v0.2.0

[0.2.0] - 2026-08-01

Added

• Rust core engine (rust_core) handling all cryptographic and platform logic:
  • ChaCha20-Poly1305 file encryption and decryption, both password-based
    and random-key based
  • Secure file deletion via multi-pass overwrite
  • Random key generation (URL-safe Base64, 32 bytes)
  • File format versioning and integrity verification
• C FFI layer exposing the core to the UI, with a typed error code for every
  failure scenario (I/O, invalid format, invalid password, output exists,
  invalid input, unsupported operation, etc.)
• Pre-flight path validation in Rust: missing input, directory input, missing
  output directory, wrong extension for decryption, same-path and overwrite
  protection — an existing output file is never touched
• Windows context-menu registration implemented in Rust (registry writes,
  command construction, frozen/development packaging detection)
• Test suite: 54 tests covering encryption roundtrips, tamper detection,
  wrong-password rejection, path-validation rules, and registry
  register/unregister
• Automated build pipeline: Rust release build → PyInstaller → Inno Setup

Changed

• The Python UI is now a thin wrapper over the Rust FFI; all crypto, registry
  and validation logic lives in the core
• Python exception mapping aligned with the FFI error codes
• Encrypted streams are flushed and synced to disk before the operation
  completes (data durability)
• Version bumped from 0.1.0 to 0.2.0 across the project

Fixed

• Windows context-menu registration compatibility with the winreg crate 0.52
• Wrong error class returned for a missing input file (I/O error →
  invalid input)
• Key generation contract: guaranteed null-terminated output, short buffers
  rejected with an explicit error
• Registry registration now verifies the target executable exists before
  writing any keys

Security

• Passwords and keys are zeroized in memory after use
• FFI functions are panic-guarded: a panic inside the core is converted into
  a typed error instead of crashing the process
• Overwrite protection enforced in the core: existing output files are
  never modified

OpenCrypt 0.2.1

[0.2.1] — 2026-08-01

Fixed

• Installer: PATH refresh reliability. The environment broadcast was
  sent manually via SendMessageTimeout; replaced with Inno Setup's
  native ChangesEnvironment=yes, which reliably notifies running
  applications after install and uninstall.
• Installer: PATH deduplication. EnvAddPath now checks the full
  path list before appending, so re-installs don't grow the PATH
  variable with duplicates.

Changed

• README: documented the headless opc CLI (usage, key auto-detection,
  exit codes, dev entry point in the venv).

v0.1.0

v1

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