Generate the self-signed root CA certificate: openssl req -x509 -sha256 -new -nodes -key rootCAKey.pem -days 3650 -out rootCACert.pem In this example, the validity period is 3650 days. SourceForge OpenSSL for Windows. The openssl ca command and utility is a lightweight piece of software that can be used to perform minimal CA (Certification Authority) functions. Generate certificates. Since this is meant for Dev and Lab use cases, we are generating a Self-Signed certificate. Created CA certificate/key pair will be valid for 10 years (3650 days). Now we need to copy the serial file over, for certificate serial numbers:copy d:\openssl-win32\bin\pem\democa\serial d:\openssl-win32\bin\democa Lastly, we need an empty index.txt file. Create a certificate signing request. We can use this to build our own CA (Certificate Authority). If you have a CA certificate that you can use to sign personal certificates, skip this step. Copy openssl_csr_san.cnf to /root/ca/intermediate, edit it and change the entries under [alt_names] so that the DNS. You can do this however you wish, but an easy way is via notepad & cli: notepad d:\openssl-win32\bin\demoCA\index.txt It will prompt you that it doesn’t exist and needs to create it. We will make this request for a fictional server called sammy-server , as opposed to creating a certificate that is used to identify a user or another CA. OpenSSL version 1.1.0 for Windows. OpenSSL is a free, open-source library that you can use to create digital certificates. openssl genrsa -des3 -out ca.key 4096 openssl req -new -x509 -days 3650 -key ca.key -out ca.crt During the process you will have to fill few entries (Common Name (CN), Organization, State or province .. etc). OpenSSL Operating a CA with openssl ca The first step - create Root key and certificate. Generate the client key: Execute: openssl genrsa -out "client.key" 4096 Generate CSR: Execute: In the following commands, I’ll be using the root certificate (root-ca) created in my previous post! The very first cryptographic pair we’ll create is the root pair. They will be used more and more. Because the idea is to sign the child certificate by root and get a correct certificate In this example, the certificate of the Certificate Authority has a validity period of 3 years. This certificate may only be used to sign other certificates (this is defined in the extension file in the section ca). At the command prompt, enter the following command: openssl. This tutorial should be used only on development and/or test environments! You must update OpenSSL to generate a widely-compatible certificate" The first OpenSSL command generates a 2048-bit (recommended) RSA private key. * entries match the Fully Qualified Domain Name of the server you wish to create a certificate for. For more specifics on creating the request, refer to OpenSSL req commands. Conclusion. Create your own Certificate Authority and sign a certificate with Root CA; Create SAN certificate to use the same certificate across multiple clients . Use this method if you want to use HTTPS (HTTP over TLS) to secure your Apache HTTP or Nginx web server, and you do not require that your certificate is signed by a CA. Create the certificate request and private key: openssl req -newkey rsa:2048 -keyout xenserver1prvkey.pem -nodes -out server1.req -config req.conf . openssl req -new -newkey rsa:2048 -nodes -out request.csr -keyout private.key. The command can sign and issue new certificates including self-signed Root CA certificates, generate CRLs (Certificate Revocation Lists), and other CA things. For production use there will be a certificate authority (CA) who is responsible for signing the certificate to be trusted in the internet. June 2017. Facebook Twitter 2 Gmail 2 LinkedIn 2 SSL certificates are cool. Where -x509toreq is specified that we are using the x509 certificate files to make a CSR. [root@localhost ~]# openssl req -new -key ca.key -out ca.csr You are about to be asked to enter information that will be incorporated into your certificate request. Generate a ca.key with 2048bit: openssl genrsa -out ca.key 2048 According to the ca.key generate a ca.crt (use -days to set the certificate effective time): openssl req -x509 -new -nodes -key ca.key -subj "/CN=${MASTER_IP}" -days 10000 -out ca.crt Generate a server.key with 2048bit: Creating OpenSSL x509 certificates. For a production environment please use the already trusted Certificate Authorities (CAs). Important: if you want your CA certificate to work on Android properly, then add the following options when generating CA: openssl req -x509 -new -nodes -key myCA.key -sha256 -days 1825 -out myCA.pem -reqexts v3_req -extensions v3_ca Acting as a certificate authority (CA) means dealing with cryptographic pairs of private keys and public certificates. This key & certificate will be used to sign other self signed certificates. This creates a password protected key. Well, there’s a third option, one where you can create a private certificate authority, and setting it up is absolutely free. Generate OpenSSL Self-Signed Certificate with Ansible. Here is a link to additional resources if you wish to learn more about this. Create a root CA certificate. Step 1.2 - Generate the Certificate Authority Certificate. The second command generates a Certificate Signing Request, which you could instead use to generate a CA-signed certificate. 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