Check man req for more information. The validity period is set on the CA under the configuration of the certificate template. You request the certificate the CA determines the length the certificate will be valid. More information on creating RSA keys is available on the man page of genrsa, and more information on creating Certificate Signing Requests is available in the man page of req. The commit adds an example to the openssl req man page:. This can also be done in one step. OpenSSL also has an active GitHub repository with examples too. Here we only illustrate the use of the following OpenSSL commands: req -- The req command primarily creates and processes certificate requests in PKCS#10 format. ... You can read more about the available options and view sample configurations in the man pages. openssl req -new -out MyFirst.csr. You can create RSA key pairs (public/private) from PowerShell as well with OpenSSL. Generating RSA Key Pairs. Convert a certificate to a certificate request: openssl x509 -x509toreq -in cert.pem -out req.pem -signkey key.pem Convert a certificate request into a self signed certificate using extensions for a CA: openssl x509 -req -in careq.pem -extfile openssl.cnf -extensions v3_ca \ -signkey key.pem -out cacert.pem openssl complained that mandatory Country Name field is missing and the generated certificate just had CN in the subject line. put C, ST, L, O and OU in the openssl.cnf section req_distinguished_name and ; ran openssl req with -subj=/CN=www.mydom.com. The openssl program is a command line tool for using the various cryptography functions of OpenSSL's crypto library from the shell. Further calls to OPENSSL_config() will have no effect. OPENSSL_config() configures OpenSSL using the standard openssl.cnf configuration file name using config_name.If config_name is NULL then the default name openssl_conf will be used. $ openssl genrsa -out example.com.key 4096 $ openssl req -new -sha256 -key example.com.key -out example.com.csr. The configuration file format is documented in the conf(5) manual page.. OPENSSL_no_config() disables configuration. openssl req -x509 -newkey rsa:2048 -keyout key.pem -out req.pem. $ openssl asn1parse ". OpenSSL is a cryptography toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) network protocols and related cryptography standards required by them. [root@centos8-1 tls]# openssl req -new -x509 -days 3650 -passin file:mypass.enc -config openssl.cnf -extensions v3_ca -key private/cakey.pem -out certs/cacert.pem You are about to be asked to enter information that will be incorporated into your certificate request. 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