Server certificate (public key) Intermediate CA and/or bundles that chain to the Trusted Root CA (Self-signed) Sign the certificate with openssl: openssl x509 -req -days 730 -in server.csr -signkey server.key -out server.crt Note: Increase or decrease 730 as needed. This is the number of days the certificate … Generating a Self-Singed Certificates. Use the following command to create the certificate: openssl x509 -req -in fabrikam.csr -CA contoso.crt -CAkey contoso.key -CAcreateserial -out fabrikam.crt -days 365 -sha256 Verify the newly created certificate openssl x509 -req -in TEST.csr -CA intermediate.crt -CAkey privkey.key -CAcreateserial -out TEST.crt -sha256 As per the man page of x509v3_config , signing of the TEST.csr should fail as it is not the end user certificate. Generate certificate signing request (CSR) with the key. Every example I come across online uses a .cnf file that is passed as an argument. Where -x509toreq is specified that we are using the x509 certificate files to make a CSR. Sign the CSR with intermediate.crt which should not be possible. We will be generating a CSR using OpenSSL. If you are using a UNIX variant like Linux or macOS, OpenSSL is probably already installed on your computer. openssl req -new -newkey rsa:2048 -nodes -out request.csr -keyout private.key. OpenSSL is a very useful open-source command-line toolkit for working with X.509 certificates, certificate signing requests (CSRs), and cryptographic keys. The attribute - new means this is a new request. Generate CSR (Interactive) Here,-newkey: This option creates a new certificate request and a new private key. Your P12 file can contain a maximum of 10 intermediate certificates. You can generate the certificate signing request with an interactive prompt or by providing the extra certificate information in the … Using the private key generated in the previous step, we need to create a certificate signing request. I am trying to sign a CSR provided by an end-user entity and I have the private key and certificate of the intermediate CA. Your P12 file must contain the private key, the public certificate from the Certificate Authority, and all intermediate certificates used for signing. $ openssl x509 in domain.crt-signkey domain.key -x509toreq -out domain.csr. The openssl req generates a certificate or a certificate signing request (CSR). The next most common use case of OpenSSL is to create certificate signing requests for requesting a certificate from a certificate authority that is trusted. Sign the intermediate1 CSR with the Root CA: openssl ca -batch -config ca.conf -notext -in intermediate1.csr … OpenSSL is a widely-used tool for working with CSR files and SSL certificates and is available for download on the official OpenSSL … Similar to the previous command to generate a self-signed certificate, this command generates a CSR. Snippet output from my terminal for this command. The -x509 means that it is to be generated a certificate … Make sure the subject (CN) of the intermediate is different from the root. Generate the certificate with the CSR and the key and sign it with the CA's root key. How to generate a certificate signing request solely depends on the platform you’re using and the particular tool of choice. Using the private key generate Certificate Signing Request (CSR) Have the CSR signed by a private or public Certificate Authority which will provide the certificate; Upload the private key and signed certificate to your device or system. 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