https://github.com/mkontani/cert-tool-extension

https://github.com/mkontani/cert-tool-extension

chrome-extension cryptography

Last synced: 5 months ago
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• Host: GitHub
• URL: https://github.com/mkontani/cert-tool-extension
• Owner: mkontani
• Created: 2026-01-03T13:15:49.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2026-01-05T19:18:44.000Z (6 months ago)
• Last Synced: 2026-01-13T19:42:11.887Z (5 months ago)
• Topics: chrome-extension, cryptography
• Language: TypeScript
• Homepage: https://mkontani.github.io/cert-tool-extension/
• Size: 1.72 MB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Cert Tool Chrome Extension

![Cert Tool Icon](public/icons/icon128.png)

A powerful and elegant Chrome extension for handling X.509 certificates and cryptographic keys. Designed with a premium dark-mode interface and glassmorphism aesthetics.

[![Chrome Web Store](https://img.shields.io/badge/Chrome_Web_Store-Available-blue?logo=google-chrome&logoColor=white)](https://chromewebstore.google.com/detail/cert-tool/ojgmjpfknnlfcfjcljkdcfpbpgciefkk)

## Features

### 1. Key Pair Generation

Generate cryptographic key pairs instantly using the Web Crypto API.

![Key Pair Generation](screenshots/gen_keypair_screenshot_web.jpg)

- **Algorithms**: RSA (2048, 4096 bits), ECDSA (P-256, P-384, P-521), and Ed25519.

- **Standard Formats**: Private keys are exported in **PKCS#8** and public keys in **SPKI**.

- **Save As**: Easily download keys with a standard OS save dialog.

### 2. CSR Generation

Create Certificate Signing Requests (CSR) with a user-friendly form.

![CSR Generation](screenshots/gen_csr_screenshot_web.jpg)

- **Customizable DN**: Set Common Name, Organization, Country, and more.

- **SAN Support**: Add multiple Subject Alternative Names (DNS, IP, Email, URI).

- **Flexible Signing**: Sign the request using your own private key.

### 3. Public Key Derivation

Extract the public key component from various sources.

![Public Key Derivation](screenshots/derive_pubkey_screenshot_web.jpg)

- **Input Types**: Supports Private Keys (PKCS#8/PKCS#1), Certificates, or CSRs.

- **Auto-Detection**: Automatically identifies the input type and algorithm.

### 4. Certificate/CSR Inspector

View detailed information about certificates and signing requests.

![Inspector](screenshots/inspector_screenshot_web.jpg)

- **Comprehensive View**: Shows Serial Number, Subject, Issuer, Validity, and Public Key details.

- **Extension Decoding**: Human-readable decoding for SANs, Basic Constraints, Key Usage, and Extended Key Usage (EKU).

## Installation

1. Clone this repository.

2. Run `npm install` to install dependencies.

3. Run `npm run build` to generate the production build in the `dist` folder.

4. Open Chrome and navigate to `chrome://extensions`.

5. Enable "Developer mode" (top right).

6. Click "Load unpacked" and select the `dist` directory.

## Technology Stack

- **Framework**: Vite + React + TypeScript

- **Crypto Library**: [node-forge](https://github.com/digitalbazaar/forge) & Web Crypto API

- **Icons**: [Lucide React](https://lucide.dev/)

- **Styling**: Vanilla CSS with Glassmorphism effects

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Developed with focus on security, usability, and modern aesthetics.