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rocketsquirreldev
rocketsquirreldev

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Stop Googling openssl commands: Auto-generate CLI codes

#webdev #security #productivity #tools

If you've ever had to manually set up a complete X.509 certificate chain (Root CA → Intermediate CA → Leaf) for your server, you know the pain. Staring at a black terminal, trying to remember the exact syntax for openssl, and figuring out the correct order to bundle them is frustrating.

I recently built x509Lab, a fully browser-based GUI tool to visualize and verify certificate chains. While visualizing is great, I realized users still had to manually type commands in their terminal to actually generate those certificates.

So, I added a new feature: GUI to CLI auto-generation.

1. Build your tree visually

First, you drag and drop nodes on the canvas to build your desired certificate hierarchy. Once your structure is ready, simply click the </> (Code) button on the left sidebar.

2. Copy the generated openssl commands

x509Lab analyzes your visual tree and automatically generates the exact openssl CLI commands needed to recreate that setup on your actual server.

The commands are strictly ordered for each node:

  1. Key Generation: (openssl genrsa or openssl ecparam)
  2. Certificate Signing: (openssl req -x509 or openssl x509 -req using the parent's key)
  3. Chain Bundling: (cat ... > chain.pem)
  4. Verification: (openssl verify)

The best part? It automatically reflects the cryptographic algorithms you selected in the GUI. Whether you chose RSA-2048, RSA-4096, ECDSA P-256, or ECDSA P-384, the parameters are instantly updated in the command block.

3. Paste directly into your terminal

Every section has a convenient Copy button. Just click, paste it directly into your terminal, and watch your certificates generate without a single typo.

Try it out!

If you deal with SSL/TLS certificates, mTLS, or internal PKI setups, I hope this tool saves you from hours of terminal headaches. It's 100% free, requires no login, and all parsing happens locally in your browser.

🔗 Link: https://x509lab.vercel.app

Let me know what you think in the comments, or if there are any specific openssl flags you'd like to see added in the next update!

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