As of OpenSSL 1.1.1, providing subjectAltName directly on command line becomes much easier, with the introduction of the -addext flag to openssl req (via this commit).. 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 complained that mandatory Country Name field is missing and the generated certificate just had CN in the subject line. The openssl program is a command line tool for using the various cryptography functions of openssl's crypto library from the shell.. OpenSSL is a cryptography toolkit implementing the Transport Layer Security (TLS v1) network protocol, as well as related cryptography standards.. For detailed description and options of each command, see the man pages in our CS Unix machines using "man openssl" or "man ". openssl x509 -req -in req.pem -extfile openssl.cnf -extensions v3_usr \ -CA cacert.pem -CAkey key.pem -CAcreateserial Set a certificate to be trusted for SSL client use and change set its alias to "Steve's Class 1 CA" openssl x509 -in cert.pem -addtrust clientAuth \ -setalias "Steve's Class 1 CA" -out trust.pem NOTES. It can be used for [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. What you are about to enter is what is called a Distinguished Name or a DN. Further calls to OPENSSL_config() will have no effect. DESCRIPTION. The validity period is set on the CA under the configuration of the certificate template. OpenSSL also has an active GitHub repository with examples too. $ openssl genrsa -out example.com.key 4096 $ openssl req -new -sha256 -key example.com.key -out example.com.csr. You can create RSA key pairs (public/private) from PowerShell as well with OpenSSL. Any errors are ignored. 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 configuration file format is documented in the conf(5) manual page.. OPENSSL_no_config() disables configuration. 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 This can also be done in one step. 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. Check man req for more information. ... You can read more about the available options and view sample configurations in the man pages. Generating RSA Key Pairs. openssl req -x509 -newkey rsa:2048 -keyout key.pem -out req.pem. openssl req -new -out MyFirst.csr. 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. You request the certificate the CA determines the length the certificate will be valid. Tuesday April 17th, 2018 at 08:03 PM. The commit adds an example to the openssl req man page:. The openssl program is a command line tool for using the various cryptography functions of OpenSSL's crypto library from the shell. JD says: Reply. 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. $ openssl asn1parse