Using openssl, I've created a private key as follows: openssl genrsa -out myKey.pem Then, to generate the csr demanded by the CA, I've executed the following: openssl req -new -key myKey.pem -out cert.csr The CA responded with a certificate which I stored in a file named myCert.cer. Openssl genrsa -out./yourkeyfile.key 2048 and then use the file to create a CSR with. Openssl req -new -sha256 -key yourkeyfile.key -out yourcsrfile.csr If you use the one line command the keyfile is created in DER format. Openssl req -new -sha256 -newkey rsa:2048 -nodes -keyout yourkeyfile.key -out yourcsrfile.csr. Common OpenSSL Commands with Keys and Certificates. Generate RSA private key with certificate in a single command openssl req -x509 -newkey rsa:4096 -sha256 -keyout example.key -out example.crt -subj '/CN=example.com' -days 3650 -passout pass:foobar Generate Certificate Signing Request (CSR) from private key with passphrase.

Keys are the basis of public key algorithms and PKI. Keys usually come in pairs, with one half being the public key and the other half being the private key. With OpenSSL, the private key contains the public key information as well, so a public key doesn’t need to be generated separately.

Public keys come in several flavors, using different cryptographic algorithms. The most popular ones associated with certificates are RSA and DSA, and this article will show how to generate each of them.

Generating an RSA key

A RSA key can be used both for encryption and for signing and generating a key is quite easy, all you have to do is the following:

That will generate a private key with is password protected (it will prompt you for the password during generation). If you don’t want it password protected (usually for server side use) then leave the -des3 parameter out, i.e.:

The number 2048 is the size of the key, in bits. Today, 2048 or higher is recommended for RSA keys, as fewer amount of bits is considered insecure.

Generating a DSA key

A DSA key can be used for signing only. This is important to keep in mind to know what kind of purposes a certificate request with a DSA key can really be used for.

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Generating a key for the DSA algorithm is a two-step process. First, you have to generate parameters from which to generate the key then to generate the key itself.

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Again like RSA, 2048 is the size of the key, in bits with anything smaller than 2048 being insecure in todays standards.

Also the -des3 parameter will prompt you for a pass phrase – for server use leave it out:

Common OpenSSL Commands with Keys and Certificates

Generate RSA private key with certificate in a single command

Generate Certificate Signing Request (CSR) from private key with passphrase

Generate RSA private key (2048 bit)

Generate a Certificate Signing Request (CSR)

Generate RSA private key (2048 bit) and a Certificate Signing Request (CSR) with a single command

Convert private key to PEM format

Generate a self-signed certificate that is valid for a year with sha256 hash

View details of a RSA private key

Openssl Generate Key From Pem Word

View details of a CSR

Openssl Generate Key From Pem Key

From

View details of a Certificate

View details of a Certificate in DER format

Openssl Generate Key Pair Pem

Convert a DER file (.crt .cer .der) to PEM

Openssl Generate Key From Pem File

Convert a PEM file to DER