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How-to: Make Your Own Cert With Web OpenSSL

published on 2023-02-17 00:00:00 UTC by Didier Stevens
Content:

I explain how to create certificates with OpenSSL on your Windows computer in my blog post “How-to: Make Your Own Cert With OpenSSL on Windows (Reloaded)“.

If you can’t or don’t want to install OpenSSL, there is a solution now with Web OpenSSL.

With Web OpenSSL, you can just run OpenSSL and the commands in your browser, like this (for more info on these commands , read my blog post).

Go to Web OpenSSL:

Scroll down a bit:

Click “Enter split screen”. You will now have a command-line interface to the left and the folder with files to the right:

Enter this command:

openssl genrsa -out ca.key 4096

Notice that 2 files have been created. You can take a look at them, for example ca.key:

Enter this command and answer the questions:

openssl req -new -x509 -days 1826 -key ca.key -out ca.crt

Enter this command:

openssl genrsa -out ia.key 4096

Enter this command and answer the questions:

openssl req -new -key ia.key -out ia.csr

Create a text file named altname.cnf and enter your domain name, this is the content for my domain name: subjectAltName=DNS:www.didierstevens.com

Upload this file (button Browse in Files) and check it was properly uploaded:

Enter this command:

openssl x509 -req -days 730 -in ia.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out ia.crt -extfile altname.cnf

Enter this command:

openssl pkcs12 -export -out ia.p12 -inkey ia.key -in ia.crt -chain -CAfile ca.crt

You can then download all your files:

Verify and start using them:

If you want to understand what these commands exactly do, read my blog post “How-to: Make Your Own Cert With OpenSSL on Windows (Reloaded)“.

Article: How-to: Make Your Own Cert With Web OpenSSL - published almost 2 years ago.

https://blog.didierstevens.com/2023/02/17/how-to-make-your-own-cert-with-web-openssl/   
Published: 2023 02 17 00:00:00
Received: 2023 02 17 00:21:04
Feed: Didier Stevens
Source: Didier Stevens
Category: Cyber Security
Topic: Cyber Security
Views: 0

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