crypto — Generic cryptographic module — pyOpenSSL 19.1.0 5. Products derived from this software may not be called "OpenSSL" nor may "OpenSSL" appear in their names without prior written permission of the OpenSSL Project. 6. Redistributions of any form whatsoever must retain the following acknowledgment: "This product includes software developed by the OpenSSL Project OpenSSL: Check SSL Certificate Expiration Date and More Info: Run man s_client to see the all available options. As an example, let’s use the openssl to check the SSL certificate expiration date of the website: $ echo | openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -dates notBefore=Mar 18 10:55:00 2017 GMT notAfter=Jun 16 10:55:00 2017 GMT How to Setup your Own Certificate Authority (CA) using OpenSSL Nov 06, 2017 Built a certification authority for OpenVPN from the Hi, these are the steps to build your own CA (Certification Authority) and all requiered certificates for a OpenVPN instance (Client and Server) on Linux. Define your environment. Always set these variables in the shell before executing openssl commands. Adjust it to your needs. Initialise the CA Create a default openvpn config and alter the sections req_distinguished_nam

On 08/21/2017 09:20 AM, Salz, Rich via openssl-users wrote: > But in doing this, I can't figure out if there is a risk on serial > number size for a root CA cert as there is for any other cert. > > I don’t understand what attack you are concerned about, but the size of the serial number should not matter for *any* certificate. > This whole subject is tied into the substitution attack found

Each issued certificate must contain a unique serial number assigned by the CA. It must be unique for each certificate given by a given CA. OpenSSL keeps the used serial numbers on a file, by default it has the same name as the CA certificate file with the extension replace by srl. So a file named is created: $ cat ED4B4A80662B1B4C

OpenSSL: Check SSL Certificate Expiration Date and More

Installs Win32 OpenSSL v1.1.1g (Only install this if you need 32-bit OpenSSL for Windows. Note that this is a default build of OpenSSL and is subject to local and state laws. More information can be found in the legal agreement of the installation. Win64 OpenSSL v1.0.2u Light: 3MB Installer OpenSSL create certificate chain with Root & Intermediate