Openssl Generate Key From Cer

Openssl Generate Key From Cer 3,6/5 129 reviews

SSL certificates are cool. They will be used more and more. This tutorial should be used only on development and/or test environments!

Openssl Generate Private Key From Cer File
Openssl Generate Certificate
Openssl Generate Public Key From Certificate
Openssl Generate Private Key From Cer
Openssl Create Private Key From Certificate

See Example: SSL Certificate - Generate a Key and CSR. Tableau Server uses Apache, which includes OpenSSL. You can use the OpenSSL toolkit to generate a key file and Certificate Signing Request (CSR) which can then be used to obtain a signed SSL certificate. Steps to generate a key and CSR.

I have used openssl to create a.key and.cer file in pem format (you can read them). Now I want to create.pfx file from them. I have read openssl doumentation it says something like following command I can use. Openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer.
How to Generate a Self-Signed Certificate and Private Key using OpenSSL Generating a private key and self-signed certificate can be accomplished in a few simple steps using OpenSSL. We provide here detailed instructions on how to create a private key and self-signed certificate valid for 365 days.

For a production environment please use the already trusted Certificate Authorities (CAs).

This key & certificate will be used to sign other self signed certificates. That will be covered in another tutorial.

Openssl Generate Private Key From Cer File

here's a video:

Generate the CA key

You'll be prompted to enter a password.

openssl genrsa -des3 -out myCA.key 2048

Generate the Certificate

openssl req -x509 -new -nodes -key myCA.key -sha256 -days 3650 -out myCA.pem

3650 means that it will be valid for 10 years. Yes!

You can optionally remove the password from the key. For development purposes it would most likely be OK.

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Make a backup of the original key

Linux/Mac: cp myCA.key myCA.key.with_pwd
Windows: copy myCA.key myCA.key.with_pwd

Export the CA key without a password

This is useful so you don't have to keep track of the password and/or use a script to sign self-signed SSL certificates.

openssl rsa -in myCA.key.with_pwd -out myCA.key

Convert the CA certificate from .PEM to .CRT format

openssl x509 -outform der -in myCA.pem -out myCA.crt

You may get the following errors:

How to fix OpenSSL error unable to write random state.

To fix this use this in the command line.

Windows

set RANDFILE=.rnd

Linux/Mac

export RANDFILE=.rnd

Another OpenSSL WARNING: can't open config file: /apache24/conf/openssl.cnf

This is fixable by setting an ENV variable that points to this file. I have copied this from my current Apache installation.

If you don't have it download it from this gist: https://gist.github.com/lordspace/c2edd30b793e2ee32e5b751e8f977b41

Windows: set OPENSSL_CONF=openssl.cnf

Linux: export OPENSSL_CONF=openssl.cnf

Related

While Encrypting a File with a Password from the Command Line using OpenSSLis very useful in its own right, the real power of the OpenSSL library is itsability to support the use of public key cryptograph for encrypting orvalidating data in an unattended manner (where the password is not required toencrypt) is done with public keys.

The Commands to Run

Generate a 2048 bit RSA Key

You can generate a public and private RSA key pair like this:

Openssl Generate Certificate

openssl genrsa -des3 -out private.pem 2048

That generates a 2048-bit RSA key pair, encrypts them with a password you provideand writes them to a file. You need to next extract the public key file. You willuse this, for instance, on your web server to encrypt content so that it canonly be read with the private key.

Export the RSA Public Key to a File

This is a command that is

openssl rsa -in private.pem -outform PEM -pubout -out public.pem

The -pubout flag is really important. Be sure to include it.

Next open the public.pem and ensure that it starts with-----BEGIN PUBLIC KEY-----. This is how you know that this file is thepublic key of the pair and not a private key.

To check the file from the command line you can use the less command, like this:

less public.pem

Do Not Run This, it Exports the Private Key

A previous version of the post gave this example in error.

openssl rsa -in private.pem -out private_unencrypted.pem -outform PEM

The error is that the -pubout was dropped from the end of the command.That changes the meaning of the command from that of exporting the public keyto exporting the private key outside of its encrypted wrapper. Inspecting theoutput file, in this case private_unencrypted.pem clearly shows that the keyis a RSA private key as it starts with -----BEGIN RSA PRIVATE KEY-----.

Visually Inspect Your Key Files

It is important to visually inspect you private and public key files to makesure that they are what you expect. OpenSSL will clearly explain the nature ofthe key block with a -----BEGIN RSA PRIVATE KEY----- or -----BEGIN PUBLIC KEY-----.

You can use less to inspect each of your two files in turn:

less private.pem to verify that it starts with a -----BEGIN RSA PRIVATE KEY-----
less public.pem to verify that it starts with a -----BEGIN PUBLIC KEY-----

The next section shows a full example of what each key file should look like.

Openssl Generate Public Key From Certificate

The Generated Key Files

The generated files are base64-encoded encryption keys in plain text format.If you select a password for your private key, its file will be encrypted withyour password. Be sure to remember this password or the key pair becomes useless.

The private.pem file looks something like this:

The public key, public.pem, file looks like:

Protecting Your Keys

Depending on the nature of the information you will protect, it’s important tokeep the private key backed up and secret. The public key can be distributedanywhere or embedded in your web application scripts, such as in your PHP,Ruby, or other scripts. Again, backup your keys!

Remember, if the key goes away the data encrypted to it is gone. Keeping aprinted copy of the key material in a sealed envelope in a bank safety depositbox is a good way to protect important keys against loss due to fire or harddrive failure.

Oh, and one last thing.

If you, dear reader, were planning any funny business with the private key that I have just published here. Know that they were made especially for this series of blog posts. I do not use them for anything else.

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