The attribute - new means this is a new request. You can generate the certificate signing request with an interactive prompt or by providing the extra certificate information in the … openssl req -new -newkey rsa:2048 -nodes -out request.csr -keyout private.key. 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. OpenSSL is a very useful open-source command-line toolkit for working with X.509 certificates, certificate signing requests (CSRs), and cryptographic keys. Sign the intermediate1 CSR with the Root CA: openssl ca -batch -config ca.conf -notext -in intermediate1.csr … 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. Make sure the subject (CN) of the intermediate is different from the root. We will be generating a CSR using OpenSSL. Using the private key generated in the previous step, we need to create a certificate signing request. API Connect supports only the P12 (PKCS12) format file for the present certificate. OpenSSL is a widely-used tool for working with CSR files and SSL certificates and is available for download on the official OpenSSL … Generate CSR (Interactive) Here,-newkey: This option creates a new certificate request and a new private key. 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. Generating a Self-Singed Certificates. Generate the certificate with the CSR and the key and sign it with the CA's root key. Your P12 file must contain the private key, the public certificate from the Certificate Authority, and all intermediate certificates used for signing. How to generate a certificate signing request solely depends on the platform you’re using and the particular tool of choice. Every example I come across online uses a .cnf file that is passed as an argument. 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. Snippet output from my terminal for this command. 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. This is the number of days the certificate … The openssl req generates a certificate or a certificate signing request (CSR). 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. Your P12 file can contain a maximum of 10 intermediate certificates. 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