Handle invalid ciphertext length

[JanKuczma]

No description provided.

[Copilot]

Pull Request Overview

This PR adds validation to prevent buffer underflow errors by checking ciphertext length before attempting to decrypt data. The change ensures that ciphertext has at least 45 bytes before attempting to extract the ephemeral public key (33 bytes) and initialization vector (12 bytes).

Key Changes

• Added length validation in both TypeScript and Rust decrypt functions
• Consistent error messaging across both implementations for invalid ciphertext length

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ts/lib/src/index.ts	Added ciphertext length validation with error throwing in TypeScript decrypt function
rust/lib/src/lib.rs	Added ciphertext length validation with Result error return in Rust decrypt function

Comments suppressed due to low confidence (1)

ts/lib/src/index.ts:199

• [nitpick] The error message format is inconsistent with the Rust implementation. Consider using a period after 'bytes' to match the Rust error message format: 'Invalid ciphertext length X bytes. Expected at least 45 bytes.'

      `Invalid ciphertext length ${ciphertextBytes.length} bytes, expected at least 45 bytes`