Openssl Command To Generate Private Key And Csr
Openssl genrsa -out rsa.private 1024 4. The private key is generated and saved in a file named 'rsa.private' located in the same folder. NOTE The number '1024' in the above command indicates the size of the private key. You can choose one of five sizes: 512, 758, 1024, 1536 or 2048 (these numbers represent bits). Below you’ll find two examples of creating CSR using OpenSSL. In the first example, i’ll show how to create both CSR and the new private key in one command. And in the second example, you’ll find how to generate CSR from the existing key (if you already have the private key and want to keep it). May 22, 2019 A Certificate Signing Request (CSR) is the first step in setting up an SSL Certificate on your website. SSL certificates are provided by Certificate Authorities (CA), which require a Certificate Signing Request (CSR). This guide will instruct you on how to generate a Certificate Signing Request using OpenSSL.
Deciding on Key Generation Options
When generating a key, you have to decide three things: the key algorithm, the key size, and whether to use a passphrase.
Key Algorithm
For the key algorithm, you need to take into account its compatibility. For this reason, we recommend you use RSA. However, if you have a specific need to use another algorithm (such as ECDSA), you can use that too, but be aware of the compatibility issues you might run into.
Note: This guide only covers generating keys using the RSA algorithm.
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Key Size
Openssl Gen Csr
For the key size, you need to select a bit length of at least 2048 when using RSA and 256 when using ECDSA; these are the smallest key sizes allowed for SSL certificates. Unless you need to use a larger key size, we recommend sticking with 2048 with RSA and 256 with ECDSA.
Note: In older versions of OpenSSL, if no key size is specified, the default key size of 512 is used. Any key size lower than 2048 is considered unsecure and should never be used.
Openssl Generate Private Key Csr
Passphrase
Private Key Encryption
For the passphrase, you need to decide whether you want to use one. If used, the private key will be encrypted using the specified encryption method, and it will be impossible to use without the passphrase. Because there are pros and cons with both options, it's important you understand the implications of using or not using a passphrase. In this guide, we will not be using a passphrase in our examples.