A secure CLI tool for encrypting and sharing git diffs and source files using client-side AES-256-GCM encryption.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install diff4
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install diff4 using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is diff4?
diff4 is a high-security utility designed for developers who need to share code changes and files without compromising privacy. As a specialized addition to the Openclaw Skills ecosystem, it ensures that your sensitive code never reaches a server in plaintext. By utilizing AES-256-GCM encryption on the client side, diff4 guarantees that only recipients with the correct out-of-band passphrase can decrypt and view the shared content.
Whether you are performing a quick code review or sending snippets across a distributed team, diff4 provides a seamless bridge between local development and secure cloud-based previews. It integrates perfectly with existing git workflows, making it an essential component for teams prioritizing security within their Openclaw Skills toolkit.
diff4 Use Cases
- Securely sharing the most recent git commit with a peer for immediate review.
- Previewing staged changes to ensure code quality before pushing to a remote repository.
- Bundling and transmitting multiple arbitrary text files across teams with end-to-end encryption.
- Managing self-hosted encryption servers for internal corporate compliance.
How diff4 Works
- The user initiates a command to capture a git diff or specific file contents.
- diff4 captures the data and performs client-side encryption using a pre-configured passphrase and the AES-256-GCM algorithm.
- The encrypted payload is uploaded to the designated diff4 server (default or self-hosted).
- The server generates a unique URL for the encrypted bundle.
- The user shares the URL and provides the decryption passphrase to the recipient via a secure, out-of-band channel.
diff4 Setup
To integrate this into your Openclaw Skills environment, ensure you have Node.js installed, then run:
npm i -g @diff4/cli
Initialize your encryption key:
diff4 key-gen [your-secret-passphrase]
Verify your configuration:
diff4 key-get
diff4 Data Schema & Taxonomy
diff4 organizes data into encrypted bundles. When sharing multiple files, it uses a specific JSON structure before encryption:
| Data Component | Description |
|---|---|
| Diff Payload | Standard git diff output (UTF-8 text). |
| File Bundle | A JSON array containing file paths and their corresponding text content. |
| Metadata | Includes versioning and encryption headers required for GCM decryption. |
| Server URL | Defaults to [https://diff4.com](https://diff4.com) unless overridden by DIFF4_SERVER env var. |
diff4 Advanced Features
- Support for self-hosted instances to maintain total control over the data lifecycle.
- Environment variable integration for
DIFF4_PASSPHRASEandDIFF4_SERVERfor automated CI/CD workflows. - Multi-path file bundling allowing for complex code snippet sharing in a single encrypted link.
- Graceful error handling for empty diffs or unsupported binary formats to maintain stable Openclaw Skills automation.
SKILL.md
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