, you can register a secret for the authToken's user by calling:

client.register("1234".toByteArray(), "secret".toByteArray(), "info".toByteArray(), 5)

To recover the secret you just registered, you can call:

val secret = String(client.recover("1234".toByteArray(), "info".toByteArray()))

And when you're ready to delete any secret from the remote store, simply call:

client.delete()