Silent macOS Keychain Decrypter

I need a standalone native macOS executable that can run quietly in the background, accept the current user’s password programmatically, decrypt the entire login-keychain-db on any macOS build—including the latest 26.4 releases and future updates—and write the fully decrypted content to disk as a single JSON file. The process must remain completely invisible to the user: no dialogs, no terminal output, no GUI flashes.

When something goes wrong the binary should simply record the issue to an internal log file and continue running or exit gracefully; it must never surface an alert or prompt. I will supply the destination path for both the JSON output and the silent log at runtime.

Deliverables
• A universal (Intel + Apple Silicon) command-line binary built with Xcode/clang
• Source code with clear build instructions
• A short README describing any entitlements or signing requirements

Acceptance criteria
• Decrypts login.keychain-db on macOS versions 10.15 through 26.4+ without user interaction
• Outputs a valid, human-readable JSON file matching the original database contents
• Runs as a background process, leaves no visible trace, and logs errors silently only