How can I generate a private and public key with OpenSSL using Git Bash?

[Gilliard Santos]

 Hello Git Community, how are you? 

- The Git Bash Terminal Installer includes OpenSSL, and my OpenSSL version is 3.1.4 (24 Oct 2023) (Library: OpenSSL 3.1.4 24 Oct 2023).

- How can I generate a public or private key using Git Bash?

Thank you all.

[Gilliard Santos]

[Johannes Schindelin]

Hi,

This does not seem to be a Git question at all. And the web has a lot of
answers for this question, e.g
https://stackoverflow.com/a/44474607/1860823:

You can generate a public-private keypair with the genrsa context (the
last number is the keylength in bits):

openssl genrsa -out keypair.pem 2048

To extract the public part, use the rsa context:

openssl rsa -in keypair.pem -pubout -out publickey.crt

Finally, convert the original keypair to PKCS#8 format with the pkcs8
context:

openssl pkcs8 -topk8 -inform PEM -outform PEM -nocrypt -in keypair.pem -out pkcs8.key

Ciao,
Johannes

On Fri, 23 Feb 2024, Gilliard Santos wrote:

> [image: 😀] Hello Git Community, how are you? [image: 😀]
>
> - The Git Bash Terminal Installer includes OpenSSL, and my OpenSSL version

> is *3.1.4 (24 Oct 2023) (Library: OpenSSL 3.1.4 24 Oct 2023)*.

>
> - How can I generate a public or private key using Git Bash?
>
> Thank you all.
>

> --
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>

[Konstantin Khomoutov]

On Fri, Feb 23, 2024 at 07:31:16AM -0800, Gilliard Santos wrote:

[...]

> - How can I generate a public or private key using Git Bash?

[...]

> This does not seem to be a Git question at all. And the web has a lot of
> answers for this question, e.g
> https://stackoverflow.com/a/44474607/1860823:
>
> You can generate a public-private keypair with the genrsa context (the
> last number is the keylength in bits):
>
> openssl genrsa -out keypair.pem 2048

[...]

To add to the Johannes' response, you might have also meant generating a pair
of SSH keys. If yes, you need the ssh-keygen tool (shipped with GfW); you
might consult, for instance, this doc [1] for details. Or, some GUI tools
can do that, such as puttygen from PuTTY [2].

1. https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent
2. https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html