flejz/pinentry-win

pinentry-win is a small Windows program written in Rust that shows a password dialog box when GnuPG needs you to enter a passphrase. GnuPG is widely used for encrypting files and emails, and it relies on a separate program called pinentry to securely collect passwords from the user. The standard pinentry programs available for Windows tend to depend on heavy software like Qt or GTK, or require a Unix compatibility layer like Cygwin. This project replaces them with a lightweight alternative that uses Windows' own native dialog system directly. The program speaks the same communication protocol that GnuPG expects, so it works as a direct drop-in replacement with no changes needed on the GnuPG side. It supports the full set of commands that GnuPG sends to a pinentry program, including prompting for a PIN or passphrase, showing confirmation dialogs, and displaying informational messages. It clears the entered passphrase from memory immediately after use. The dialog is high-DPI aware and renders with modern button styles. To use it, download the prebuilt pinentry.exe from the Releases page and point GnuPG at it by editing one line in the GnuPG agent configuration file. You then restart the GnuPG agent and the new dialog appears the next time GnuPG needs a passphrase. Building from source requires the Rust toolchain and the MSVC compiler target for Windows. The license is MIT.