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Data Definitions.md

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Data Definition

This file explains how password data is managed and stored on disk.

Data on Disk

Password data is stored on disk as encrypted JSON. It's encrypted using ChaCha20-Poly1305 authenticated encryption. We are using libsodium library for encrypting the file. JSON with passwords get encrypted and saved on disk as JSON:

{
  "timestamp": 1493189805,
  "version": 0,
  "data": "encrypted wallet"
}
  • timestamp is a unix timestamp set to when the wallet was saved. It is used for merging 2 wallets, which is for now done by just taking the newer wallet.
  • version represents version wallet, for backwards compaibility
  • data is the actual wallet itself (encrypted)

JSON Format

We are using JSON because it is flexible and allows us for future extensions. Unencrypted JSON never gets written to disk and only stayes in RAM. Here is an example of a JSON file:

{
  "items": {
    "fed8f5d6744128839ed7390f84268a78": {
      "last_edited": 1493189705,
      "name": "Google",
      "fields": [
        {
          "name": "Username",
          "type": "username",
          "value": "open_user",
          "sensitive": false
        },
        {
          "name": "Password",
          "type": "password",
          "value": "secret_pa55",
          "sensitive": true
        }
      ]
    },
    "f26cfe5b0596bb5077db7f7c0e19d9e5": {
      "last_edited": 1493189650,
      "name": "Firefox",
      "fields": [
        {
          "name": "E-mail",
          "type": "email",
          "value": "[email protected]",
          "sensitive": false
        },
        {
          "name": "Password",
          "type": "password",
          "value": "reallynotsecurepass123",
          "sensitive": true
        }
      ]
    }
  }
}

Items is dictionary of passwords that user has stored. Item's key is an UUID. Each item has a name field which is a display name for the field and fields attribute which is an array of fields for the entry. Each field has 3 properties:

  • name represents a display name, that is shown to the user
  • type represents a field type. Types are explained in the next section of this document
  • value represents the data that is stored in this field (for instance: the password itself)
  • sensitive is a boolean that marks if the field's value should be hidden and only displayed with dots, unless the user explicitly requests to see the value

Types

Type of the field is used to enhance the user experiance. It will probably not be used by the core library, but the applications will use it to show additional information to the user.

Currently possible types are:

  • username for storing usernames
  • password for storing passwords
  • email for storing email addresses
  • url for storing on which webpage the password entry is used
  • pin for storing numeric values only
  • date for storing dates
  • other for storing other than what is listed above