Openssl asn1parse -in a. openssl rsa -in a.key -text -noout # key bits & primes used, prompts if encrypted Simple steps to generate CSR using openssl with examples Steps involved to configure SSL Create the certificate signing request (CSR). Configuration file(s) may have played a role in the commands, because not all options were used on the command line. Or in one step, create a new 3DES encrypted RSA key + CSR: openssl req -newkey rsa:2048 -keyout a.key -out a.csrĬonfirm what was created by the above commands. Then, as above, use it to create a new CSR. If you just came here for commands to generate a CSR: openssl genrsa -out DOMAIN.key 2048 openssl req -new -sha256. : openssl genpkey -aes-128-cbc -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out a.key To create a new -aes-128-cbc encrypted key: The first step in requesting an SSL certificate for your Apache based Web server, is to generate a Certificate Signing Request (CSR) using an OpenSSL. Also, encryption with AES128 was preferable to 3DES, for both security and performance. Genrsa was deprecated replaced by genpkey. Update for openssl version 3.0 (circa 2022) We still have the CSR information prompt, of course. This command will create a temporary CSR. We can create a self-signed certificate with just a private key: openssl req -key domain.key -new -x509 -days 365 -out domain.crt. So the usual scenario when creating a CSR is to create a new private key. The -days option specifies the number of days that the certificate will be valid. Key creation is easy and low cost, and newer keys may be more secure. It should be stated that creating a CSR from an existing key is not typical. Option -new refers to the CSR: openssl req -key a.key -new -out a.csr After the password prompt, depending on the openssl configuration file, you may be prompted to specify the distinguished name (DN) of the future certificate. Here we will learn about, how to generate a CSR for which you have the private key. When using a key, like when creating a certificate signing request (CSR), if the key was encrypted expect to be prompted for the password.Ĭreate a CSR from an existing encrypted private -key. A password protected key means the private key was encrypted.
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