Option 2: Generate a CSR for an Existing Private Key It is recommended to issue a new private key whenever you are generating a CSR. I see a lot of websites saying that the CSR is encrypted, but that does not seem to be true. Note: it is seen as somewhat of a risk to re-use the same key over very long periods of time. I am using the following command in order to generate a CSR together with a private key by using OpenSSL:. The generator lists your existing CSRs, if you have any, organized by domain name. Create CSR using an existing private key openssl req –out certificate.csr –key existing.key –new. openssl req -out CSR.csr-key privateKey.key –new (4) Create CSR based on an existing certificate. Note: A certificate signing request generated with OpenSSL will always have the .csr file format. Remember that you must need a private key before creating your CSR. Enter the following information, which will be associated with the CSR: Check contents of PKCS12 format cert openssl … (3) Create CSR based on an existing private key. Use this method if you already have a private key that you would like to use to request a certificate from a CA. [root@centos8-1 certs]# openssl req -new -key server.key.pem -out server.csr You are about to be asked to enter information that will be incorporated into your certificate request. Create CSR and Key Without Prompt using OpenSSL. In the right-hand Managing Your Server section under Help me with, click Generate a CSR. Now to create SAN certificate we must generate a new CSR i.e. openssl x509 -x509toreq -in certificate.crt-out CSR.csr-signkey privateKey.key (5) Passphrase removal from a private key. The complete procedures you need to follow: Create a certificate signing request with … Generate a CSR. openssl req -new -subj "/CN=sample.myhost.com" -out newcsr.csr -nodes -sha512 … This command creates a new CSR (domain.csr) based on an existing private key (domain.key): openssl req \ -key domain.key \ -new -out domain.csr Use the following command to create a new private key 2048 bits in size example.key and generate CSR example.csr from it: Click the name of the server for which you want to generate a CSR. openssl x509 -x509toreq-in existing.crt -signkey existing.key -out new.csr This uses the all the certificate meta-information and the existing key from the existing certificate to create a new CSR.The new CSR must be sent to the new provider. openssl rsa -in privateKey.pem-out newPrivateKey.pem . Both examples show how to create CSR using OpenSSL non-interactively (without being prompted for subject), so you can use them in any shell scripts. If you don’t want to create a new private key instead of using an existing one, you can go with the above command. Click Create CSR. Scenario: for example, you have a certificate called apache.crt which has been expired and you want to renew it for the next 365 days. Apr 01, 2020 Generate a certificate signing request (CSR) for an existing private key openssl req -out CSR.csr -key private.key -new Generate a multi-domain SSL certificate signing request (CSR) for an existing private key. openssl req -out CSR.csr-key privateKey.key-new; Generate a certificate signing request based on an existing certificate openssl x509 -x509toreq -in certificate.crt-out CSR.csr-signkey privateKey.key; Remove a passphrase from a private key openssl rsa -in privateKey.pem-out newPrivateKey.pem; Checking Using OpenSSL. How to create a new CSR with existing private key and cert. Generate a CSR from an Existing Private Key. 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