react-native-themis - Sealed encryption crashes for empty string

[tom-at-pixel]

Describe the bug When secureCellSealWithSymmetricKeyEncrypt64() is called on an empty string, a native exception is thrown. If this is by design, it should be documented. Themis should consider handling this condition internally, since empty fields are a common occurrence for field-level encryption scenarios (e.g. imagine a user creating a to-do with an empty description field, and all user content-generated fields are encrypted).

To Reproduce Steps to reproduce the behavior:

1. In a React Native project with react-native-themis installed, run the following code:

const key = "ANY_BYTE_ARRAY";
const emptyText = "";

// This code will throw a native exception
await secureCellSealWithSymmetricKeyEncrypt64(key, emptyText);

2. Observe the exception:

Expected behavior The encryption should no-op in Themis for empty strings.

Environment (please complete the following information):

• OS: iOS 15.2
• Hardware: iOS Simulator
• Themis version: react-native-themis 0.14.4
• Installation way:
  • [x] via package manager
  • [ ] built from source

[vixentael]

Thank you, @tom-at-pixel! We'll take a look.

[vixentael]

i guess it's fixed in the latest release 0.14.7 https://github.com/cossacklabs/themis/releases/tag/0.14.7

@tom-at-pixel please take a look

[tom-at-pixel]

Thanks @vixentael, that's great!